ScStw/ESP32-HUB75-MatrixPanel-DMA
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Minor cleanup

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Minor cleanup to the contribution made by @vortigont . Move some of the special constants into specific #defined constants.
This commit is contained in:
mrfaptastic 2020-12-08 08:10:35 +00:00
parent 09dabb2e35
commit c425b9caa7
2 changed files with 42 additions and 25 deletions
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60
ESP32-HUB75-MatrixPanel-I2S-DMA.cpp
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@ -503,14 +503,14 @@ void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16_t y_coord
if (painting_top_frame)
{ // Need to copy what the RGB status is for the bottom pixels
v &= BITSMASK_RGB1; // reset R1G1B1 bits
v &= BITMASK_RGB1_CLEAR; // reset R1G1B1 bits
// 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; }
} else { // Do it the other way around
v &= BITSMASK_RGB2; // reset R2G2B2 bits
v &= BITMASK_RGB2_CLEAR; // reset R2G2B2 bits
// Color to set
if (red & mask) { v|=BIT_R2; }
if (green & mask) { v|=BIT_G2; }
@ -521,9 +521,10 @@ void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16_t y_coord
continue;
// update address/control bits
v &= BITSMASK_CTRL; // reset ABCDE,EO,LAT address bits
v &= BITMASK_CTRL_CLEAR; // reset ABCDE,EO,LAT address bits
uint16_t _y = color_depth_idx ? y_coord : y_coord -1;
v|=_y<<8; // shift row coord to match ABCDE bits from 8 to 12 and set bitvector
v|=_y << BITS_ADDR_OFFSET; // shift row coord to match ABCDE bits from bit positions 8 to 12 and set bitvector
// drive latch while shifting out last bit of RGB data
if((x_coord) == PIXELS_PER_ROW-1) v|=BIT_LAT;
@ -572,16 +573,21 @@ void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(uint8_t red, uint8_t green, uint
for(uint8_t color_depth_idx=0; color_depth_idx<PIXEL_COLOR_DEPTH_BITS; color_depth_idx++) // color depth - 8 iterations
{
// let's precalculate RGB1 and RGB2 bits than flood it over the entire DMA buffer
uint16_t RGBbitfield = 0;
uint16_t RGB_output_bits = 0;
uint8_t mask = (1 << color_depth_idx); // 24 bit color
RGBbitfield |= (bool)(blue & mask);
RGBbitfield <<= 1;
RGBbitfield |= (bool)(green & mask);
RGBbitfield <<= 1;
RGBbitfield |= (bool)(red & mask);
RGBbitfield |= RGBbitfield << 3; // now we should have 6 bits of RGB suitable for DMA buffer
//Serial.printf("Fill with: 0x%#06x\n", RGBbitfield);
/* Per the .h file, the order of the output RGB bits is:
* BIT_B2, BIT_G2, BIT_R2, BIT_B1, BIT_G1, BIT_R1 */
RGB_output_bits |= (bool)(blue & mask); // --B
RGB_output_bits <<= 1;
RGB_output_bits |= (bool)(green & mask); // -BG
RGB_output_bits <<= 1;
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
RGB_output_bits |= RGB_output_bits << BITS_RGB2_OFFSET; //BGRBGR
//Serial.printf("Fill with: 0x%#06x\n", RGB_output_bits);
// iterate rows
for (uint16_t matrix_frame_parallel_row = 0; matrix_frame_parallel_row < ROWS_PER_FRAME; matrix_frame_parallel_row++) // half height - 16 iterations
@ -594,19 +600,27 @@ void MatrixPanel_I2S_DMA::updateMatrixDMABuffer(uint8_t red, uint8_t green, uint
// iterate pixels in a row
if (fastmode){
for(uint16_t x_coord=0; x_coord < MATRIX_WIDTH; x_coord++){
uint16_t &v = p->data[(x_coord % 2) ? (x_coord-1):(x_coord+1)]; // take reference to bit vector
v &= BITSMASK_RGB12; // reset color bits
v |= RGBbitfield; // set new color bits
}
} else {
// Set ABCDE address bits vector
uint16_t _y = color_depth_idx ? matrix_frame_parallel_row : matrix_frame_parallel_row -1;
_y <<=8; // shift row y-coord to match ABCDE bits in vector from 8 to 12
for(uint16_t x_coord=0; x_coord < MATRIX_WIDTH; x_coord++) {
uint16_t &v = p->data[(x_coord % 2) ? (x_coord-1):(x_coord+1)]; // persist what we already have
v = RGBbitfield; // set colot bits and reset all others
uint16_t &v = p->data[(x_coord % 2) ? (x_coord-1):(x_coord+1)]; // take reference to bit vector
v &= BITMASK_RGB12_CLEAR; // reset color bits
v |= RGB_output_bits; // set new color bits
}
} else {
// Set ABCDE address bits vector
uint16_t _y = color_depth_idx ? matrix_frame_parallel_row : matrix_frame_parallel_row -1;
_y <<= BITS_ADDR_OFFSET; // shift row y-coord to match ABCDE bits in vector from 8 to 12
for(uint16_t x_coord=0; x_coord < MATRIX_WIDTH; x_coord++) {
// 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
uint16_t rowBitStruct_x_coord_uint16_t_position = (x_coord % 2) ? (x_coord-1):(x_coord+1);
uint16_t &v = p->data[rowBitStruct_x_coord_uint16_t_position]; // persist what we already have
v = RGB_output_bits; // set colot bits and reset all others
v|=_y; // set ABCDE address bits for current row
// drive latch while shifting out last bit of RGB data

11
ESP32-HUB75-MatrixPanel-I2S-DMA.h
View file

@ -84,11 +84,13 @@
/* Do not change. */
// 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 BIT_R1 (1<<0)
#define BIT_G1 (1<<1)
#define BIT_B1 (1<<2)
// Panel Lower half RGB
#define BITS_RGB2_OFFSET 3 // Start point of RGB_X2 bits
#define BIT_R2 (1<<3)
#define BIT_G2 (1<<4)
#define BIT_B2 (1<<5)
@ -98,16 +100,17 @@
#define BIT_OE (1<<7)
// Panel GPIO Pin Addresses (A, B, C, D etc..)
#define BITS_ADDR_OFFSET 8 // Start point of address bits
#define BIT_A (1<<8)
#define BIT_B (1<<9)
#define BIT_C (1<<10)
#define BIT_D (1<<11)
#define BIT_E (1<<12)
#define BITSMASK_RGB1 (0xfff8) // inverted bitmask for R1G1B1 bit in pixel vector
#define BITSMASK_RGB2 (0xffc7) // inverted bitmask for R2G2B2 bit in pixel vector
#define BITSMASK_RGB12 (0xffc0) // inverted bitmask for R1G1B1R2G2B2 bit in pixel vector
#define BITSMASK_CTRL (0xe03f) // inverted bitmask for control bits ABCDE,LAT,OE in pixel vector
#define BITMASK_RGB1_CLEAR (0xfff8) // inverted bitmask for R1G1B1 bit in pixel vector
#define BITMASK_RGB2_CLEAR (0xffc7) // inverted bitmask for R2G2B2 bit in pixel vector
#define BITMASK_RGB12_CLEAR (0xffc0) // inverted bitmask for R1G1B1R2G2B2 bit in pixel vector
#define BITMASK_CTRL_CLEAR (0xe03f) // inverted bitmask for control bits ABCDE,LAT,OE in pixel vector
// RGB Panel Constants / Calculated Values
#define COLOR_CHANNELS_PER_PIXEL 3