Here's my code if anyone wants to take a look. It will currently only light up to 9 LEDs depending on what LED_COUNT is for reasons I don't understand. Color git written correctly once but it seems like I brake the DMA in the timer_callback as the colors change seemingly randomly.
Code:
#include <stdio.h>#include <stdlib.h>#include <string.h>#include "pico/stdlib.h"#include "pico/sem.h"#include "hardware/pio.h"#include "hardware/dma.h"#include "hardware/irq.h"#include "hardware/spi.h"#include "ws2812.pio.h"#define LED_PIN PICO_DEFAULT_LED_PIN#define TEST_LED_0 4#define TEST_LED_1 5#define SS_CLK 14#define SS_D 15#define SS_LAT 16#define SS_BLANK 17#define LED_0 10#define UART0_TX 0#define UART0_RX 1#define LED_COUNT 35#define STRIP_COUNT 2volatile bool tiger_1;volatile int led_on_timer =0;volatile int piezo_trig_cnt =0;bool update_flag = false;uint dma_chan[STRIP_COUNT];bool timer_callback (struct repeating_timer *t) { for (int i = 0; i < STRIP_COUNT; i++) { while (!dma_channel_is_busy(dma_chan[i])) { // Wait for the DMA channel to complete the transfer printf("I AM STUCK!! \n"); } } for (int i = 0; i < STRIP_COUNT; i++) { dma_channel_start(dma_chan[i]); } update_flag = true; return true;}uint32_t led_colors[STRIP_COUNT][LED_COUNT];void setup_dma(PIO pio, uint sm, uint dma_chan, const uint32_t *source_addr) { dma_channel_config c = dma_channel_get_default_config(dma_chan); channel_config_set_transfer_data_size(&c, DMA_SIZE_32); channel_config_set_read_increment(&c, true); channel_config_set_write_increment(&c, false); dma_channel_configure(dma_chan, &c, &pio->txf[sm], source_addr, LED_COUNT, false);}void setup_leds() { for (int i = 0; i < STRIP_COUNT; i++) { for (int j = 0; j < LED_COUNT; j++) { led_colors[i][j] = 0x0F0000; // RBG Color } }}int main() { stdio_init_all(); gpio_init(TEST_LED_0); gpio_set_dir(TEST_LED_0, true); gpio_init(TEST_LED_1); gpio_set_dir(TEST_LED_1, true); gpio_init(LED_PIN); gpio_set_dir(LED_PIN, true); int count = 0; // Initialize hardware timer struct repeating_timer timer; PIO pio = pio0; uint offset = pio_add_program(pio, &ws2812_program); setup_leds(); for (int i = 0; i < STRIP_COUNT; i++) { uint sm = pio_claim_unused_sm(pio, true); ws2812_program_init(pio, sm, offset, i + LED_0, 800000, false); // Assuming GPIO pins 0-3 for the 4 strips dma_chan[i] = dma_claim_unused_channel(true); setup_dma(pio, sm, dma_chan[i], led_colors[i]); dma_channel_start(dma_chan[i]); } sleep_ms(500); // Initialize the timer with the given period and enable interrupts add_repeating_timer_ms(-2000, timer_callback, NULL, &timer); //50 fps while(true){ gpio_put(TEST_LED_0, 1); gpio_put(TEST_LED_1, update_flag); gpio_put(LED_PIN, led_on_timer); if (update_flag) { for (int i = 0; i < STRIP_COUNT; i++) { for (int j = 0; j < LED_COUNT; j++) { led_colors[i][j] = 0x000F00; // RGB Color } } update_flag = false; } sleep_ms(400); }}Statistics: Posted by forshee9283 — Thu Jun 13, 2024 12:07 am