883 lines
41 KiB
C++
883 lines
41 KiB
C++
#include "ESP32-HUB75-MatrixPanel-I2S-DMA.h"
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// Credits: Louis Beaudoin <https://github.com/pixelmatix/SmartMatrix/tree/teensylc>
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// and Sprite_TM: https://www.esp32.com/viewtopic.php?f=17&t=3188 and https://www.esp32.com/viewtopic.php?f=13&t=3256
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/*
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This is example code to driver a p3(2121)64*32 -style RGB LED display. These types of displays do not have memory and need to be refreshed
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continuously. The display has 2 RGB inputs, 4 inputs to select the active line, a pixel clock input, a latch enable input and an output-enable
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input. The display can be seen as 2 64x16 displays consisting of the upper half and the lower half of the display. Each half has a separate
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RGB pixel input, the rest of the inputs are shared.
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Each display half can only show one line of RGB pixels at a time: to do this, the RGB data for the line is input by setting the RGB input pins
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to the desired value for the first pixel, giving the display a clock pulse, setting the RGB input pins to the desired value for the second pixel,
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giving a clock pulse, etc. Do this 64 times to clock in an entire row. The pixels will not be displayed yet: until the latch input is made high,
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the display will still send out the previously clocked in line. Pulsing the latch input high will replace the displayed data with the data just
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clocked in.
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The 4 line select inputs select where the currently active line is displayed: when provided with a binary number (0-15), the latched pixel data
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will immediately appear on this line. Note: While clocking in data for a line, the *previous* line is still displayed, and these lines should
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be set to the value to reflect the position the *previous* line is supposed to be on.
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Finally, the screen has an OE input, which is used to disable the LEDs when latching new data and changing the state of the line select inputs:
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doing so hides any artefacts that appear at this time. The OE line is also used to dim the display by only turning it on for a limited time every
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line.
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All in all, an image can be displayed by 'scanning' the display, say, 100 times per second. The slowness of the human eye hides the fact that
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only one line is showed at a time, and the display looks like every pixel is driven at the same time.
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Now, the RGB inputs for these types of displays are digital, meaning each red, green and blue subpixel can only be on or off. This leads to a
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color palette of 8 pixels, not enough to display nice pictures. To get around this, we use binary code modulation.
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Binary code modulation is somewhat like PWM, but easier to implement in our case. First, we define the time we would refresh the display without
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binary code modulation as the 'frame time'. For, say, a four-bit binary code modulation, the frame time is divided into 15 ticks of equal length.
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We also define 4 subframes (0 to 3), defining which LEDs are on and which LEDs are off during that subframe. (Subframes are the same as a
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normal frame in non-binary-coded-modulation mode, but are showed faster.) From our (non-monochrome) input image, we take the (8-bit: bit 7
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to bit 0) RGB pixel values. If the pixel values have bit 7 set, we turn the corresponding LED on in subframe 3. If they have bit 6 set,
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we turn on the corresponding LED in subframe 2, if bit 5 is set subframe 1, if bit 4 is set in subframe 0.
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Now, in order to (on average within a frame) turn a LED on for the time specified in the pixel value in the input data, we need to weigh the
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subframes. We have 15 pixels: if we show subframe 3 for 8 of them, subframe 2 for 4 of them, subframe 1 for 2 of them and subframe 1 for 1 of
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them, this 'automatically' happens. (We also distribute the subframes evenly over the ticks, which reduces flicker.)
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In this code, we use the I2S peripheral in parallel mode to achieve this. Essentially, first we allocate memory for all subframes. This memory
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contains a sequence of all the signals (2xRGB, line select, latch enable, output enable) that need to be sent to the display for that subframe.
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Then we ask the I2S-parallel driver to set up a DMA chain so the subframes are sent out in a sequence that satisfies the requirement that
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subframe x has to be sent out for (2^x) ticks. Finally, we fill the subframes with image data.
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We use a front buffer/back buffer technique here to make sure the display is refreshed in one go and drawing artifacts do not reach the display.
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In practice, for small displays this is not really necessarily.
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*/
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// For development testing only
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//#define IGNORE_REFRESH_RATE 1
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uint8_t val2PWM(int val) {
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if (val<0) val=0;
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if (val>255) val=255;
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return lumConvTab[val];
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}
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bool MatrixPanel_I2S_DMA::allocateDMAmemory()
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{
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/***
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* Step 1: Look at the overall DMA capable memory for the DMA FRAMEBUFFER data only (not the DMA linked list descriptors yet)
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* and do some pre-checks.
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*/
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int _num_frame_buffers = (double_buffering_enabled) ? 2:1;
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size_t _frame_buffer_memory_required = sizeof(frameStruct) * _num_frame_buffers;
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size_t _dma_linked_list_memory_required = 0;
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size_t _total_dma_capable_memory_reserved = 0;
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// 1. Calculate the amount of DMA capable memory that's actually available
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#if SERIAL_DEBUG
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Serial.printf("Panel Height: %d pixels.\r\n", MATRIX_HEIGHT);
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Serial.printf("Panel Width: %d pixels.\r\n", MATRIX_WIDTH);
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if (double_buffering_enabled) {
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Serial.println("DOUBLE FRAME BUFFERS / DOUBLE BUFFERING IS ENABLED. DOUBLE THE RAM REQUIRED!");
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}
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Serial.println("DMA memory blocks available before any malloc's: ");
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heap_caps_print_heap_info(MALLOC_CAP_DMA);
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Serial.printf("We're going to need %d bytes of SRAM just for the frame buffer(s).\r\n", _frame_buffer_memory_required);
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Serial.printf("The total amount of DMA capable SRAM memory is %d bytes.\r\n", heap_caps_get_free_size(MALLOC_CAP_DMA));
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Serial.printf("Largest DMA capable SRAM memory block is %d bytes.\r\n", heap_caps_get_largest_free_block(MALLOC_CAP_DMA));
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#endif
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// Can we potentially fit the framebuffer into the DMA capable memory that's available?
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if ( heap_caps_get_free_size(MALLOC_CAP_DMA) < _frame_buffer_memory_required ) {
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#if SERIAL_DEBUG
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Serial.printf("######### Insufficient memory for requested resolution. Reduce MATRIX_COLOR_DEPTH and try again.\r\n\tAdditional %d bytes of memory required.\r\n\r\n", (_frame_buffer_memory_required-heap_caps_get_free_size(MALLOC_CAP_DMA)) );
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#endif
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return false;
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}
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// Alright, theoretically we should be OK, so let us do this, so
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// lets allocate a chunk of memory for each row (a row could span multiple panels if chaining is in place)
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for (int malloc_num =0; malloc_num < ROWS_PER_FRAME; malloc_num++)
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{
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matrix_row_framebuffer_malloc[malloc_num] = (rowColorDepthStruct *)heap_caps_malloc( (sizeof(rowColorDepthStruct) * _num_frame_buffers) , MALLOC_CAP_DMA);
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// If the ESP crashes here, then we must have a horribly fragmented memory space, or trying to allocate a ludicrous resolution.
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#if SERIAL_DEBUG
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Serial.printf("Malloc'ing %d bytes of memory @ address %d for frame row %d.\r\n", (sizeof(rowColorDepthStruct) * _num_frame_buffers), matrix_row_framebuffer_malloc[malloc_num], malloc_num);
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#endif
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if ( matrix_row_framebuffer_malloc[malloc_num] == NULL ) {
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Serial.printf("ERROR: Couldn't malloc matrix_row_framebuffer %d! Critical fail.\r\n", malloc_num);
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return false;
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}
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}
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_total_dma_capable_memory_reserved += _frame_buffer_memory_required;
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/***
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* Step 2: Calculate the amount of memory required for the DMA engine's linked list descriptors.
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* Credit to SmartMatrix for this stuff.
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*/
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// Calculate what colour depth is actually possible based on memory available vs. required dma linked-list descriptors.
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// aka. Calculate the lowest LSBMSB_TRANSITION_BIT value that will fit in memory
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int numDMAdescriptorsPerRow = 0;
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lsbMsbTransitionBit = 0;
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while(1) {
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numDMAdescriptorsPerRow = 1;
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for(int i=lsbMsbTransitionBit + 1; i<PIXEL_COLOR_DEPTH_BITS; i++) {
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numDMAdescriptorsPerRow += (1<<(i - lsbMsbTransitionBit - 1));
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}
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int ramrequired = numDMAdescriptorsPerRow * ROWS_PER_FRAME * _num_frame_buffers * sizeof(lldesc_t);
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int largestblockfree = heap_caps_get_largest_free_block(MALLOC_CAP_DMA);
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#if SERIAL_DEBUG
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Serial.printf("lsbMsbTransitionBit of %d with %d DMA descriptors per frame row, requires %d bytes RAM, %d available, leaving %d free: \r\n", lsbMsbTransitionBit, numDMAdescriptorsPerRow, ramrequired, largestblockfree, largestblockfree - ramrequired);
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#endif
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if(ramrequired < largestblockfree)
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break;
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if(lsbMsbTransitionBit < PIXEL_COLOR_DEPTH_BITS - 1)
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lsbMsbTransitionBit++;
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else
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break;
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}
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Serial.printf("Raised lsbMsbTransitionBit to %d/%d to fit in remaining RAM\r\n", lsbMsbTransitionBit, PIXEL_COLOR_DEPTH_BITS - 1);
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#ifndef IGNORE_REFRESH_RATE
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// calculate the lowest LSBMSB_TRANSITION_BIT value that will fit in memory that will meet or exceed the configured refresh rate
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while(1) {
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int psPerClock = 1000000000000UL/ESP32_I2S_CLOCK_SPEED;
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int nsPerLatch = ((PIXELS_PER_ROW + CLKS_DURING_LATCH) * psPerClock) / 1000;
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// add time to shift out LSBs + LSB-MSB transition bit - this ignores fractions...
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int nsPerRow = PIXEL_COLOR_DEPTH_BITS * nsPerLatch;
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// add time to shift out MSBs
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for(int i=lsbMsbTransitionBit + 1; i<PIXEL_COLOR_DEPTH_BITS; i++)
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nsPerRow += (1<<(i - lsbMsbTransitionBit - 1)) * (PIXEL_COLOR_DEPTH_BITS - i) * nsPerLatch;
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int nsPerFrame = nsPerRow * ROWS_PER_FRAME;
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int actualRefreshRate = 1000000000UL/(nsPerFrame);
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calculated_refresh_rate = actualRefreshRate;
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#if SERIAL_DEBUG
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Serial.printf("lsbMsbTransitionBit of %d gives %d Hz refresh: \r\n", lsbMsbTransitionBit, actualRefreshRate);
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#endif
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if (actualRefreshRate > min_refresh_rate) // HACK Hard Coded: 100
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break;
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if(lsbMsbTransitionBit < PIXEL_COLOR_DEPTH_BITS - 1)
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lsbMsbTransitionBit++;
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else
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break;
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}
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Serial.printf("Raised lsbMsbTransitionBit to %d/%d to meet minimum refresh rate\r\n", lsbMsbTransitionBit, PIXEL_COLOR_DEPTH_BITS - 1);
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#endif
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/***
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* Step 2a: lsbMsbTransition bit is now finalised - recalculate the DMA descriptor count required, which is used for
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* memory allocation of the DMA linked list memory structure.
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*/
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numDMAdescriptorsPerRow = 1;
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for(int i=lsbMsbTransitionBit + 1; i<PIXEL_COLOR_DEPTH_BITS; i++) {
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numDMAdescriptorsPerRow += (1<<(i - lsbMsbTransitionBit - 1));
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}
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// Refer to 'DMA_LL_PAYLOAD_SPLIT' code in configureDMA() below to understand why this exists.
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// numDMAdescriptorsPerRow is also used to calcaulte descount which is super important in i2s_parallel_config_t SoC DMA setup.
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if ( sizeof(rowColorDepthStruct) > DMA_MAX ) {
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#if SERIAL_DEBUG
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Serial.println("Split DMA payload required.");
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#endif
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numDMAdescriptorsPerRow += PIXEL_COLOR_DEPTH_BITS-1;
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// Not if numDMAdescriptorsPerRow is even just one descriptor too large, DMA linked list will not correctly loop.
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}
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/***
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* Step 3: Allocate memory for DMA linked list, linking up each framebuffer row in sequence for GPIO output.
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*/
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_dma_linked_list_memory_required = numDMAdescriptorsPerRow * ROWS_PER_FRAME * _num_frame_buffers * sizeof(lldesc_t);
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#if SERIAL_DEBUG
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Serial.printf("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);
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#endif
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_total_dma_capable_memory_reserved += _dma_linked_list_memory_required;
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// Do a final check to see if we have enough space for the additional DMA linked list descriptors that will be required to link it all up!
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if(_dma_linked_list_memory_required > heap_caps_get_largest_free_block(MALLOC_CAP_DMA)) {
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Serial.printf("ERROR: Not enough SRAM left over for DMA linked-list descriptor memory reservation! Oh so close!\r\n");
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return false;
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} // linked list descriptors memory check
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// malloc the DMA linked list descriptors that i2s_parallel will need
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desccount = numDMAdescriptorsPerRow * ROWS_PER_FRAME;
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//lldesc_t * dmadesc_a = (lldesc_t *)heap_caps_malloc(desccount * sizeof(lldesc_t), MALLOC_CAP_DMA);
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dmadesc_a = (lldesc_t *)heap_caps_malloc(desccount * sizeof(lldesc_t), MALLOC_CAP_DMA);
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assert("Can't allocate descriptor framebuffer a");
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if(!dmadesc_a) {
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Serial.printf("ERROR: Could not malloc descriptor framebuffer a.");
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return false;
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}
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if (double_buffering_enabled) // reserve space for second framebuffer linked list
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{
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//lldesc_t * dmadesc_b = (lldesc_t *)heap_caps_malloc(desccount * sizeof(lldesc_t), MALLOC_CAP_DMA);
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dmadesc_b = (lldesc_t *)heap_caps_malloc(desccount * sizeof(lldesc_t), MALLOC_CAP_DMA);
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assert("Could not malloc descriptor framebuffer b.");
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if(!dmadesc_b) {
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Serial.printf("ERROR: Could not malloc descriptor framebuffer b.");
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return false;
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}
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}
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Serial.printf("*** ESP32-HUB75-MatrixPanel-I2S-DMA: Memory Allocations Complete *** \r\n");
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Serial.printf("Total memory that was reserved: %d kB.\r\n", _total_dma_capable_memory_reserved/1024);
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Serial.printf("... of which was used for the DMA Linked List(s): %d kB.\r\n", _dma_linked_list_memory_required/1024);
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Serial.printf("Heap Memory Available: %d bytes total. Largest free block: %d bytes.\r\n", heap_caps_get_free_size(0), heap_caps_get_largest_free_block(0));
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Serial.printf("General RAM Available: %d bytes total. Largest free block: %d bytes.\r\n", heap_caps_get_free_size(MALLOC_CAP_DEFAULT), heap_caps_get_largest_free_block(MALLOC_CAP_DEFAULT));
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#if SERIAL_DEBUG
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Serial.println("DMA capable memory map available after malloc's: ");
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heap_caps_print_heap_info(MALLOC_CAP_DMA);
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delay(1000);
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#endif
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// Just os we know
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everything_OK = true;
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return true;
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} // end initMatrixDMABuffer()
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void MatrixPanel_I2S_DMA::configureDMA(int r1_pin, int g1_pin, int b1_pin, int r2_pin, int g2_pin, int b2_pin, int a_pin, int b_pin, int c_pin, int d_pin, int e_pin, int lat_pin, int oe_pin, int clk_pin)
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{
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#if SERIAL_DEBUG
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Serial.println("configureDMA(): Starting configuration of DMA engine.\r\n");
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#endif
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lldesc_t *previous_dmadesc_a = 0;
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lldesc_t *previous_dmadesc_b = 0;
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int current_dmadescriptor_offset = 0;
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// HACK: If we need to split the payload in 1/2 so that it doesn't breach DMA_MAX, lets do it by the color_depth.
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int num_dma_payload_color_depths = PIXEL_COLOR_DEPTH_BITS;
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if ( sizeof(rowColorDepthStruct) > DMA_MAX ) {
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num_dma_payload_color_depths = 1;
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}
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// Fill DMA linked lists for both frames (as in, halves of the HUB75 panel) and if double buffering is enabled, link it up for both buffers.
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for(int row = 0; row < ROWS_PER_FRAME; row++) {
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// Split framebuffer malloc hack 'improvement'
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rowColorDepthStruct *fb_malloc_ptr = matrix_row_framebuffer_malloc[row];
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#if SERIAL_DEBUG
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Serial.printf("DMA payload of %d bytes. DMA_MAX is %d.\r\n", sizeof(rowBitStruct) * PIXEL_COLOR_DEPTH_BITS, DMA_MAX);
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#endif
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// first set of data is LSB through MSB, single pass (IF TOTAL SIZE < DMA_MAX) - all color bits are displayed once, which takes care of everything below and inlcluding LSBMSB_TRANSITION_BIT
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// NOTE: size must be less than DMA_MAX - worst case for library: 16-bpp with 256 pixels per row would exceed this, need to break into two
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link_dma_desc(&dmadesc_a[current_dmadescriptor_offset], previous_dmadesc_a, &(fb_malloc_ptr[0].rowbits[0].data), sizeof(rowBitStruct) * num_dma_payload_color_depths);
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previous_dmadesc_a = &dmadesc_a[current_dmadescriptor_offset];
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if (double_buffering_enabled) {
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link_dma_desc(&dmadesc_b[current_dmadescriptor_offset], previous_dmadesc_b, &(fb_malloc_ptr[1].rowbits[0].data), sizeof(rowBitStruct) * num_dma_payload_color_depths);
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previous_dmadesc_b = &dmadesc_b[current_dmadescriptor_offset]; }
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current_dmadescriptor_offset++;
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// If the number of pixels per row is to great for the size of a DMA payload, so we need to split what we were going to send above.
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if ( sizeof(rowColorDepthStruct) > DMA_MAX )
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{
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#if SERIAL_DEBUG
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Serial.printf("Spliting DMA payload for %d color depths into %d byte payloads.\r\n", PIXEL_COLOR_DEPTH_BITS-1, sizeof(rowBitStruct) );
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#endif
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for (int cd = 1; cd < PIXEL_COLOR_DEPTH_BITS; cd++)
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{
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// first set of data is LSB through MSB, single pass - all color bits are displayed once, which takes care of everything below and inlcluding LSBMSB_TRANSITION_BIT
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// TODO: size must be less than DMA_MAX - worst case for library: 16-bpp with 256 pixels per row would exceed this, need to break into two
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link_dma_desc(&dmadesc_a[current_dmadescriptor_offset], previous_dmadesc_a, &(fb_malloc_ptr[0].rowbits[cd].data), sizeof(rowBitStruct) );
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previous_dmadesc_a = &dmadesc_a[current_dmadescriptor_offset];
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if (double_buffering_enabled) {
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link_dma_desc(&dmadesc_b[current_dmadescriptor_offset], previous_dmadesc_b, &(fb_malloc_ptr[1].rowbits[cd].data), sizeof(rowBitStruct) );
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previous_dmadesc_b = &dmadesc_b[current_dmadescriptor_offset]; }
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current_dmadescriptor_offset++;
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} // additional linked list items
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} // row depth struct
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for(int i=lsbMsbTransitionBit + 1; i<PIXEL_COLOR_DEPTH_BITS; i++)
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{
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// binary time division setup: we need 2 of bit (LSBMSB_TRANSITION_BIT + 1) four of (LSBMSB_TRANSITION_BIT + 2), etc
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// because we sweep through to MSB each time, it divides the number of times we have to sweep in half (saving linked list RAM)
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// we need 2^(i - LSBMSB_TRANSITION_BIT - 1) == 1 << (i - LSBMSB_TRANSITION_BIT - 1) passes from i to MSB
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//Serial.printf("buffer %d: repeat %d times, size: %d, from %d - %d\r\n", current_dmadescriptor_offset, 1<<(i - lsbMsbTransitionBit - 1), (PIXEL_COLOR_DEPTH_BITS - i), i, PIXEL_COLOR_DEPTH_BITS-1);
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#if SERIAL_DEBUG
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Serial.printf("configureDMA(): DMA Loops for PIXEL_COLOR_DEPTH_BITS %d is: %d.\r\n", i, (1<<(i - lsbMsbTransitionBit - 1)));
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#endif
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for(int k=0; k < (1<<(i - lsbMsbTransitionBit - 1)); k++)
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{
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link_dma_desc(&dmadesc_a[current_dmadescriptor_offset], previous_dmadesc_a, &(fb_malloc_ptr[0].rowbits[i].data), sizeof(rowBitStruct) * (PIXEL_COLOR_DEPTH_BITS - i));
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previous_dmadesc_a = &dmadesc_a[current_dmadescriptor_offset];
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if (double_buffering_enabled) {
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link_dma_desc(&dmadesc_b[current_dmadescriptor_offset], previous_dmadesc_b, &(fb_malloc_ptr[1].rowbits[i].data), sizeof(rowBitStruct) * (PIXEL_COLOR_DEPTH_BITS - i));
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previous_dmadesc_b = &dmadesc_b[current_dmadescriptor_offset]; }
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current_dmadescriptor_offset++;
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} // end color depth ^ 2 linked list
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} // end color depth loop
|
|
|
|
} // end frame rows
|
|
|
|
#if SERIAL_DEBUG
|
|
Serial.printf("configureDMA(): Configured LL structure. %d DMA Linked List descriptors populated.\r\n", current_dmadescriptor_offset);
|
|
|
|
if ( desccount != current_dmadescriptor_offset)
|
|
{
|
|
Serial.printf("configureDMA(): ERROR! Expected descriptor count of %d != actual DMA descriptors of %d!\r\n", desccount, current_dmadescriptor_offset);
|
|
}
|
|
#endif
|
|
|
|
dmadesc_a[desccount-1].eof = 1;
|
|
dmadesc_a[desccount-1].qe.stqe_next=(lldesc_t*)&dmadesc_a[0];
|
|
|
|
//End markers for DMA LL
|
|
if (double_buffering_enabled) {
|
|
dmadesc_b[desccount-1].eof = 1;
|
|
dmadesc_b[desccount-1].qe.stqe_next=(lldesc_t*)&dmadesc_b[0];
|
|
} else {
|
|
dmadesc_b = dmadesc_a; // link to same 'a' buffer
|
|
}
|
|
|
|
|
|
/*
|
|
//End markers
|
|
dmadesc_a[desccount-1].eof = 1;
|
|
dmadesc_b[desccount-1].eof = 1;
|
|
dmadesc_a[desccount-1].qe.stqe_next=(lldesc_t*)&dmadesc_a[0];
|
|
dmadesc_b[desccount-1].qe.stqe_next=(lldesc_t*)&dmadesc_b[0];
|
|
*/
|
|
//Serial.printf("Performing I2S setup.\n");
|
|
|
|
i2s_parallel_config_t cfg={
|
|
.gpio_bus={r1_pin, g1_pin, b1_pin, r2_pin, g2_pin, b2_pin, lat_pin, oe_pin, a_pin, b_pin, c_pin, d_pin, e_pin, -1, -1, -1},
|
|
.gpio_clk=clk_pin,
|
|
.clkspeed_hz=ESP32_I2S_CLOCK_SPEED, //ESP32_I2S_CLOCK_SPEED, // formula used is 80000000L/(cfg->clkspeed_hz + 1), must result in >=2. Acceptable values 26.67MHz, 20MHz, 16MHz, 13.34MHz...
|
|
.bits=ESP32_I2S_DMA_MODE, //ESP32_I2S_DMA_MODE,
|
|
.bufa=0,
|
|
.bufb=0,
|
|
desccount,
|
|
desccount,
|
|
dmadesc_a,
|
|
dmadesc_b
|
|
};
|
|
|
|
//Setup I2S
|
|
i2s_parallel_setup_without_malloc(&I2S1, &cfg);
|
|
|
|
#if SERIAL_DEBUG
|
|
Serial.println("configureDMA(): DMA configuration completed on I2S1.\r\n");
|
|
#endif
|
|
|
|
#if SERIAL_DEBUG
|
|
Serial.println("DMA Memory Map after DMA LL allocations: ");
|
|
heap_caps_print_heap_info(MALLOC_CAP_DMA);
|
|
|
|
delay(1000);
|
|
#endif
|
|
|
|
} // end initMatrixDMABuff
|
|
|
|
|
|
/* 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
|
|
* don't accidently 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.
|
|
*
|
|
* Critical dependency: That 'updateMatrixDMABuffer(uint8_t red, uint8_t green, uint8_t blue)' has been run at least once over the
|
|
* entire frameBuffer to ensure all the non R,G,B bitmasks are in place (i.e. like OE, Address Lines etc.)
|
|
*
|
|
* Note: If you change the brightness with setBrightness() you MUST then clearScreen() and repaint / flush the entire framebuffer.
|
|
*/
|
|
//#define GO_FOR_SPEED 1
|
|
|
|
#ifdef GO_FOR_SPEED
|
|
/* Update a specific co-ordinate in the DMA buffer */
|
|
void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16_t y_coord, uint8_t red, uint8_t green, uint8_t blue)
|
|
{
|
|
|
|
// Check that the co-ordinates are within range, or it'll break everything big time.
|
|
// Valid co-ordinates are from 0 to (MATRIX_XXXX-1)
|
|
if ( x_coord < 0 || y_coord < 0 || x_coord >= MATRIX_WIDTH || y_coord >= MATRIX_HEIGHT) {
|
|
return;
|
|
}
|
|
|
|
// https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/
|
|
red = lumConvTab[red];
|
|
green = lumConvTab[green];
|
|
blue = lumConvTab[blue];
|
|
|
|
bool painting_top_frame = true;
|
|
if ( y_coord >= ROWS_PER_FRAME) // co-ords start at zero, y_coord = 15 = 16 (rows per frame)
|
|
{
|
|
y_coord -= ROWS_PER_FRAME; // Subtract the ROWS_PER_FRAME from the pixel co-ord to get the panel ROW (not really the 'y_coord' anymore)
|
|
painting_top_frame = false;
|
|
}
|
|
|
|
// 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
|
|
int rowBitStruct_x_coord_uint16_t_position = (x_coord % 2) ? (x_coord-1):(x_coord+1);
|
|
|
|
// Find the memory address for the malloc for this framebuffer row.
|
|
rowColorDepthStruct *fb_row_malloc_ptr = (rowColorDepthStruct *) matrix_row_framebuffer_malloc[y_coord];
|
|
|
|
for(int color_depth_idx=0; color_depth_idx<PIXEL_COLOR_DEPTH_BITS; color_depth_idx++) // color depth - 8 iterations
|
|
{
|
|
uint8_t mask = (1 << color_depth_idx); // PWM bit colour mask (max 8bits per pixel colour)
|
|
|
|
// The destination for the pixel bitstream
|
|
//rowBitStruct *p = &matrix_framebuffer_malloc_1[back_buffer_id].rowdata[y_coord].rowbits[color_depth_idx]; //matrixUpdateFrames location to write to uint16_t's
|
|
// Get the contents at this address, cast as a rowColorDepthStruct
|
|
//rowBitStruct *p = &fb_row_malloc_ptr[back_buffer_id].rowbits[color_depth_idx]; //matrixUpdateFrames location to write to uint16_t's
|
|
uint16_t &v = fb_row_malloc_ptr[back_buffer_id].rowbits[color_depth_idx].data[rowBitStruct_x_coord_uint16_t_position];
|
|
|
|
//int v=0; // the output bitstream
|
|
|
|
if (painting_top_frame) // Painting to pixel in the top half of the HUB75 panel use the R1, B1 and G1 pins
|
|
{
|
|
// Set the colour of the pixel of interest
|
|
// https://stackoverflow.com/questions/47981/how-do-you-set-clear-and-toggle-a-single-bit
|
|
if (red & mask) { v|=BIT_R1; } else { v &= ~(BIT_R1); }
|
|
if (green & mask) { v|=BIT_G1; } else { v &= ~(BIT_G1); }
|
|
if (blue & mask) { v|=BIT_B1; } else { v &= ~(BIT_B1); }
|
|
}
|
|
else
|
|
{ // Paint to a pixel in the bottom half
|
|
|
|
if (red & mask) { v|=BIT_R2; } else { v &= ~(BIT_R2); }
|
|
if (green & mask) { v|=BIT_G2; } else { v &= ~(BIT_G2); }
|
|
if (blue & mask) { v|=BIT_B2; } else { v &= ~(BIT_B2); }
|
|
|
|
} // paint
|
|
|
|
// 16 bit parallel mode
|
|
//Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering
|
|
//p->data[rowBitStruct_x_coord_uint16_t_position] = v;
|
|
// NOTE: No need to do this as 'v' is now a reference directly to the frameStruct
|
|
|
|
} // color depth loop (8)
|
|
|
|
} // updateMatrixDMABuffer (specific co-ords change)
|
|
|
|
#else
|
|
|
|
/* Update a specific co-ordinate in the DMA buffer */
|
|
/* Original version were we re-create the bitstream from scratch for each x,y co-ordinate / pixel changed. Slightly slower. */
|
|
void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16_t y_coord, uint8_t red, uint8_t green, uint8_t blue)
|
|
{
|
|
if ( !everything_OK ) {
|
|
|
|
#if SERIAL_DEBUG
|
|
Serial.println("Cannot updateMatrixDMABuffer as setup failed!");
|
|
#endif
|
|
|
|
return;
|
|
}
|
|
|
|
/* 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.
|
|
|
|
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'
|
|
|
|
*/
|
|
red = lumConvTab[red];
|
|
green = lumConvTab[green];
|
|
blue = lumConvTab[blue];
|
|
|
|
|
|
/* 1) Check that the co-ordinates are within range, or it'll break everything big time.
|
|
* Valid co-ordinates are from 0 to (MATRIX_XXXX-1)
|
|
*/
|
|
if ( x_coord < 0 || y_coord < 0 || x_coord >= MATRIX_WIDTH || y_coord >= MATRIX_HEIGHT) {
|
|
return;
|
|
}
|
|
|
|
/* 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
|
|
* and this reflects the parallel in-DMA-memory data structure of uint16_t's that are getting
|
|
* 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.
|
|
*
|
|
* 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
|
|
* data.
|
|
*/
|
|
bool painting_top_frame = true;
|
|
if ( y_coord >= ROWS_PER_FRAME) // co-ords start at zero, y_coord = 15 = 16 (rows per frame)
|
|
{
|
|
y_coord -= ROWS_PER_FRAME; // Subtract the ROWS_PER_FRAME from the pixel co-ord to get the panel ROW (not really the 'y_coord' anymore)
|
|
painting_top_frame = false;
|
|
}
|
|
|
|
// We need to update the correct uint16_t in the rowBitStruct array, that gets sent out in parallel
|
|
int rowBitStruct_x_coord_uint16_t_position = (x_coord % 2) ? (x_coord-1):(x_coord+1);
|
|
|
|
for(int color_depth_idx=0; color_depth_idx<PIXEL_COLOR_DEPTH_BITS; color_depth_idx++) // color depth - 8 iterations
|
|
{
|
|
int mask = (1 << color_depth_idx); // 24 bit color
|
|
|
|
// The destination for the pixel bitstream
|
|
//rowBitStruct *p = &matrix_framebuffer_malloc_1[back_buffer_id].rowdata[y_coord].rowbits[color_depth_idx]; //matrixUpdateFrames location to write to uint16_t's
|
|
|
|
// Find the memory address for the malloc for this framebuffer row.
|
|
rowColorDepthStruct *fb_row_malloc_ptr = (rowColorDepthStruct *) matrix_row_framebuffer_malloc[y_coord];
|
|
// Get the contents at this address, cast as a rowColorDepthStruct
|
|
rowBitStruct *p = &fb_row_malloc_ptr[back_buffer_id].rowbits[color_depth_idx]; //matrixUpdateFrames location to write to uint16_t's
|
|
|
|
|
|
|
|
// int v = p->data[rowBitStruct_x_coord_uint16_t_position]; // persist what we already have
|
|
int v=0; // the output bitstream
|
|
|
|
// if there is no latch to hold address, output ADDX lines directly to GPIO and latch data at end of cycle
|
|
int gpioRowAddress = y_coord;
|
|
|
|
// normally output current rows ADDX, special case for LSB, output previous row's ADDX (as previous row is being displayed for one latch cycle)
|
|
if(color_depth_idx == 0)
|
|
gpioRowAddress = y_coord-1;
|
|
|
|
if (gpioRowAddress & 0x01) v|=BIT_A; // 1
|
|
if (gpioRowAddress & 0x02) v|=BIT_B; // 2
|
|
if (gpioRowAddress & 0x04) v|=BIT_C; // 4
|
|
if (gpioRowAddress & 0x08) v|=BIT_D; // 8
|
|
if (gpioRowAddress & 0x10) v|=BIT_E; // 16
|
|
|
|
// need to disable OE after latch to hide row transition
|
|
if((x_coord) == 0 ) v|=BIT_OE;
|
|
|
|
// drive latch while shifting out last bit of RGB data
|
|
if((x_coord) == PIXELS_PER_ROW-1) v|=BIT_LAT;
|
|
|
|
// need to turn off OE one clock before latch, otherwise can get ghosting
|
|
if((x_coord)==PIXELS_PER_ROW-2) v|=BIT_OE;
|
|
|
|
// turn off OE after brightness value is reached when displaying MSBs
|
|
// MSBs always output normal brightness
|
|
// LSB (!color_depth_idx) outputs normal brightness as MSB from previous row is being displayed
|
|
if((color_depth_idx > lsbMsbTransitionBit || !color_depth_idx) && ((x_coord) >= brightness)) v|=BIT_OE; // For 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(color_depth_idx && color_depth_idx <= lsbMsbTransitionBit) {
|
|
// divide brightness in half for each bit below lsbMsbTransitionBit
|
|
int lsbBrightness = brightness >> (lsbMsbTransitionBit - color_depth_idx + 1);
|
|
if((x_coord) >= lsbBrightness) v|=BIT_OE; // For Brightness
|
|
}
|
|
|
|
/*
|
|
// Development / testing code only.
|
|
Serial.printf("r value of %d, color depth: %d, mask: %d\r\n", red, color_depth_idx, mask);
|
|
if (red & mask) { Serial.println("Success - Binary"); v|=BIT_R1; }
|
|
Serial.printf("val2pwm r value: %d\r\n", val2PWM(red));
|
|
if (val2PWM(red) & mask) { Serial.println("Success - PWM"); v|=BIT_R2; }
|
|
*/
|
|
|
|
|
|
if (painting_top_frame)
|
|
{ // Need to copy what the RGB status is for the bottom pixels
|
|
|
|
// Set the color of the pixel of interest
|
|
if (green & mask) { v|=BIT_G1; }
|
|
if (blue & mask) { v|=BIT_B1; }
|
|
if (red & mask) { v|=BIT_R1; }
|
|
|
|
// Persist what was painted to the other half of the frame equiv. pixel
|
|
if (p->data[rowBitStruct_x_coord_uint16_t_position] & BIT_R2)
|
|
v|=BIT_R2;
|
|
|
|
if (p->data[rowBitStruct_x_coord_uint16_t_position] & BIT_G2)
|
|
v|=BIT_G2;
|
|
|
|
if (p->data[rowBitStruct_x_coord_uint16_t_position] & BIT_B2)
|
|
v|=BIT_B2;
|
|
}
|
|
else
|
|
{ // Do it the other way around
|
|
|
|
// Color to set
|
|
if (red & mask) { v|=BIT_R2; }
|
|
if (green & mask) { v|=BIT_G2; }
|
|
if (blue & mask) { v|=BIT_B2; }
|
|
|
|
// Copy / persist
|
|
if (p->data[rowBitStruct_x_coord_uint16_t_position] & BIT_R1)
|
|
v|=BIT_R1;
|
|
|
|
if (p->data[rowBitStruct_x_coord_uint16_t_position] & BIT_G1)
|
|
v|=BIT_G1;
|
|
|
|
if (p->data[rowBitStruct_x_coord_uint16_t_position] & BIT_B1)
|
|
v|=BIT_B1;
|
|
|
|
} // paint
|
|
|
|
// 16 bit parallel mode
|
|
//Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering
|
|
/*
|
|
if(x_coord%2){
|
|
p->data[(x_coord)-1] = v;
|
|
} else {
|
|
p->data[(x_coord)+1] = v;
|
|
} // end reordering
|
|
*/
|
|
|
|
// 16 bit parallel mode
|
|
p->data[rowBitStruct_x_coord_uint16_t_position] = v;
|
|
|
|
|
|
} // color depth loop (8)
|
|
|
|
} // updateMatrixDMABuffer (specific co-ords change)
|
|
#endif
|
|
|
|
|
|
/* Update the entire buffer with a single specific colour - quicker */
|
|
void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(uint8_t red, uint8_t green, uint8_t blue)
|
|
{
|
|
if ( !everything_OK ) return;
|
|
|
|
/* https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/ */
|
|
/*
|
|
red = val2PWM(red);
|
|
green = val2PWM(green);
|
|
blue = val2PWM(blue);
|
|
*/
|
|
red = lumConvTab[red];
|
|
green = lumConvTab[green];
|
|
blue = lumConvTab[blue];
|
|
|
|
for (unsigned int matrix_frame_parallel_row = 0; matrix_frame_parallel_row < ROWS_PER_FRAME; matrix_frame_parallel_row++) // half height - 16 iterations
|
|
{
|
|
for(int color_depth_idx=0; color_depth_idx<PIXEL_COLOR_DEPTH_BITS; color_depth_idx++) // color depth - 8 iterations
|
|
{
|
|
uint16_t mask = (1 << color_depth_idx); // 24 bit color
|
|
|
|
// The destination for the pixel bitstream
|
|
//rowBitStruct *p = &matrix_framebuffer_malloc_1[back_buffer_id].rowdata[matrix_frame_parallel_row].rowbits[color_depth_idx]; //matrixUpdateFrames location to write to uint16_t's
|
|
rowColorDepthStruct *fb_row_malloc_ptr = (rowColorDepthStruct *) matrix_row_framebuffer_malloc[matrix_frame_parallel_row];
|
|
//Serial.printf("Accessing fb address: %d\r\n", fb_row_malloc_ptr);
|
|
|
|
rowBitStruct *p = &fb_row_malloc_ptr[back_buffer_id].rowbits[color_depth_idx]; //matrixUpdateFrames location to write to uint16_t's
|
|
|
|
for(int x_coord=0; x_coord < MATRIX_WIDTH; x_coord++) // row pixel width 64 iterations
|
|
{
|
|
|
|
int v=0; // the output bitstream
|
|
|
|
// if there is no latch to hold address, output ADDX lines directly to GPIO and latch data at end of cycle
|
|
int gpioRowAddress = matrix_frame_parallel_row;
|
|
|
|
// normally output current rows ADDX, special case for LSB, output previous row's ADDX (as previous row is being displayed for one latch cycle)
|
|
if(color_depth_idx == 0)
|
|
gpioRowAddress = matrix_frame_parallel_row-1;
|
|
|
|
if (gpioRowAddress & 0x01) v|=BIT_A; // 1
|
|
if (gpioRowAddress & 0x02) v|=BIT_B; // 2
|
|
if (gpioRowAddress & 0x04) v|=BIT_C; // 4
|
|
if (gpioRowAddress & 0x08) v|=BIT_D; // 8
|
|
if (gpioRowAddress & 0x10) v|=BIT_E; // 16
|
|
|
|
|
|
/* ORIG
|
|
// need to disable OE after latch to hide row transition
|
|
if((x_coord) == 0) v|=BIT_OE;
|
|
|
|
// drive latch while shifting out last bit of RGB data
|
|
if((x_coord) == PIXELS_PER_LATCH-1) v|=BIT_LAT;
|
|
|
|
// need to turn off OE one clock before latch, otherwise can get ghosting
|
|
if((x_coord)==PIXELS_PER_LATCH-1) v|=BIT_OE;
|
|
*/
|
|
|
|
// need to disable OE after latch to hide row transition
|
|
if((x_coord) == 0 ) v|=BIT_OE;
|
|
|
|
// drive latch while shifting out last bit of RGB data
|
|
if((x_coord) == PIXELS_PER_ROW-1) v|=BIT_LAT;
|
|
|
|
// need to turn off OE one clock before latch, otherwise can get ghosting
|
|
if((x_coord)==PIXELS_PER_ROW-2) v|=BIT_OE;
|
|
|
|
|
|
// turn off OE after brightness value is reached when displaying MSBs
|
|
// MSBs always output normal brightness
|
|
// LSB (!color_depth_idx) outputs normal brightness as MSB from previous row is being displayed
|
|
if((color_depth_idx > lsbMsbTransitionBit || !color_depth_idx) && ((x_coord) >= brightness)) v|=BIT_OE; // For 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(color_depth_idx && color_depth_idx <= lsbMsbTransitionBit) {
|
|
// divide brightness in half for each bit below lsbMsbTransitionBit
|
|
int lsbBrightness = brightness >> (lsbMsbTransitionBit - color_depth_idx + 1);
|
|
if((x_coord) >= lsbBrightness) v|=BIT_OE; // For Brightness
|
|
}
|
|
|
|
// Top and bottom matrix MATRIX_ROWS_IN_PARALLEL half colours
|
|
if (green & mask) { v|=BIT_G1; v|=BIT_G2; }
|
|
if (blue & mask) { v|=BIT_B1; v|=BIT_B2; }
|
|
if (red & mask) { v|=BIT_R1; v|=BIT_R2; }
|
|
|
|
// 16 bit parallel mode
|
|
//Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering
|
|
if(x_coord%2) {
|
|
p->data[(x_coord)-1] = v;
|
|
} else {
|
|
p->data[(x_coord)+1] = v;
|
|
} // end reordering
|
|
|
|
} // end x_coord iteration
|
|
} // colour depth loop (8)
|
|
} // end row iteration
|
|
|
|
} // updateMatrixDMABuffer (full frame paint)
|
|
|
|
/**
|
|
* pre-init procedures for specific drivers
|
|
*
|
|
*/
|
|
void MatrixPanel_I2S_DMA::shiftDriver(const shift_driver _drv, const int dma_r1_pin, const int dma_g1_pin, const int dma_b1_pin, const int dma_r2_pin, const int dma_g2_pin, const int dma_b2_pin, const int dma_a_pin, const int dma_b_pin, const int dma_c_pin, const int dma_d_pin, const int dma_e_pin, const int dma_lat_pin, const int dma_oe_pin, const int dma_clk_pin){
|
|
switch (_drv){
|
|
case FM6124:
|
|
case FM6126A:
|
|
{
|
|
#if SERIAL_DEBUG
|
|
Serial.println( F("MatrixPanel_I2S_DMA - initializing FM6124 driver..."));
|
|
#endif
|
|
int C12[16] = {0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
|
|
int C13[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0};
|
|
|
|
pinMode(dma_r1_pin, OUTPUT);
|
|
pinMode(dma_g1_pin, OUTPUT);
|
|
pinMode(dma_b1_pin, OUTPUT);
|
|
pinMode(dma_r2_pin, OUTPUT);
|
|
pinMode(dma_g2_pin, OUTPUT);
|
|
pinMode(dma_b2_pin, OUTPUT);
|
|
pinMode(dma_a_pin, OUTPUT);
|
|
pinMode(dma_b_pin, OUTPUT);
|
|
pinMode(dma_c_pin, OUTPUT);
|
|
pinMode(dma_d_pin, OUTPUT);
|
|
pinMode(dma_e_pin, OUTPUT);
|
|
pinMode(dma_clk_pin, OUTPUT);
|
|
pinMode(dma_lat_pin, OUTPUT);
|
|
pinMode(dma_oe_pin, OUTPUT);
|
|
|
|
// Send Data to control register 11
|
|
digitalWrite(dma_oe_pin, HIGH); // Display reset
|
|
digitalWrite(dma_lat_pin, LOW);
|
|
digitalWrite(dma_clk_pin, LOW);
|
|
for (int l = 0; l < MATRIX_WIDTH; l++){
|
|
int y = l % 16;
|
|
digitalWrite(dma_r1_pin, LOW);
|
|
digitalWrite(dma_g1_pin, LOW);
|
|
digitalWrite(dma_b1_pin, LOW);
|
|
digitalWrite(dma_r2_pin, LOW);
|
|
digitalWrite(dma_g2_pin, LOW);
|
|
digitalWrite(dma_b2_pin, LOW);
|
|
|
|
if (C12[y] == 1){
|
|
digitalWrite(dma_r1_pin, HIGH);
|
|
digitalWrite(dma_g1_pin, HIGH);
|
|
digitalWrite(dma_b1_pin, HIGH);
|
|
digitalWrite(dma_r2_pin, HIGH);
|
|
digitalWrite(dma_g2_pin, HIGH);
|
|
digitalWrite(dma_b2_pin, HIGH);
|
|
}
|
|
|
|
if (l > MATRIX_WIDTH - 12){
|
|
digitalWrite(dma_lat_pin, HIGH);
|
|
} else {
|
|
digitalWrite(dma_lat_pin, LOW);
|
|
}
|
|
|
|
digitalWrite(dma_clk_pin, HIGH);
|
|
digitalWrite(dma_clk_pin, LOW);
|
|
}
|
|
|
|
digitalWrite(dma_lat_pin, LOW);
|
|
digitalWrite(dma_clk_pin, LOW);
|
|
|
|
// Send Data to control register 12
|
|
for (int l = 0; l < MATRIX_WIDTH; l++){
|
|
int y = l % 16;
|
|
digitalWrite(dma_r1_pin, LOW);
|
|
digitalWrite(dma_g1_pin, LOW);
|
|
digitalWrite(dma_b1_pin, LOW);
|
|
digitalWrite(dma_r2_pin, LOW);
|
|
digitalWrite(dma_g2_pin, LOW);
|
|
digitalWrite(dma_b2_pin, LOW);
|
|
|
|
if (C13[y] == 1){
|
|
digitalWrite(dma_r1_pin, HIGH);
|
|
digitalWrite(dma_g1_pin, HIGH);
|
|
digitalWrite(dma_b1_pin, HIGH);
|
|
digitalWrite(dma_r2_pin, HIGH);
|
|
digitalWrite(dma_g2_pin, HIGH);
|
|
digitalWrite(dma_b2_pin, HIGH);
|
|
}
|
|
|
|
if (l > MATRIX_WIDTH - 13){
|
|
digitalWrite(dma_lat_pin, HIGH);
|
|
} else {
|
|
digitalWrite(dma_lat_pin, LOW);
|
|
}
|
|
digitalWrite(dma_clk_pin, HIGH);
|
|
digitalWrite(dma_clk_pin, LOW);
|
|
}
|
|
|
|
digitalWrite(dma_lat_pin, LOW);
|
|
digitalWrite(dma_clk_pin, LOW);
|
|
break;
|
|
}
|
|
case SHIFT:
|
|
default:
|
|
break;
|
|
}
|
|
}
|