一段使用STM32f103c8t6单片机开发板控制ws2812呼吸灯的代码

好的，以下是控制WS2812呼吸灯的STM32f103c8t6单片机开发板代码示例。请注意，此示例使用SysTick定时器来实现呼吸灯效果。

#include "stm32f10x.h"

#define LED_NUM 1

void delay_us(uint32_t us) {
  uint32_t count = us * (SystemCoreClock / 1000000);
  while(count--);
}

void delay_ms(uint32_t ms) {
  uint32_t count = ms * (SystemCoreClock / 1000);
  while(count--);
}

void ws2812_set_color(uint8_t *buffer, uint8_t r, uint8_t g, uint8_t b) {
  uint32_t temp = 0;
  for (int i = 0; i < 8; i++) {
    temp <<= 3;
    if (g & 0x80) {
      temp |= 0b110;
    } else {
      temp |= 0b100;
    }
    g <<= 1;
  }
  for (int i = 0; i < 8; i++) {
    temp <<= 3;
    if (r & 0x80) {
      temp |= 0b110;
    } else {
      temp |= 0b100;
    }
    r <<= 1;
  }
  for (int i = 0; i < 8; i++) {
    temp <<= 3;
    if (b & 0x80) {
      temp |= 0b110;
    } else {
      temp |= 0b100;
    }
    b <<= 1;
  }
  for (int i = 0; i < 24; i++) {
    if (temp & 0x800000) {
      buffer[i / 8] |= 0x80 >> i % 8;
    }
    temp <<= 1;
  }
}

void ws2812_show(uint8_t *buffer) {
  TIM_Cmd(TIM2, DISABLE);
  for (int i = 0; i < LED_NUM * 24; i++) {
    if (buffer[i / 8] & (0x80 >> i % 8)) {
      GPIO_SetBits(GPIOA, GPIO_Pin_1);
      delay_us(350);
      GPIO_ResetBits(GPIOA, GPIO_Pin_1);
      delay_us(900);
    } else {
      GPIO_SetBits(GPIOA, GPIO_Pin_1);
      delay_us(900);
      GPIO_ResetBits(GPIOA, GPIO_Pin_1);
      delay_us(350);
    }
  }
  TIM_Cmd(TIM2, ENABLE);
}

void pwm_init() {
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_OCInitTypeDef TIM_OCInitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = 71;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  TIM_OCInitStructInit(&TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 35;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);

  TIM_Cmd(TIM2, ENABLE);
}

int main(void) {
  pwm_init();

  uint8_t buffer[LED_NUM * 24] = {0};

  while (1) {
    for (int i = 0; i <= 100; i++) {
      uint8_t r = i;
      uint8_t g = 100 - i;
      uint8_t b = 0;
      ws2812_set_color(buffer, r, g, b);
      ws2812_show(buffer);
      delay_ms(10);
    }
    for (int i = 100; i >= 0; i--) {
      uint8_t r = i;
      uint8_t g = 100 - i;
      uint8_t b = 0;
      ws2812_set_color(buffer, r, g, b);
      ws2812_show(buffer);
      delay_ms(10);
    }
  }
}

希望这个示例对你有所帮助！如果您有其他问题，请随时问我。