[参考译文] TMS320F280049C：使用 tms320f280049c 使 WS2812B 新像素 LED 闪烁

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1520167/tms320f280049c-blink-the-ws2812b-neo-pixel-leds-using-tms320f280049c

工具/软件：

我正在使用 TMS320F280049C 微控制器,我想使用 Ws2812B neo 像素 led 来点亮我所需的颜色,并在我的代码它打开所有 数量提到的 LED 的白色,而不是我所需的颜色。 我会附上代码。 请帮助我尽快解决此问题。 谢谢你。

#include "device.h"
#include "gpio.h"

#define NEOPIXEL_PIN  4
#define NUM_LEDS      2               // Number of LEDs
#define BLINK_DELAY   500000          // 500ms delay

// GRB color values (0-255)
#define RED           0, 255, 0       // Green component for red color
#define GREEN         255, 0, 0       // Red component for green color
#define BLUE          0, 0, 255       // Blue component

// System clock frequency in MHz for cycle calculations
#define SYS_FREQ_MHZ (DEVICE_SYSCLK_FREQ / 1000000)

// Timing parameters (in microseconds)
#define T0H           0.4f            // High time for '0' bit
#define T1H           0.8f            // High time for '1' bit
#define T0L           0.85f           // Low time for '0' bit
#define T1L           0.45f           // Low time for '1' bit

// Convert timing to CPU cycles
#define CYCLES_PER_US SYS_FREQ_MHZ
#define T0H_CYCLES   (uint32_t)(T0H * CYCLES_PER_US)
#define T1H_CYCLES   (uint32_t)(T1H * CYCLES_PER_US)
#define T0L_CYCLES   (uint32_t)(T0L * CYCLES_PER_US)
#define T1L_CYCLES   (uint32_t)(T1L * CYCLES_PER_US)

void delay_cycles(uint32_t cycles) {
    while (cycles--) {
        __asm(" NOP");
    }
}

void send_neopixel_byte(uint8_t byte, uint16_t pin) {
    for (int i = 7; i >= 0; i--) {
        uint8_t bit_val = (byte >> i) & 1;
        
        GPIO_writePin(pin, 1);                // Signal start of bit
        
        if (bit_val) {
            delay_cycles(T1H_CYCLES - 2);     // High pulse for '1'
            GPIO_writePin(pin, 0);
            delay_cycles(T1L_CYCLES - 2);     // Low period for '1'
        } else {
            delay_cycles(T0H_CYCLES - 2);     // High pulse for '0'
            GPIO_writePin(pin, 0);
            delay_cycles(T0L_CYCLES - 2);     // Low period for '0'
        }
    }
}

void set_all_leds(uint8_t green, uint8_t red, uint8_t blue) {
    for (int j = 0; j < NUM_LEDS; j++) {
        send_neopixel_byte(green, NEOPIXEL_PIN);  // GRB order
        send_neopixel_byte(red, NEOPIXEL_PIN);
        send_neopixel_byte(blue, NEOPIXEL_PIN);
    }
    GPIO_writePin(NEOPIXEL_PIN, 0);   // Reset signal
    delay_us(60);                      // Hold low for 60µs
}

void main(void) {
    Device_init();
    Device_initGPIO();
    GPIO_setDirectionMode(NEOPIXEL_PIN, GPIO_DIR_MODE_OUT);

    while (1) {
        set_all_leds(GREEN);           // Green component for red color
        delay_us(BLINK_DELAY);
        set_all_leds(0, 0, 0);         // Turn off LEDs
        delay_us(BLINK_DELAY);
    }
}