ScStw/ESP32-HUB75-MatrixPanel-DMA
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Emil Muratov 2022-01-10 22:14:58 +03:00
commit 9cc68377bb
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25
CMakeLists.txt Normal file
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@ -0,0 +1,25 @@
# HUB75 RGB LED matrix library utilizing ESP32 DMA Engine
# https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA
# MIT License
cmake_minimum_required(VERSION 3.5)
idf_component_register(SRCS "esp32_i2s_parallel_dma.c" "ESP32-HUB75-MatrixPanel-I2S-DMA.cpp" "ESP32-HUB75-MatrixPanel-leddrivers.cpp"
INCLUDE_DIRS "."
REQUIRES arduino)
# In case you are running into issues with "missing" header files from 3rd party libraries like "Adafruit_GFX.h"
# you can add them to the REQUIRES section above (depending on how you added the library as component!) like
# REQUIRES arduino Adafruit-GFX-Library)
# Example to build with USE_GFX_ROOT or NO_GFX / just uncomment the appropriate line
# target_compile_options(${COMPONENT_TARGET} PUBLIC -DUSE_GFX_ROOT)
# target_compile_options(${COMPONENT_TARGET} PUBLIC -DNO_GFX)
# You can also use multiple options like this
# target_compile_options(${COMPONENT_TARGET} PUBLIC -DNO_GFX -DNO_FAST_FUNCTIONS)
# All options can be found here:
# https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/blob/master/doc/BuildOptions.md
project(ESP32-HUB75-MatrixPanel-I2S-DMA)

299
ESP32-HUB75-MatrixPanel-I2S-DMA.cpp
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@ -3,18 +3,18 @@
#if defined(ESP32_SXXX) #if defined(ESP32_SXXX)
#pragma message "Compiling for ESP32-Sx MCUs" #pragma message "Compiling for ESP32-Sx MCUs"
#elif defined(ESP32_CXXX) #elif defined(ESP32_CXXX)
#pragma message "Compiling for ESP32-Cx MCUs" #pragma message "Compiling for ESP32-Cx MCUs"
#elif CONFIG_IDF_TARGET_ESP32 || defined(ESP32) #elif CONFIG_IDF_TARGET_ESP32 || defined(ESP32)
#pragma message "Compiling for original 520kB SRAM ESP32." #pragma message "Compiling for original (released 2016) 520kB SRAM ESP32."
#else #else
#error "Compiling for something unknown!" #error "Compiling for something unknown!"
#endif #endif
// Credits: Louis Beaudoin <https://github.com/pixelmatix/SmartMatrix/tree/teensylc> // Credits: Louis Beaudoin <https://github.com/pixelmatix/SmartMatrix/tree/teensylc>
// and Sprite_TM: https://www.esp32.com/viewtopic.php?f=17&t=3188 and https://www.esp32.com/viewtopic.php?f=13&t=3256 // and Sprite_TM: https://www.esp32.com/viewtopic.php?f=17&t=3188 and https://www.esp32.com/viewtopic.php?f=13&t=3256
/* /*
@ -89,7 +89,7 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
size_t _dma_linked_list_memory_required = 0; size_t _dma_linked_list_memory_required = 0;
size_t _total_dma_capable_memory_reserved = 0; size_t _total_dma_capable_memory_reserved = 0;
// 1. Calculate the amount of DMA capable memory that's actually available // 1. Calculate the amount of DMA capable memory that's actually available
#if SERIAL_DEBUG #if SERIAL_DEBUG
Serial.printf_P(PSTR("Panel Width: %d pixels.\r\n"), PIXELS_PER_ROW); Serial.printf_P(PSTR("Panel Width: %d pixels.\r\n"), PIXELS_PER_ROW);
Serial.printf_P(PSTR("Panel Height: %d pixels.\r\n"), m_cfg.mx_height); Serial.printf_P(PSTR("Panel Height: %d pixels.\r\n"), m_cfg.mx_height);
@ -100,11 +100,11 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
Serial.println(F("DMA memory blocks available before any malloc's: ")); Serial.println(F("DMA memory blocks available before any malloc's: "));
heap_caps_print_heap_info(MALLOC_CAP_DMA); heap_caps_print_heap_info(MALLOC_CAP_DMA);
Serial.println(F("******************************************************************")); Serial.println(F("******************************************************************"));
Serial.printf_P(PSTR("We're going to need %d bytes of SRAM just for the frame buffer(s).\r\n"), _frame_buffer_memory_required); Serial.printf_P(PSTR("We're going to need %d bytes of SRAM just for the frame buffer(s).\r\n"), _frame_buffer_memory_required);
Serial.printf_P(PSTR("The total amount of DMA capable SRAM memory is %d bytes.\r\n"), heap_caps_get_free_size(MALLOC_CAP_DMA)); Serial.printf_P(PSTR("The total amount of DMA capable SRAM memory is %d bytes.\r\n"), heap_caps_get_free_size(MALLOC_CAP_DMA));
Serial.printf_P(PSTR("Largest DMA capable SRAM memory block is %d bytes.\r\n"), heap_caps_get_largest_free_block(MALLOC_CAP_DMA)); Serial.printf_P(PSTR("Largest DMA capable SRAM memory block is %d bytes.\r\n"), heap_caps_get_largest_free_block(MALLOC_CAP_DMA));
Serial.println(F("******************************************************************")); Serial.println(F("******************************************************************"));
#endif #endif
@ -118,20 +118,20 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
return false; return false;
} }
// Alright, theoretically we should be OK, so let us do this, so // Alright, theoretically we should be OK, so let us do this, so
// lets allocate a chunk of memory for each row (a row could span multiple panels if chaining is in place) // lets allocate a chunk of memory for each row (a row could span multiple panels if chaining is in place)
dma_buff.rowBits.reserve(ROWS_PER_FRAME); dma_buff.rowBits.reserve(ROWS_PER_FRAME);
// iterate through number of rows // iterate through number of rows
for (int malloc_num =0; malloc_num < ROWS_PER_FRAME; ++malloc_num) for (int malloc_num =0; malloc_num < ROWS_PER_FRAME; ++malloc_num)
{ {
auto ptr = std::make_shared<rowBitStruct>(PIXELS_PER_ROW, PIXEL_COLOR_DEPTH_BITS, m_cfg.double_buff); auto ptr = std::make_shared<rowBitStruct>(PIXELS_PER_ROW, PIXEL_COLOR_DEPTH_BITS, m_cfg.double_buff);
if (ptr->data == nullptr){ if (ptr->data == nullptr){
#if SERIAL_DEBUG #if SERIAL_DEBUG
Serial.printf_P(PSTR("ERROR: Couldn't malloc rowBitStruct %d! Critical fail.\r\n"), malloc_num); Serial.printf_P(PSTR("ERROR: Couldn't malloc rowBitStruct %d! Critical fail.\r\n"), malloc_num);
#endif #endif
return false; return false;
// TODO: should we release all previous rowBitStructs here??? // TODO: should we release all previous rowBitStructs here???
} }
@ -141,7 +141,7 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
Serial.printf_P(PSTR("Malloc'ing %d bytes of memory @ address %ud for frame row %d.\r\n"), ptr->size()*_num_frame_buffers, (unsigned int)ptr->getDataPtr(), malloc_num); Serial.printf_P(PSTR("Malloc'ing %d bytes of memory @ address %ud for frame row %d.\r\n"), ptr->size()*_num_frame_buffers, (unsigned int)ptr->getDataPtr(), malloc_num);
#endif #endif
} }
_total_dma_capable_memory_reserved += _frame_buffer_memory_required; _total_dma_capable_memory_reserved += _frame_buffer_memory_required;
@ -203,7 +203,7 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
#if SERIAL_DEBUG #if SERIAL_DEBUG
Serial.printf_P(PSTR("lsbMsbTransitionBit of %d gives %d Hz refresh: \r\n"), lsbMsbTransitionBit, actualRefreshRate); Serial.printf_P(PSTR("lsbMsbTransitionBit of %d gives %d Hz refresh: \r\n"), lsbMsbTransitionBit, actualRefreshRate);
#endif #endif
if (actualRefreshRate > m_cfg.min_refresh_rate) if (actualRefreshRate > m_cfg.min_refresh_rate)
break; break;
@ -218,7 +218,7 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
Serial.printf_P(PSTR("Raised lsbMsbTransitionBit to %d/%d to meet minimum refresh rate\r\n"), lsbMsbTransitionBit, PIXEL_COLOR_DEPTH_BITS - 1); Serial.printf_P(PSTR("Raised lsbMsbTransitionBit to %d/%d to meet minimum refresh rate\r\n"), lsbMsbTransitionBit, PIXEL_COLOR_DEPTH_BITS - 1);
#endif #endif
#endif #endif
/*** /***
* Step 2a: lsbMsbTransition bit is now finalised - recalculate the DMA descriptor count required, which is used for * Step 2a: lsbMsbTransition bit is now finalised - recalculate the DMA descriptor count required, which is used for
@ -238,7 +238,7 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
#if SERIAL_DEBUG #if SERIAL_DEBUG
Serial.printf_P(PSTR("rowColorDepthStruct struct is too large, split DMA payload required. Adding %d DMA descriptors\n"), PIXEL_COLOR_DEPTH_BITS-1); Serial.printf_P(PSTR("rowColorDepthStruct struct is too large, split DMA payload required. Adding %d DMA descriptors\n"), PIXEL_COLOR_DEPTH_BITS-1);
#endif #endif
numDMAdescriptorsPerRow += PIXEL_COLOR_DEPTH_BITS-1; numDMAdescriptorsPerRow += PIXEL_COLOR_DEPTH_BITS-1;
// Note: If numDMAdescriptorsPerRow is even just one descriptor too large, DMA linked list will not correctly loop. // Note: If numDMAdescriptorsPerRow is even just one descriptor too large, DMA linked list will not correctly loop.
@ -251,8 +251,8 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
_dma_linked_list_memory_required = numDMAdescriptorsPerRow * ROWS_PER_FRAME * _num_frame_buffers * sizeof(lldesc_t); _dma_linked_list_memory_required = numDMAdescriptorsPerRow * ROWS_PER_FRAME * _num_frame_buffers * sizeof(lldesc_t);
#if SERIAL_DEBUG #if SERIAL_DEBUG
Serial.printf_P(PSTR("Descriptors for lsbMsbTransitionBit of %d/%d with %d frame rows require %d bytes of DMA RAM with %d numDMAdescriptorsPerRow.\r\n"), lsbMsbTransitionBit, PIXEL_COLOR_DEPTH_BITS - 1, ROWS_PER_FRAME, _dma_linked_list_memory_required, numDMAdescriptorsPerRow); Serial.printf_P(PSTR("Descriptors for lsbMsbTransitionBit of %d/%d with %d frame rows require %d bytes of DMA RAM with %d numDMAdescriptorsPerRow.\r\n"), lsbMsbTransitionBit, PIXEL_COLOR_DEPTH_BITS - 1, ROWS_PER_FRAME, _dma_linked_list_memory_required, numDMAdescriptorsPerRow);
#endif #endif
_total_dma_capable_memory_reserved += _dma_linked_list_memory_required; _total_dma_capable_memory_reserved += _dma_linked_list_memory_required;
@ -300,7 +300,7 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
#endif #endif
// Just os we know // Just os we know
initialized = true; initialized = true;
return true; return true;
@ -398,10 +398,10 @@ void MatrixPanel_I2S_DMA::configureDMA(const HUB75_I2S_CFG& _cfg)
#if SERIAL_DEBUG #if SERIAL_DEBUG
Serial.printf_P(PSTR("configureDMA(): Configured LL structure. %d DMA Linked List descriptors populated.\r\n"), current_dmadescriptor_offset); Serial.printf_P(PSTR("configureDMA(): Configured LL structure. %d DMA Linked List descriptors populated.\r\n"), current_dmadescriptor_offset);
if ( desccount != current_dmadescriptor_offset) if ( desccount != current_dmadescriptor_offset)
{ {
Serial.printf_P(PSTR("configureDMA(): ERROR! Expected descriptor count of %d != actual DMA descriptors of %d!\r\n"), desccount, current_dmadescriptor_offset); Serial.printf_P(PSTR("configureDMA(): ERROR! Expected descriptor count of %d != actual DMA descriptors of %d!\r\n"), desccount, current_dmadescriptor_offset);
} }
#endif #endif
//End markers for DMA LL //End markers for DMA LL
@ -429,7 +429,7 @@ void MatrixPanel_I2S_DMA::configureDMA(const HUB75_I2S_CFG& _cfg)
.desccount_b=desccount, .desccount_b=desccount,
.lldesc_b=dmadesc_b, .lldesc_b=dmadesc_b,
.clkphase=_cfg.clkphase, .clkphase=_cfg.clkphase,
.int_ena_out_eof=_cfg.double_buff .int_ena_out_eof=_cfg.double_buff
}; };
// Setup I2S // Setup I2S
@ -444,7 +444,7 @@ void MatrixPanel_I2S_DMA::configureDMA(const HUB75_I2S_CFG& _cfg)
/* There are 'bits' set in the frameStruct that we simply don't need to set every single time we change a pixel / DMA buffer co-ordinate. /* There are 'bits' set in the frameStruct that we simply don't need to set every single time we change a pixel / DMA buffer co-ordinate.
* For example, the bits that determine the address lines, we don't need to set these every time. Once they're in place, and assuming we * For example, the bits that determine the address lines, we don't need to set these every time. Once they're in place, and assuming we
* don't accidentally clear them, then we don't need to set them again. * don't accidentally clear them, then we don't need to set them again.
* So to save processing, we strip this logic out to the absolute bare minimum, which is toggling only the R,G,B pixels (bits) per co-ord. * So to save processing, we strip this logic out to the absolute bare minimum, which is toggling only the R,G,B pixels (bits) per co-ord.
* *
@ -477,32 +477,32 @@ void IRAM_ATTR MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16
} }
/* LED Brightness Compensation. Because if we do a basic "red & mask" for example, /* LED Brightness Compensation. Because if we do a basic "red & mask" for example,
* we'll NEVER send the dimmest possible colour, due to binary skew. * we'll NEVER send the dimmest possible colour, due to binary skew.
* i.e. It's almost impossible for color_depth_idx of 0 to be sent out to the MATRIX unless the 'value' of a color is exactly '1' * i.e. It's almost impossible for color_depth_idx of 0 to be sent out to the MATRIX unless the 'value' of a color is exactly '1'
* https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/ * https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/
*/ */
#ifndef NO_CIE1931 #ifndef NO_CIE1931
red = lumConvTab[red]; red = lumConvTab[red];
green = lumConvTab[green]; green = lumConvTab[green];
blue = lumConvTab[blue]; blue = lumConvTab[blue];
#endif #endif
/* When using the drawPixel, we are obviously only changing the value of one x,y position, /* When using the drawPixel, we are obviously only changing the value of one x,y position,
* however, the two-scan panels paint TWO lines at the same time * however, the two-scan panels paint TWO lines at the same time
* and this reflects the parallel in-DMA-memory data structure of uint16_t's that are getting * and this reflects the parallel in-DMA-memory data structure of uint16_t's that are getting
* pumped out at high speed. * pumped out at high speed.
* *
* So we need to ensure we persist the bits (8 of them) of the uint16_t for the row we aren't changing. * So we need to ensure we persist the bits (8 of them) of the uint16_t for the row we aren't changing.
* *
* The DMA buffer order has also been reversed (refer to the last code in this function) * The DMA buffer order has also been reversed (refer to the last code in this function)
* so we have to check for this and check the correct position of the MATRIX_DATA_STORAGE_TYPE * so we have to check for this and check the correct position of the MATRIX_DATA_STORAGE_TYPE
* data. * data.
*/ */
#ifndef ESP32_SXXX #ifndef ESP32_SXXX
// We need to update the correct uint16_t in the rowBitStruct array, that gets sent out in parallel // We need to update the correct uint16_t in the rowBitStruct array, that gets sent out in parallel
// 16 bit parallel mode - Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering // 16 bit parallel mode - Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering
// Irrelevant for ESP32-S2 the way the FIFO ordering works is different - refer to page 679 of S2 technical reference manual // Irrelevant for ESP32-S2 the way the FIFO ordering works is different - refer to page 679 of S2 technical reference manual
x_coord & 1U ? --x_coord : ++x_coord; x_coord & 1U ? --x_coord : ++x_coord;
#endif #endif
@ -520,15 +520,15 @@ void IRAM_ATTR MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16
do { do {
--color_depth_idx; --color_depth_idx;
// uint8_t mask = (1 << (color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST)); // expect 24 bit color (8 bits per RGB subpixel) // uint8_t mask = (1 << (color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST)); // expect 24 bit color (8 bits per RGB subpixel)
#if PIXEL_COLOR_DEPTH_BITS < 8 #if PIXEL_COLOR_DEPTH_BITS < 8
uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel)
#else #else
uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel)
#endif #endif
uint16_t RGB_output_bits = 0; uint16_t RGB_output_bits = 0;
/* Per the .h file, the order of the output RGB bits is: /* Per the .h file, the order of the output RGB bits is:
* BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */ * BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */
RGB_output_bits |= (bool)(blue & mask); // --B RGB_output_bits |= (bool)(blue & mask); // --B
RGB_output_bits <<= 1; RGB_output_bits <<= 1;
RGB_output_bits |= (bool)(green & mask); // -BG RGB_output_bits |= (bool)(green & mask); // -BG
@ -555,11 +555,11 @@ void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(uint8_t red, uint8_t green, uint
{ {
if ( !initialized ) return; if ( !initialized ) return;
/* https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/ */ /* https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/ */
#ifndef NO_CIE1931 #ifndef NO_CIE1931
red = lumConvTab[red]; red = lumConvTab[red];
green = lumConvTab[green]; green = lumConvTab[green];
blue = lumConvTab[blue]; blue = lumConvTab[blue];
#endif #endif
for(uint8_t color_depth_idx=0; color_depth_idx<PIXEL_COLOR_DEPTH_BITS; color_depth_idx++) // color depth - 8 iterations for(uint8_t color_depth_idx=0; color_depth_idx<PIXEL_COLOR_DEPTH_BITS; color_depth_idx++) // color depth - 8 iterations
@ -567,21 +567,21 @@ void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(uint8_t red, uint8_t green, uint
// let's precalculate RGB1 and RGB2 bits than flood it over the entire DMA buffer // let's precalculate RGB1 and RGB2 bits than flood it over the entire DMA buffer
uint16_t RGB_output_bits = 0; uint16_t RGB_output_bits = 0;
// uint8_t mask = (1 << color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST); // 24 bit color // uint8_t mask = (1 << color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST); // 24 bit color
#if PIXEL_COLOR_DEPTH_BITS < 8 #if PIXEL_COLOR_DEPTH_BITS < 8
uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel)
#else #else
uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel)
#endif #endif
/* Per the .h file, the order of the output RGB bits is: /* Per the .h file, the order of the output RGB bits is:
* BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */ * BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */
RGB_output_bits |= (bool)(blue & mask); // --B RGB_output_bits |= (bool)(blue & mask); // --B
RGB_output_bits <<= 1; RGB_output_bits <<= 1;
RGB_output_bits |= (bool)(green & mask); // -BG RGB_output_bits |= (bool)(green & mask); // -BG
RGB_output_bits <<= 1; RGB_output_bits <<= 1;
RGB_output_bits |= (bool)(red & mask); // BGR RGB_output_bits |= (bool)(red & mask); // BGR
// Duplicate and shift across so we have have 6 populated bits of RGB1 and RGB2 pin values suitable for DMA buffer // Duplicate and shift across so we have have 6 populated bits of RGB1 and RGB2 pin values suitable for DMA buffer
RGB_output_bits |= RGB_output_bits << BITS_RGB2_OFFSET; //BGRBGR RGB_output_bits |= RGB_output_bits << BITS_RGB2_OFFSET; //BGRBGR
//Serial.printf("Fill with: 0x%#06x\n", RGB_output_bits); //Serial.printf("Fill with: 0x%#06x\n", RGB_output_bits);
@ -636,13 +636,13 @@ void MatrixPanel_I2S_DMA::clearFrameBuffer(bool _buff_id){
do { do {
--x_pixel; --x_pixel;
if ( m_cfg.driver == HUB75_I2S_CFG::SM5266P) { if ( m_cfg.driver == HUB75_I2S_CFG::SM5266P) {
// modifications here for row shift register type SM5266P // modifications here for row shift register type SM5266P
// https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/164 // https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/164
row[x_pixel] = abcde & (0x18 << BITS_ADDR_OFFSET); // mask out the bottom 3 bits which are the clk di bk inputs row[x_pixel] = abcde & (0x18 << BITS_ADDR_OFFSET); // mask out the bottom 3 bits which are the clk di bk inputs
} else { } else {
row[x_pixel] = abcde; row[x_pixel] = abcde;
} }
} while(x_pixel!=dma_buff.rowBits[row_idx]->width); } while(x_pixel!=dma_buff.rowBits[row_idx]->width);
@ -652,51 +652,51 @@ void MatrixPanel_I2S_DMA::clearFrameBuffer(bool _buff_id){
do { do {
--x_pixel; --x_pixel;
if ( m_cfg.driver == HUB75_I2S_CFG::SM5266P) { if ( m_cfg.driver == HUB75_I2S_CFG::SM5266P) {
// modifications here for row shift register type SM5266P // modifications here for row shift register type SM5266P
// https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/164 // https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/164
row[x_pixel] = abcde & (0x18 << BITS_ADDR_OFFSET); // mask out the bottom 3 bits which are the clk di bk inputs row[x_pixel] = abcde & (0x18 << BITS_ADDR_OFFSET); // mask out the bottom 3 bits which are the clk di bk inputs
} else { } else {
row[x_pixel] = abcde; row[x_pixel] = abcde;
} }
//row[x_pixel] = abcde; //row[x_pixel] = abcde;
} while(x_pixel); } while(x_pixel);
// modifications here for row shift register type SM5266P // modifications here for row shift register type SM5266P
// https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/164 // https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/164
if ( m_cfg.driver == HUB75_I2S_CFG::SM5266P) { if ( m_cfg.driver == HUB75_I2S_CFG::SM5266P) {
uint16_t serialCount; uint16_t serialCount;
uint16_t latch; uint16_t latch;
x_pixel = dma_buff.rowBits[row_idx]->width - 16; // come back 8*2 pixels to allow for 8 writes x_pixel = dma_buff.rowBits[row_idx]->width - 16; // come back 8*2 pixels to allow for 8 writes
serialCount = 8; serialCount = 8;
do{ do{
serialCount--; serialCount--;
latch = row[x_pixel] | (((((ESP32_I2S_DMA_STORAGE_TYPE)row_idx) % 8) == serialCount) << 1) << BITS_ADDR_OFFSET; // data on 'B' latch = row[x_pixel] | (((((ESP32_I2S_DMA_STORAGE_TYPE)row_idx) % 8) == serialCount) << 1) << BITS_ADDR_OFFSET; // data on 'B'
row[x_pixel++] = latch| (0x05<< BITS_ADDR_OFFSET); // clock high on 'A'and BK high for update row[x_pixel++] = latch| (0x05<< BITS_ADDR_OFFSET); // clock high on 'A'and BK high for update
row[x_pixel++] = latch| (0x04<< BITS_ADDR_OFFSET); // clock low on 'A'and BK high for update row[x_pixel++] = latch| (0x04<< BITS_ADDR_OFFSET); // clock low on 'A'and BK high for update
} while (serialCount); } while (serialCount);
} // end SM5266P } // end SM5266P
// let's set LAT/OE control bits for specific pixels in each color_index subrows // let's set LAT/OE control bits for specific pixels in each color_index subrows
// Need to consider the original ESP32's (WROOM) DMA TX FIFO reordering of bytes... // Need to consider the original ESP32's (WROOM) DMA TX FIFO reordering of bytes...
uint8_t coloridx = dma_buff.rowBits[row_idx]->color_depth; uint8_t coloridx = dma_buff.rowBits[row_idx]->color_depth;
do { do {
--coloridx; --coloridx;
// switch pointer to a row for a specific color index // switch pointer to a row for a specific color index
row = dma_buff.rowBits[row_idx]->getDataPtr(coloridx, _buff_id); row = dma_buff.rowBits[row_idx]->getDataPtr(coloridx, _buff_id);
#ifdef ESP32_SXXX #ifdef ESP32_SXXX
// -1 works better on ESP32-S2 ? Because bytes get sent out in order... // -1 works better on ESP32-S2 ? Because bytes get sent out in order...
row[dma_buff.rowBits[row_idx]->width - 1] |= BIT_LAT; // -1 pixel to compensate array index starting at 0 row[dma_buff.rowBits[row_idx]->width - 1] |= BIT_LAT; // -1 pixel to compensate array index starting at 0
#else #else
// We need to update the correct uint16_t in the rowBitStruct array, that gets sent out in parallel // We need to update the correct uint16_t in the rowBitStruct array, that gets sent out in parallel
// 16 bit parallel mode - Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering // 16 bit parallel mode - Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering
// Irrelevant for ESP32-S2 the way the FIFO ordering works is different - refer to page 679 of S2 technical reference manual // Irrelevant for ESP32-S2 the way the FIFO ordering works is different - refer to page 679 of S2 technical reference manual
row[dma_buff.rowBits[row_idx]->width - 2] |= BIT_LAT; // -2 in the DMA array is actually -1 when it's reordered by TX FIFO row[dma_buff.rowBits[row_idx]->width - 2] |= BIT_LAT; // -2 in the DMA array is actually -1 when it's reordered by TX FIFO
#endif #endif
// need to disable OE before/after latch to hide row transition // need to disable OE before/after latch to hide row transition
// Should be one clock or more before latch, otherwise can get ghosting // Should be one clock or more before latch, otherwise can get ghosting
@ -704,21 +704,21 @@ void MatrixPanel_I2S_DMA::clearFrameBuffer(bool _buff_id){
do { do {
--_blank; --_blank;
#ifdef ESP32_SXXX #ifdef ESP32_SXXX
row[0 + _blank] |= BIT_OE; row[0 + _blank] |= BIT_OE;
row[dma_buff.rowBits[row_idx]->width - _blank - 1 ] |= BIT_OE; // (LAT pulse is (width-2) -1 pixel to compensate array index starting at 0 row[dma_buff.rowBits[row_idx]->width - _blank - 1 ] |= BIT_OE; // (LAT pulse is (width-2) -1 pixel to compensate array index starting at 0
#else #else
// Original ESP32 WROOM FIFO Ordering Sucks // Original ESP32 WROOM FIFO Ordering Sucks
uint8_t _blank_row_tx_fifo_tmp = 0 + _blank; uint8_t _blank_row_tx_fifo_tmp = 0 + _blank;
(_blank_row_tx_fifo_tmp & 1U) ? --_blank_row_tx_fifo_tmp : ++_blank_row_tx_fifo_tmp; (_blank_row_tx_fifo_tmp & 1U) ? --_blank_row_tx_fifo_tmp : ++_blank_row_tx_fifo_tmp;
row[_blank_row_tx_fifo_tmp] |= BIT_OE; row[_blank_row_tx_fifo_tmp] |= BIT_OE;
_blank_row_tx_fifo_tmp = dma_buff.rowBits[row_idx]->width - _blank - 1; // (LAT pulse is (width-2) -1 pixel to compensate array index starting at 0 _blank_row_tx_fifo_tmp = dma_buff.rowBits[row_idx]->width - _blank - 1; // (LAT pulse is (width-2) -1 pixel to compensate array index starting at 0
(_blank_row_tx_fifo_tmp & 1U) ? --_blank_row_tx_fifo_tmp : ++_blank_row_tx_fifo_tmp; (_blank_row_tx_fifo_tmp & 1U) ? --_blank_row_tx_fifo_tmp : ++_blank_row_tx_fifo_tmp;
row[_blank_row_tx_fifo_tmp] |= BIT_OE; row[_blank_row_tx_fifo_tmp] |= BIT_OE;
#endif #endif
} while (_blank); } while (_blank);
@ -759,22 +759,25 @@ void MatrixPanel_I2S_DMA::brtCtrlOE(int brt, const bool _buff_id){
do { do {
--x_coord; --x_coord;
// clear OE bit for all other pixels
row[x_coord] &= BITMASK_OE_CLEAR;
// Brightness control via OE toggle - disable matrix output at specified x_coord // Brightness control via OE toggle - disable matrix output at specified x_coord
if((coloridx > lsbMsbTransitionBit || !coloridx) && ((x_coord) >= brt)){ if((coloridx > lsbMsbTransitionBit || !coloridx) && ((x_coord) >= brt)){
row[x_coord] |= BIT_OE; // Disable output after this point. row[x_coord] |= BIT_OE; // Disable output after this point.
continue; continue;
} }
// special case for the bits *after* LSB through (lsbMsbTransitionBit) - OE is output after data is shifted, so need to set OE to fractional brightness // special case for the bits *after* LSB through (lsbMsbTransitionBit) - OE is output after data is shifted, so need to set OE to fractional brightness
if(coloridx && coloridx <= lsbMsbTransitionBit) { if(coloridx && coloridx <= lsbMsbTransitionBit) {
// divide brightness in half for each bit below lsbMsbTransitionBit // divide brightness in half for each bit below lsbMsbTransitionBit
int lsbBrightness = brt >> (lsbMsbTransitionBit - coloridx + 1); int lsbBrightness = brt >> (lsbMsbTransitionBit - coloridx + 1);
if((x_coord) >= lsbBrightness) if((x_coord) >= lsbBrightness) {
row[x_coord] |= BIT_OE; // Disable output after this point. row[x_coord] |= BIT_OE; // Disable output after this point.
continue; continue;
}
} }
// clear OE bit for all other pixels
row[x_coord] &= BITMASK_OE_CLEAR;
} while(x_coord); } while(x_coord);
// need to disable OE before/after latch to hide row transition // need to disable OE before/after latch to hide row transition
@ -783,14 +786,14 @@ void MatrixPanel_I2S_DMA::brtCtrlOE(int brt, const bool _buff_id){
do { do {
--_blank; --_blank;
#ifdef ESP32_SXXX #ifdef ESP32_SXXX
row[0 + _blank] |= BIT_OE; row[0 + _blank] |= BIT_OE;
#else #else
// Original ESP32 WROOM FIFO Ordering Sucks // Original ESP32 WROOM FIFO Ordering Sucks
uint8_t _blank_row_tx_fifo_tmp = 0 + _blank; uint8_t _blank_row_tx_fifo_tmp = 0 + _blank;
(_blank_row_tx_fifo_tmp & 1U) ? --_blank_row_tx_fifo_tmp : ++_blank_row_tx_fifo_tmp; (_blank_row_tx_fifo_tmp & 1U) ? --_blank_row_tx_fifo_tmp : ++_blank_row_tx_fifo_tmp;
row[_blank_row_tx_fifo_tmp] |= BIT_OE; row[_blank_row_tx_fifo_tmp] |= BIT_OE;
#endif #endif
//row[0 + _blank] |= BIT_OE; //row[0 + _blank] |= BIT_OE;
// no need, has been done already // no need, has been done already
@ -866,9 +869,9 @@ void MatrixPanel_I2S_DMA::hlineDMA(int16_t x_coord, int16_t y_coord, int16_t l,
/* LED Brightness Compensation */ /* LED Brightness Compensation */
#ifndef NO_CIE1931 #ifndef NO_CIE1931
red = lumConvTab[red]; red = lumConvTab[red];
green = lumConvTab[green]; green = lumConvTab[green];
blue = lumConvTab[blue]; blue = lumConvTab[blue];
#endif #endif
uint16_t _colorbitclear = BITMASK_RGB1_CLEAR, _colorbitoffset = 0; uint16_t _colorbitclear = BITMASK_RGB1_CLEAR, _colorbitoffset = 0;
@ -887,14 +890,14 @@ void MatrixPanel_I2S_DMA::hlineDMA(int16_t x_coord, int16_t y_coord, int16_t l,
// let's precalculate RGB1 and RGB2 bits than flood it over the entire DMA buffer // let's precalculate RGB1 and RGB2 bits than flood it over the entire DMA buffer
uint16_t RGB_output_bits = 0; uint16_t RGB_output_bits = 0;
// uint8_t mask = (1 << color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST); // uint8_t mask = (1 << color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST);
#if PIXEL_COLOR_DEPTH_BITS < 8 #if PIXEL_COLOR_DEPTH_BITS < 8
uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel)
#else #else
uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel)
#endif #endif
/* Per the .h file, the order of the output RGB bits is: /* Per the .h file, the order of the output RGB bits is:
* BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */ * BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */
RGB_output_bits |= (bool)(blue & mask); // --B RGB_output_bits |= (bool)(blue & mask); // --B
RGB_output_bits <<= 1; RGB_output_bits <<= 1;
RGB_output_bits |= (bool)(green & mask); // -BG RGB_output_bits |= (bool)(green & mask); // -BG
@ -948,9 +951,9 @@ void MatrixPanel_I2S_DMA::vlineDMA(int16_t x_coord, int16_t y_coord, int16_t l,
/* LED Brightness Compensation */ /* LED Brightness Compensation */
#ifndef NO_CIE1931 #ifndef NO_CIE1931
red = lumConvTab[red]; red = lumConvTab[red];
green = lumConvTab[green]; green = lumConvTab[green];
blue = lumConvTab[blue]; blue = lumConvTab[blue];
#endif #endif
#ifndef ESP32_SXXX #ifndef ESP32_SXXX
@ -964,15 +967,15 @@ void MatrixPanel_I2S_DMA::vlineDMA(int16_t x_coord, int16_t y_coord, int16_t l,
// let's precalculate RGB1 and RGB2 bits than flood it over the entire DMA buffer // let's precalculate RGB1 and RGB2 bits than flood it over the entire DMA buffer
// uint8_t mask = (1 << color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST); // uint8_t mask = (1 << color_depth_idx COLOR_DEPTH_LESS_THAN_8BIT_ADJUST);
#if PIXEL_COLOR_DEPTH_BITS < 8 #if PIXEL_COLOR_DEPTH_BITS < 8
uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx+MASK_OFFSET)); // expect 24 bit color (8 bits per RGB subpixel)
#else #else
uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel) uint8_t mask = (1 << (color_depth_idx)); // expect 24 bit color (8 bits per RGB subpixel)
#endif #endif
uint16_t RGB_output_bits = 0; uint16_t RGB_output_bits = 0;
/* Per the .h file, the order of the output RGB bits is: /* Per the .h file, the order of the output RGB bits is:
* BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */ * BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */
RGB_output_bits |= (bool)(blue & mask); // --B RGB_output_bits |= (bool)(blue & mask); // --B
RGB_output_bits <<= 1; RGB_output_bits <<= 1;
RGB_output_bits |= (bool)(green & mask); // -BG RGB_output_bits |= (bool)(green & mask); // -BG

1
ESP32-HUB75-MatrixPanel-I2S-DMA.h
View file

@ -132,7 +132,6 @@
#define ESP32_I2S_DMA_MODE I2S_PARALLEL_WIDTH_16 // From esp32_i2s_parallel_v2.h = 16 bits in parallel #define ESP32_I2S_DMA_MODE I2S_PARALLEL_WIDTH_16 // From esp32_i2s_parallel_v2.h = 16 bits in parallel
#define ESP32_I2S_DMA_STORAGE_TYPE uint16_t // DMA output of one uint16_t at a time. #define ESP32_I2S_DMA_STORAGE_TYPE uint16_t // DMA output of one uint16_t at a time.
#define CLKS_DURING_LATCH 0 // Not (yet) used. #define CLKS_DURING_LATCH 0 // Not (yet) used.
#define ESP32_I2S_DEVICE I2S_NUM_0
// Panel Upper half RGB (numbering according to order in DMA gpio_bus configuration) // Panel Upper half RGB (numbering according to order in DMA gpio_bus configuration)
#define BITS_RGB1_OFFSET 0 // Start point of RGB_X1 bits #define BITS_RGB1_OFFSET 0 // Start point of RGB_X1 bits

4
ESP32-VirtualMatrixPanel-I2S-DMA.h
View file

@ -133,7 +133,7 @@ inline VirtualCoords VirtualMatrixPanel::getCoords(int16_t &x, int16_t &y) {
//Serial.println("Called Base."); //Serial.println("Called Base.");
coords.x = coords.y = -1; // By defalt use an invalid co-ordinates that will be rejected by updateMatrixDMABuffer coords.x = coords.y = -1; // By defalt use an invalid co-ordinates that will be rejected by updateMatrixDMABuffer
if ( x < 0 || x >= width() || y < 0 || y >= height() ) { // Co-ordinates go from 0 to X-1 remember! width() and height() are out of range! if ( x < 0 || x >= virtualResX || y < 0 || y >= virtualResY ) { // Co-ordinates go from 0 to X-1 remember! otherwise they are out of range!
//Serial.printf("VirtualMatrixPanel::getCoords(): Invalid virtual display coordinate. x,y: %d, %d\r\n", x, y); //Serial.printf("VirtualMatrixPanel::getCoords(): Invalid virtual display coordinate. x,y: %d, %d\r\n", x, y);
return coords; return coords;
} }
@ -247,8 +247,10 @@ inline void VirtualMatrixPanel::drawPixelRGB888(int16_t x, int16_t y, uint8_t r,
inline void VirtualMatrixPanel::setRotate(bool rotate) { inline void VirtualMatrixPanel::setRotate(bool rotate) {
_rotate=rotate; _rotate=rotate;
#ifndef NO_GFX
// We don't support rotation by degrees. // We don't support rotation by degrees.
if (rotate) { setRotation(1); } else { setRotation(0); } if (rotate) { setRotation(1); } else { setRotation(0); }
#endif
} }
inline void VirtualMatrixPanel::setPhysicalPanelScanRate(PANEL_SCAN_RATE rate) { inline void VirtualMatrixPanel::setPhysicalPanelScanRate(PANEL_SCAN_RATE rate) {

1
component.mk Normal file
View file

@ -0,0 +1 @@
COMPONENT_ADD_INCLUDEDIRS = .

34
esp32_i2s_parallel_dma.c
View file

@ -22,7 +22,6 @@
#include <driver/gpio.h> #include <driver/gpio.h>
#include <driver/periph_ctrl.h> #include <driver/periph_ctrl.h>
#include <rom/gpio.h>
#include <soc/gpio_sig_map.h> #include <soc/gpio_sig_map.h>
// For I2S state management. // For I2S state management.
@ -47,41 +46,28 @@ volatile bool previousBufferFree = true;
static void IRAM_ATTR irq_hndlr(void* arg) { // if we use I2S1 (default) static void IRAM_ATTR irq_hndlr(void* arg) { // if we use I2S1 (default)
#ifdef ESP32_ORIG //i2s_port_t port = *((i2s_port_t*) arg);
if ( (*(i2s_port_t*)arg) == I2S_NUM_1 ) { // https://www.bogotobogo.com/cplusplus/pointers2_voidpointers_arrays.php /* Compiler pre-processor check. Saves a few cycles, no need to cast void ptr to i2s_port_t and then check 120 times second... */
//For I2S1 #if ESP32_I2S_DEVICE == I2S_NUM_0
SET_PERI_REG_BITS(I2S_INT_CLR_REG(1), I2S_OUT_EOF_INT_CLR_V, 1, I2S_OUT_EOF_INT_CLR_S); SET_PERI_REG_BITS(I2S_INT_CLR_REG(1), I2S_OUT_EOF_INT_CLR_V, 1, I2S_OUT_EOF_INT_CLR_S);
} else { #else
// For I2S0 // For I2S0
SET_PERI_REG_BITS(I2S_INT_CLR_REG(0), I2S_OUT_EOF_INT_CLR_V, 1, I2S_OUT_EOF_INT_CLR_S); SET_PERI_REG_BITS(I2S_INT_CLR_REG(0), I2S_OUT_EOF_INT_CLR_V, 1, I2S_OUT_EOF_INT_CLR_S);
}
#else
// Other ESP32 MCU's only have one I2S
SET_PERI_REG_BITS(I2S_INT_CLR_REG(0), I2S_OUT_EOF_INT_CLR_V, 1, I2S_OUT_EOF_INT_CLR_S);
#endif #endif
/*
if ( previousBufferOutputLoopCount == 1)
{
// at this point, the previously active buffer is free, go ahead and write to it
previousBufferFree = true;
////previousBufferOutputLoopCount = 0;
//i2s_parallel_set_previous_buffer_not_free();
}
else { previousBufferOutputLoopCount++; }
*/
previousBufferFree = true; previousBufferFree = true;
// if(shiftCompleteCallback) // we've defined a callback function ? /*
// shiftCompleteCallback(); if(shiftCompleteCallback) { // we've defined a callback function ?
shiftCompleteCallback();
}
*/
} // end irq_hndlr } // end irq_hndlr
// For peripheral setup and configuration // For peripheral setup and configuration
static inline int get_bus_width(i2s_parallel_cfg_bits_t width) { static inline int get_bus_width(i2s_parallel_cfg_bits_t width) {
switch(width) { switch(width) {
case I2S_PARALLEL_WIDTH_8: case I2S_PARALLEL_WIDTH_8:

20
esp32_i2s_parallel_dma.h
View file

@ -19,7 +19,11 @@ extern "C" {
#include <freertos/FreeRTOS.h> #include <freertos/FreeRTOS.h>
#include <driver/i2s.h> #include <driver/i2s.h>
#include <esp_err.h> #include <esp_err.h>
//#include <esp32/rom/lldesc.h>
//#include <esp32/rom/gpio.h>
#include <rom/lldesc.h> #include <rom/lldesc.h>
#include <rom/gpio.h>
// Get MCU Type and Max CLK Hz for MCU // Get MCU Type and Max CLK Hz for MCU
#include <esp32_i2s_parallel_mcu_def.h> #include <esp32_i2s_parallel_mcu_def.h>
@ -41,7 +45,7 @@ typedef struct {
int desccount_b; // only used with double buffering int desccount_b; // only used with double buffering
lldesc_t * lldesc_b; // only used with double buffering lldesc_t * lldesc_b; // only used with double buffering
bool clkphase; // Clock signal phase bool clkphase; // Clock signal phase
bool int_ena_out_eof; // Do we raise an interrupt every time the DMA output loops? Don't do this unless we're doing double buffering! bool int_ena_out_eof; // Do we raise an interrupt every time the DMA output loops? Don't do this unless we're doing double buffering!
} i2s_parallel_config_t; } i2s_parallel_config_t;
static inline int i2s_parallel_get_memory_width(i2s_port_t port, i2s_parallel_cfg_bits_t width) { static inline int i2s_parallel_get_memory_width(i2s_port_t port, i2s_parallel_cfg_bits_t width) {
@ -49,12 +53,14 @@ static inline int i2s_parallel_get_memory_width(i2s_port_t port, i2s_parallel_cf
case I2S_PARALLEL_WIDTH_8: case I2S_PARALLEL_WIDTH_8:
#ifdef ESP32_ORIG #ifdef ESP32_ORIG
// IS21 supports space saving single byte 8 bit parallel access // Only I2S1 on the legacy ESP32 WROOM MCU supports space saving single byte 8 bit parallel access
if(port == I2S_NUM_1) { if(port == I2S_NUM_1) {
return 1; return 1;
} else {
return 2;
} }
#else #else
return 1; return 1;
#endif #endif
case I2S_PARALLEL_WIDTH_16: case I2S_PARALLEL_WIDTH_16:
@ -70,10 +76,10 @@ static inline int i2s_parallel_get_memory_width(i2s_port_t port, i2s_parallel_cf
void link_dma_desc(volatile lldesc_t *dmadesc, volatile lldesc_t *prevdmadesc, void *memory, size_t size); void link_dma_desc(volatile lldesc_t *dmadesc, volatile lldesc_t *prevdmadesc, void *memory, size_t size);
// I2S DMA Peripheral Setup Functions // I2S DMA Peripheral Setup Functions
esp_err_t i2s_parallel_driver_install(i2s_port_t port, i2s_parallel_config_t* conf); esp_err_t i2s_parallel_driver_install(i2s_port_t port, i2s_parallel_config_t* conf);
esp_err_t i2s_parallel_send_dma(i2s_port_t port, lldesc_t* dma_descriptor); esp_err_t i2s_parallel_send_dma(i2s_port_t port, lldesc_t* dma_descriptor);
esp_err_t i2s_parallel_stop_dma(i2s_port_t port); esp_err_t i2s_parallel_stop_dma(i2s_port_t port);
//i2s_dev_t* i2s_parallel_get_dev(i2s_port_t port); //i2s_dev_t* i2s_parallel_get_dev(i2s_port_t port);
// For frame buffer flipping / double buffering // For frame buffer flipping / double buffering
typedef struct { typedef struct {

313
esp32_i2s_parallel_dma_cxxx.txt
View file

@ -1,313 +0,0 @@
/*
* ESP32_I2S_PARALLEL_DMA (Version 3)
*
* Author: Mrfaptastic @ https://github.com/mrfaptastic/
*
* Description: Multi-ESP32 product DMA setup functions for ESP32 C3/H2 RISC-V chips
*
* ESP32C series doesn't support LCD mode / parallel DMA!
*
*/
// Header
#include "esp32_i2s_parallel_dma.h"
#if defined(ESP32_CXXX)
#include <esp_err.h>
// Turn on and off a peripheral
#include <driver/periph_ctrl.h>
// GPIO
#include <soc/gpio_periph.h>
#include <hal/gpio_types.h>
#include <driver/gpio.h>
#include <driver/periph_ctrl.h>
#include <rom/gpio.h>
#include <soc/gpio_sig_map.h>
// DMA Linked List Struct
#include <soc/lldesc.h>
#include <soc/io_mux_reg.h>
// I2S
#include <soc/i2s_struct.h>
#include <soc/i2s_reg.h>
// GDMA
#include <soc/gdma_channel.h>
#include <soc/gdma_periph.h>
#include <soc/gdma_reg.h>
#include <soc/gdma_struct.h>
// For I2S state management.
static i2s_parallel_state_t *i2s_state = NULL;
// ESP32-S2,S3,C3 only has IS20
// Original ESP32 has two I2S's, but we'll stick with the lowest common denominator.
static i2s_dev_t* I2S = &I2S0; // Device to use for this library, change if you want.
callback shiftCompleteCallback;
void setShiftCompleteCallback(callback f) {
shiftCompleteCallback = f;
}
volatile bool previousBufferFree = true;
static void IRAM_ATTR gdma_irq_handler(void* arg) { // if we use I2S1 (default)
GDMA.intr[0].clr.out_eof = 1;
// at this point, the previously active buffer is free, go ahead and write to it
// previousBufferFree = true;
// if(shiftCompleteCallback) // we've defined a callback function ?
// shiftCompleteCallback();
// at this point, the previously active buffer is free, go ahead and write to it
previousBufferFree = true;
if(shiftCompleteCallback) // we've defined a callback function ?
shiftCompleteCallback();
} // end irq_hndlr
// For peripheral setup and configuration
static inline int get_bus_width(i2s_parallel_cfg_bits_t width) {
switch(width) {
case I2S_PARALLEL_WIDTH_8:
return 8;
case I2S_PARALLEL_WIDTH_16:
return 16;
case I2S_PARALLEL_WIDTH_24:
return 24;
default:
return -ESP_ERR_INVALID_ARG;
}
}
static void gpio_setup_out(int gpio, int sig) {
if(gpio < 0) {
return;
}
// Configure GPIO
// https://github.com/espressif/esp-idf/blob/d5f58ab13551cd883e8d8478ba367b6e4543ffec/examples/peripherals/gpio/generic_gpio/main/gpio_example_main.c
gpio_config_t io_conf = {};
io_conf.intr_type = GPIO_INTR_DISABLE;
io_conf.mode = GPIO_MODE_DEF_OUTPUT;
io_conf.pin_bit_mask = (1ULL << gpio);
io_conf.pull_down_en = 1;
io_conf.pull_up_en = 0;
gpio_config(&io_conf);
// Set IOMUX to GPIO
//gpio_iomux_out(gpio, sig, false); // ?? is sig right?
gpio_matrix_out(gpio, sig, false, false);
// Drive Strength to MAX
gpio_set_drive_capability((gpio_num_t)gpio, (gpio_drive_cap_t)3);
}
// DMA Linked List
// Size must be less than DMA_MAX - need to handle breaking long transfer into two descriptors before call
// DMA_MAX by the way is the maximum data packet size you can hold in one chunk
void link_dma_desc(volatile lldesc_t *dmadesc, volatile lldesc_t *prevdmadesc, void *memory, size_t size)
{
if(size > DMA_MAX) size = DMA_MAX;
dmadesc->size = size;
dmadesc->length = size;
dmadesc->buf = memory;
dmadesc->eof = 0;
dmadesc->sosf = 0;
dmadesc->owner = 1;
dmadesc->qe.stqe_next = 0; // will need to set this elsewhere
dmadesc->offset = 0;
// link previous to current
if(prevdmadesc)
prevdmadesc->qe.stqe_next = (lldesc_t*)dmadesc;
}
esp_err_t i2s_parallel_driver_install(i2s_port_t port, i2s_parallel_config_t* cfg) {
port = I2S_NUM_0; /// override.
if(port < I2S_NUM_0 || port >= I2S_NUM_MAX) {
return ESP_ERR_INVALID_ARG;
}
if(cfg->sample_width < I2S_PARALLEL_WIDTH_8 || cfg->sample_width >= I2S_PARALLEL_WIDTH_MAX) {
return ESP_ERR_INVALID_ARG;
}
if(cfg->sample_rate > I2S_PARALLEL_CLOCK_HZ || cfg->sample_rate < 1) {
return ESP_ERR_INVALID_ARG;
}
uint32_t clk_div_main = I2S_PARALLEL_CLOCK_HZ / cfg->sample_rate / i2s_parallel_get_memory_width(port, cfg->sample_width);
if(clk_div_main < 2 || clk_div_main > 0xFF) {
return ESP_ERR_INVALID_ARG;
}
// Setup GPIOs
int bus_width = get_bus_width(cfg->sample_width);
i2s_dev_t *i2s_dev = I2S; // There's only one I2S device on C3....
//Figure out which signal numbers to use for routing
//printf("Setting up parallel I2S bus at I2S%d\n", i2snum(dev));
int sig_data_base = I2SO_SD_OUT_IDX;
int sig_clk = I2SO_WS_OUT_IDX;
//Route the signals
for (int x=0; x < bus_width; x++) {
gpio_setup_out(cfg->gpio_bus[x], sig_data_base+x);
}
//ToDo: Clk/WS may need inversion?
gpio_setup_out(cfg->gpio_clk, sig_clk);
// Power on I2S1 (or 0)
periph_module_enable(PERIPH_I2S1_MODULE);
// Now it's apparently I2S0 !?
//i2s_dev_t *i2s_dev = &I2S0;
// Reset RX (not that we use it)
i2s_dev->rx_conf.val = 0;
i2s_dev->rx_conf.rx_reset=1; i2s_dev->rx_conf.rx_reset=0;
i2s_dev->rx_conf.rx_fifo_reset=1; i2s_dev->rx_conf.rx_fifo_reset=0;
// Reset TX (what we care about)
i2s_dev->tx_conf.val = 0;
i2s_dev->tx_conf.tx_reset=1; i2s_dev->tx_conf.tx_reset=0;
i2s_dev->tx_conf.tx_fifo_reset=1; i2s_dev->tx_conf.tx_fifo_reset=0;
i2s_dev->tx_conf.tx_chan_equal=1;
// Device setup
i2s_dev->tx_conf1.val = 0;
i2s_dev->tx_conf1.tx_bits_mod=16;//cfg->bits;
i2s_dev->rx_conf1.val = 0;
i2s_dev->rx_conf1.rx_bits_mod=16; //cfg->bits;
i2s_dev->tx_conf1.tx_bck_div_num=2;
i2s_dev->rx_conf1.rx_bck_div_num=2;
i2s_dev->tx_clkm_conf.val=0;
i2s_dev->tx_clkm_conf.tx_clk_sel=2; // 160mhz
// clock speed
i2s_dev->tx_clkm_conf.tx_clkm_div_num=160/16; // 10Mhz
//i2s_dev->tx_clkm_div_conf.val = 0; //
i2s_dev->tx_clkm_div_conf.tx_clkm_div_x = 0; // > ?
i2s_dev->tx_clkm_div_conf.tx_clkm_div_y = 0; //
i2s_dev->tx_clkm_div_conf.tx_clkm_div_yn1 = 0;
i2s_dev->tx_clkm_div_conf.tx_clkm_div_z = 0;
i2s_dev->tx_clkm_conf.tx_clk_active=1; // Start
//Allocate DMA descriptors
i2s_state = malloc(sizeof(i2s_parallel_state_t));
assert(i2s_state != NULL);
i2s_parallel_state_t *st= i2s_state;
st->desccount_a = cfg->desccount_a;
st->desccount_b = cfg->desccount_b;
st->dmadesc_a = cfg->lldesc_a;
st->dmadesc_b = cfg->lldesc_b;
// setup I2S Interrupt
// SET_PERI_REG_BITS(I2S_INT_ENA_REG(1), I2S_OUT_EOF_INT_ENA_V, 1, I2S_OUT_EOF_INT_ENA_S);
// allocate a level 1 interrupt: lowest priority, as ISR isn't urgent and may take a long time to complete
esp_intr_alloc(ETS_I2S1_INTR_SOURCE, (int)(ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_LEVEL1), gdma_irq_handler, NULL, NULL);
GDMA.intr[0].ena.out_eof = 1; //?
// Reset GDMA device
GDMA.channel[0].out.out_conf0.out_rst = 1; // REG_SET_BIT(DMA_OUT_CONF0_CH0_REG, DMA_OUT_RST_CH0);
GDMA.channel[0].out.out_conf0.out_rst = 0; // REG_CLR_BIT(DMA_OUT_CONF0_CH0_REG, DMA_OUT_RST_CH0);
// GDMA.channel[0].out.out_conf0.out_eof_mode = 1; ?
GDMA.misc_conf.ahbm_rst_inter = 1;
GDMA.misc_conf.ahbm_rst_inter = 0;
// Setup interrupt
// Setup outlink
GDMA.channel[0].out.out_link.addr = ((uint32_t)(&st->dmadesc_a[0]));// Set a value here
GDMA.channel[0].out.out_peri_sel.sel = SOC_GDMA_TRIG_PERIPH_I2S0; // 3 = I2S0
GDMA.channel[0].out.out_conf0.out_data_burst_en = 1;
GDMA.channel[0].out.out_conf0.outdscr_burst_en = 1;
GDMA.channel[0].out.out_link.start = 1;
while (!GDMA.intr->raw.out_eof) { } // check status
i2s_dev->tx_conf.tx_start = 1;
return ESP_OK;
}
esp_err_t i2s_parallel_stop_dma(i2s_port_t port) {
if(port < I2S_NUM_0 || port >= I2S_NUM_MAX) {
return ESP_ERR_INVALID_ARG;
}
// Not implemented
return ESP_OK;
}
esp_err_t i2s_parallel_send_dma(i2s_port_t port, lldesc_t* dma_descriptor) {
if(port < I2S_NUM_0 || port >= I2S_NUM_MAX) {
return ESP_ERR_INVALID_ARG;
}
// Not implemented
return ESP_OK;
}
i2s_dev_t* i2s_parallel_get_dev(i2s_port_t port) {
if(port < I2S_NUM_0 || port >= I2S_NUM_MAX) {
return NULL;
}
return I2S; // HARCODE THIS TO RETURN &I2S0
}
// Double buffering flipping
// Flip to a buffer: 0 for bufa, 1 for bufb
void i2s_parallel_flip_to_buffer(i2s_port_t port, int buffer_id) {
if (i2s_state == NULL) {
return; // :-()
}
lldesc_t *active_dma_chain;
if (buffer_id == 0) {
active_dma_chain=(lldesc_t*)&i2s_state->dmadesc_a[0];
} else {
active_dma_chain=(lldesc_t*)&i2s_state->dmadesc_b[0];
}
// setup linked list to refresh from new buffer (continuously) when the end of the current list has been reached
i2s_state->dmadesc_a[i2s_state->desccount_a-1].qe.stqe_next = active_dma_chain;
i2s_state->dmadesc_b[i2s_state->desccount_b-1].qe.stqe_next = active_dma_chain;
// we're still shifting out the buffer, so it shouldn't be written to yet.
previousBufferFree = false;
}
bool i2s_parallel_is_previous_buffer_free() {
return previousBufferFree;
}
// End ESP32 original / S2, S3 check
#endif

2
esp32_i2s_parallel_mcu_def.h
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@ -10,6 +10,7 @@
#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3 #if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
#define ESP32_SXXX 1 #define ESP32_SXXX 1
#define ESP32_I2S_DEVICE I2S_NUM_0
#define I2S_PARALLEL_CLOCK_HZ 160000000L #define I2S_PARALLEL_CLOCK_HZ 160000000L
#define DMA_MAX (4096-4) #define DMA_MAX (4096-4)
@ -18,6 +19,7 @@
// 2016 model that started it all, and this library. The best. // 2016 model that started it all, and this library. The best.
#define ESP32_ORIG 1 #define ESP32_ORIG 1
#define ESP32_I2S_DEVICE I2S_NUM_0
#define I2S_PARALLEL_CLOCK_HZ 80000000L #define I2S_PARALLEL_CLOCK_HZ 80000000L
#define DMA_MAX (4096-4) #define DMA_MAX (4096-4)

146
examples/ChainedPanelsScreenBuffer/ChainedPanelsScreenBuffer.ino Normal file
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@ -0,0 +1,146 @@
/*************************************************************************
* IMPORANT PLEASE READ THE INFORMATION BELOW!
*
* This example implements a 'pixel buffer' which is essentally an
* off-screen copy of what is intended to be sent to output (LED panels)
*
* This essentially means DOUBLE THE AMOUNT OF MEMORY is required to
* to store the off-screen image/pixel/display buffer WITH a similar
* amount of memory used for the DMA output buffer for the physical panels.
*
* This means the practical resolution you will be able to output with the
* ESP32 will be CUT IN HALF. Do not try to run huge chains of
* LED Matrix Panels using this buffer, you will run out of memory.
*
* Please DO NOT raise issues @ github about running out of memory,
* we can't do anything about it. It's an ESP32, not a Raspberry Pi!
*
*************************************************************************/
/* Use the FastLED_Pixel_Buffer class to handle panel chaining
* (it's based on the VirtualMatrixPanel class) AND also create an
* off-screen CRGB FastLED pixel buffer.
*/
#include "FastLED_Pixel_Buffer.h"
// Panel configuration
#define PANEL_RES_X 64 // Number of pixels wide of each INDIVIDUAL panel module.
#define PANEL_RES_Y 32 // Number of pixels tall of each INDIVIDUAL panel module.
#define NUM_ROWS 1 // Number of rows of chained INDIVIDUAL PANELS
#define NUM_COLS 2 // Number of INDIVIDUAL PANELS per ROW
// Change this to your needs, for details please read the PDF in
// the 'ChainedPanels'example folder!
#define SERPENT true
#define TOPDOWN false
// placeholder for the matrix object
MatrixPanel_I2S_DMA *dma_display = nullptr;
// placeholder for the virtual display object
VirtualMatrixPanel_FastLED_Pixel_Buffer *FastLED_Pixel_Buff = nullptr;
/******************************************************************************
* Setup!
******************************************************************************/
void setup()
{
delay(250);
Serial.begin(115200);
Serial.println(""); Serial.println(""); Serial.println("");
Serial.println("*****************************************************");
Serial.println("* FastLED Pixel BufferDemonstration *");
Serial.println("*****************************************************");
/*
// 62x32 1/8 Scan Panels don't have a D and E pin!
HUB75_I2S_CFG::i2s_pins _pins = {
R1_PIN, G1_PIN, B1_PIN, R2_PIN, G2_PIN, B2_PIN,
A_PIN, B_PIN, C_PIN, D_PIN, E_PIN,
LAT_PIN, OE_PIN, CLK_PIN
};
*/
HUB75_I2S_CFG mxconfig(
PANEL_RES_X, // DO NOT CHANGE THIS
PANEL_RES_Y, // DO NOT CHANGE THIS
NUM_ROWS*NUM_COLS // DO NOT CHANGE THIS
//,_pins // Uncomment to enable custom pins
);
mxconfig.clkphase = false; // Change this if you see pixels showing up shifted wrongly by one column the left or right.
//mxconfig.driver = HUB75_I2S_CFG::FM6126A; // in case that we use panels based on FM6126A chip, we can set it here before creating MatrixPanel_I2S_DMA object
// Do NOT use mxconfig.double_buffer when using this pixel buffer.
// OK, now we can create our matrix object
dma_display = new MatrixPanel_I2S_DMA(mxconfig);
// let's adjust default physical panel brightness to about 75%
dma_display->setBrightness8(96); // range is 0-255, 0 - 0%, 255 - 100%
// Allocate memory and start DMA electrical output to physical panels
if( not dma_display->begin() )
Serial.println("****** !KABOOM! I2S memory allocation failed ***********");
dma_display->clearScreen();
delay(500);
// NOW, create the 'Virtual Matrix Panel' class with a FastLED Pixel Buffer! Pass it a dma_display hardware library pointer to use.
FastLED_Pixel_Buff = new VirtualMatrixPanel_FastLED_Pixel_Buffer((*dma_display), NUM_ROWS, NUM_COLS, PANEL_RES_X, PANEL_RES_Y, SERPENT, TOPDOWN);
if( not FastLED_Pixel_Buff->allocateMemory() )
Serial.println("****** !KABOOM! Unable to find enough memory for the FastLED pixel buffer! ***********");
}
// Borrowed from the SimpleTextShapes example.
uint16_t colorWheel(uint8_t pos) {
if(pos < 85) {
return dma_display->color565(pos * 3, 255 - pos * 3, 0);
} else if(pos < 170) {
pos -= 85;
return dma_display->color565(255 - pos * 3, 0, pos * 3);
} else {
pos -= 170;
return dma_display->color565(0, pos * 3, 255 - pos * 3);
}
}
/* A crap demonstration of using the pixel buffer.
* 1) Draw text at an incrementing (going down) y coordinate
* 2) Move down a pixel row
* 3) Draw the text again, fade the 'old' pixels. Using the pixel buffer to update all pixels on screen.
* 4) 'show' (send) the pixel buffer to the DMA output.
* 5) LOOP
*/
uint8_t y_coord = 0;
uint8_t wheel = 0;
void loop()
{
// draw text with a rotating colour
FastLED_Pixel_Buff->dimAll(200); // Dim all pixels by 250/255
FastLED_Pixel_Buff->setTextSize(1); // size 1 == 8 pixels high
FastLED_Pixel_Buff->setTextWrap(false); // Don't wrap at end of line - will do ourselves
FastLED_Pixel_Buff->setCursor(FastLED_Pixel_Buff->width()/4, y_coord); // start at top left, with 8 pixel of spacing
FastLED_Pixel_Buff->setTextColor(colorWheel(wheel++));
FastLED_Pixel_Buff->print("MythicalForce");
FastLED_Pixel_Buff->show(); // IMPORTANT -> SEND Pixel Buffer to DMA / Panel Output!
y_coord++;
if ( y_coord >= FastLED_Pixel_Buff->height())
y_coord = 0;
delay(35);
} // end loop

116
examples/ChainedPanelsScreenBuffer/FastLED_Pixel_Buffer.cpp Normal file
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@ -0,0 +1,116 @@
/**
* Experimental layer class to do play with pixel in an off-screen buffer before painting to the DMA
*
* Requires FastLED
*
* Faptastic 2020-2021
**/
#include "FastLED_Pixel_Buffer.h"
/**
* The one for 256+ matrices
* otherwise this:
* for (uint8_t i = 0; i < MATRIX_WIDTH; i++) {}
* turns into an infinite loop
*/
inline uint16_t VirtualMatrixPanel_FastLED_Pixel_Buffer::XY16( uint16_t x, uint16_t y) {
if (x >= virtualResX) return 0;
if (y >= virtualResY) return 0;
return (y * virtualResX) + x + 1; // everything offset by one to compute out of bounds stuff - never displayed by ShowFrame()
}
// For adafruit
void VirtualMatrixPanel_FastLED_Pixel_Buffer::drawPixel(int16_t x, int16_t y, uint16_t color) {
//Serial.println("calling our drawpixel!");
// 565 color conversion
uint8_t r = ((((color >> 11) & 0x1F) * 527) + 23) >> 6;
uint8_t g = ((((color >> 5) & 0x3F) * 259) + 33) >> 6;
uint8_t b = (((color & 0x1F) * 527) + 23) >> 6;
this->drawPixel(x, y, CRGB(r,g,b));
}
void VirtualMatrixPanel_FastLED_Pixel_Buffer::drawPixel(int16_t x, int16_t y, int r, int g, int b) {
this->drawPixel(x, y, CRGB(r,g,b));
}
// We actually just draw to ourselves... to our buffer
void VirtualMatrixPanel_FastLED_Pixel_Buffer::drawPixel(int16_t x, int16_t y, CRGB color)
{
//Serial.printf("updated x y : %d %d", x, y);
buffer[XY16(x,y)] = color;
}
CRGB VirtualMatrixPanel_FastLED_Pixel_Buffer::getPixel(int16_t x, int16_t y)
{
return buffer[XY16(x,y)];
}
/**
* Dim all the pixels on the layer.
*/
void VirtualMatrixPanel_FastLED_Pixel_Buffer::dimAll(byte value) {
//Serial.println("performing dimall");
// nscale8 max value is 255, or it'll flip back to 0
// (documentation is wrong when it says x/256), it's actually x/255
/*
for (int y = 0; y < LAYER_HEIGHT; y++) {
for (int x = 0; x < LAYER_WIDTH; x++) {
pixels->data[y][x].nscale8(value);
}}
*/
dimRect(0,0, virtualResX, virtualResY, value);
}
/**
* Dim all the pixels in a rectangular option of the layer the layer.
*/
void VirtualMatrixPanel_FastLED_Pixel_Buffer::dimRect(int16_t x, int16_t y, int16_t w, int16_t h, byte value) {
for (int16_t i = x; i < x + w; i++)
{
for (int16_t j = y; j < y + h; j++)
{
buffer[XY16(i,j)].nscale8(value);
}
}
}
void VirtualMatrixPanel_FastLED_Pixel_Buffer::clear() {
memset(buffer, CRGB(0,0,0), (virtualResX * virtualResY) );
}
/**
* Actually Send the CRGB FastLED buffer to the DMA engine / Physical Panels!
* Do this via the underlying 'VirtualMatrixPanel' that does all the pixel-remapping for
* all sorts of chained panels, and panel scan types.
*/
void VirtualMatrixPanel_FastLED_Pixel_Buffer::show() {
//Serial.println("Doing Show");
CRGB _pixel = 0;
for (int16_t y = 0; y < virtualResY; y++) {
for (int16_t x = 0; x < virtualResX; x++)
{
//VirtualMatrixPanel::getCoords(x, y); // call to base to update coords for chaining approach
_pixel = buffer[XY16(x,y)];
drawPixelRGB888( x, y, _pixel.r, _pixel.g, _pixel.b); // call VirtualMatrixPanel::drawPixelRGB888(...)
//drawPixelRGB888( x, y, 0, 0, 128); // call VirtualMatrixPanel::drawPixelRGB888(...)
} // end loop to copy fast led to the dma matrix
}
} // show
/**
* Cleanup should we delete this buffer class. Unlikely during runtime.
*/
VirtualMatrixPanel_FastLED_Pixel_Buffer::~VirtualMatrixPanel_FastLED_Pixel_Buffer(void)
{
delete(buffer);
}

51
examples/ChainedPanelsScreenBuffer/FastLED_Pixel_Buffer.h Normal file
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@ -0,0 +1,51 @@
#ifndef VIRTUAL_MATRIX_PANEL_FASTLED_LAYER
#define VIRTUAL_MATRIX_PANEL_FASTLED_LAYER
#include <ESP32-VirtualMatrixPanel-I2S-DMA.h>
#include <FastLED.h>
class VirtualMatrixPanel_FastLED_Pixel_Buffer : public VirtualMatrixPanel
{
public:
using VirtualMatrixPanel::VirtualMatrixPanel; // perform VirtualMatrixPanel class constructor
bool allocateMemory() // allocate memory
{
// https://www.geeksforgeeks.org/how-to-declare-a-2d-array-dynamically-in-c-using-new-operator/
buffer = new CRGB[virtualResX * virtualResY]; // These are defined in the underliny
if (!buffer) { return false; }
Serial.printf("Allocated %d bytes of memory for pixel buffer.\r\n", sizeof(CRGB)*((virtualResX * virtualResY)+1));
this->clear();
return true;
} // end Buffer
virtual void drawPixel(int16_t x, int16_t y, uint16_t color); // overwrite adafruit implementation
void drawPixel(int16_t x, int16_t y, int r, int g, int b); // Buffer implementation
void drawPixel(int16_t x, int16_t y, CRGB color); // Buffer implementation
CRGB getPixel(int16_t x, int16_t y); // Returns a pixel value from the buffer.
void dimAll(byte value);
void dimRect(int16_t x, int16_t y, int16_t w, int16_t h, byte value);
void clear();
void show(); // Send buffer to physical hardware / DMA engine.
// Release Memory
~VirtualMatrixPanel_FastLED_Pixel_Buffer(void);
protected:
uint16_t XY16( uint16_t x, uint16_t y);
private:
CRGB* buffer = nullptr;
};
#endif

8
examples/One_Eight_1_8_ScanPanel/README.md
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@ -4,10 +4,4 @@
ESP32-HUB75-MatrixPanel-I2S-DMA library will not display output correctly with 1/8 scan panels such [as this](https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/154) by default. ESP32-HUB75-MatrixPanel-I2S-DMA library will not display output correctly with 1/8 scan panels such [as this](https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/issues/154) by default.
## Solution ## Solution
It is possible to connect 1/8 scan panels to this library and 'trick' the output to work correctly on these panels by way of adjusting the pixel co-ordinates that are 'sent' to the ESP32-HUB75-MatrixPanel-I2S-DMA library (in this example, it is the 'dmaOutput' class). It is possible to connect 1/8 scan panels to this library and 'trick' the output to work correctly on these panels by way of adjusting the pixel co-ordinates that are 'sent' to the underlying ESP32-HUB75-MatrixPanel-I2S-DMA library (in this example, it is the 'dmaOutput' class).
Creation of a '1_8_ScanPanel.h' class which sends an adjusted drawPixel() x,y co-ordinates to the underlying ESP32-HUB75-MatrixPanel-I2S-DMA library's drawPixel routine, to trick the output to look pixel perfect.
Refer to the '1_8_ScanPanel.h' logic which builds upon the library's core Virtual Display 'ESP32-VirtualMatrixPanel-I2S-DMA.h' to also support chaining of 1/8 Scan Panels as well. Refer to 'ChainedPanels' example on how to configure panel chaining to create bigger displays.

5
examples/README.md
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@ -6,8 +6,9 @@
|AnimatedGIFPanel |Using Larry Bank's GIF Decoder to display animated GIFs. | |AnimatedGIFPanel |Using Larry Bank's GIF Decoder to display animated GIFs. |
|AuroraDemo |Simple example demonstrating various animated effects. | |AuroraDemo |Simple example demonstrating various animated effects. |
|BitmapIcons |Simple example of how to display a bitmap image to the display. | |BitmapIcons |Simple example of how to display a bitmap image to the display. |
|ChainedPanels |Popular example on how to use the 'VirtualDisplay' class to chain multiple LED Matrix Panels to form a much bigger display! Refer to the README within this example's folder! | |ChainedPanels |Popular example on how to use the 'VirtualMatrixPanel' class to chain multiple LED Matrix Panels to form a much bigger display! Refer to the README within this example's folder! |
|ChainedPanelsAuroraDemo |As above, but showing a large trippy plasma animation. | |ChainedPanelsAuroraDemo |As above, but showing a large trippy plasma animation. |
|One_Quarter_1_4_ScanPanel |Using this library with a 32w x 16h 1/4 Scan LED Matrix Panel. Custom co-ordinate remapping logic required. | |ChainedPanelsScreenBuffer |Using the same 'VirtualMatrixPanel' class but also implementing a FastLED off-screen pixel buffer to do cool stuff. |
|One_Quarter_1_4_ScanPanel |Using this library with a 32w x 16h 1/4 Scan LED Matrix Panel. Custom co-ordinate remapping logic required. NOT WORKING. |
|One_Eighth_1_8_ScanPanel |Using this library with a 64w x 32h 1/8 Scan LED Matrix Panel. Custom co-ordinate remapping logic required. |One_Eighth_1_8_ScanPanel |Using this library with a 64w x 32h 1/8 Scan LED Matrix Panel. Custom co-ordinate remapping logic required.
|PIO_TestPatterns |Non-Arduino example of how to display basic shapes. | |PIO_TestPatterns |Non-Arduino example of how to display basic shapes. |