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#include "InovaLedDisplay.h"
#include <cstring>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
InovaLedDisplay::InovaLedDisplay(uint8_t r0, uint8_t g0, uint8_t r1, uint8_t g1, uint8_t r2, uint8_t g2, uint8_t clk, uint8_t latchParam, uint8_t oeParam, uint8_t addr0Param, uint8_t addr1Param, uint8_t addr2Param) : Adafruit_GFX(NUM_COL, NUM_ROW){
latch = (gpio_num_t) latchParam;
oe = (gpio_num_t) oeParam;
addr0 = (gpio_num_t) addr0Param;
addr1 = (gpio_num_t) addr1Param;
addr2 = (gpio_num_t) addr2Param;
esp_err_t ret;
spi_bus_config_t buscfg;
memset(&buscfg, 0, sizeof(spi_bus_config_t));
buscfg.miso_io_num=g0;
buscfg.mosi_io_num=r0;
buscfg.quadwp_io_num=r1;
buscfg.quadhd_io_num=g1;
buscfg.data4_io_num=r2;
buscfg.data5_io_num=g2;
buscfg.data6_io_num=37;
buscfg.data7_io_num=38;
buscfg.sclk_io_num=clk;
buscfg.max_transfer_sz=3*600*2*8;
buscfg.flags=SPICOMMON_BUSFLAG_OCTAL;
spi_device_interface_config_t devcfg;
memset(&devcfg, 0, sizeof(spi_device_interface_config_t));
devcfg.clock_speed_hz=1*1000*1000; //Clock out at 1 MHz
devcfg.mode=0; //SPI mode 0
devcfg.spics_io_num=-1; //CS pin
devcfg.queue_size=1; //Only one transaction at a time
devcfg.flags=SPI_DEVICE_HALFDUPLEX; //Needed to use both data lines for output
//Initialize the SPI bus and attach our device handle
ret=spi_bus_initialize(SPI2_HOST, &buscfg, SPI_DMA_CH_AUTO);
ESP_ERROR_CHECK(ret);
ret=spi_bus_add_device(SPI2_HOST, &devcfg, &spi);
ESP_ERROR_CHECK(ret);
gpio_set_direction(latch, GPIO_MODE_OUTPUT);
gpio_set_direction(oe, GPIO_MODE_OUTPUT);
gpio_set_direction(addr0, GPIO_MODE_OUTPUT);
gpio_set_direction(addr1, GPIO_MODE_OUTPUT);
gpio_set_direction(addr2, GPIO_MODE_OUTPUT);
}
void InovaLedDisplay::drawPixel(int16_t x, int16_t y, uint16_t color) {
if(x < 0 || x >= _width || y < 0 || y >= _height) return;
// Adafruit GFX color is 16-bit 5-6-5 rgb
// We store only 2-bit rg, so we assume any amount of red or green wants that color
uint8_t r, g, c;
r = color >> 11; // RRRRRggggggbbbbb
g = (color >> 5) & 0x3F; // rrrrrGGGGGGbbbbb
c = 0;
if(g > 0) c += 1;
if(r > 0) c += 2;
c = c << 6;
// We store the 3 segments of the display 8-bit ints ready to transfer via 8-bit parallel SPI
// So 2 bits are wasted per byte, but hopefully it's worth it for transfer speed
// b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7
// [0][0] r(0,0) g(0,0) r(0,8) g(0,8) r(0,16) g(0,16) --- --- [0][1] r(1,0) g(1,0) r(1,8) g(1,8) r(1,16) g(1,16) --- --- [...]
// [1][0] r(0,1) g(0,1) r(0,9) g(0,9) r(0,17) g(0,17) --- --- [1][1] r(1,1) g(1,1) r(1,9) g(1,9) r(1,17) g(1,17) --- --- [...]
// [...]
uint8_t bitwiseOffset = (y / 8) * 2;
uint8_t i = backBufferIndex;
displayBuffer[i][y % 8][x] = displayBuffer[i][y % 8][x] & ~(0b11000000 >> bitwiseOffset); // clear this pixel (note the bitwise inversion)
displayBuffer[i][y % 8][x] = displayBuffer[i][y % 8][x] | (c >> bitwiseOffset); // write color to pixel
}
void InovaLedDisplay::swapBuffer(void) {
shouldSwapBuffer = true;
while(shouldSwapBuffer) {
vTaskDelay(1 / portTICK_PERIOD_MS);
}
}
void InovaLedDisplay::runDisplay(void) {
TickType_t xLastWakeTime;
const TickType_t xFrequency = 1 / portTICK_PERIOD_MS;
xLastWakeTime = xTaskGetTickCount();
spi_transaction_t t;
uint8_t current_row = 0;
esp_err_t ret;
run = true;
while(run) {
vTaskDelayUntil(&xLastWakeTime, xFrequency);
memset(&t, 0, sizeof(t));
t.length = _width;
t.tx_buffer = &displayBuffer[1 - backBufferIndex][current_row];
t.flags = SPI_TRANS_MODE_OCT; // output on eight data lines (six utilized). Even bits go to GREEN, odd to RED
ret = spi_device_polling_transmit(spi, &t);
ESP_ERROR_CHECK(ret);
gpio_set_level(latch, 0);
gpio_set_level(oe, 1);
gpio_set_level(addr0, 1 & current_row);
gpio_set_level(addr1, 1 & (current_row >> 1));
gpio_set_level(addr2, 1 & (current_row >> 2));
gpio_set_level(latch, 1);
gpio_set_level(oe, 0);
if(++current_row == ROWS_PER_SEGMENT) {
current_row = 0;
if(shouldSwapBuffer) {
backBufferIndex++;
backBufferIndex = backBufferIndex % 2;
shouldSwapBuffer = false;
}
}
}
}
void InovaLedDisplay::stopDisplay(void) {
run = false;
}
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