基于stm32的ws2812b的驱动代码

以下是基于STM32的WS2812B驱动代码示例：

首先需要定义一些常量和变量，包括WS2812B的灯珠数量、颜色值数组、TIM的配置等等：

#define LED_NUM 8
uint8_t led_color[LED_NUM][3];
TIM_HandleTypeDef htim2;

然后需要初始化TIM，设置PWM模式和周期：

void MX_TIM2_Init(void)
{
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 89;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  HAL_TIM_MspPostInit(&htim2);
}

接下来是发送数据的函数，这里使用了DMA进行数据发送：

void WS2812B_SendData(uint8_t *led_color, uint16_t led_num)
{
  uint8_t data[24 * LED_NUM] = {0}; //每个灯珠有24bit数据
  uint16_t i, j, k;
  for (i = 0, j = 0; i < led_num; i++)
  {
    for (k = 0; k < 8; k++) //bit7-bit0
    {
      if (led_color[i][7 - k / 3] & (1 << (k % 3))) //bit1
      {
        data[j++] = 58; //占空比38%
      }
      else //bit0
      {
        data[j++] = 29; //占空比13%
      }
    }
    for (k = 0; k < 8; k++) //bit15-bit8
    {
      if (led_color[i][7 - k / 3] & (1 << (k % 3))) //bit1
      {
        data[j++] = 58; //占空比38%
      }
      else //bit0
      {
        data[j++] = 29; //占空比13%
      }
    }
    for (k = 0; k < 8; k++) //bit23-bit16
    {
      if (led_color[i][7 - k / 3] & (1 << (k % 3))) //bit1
      {
        data[j++] = 58; //占空比38%
      }
      else //bit0
      {
        data[j++] = 29; //占空比13%
      }
    }
  }
  HAL_TIM_PWM_Stop_DMA(&htim2, TIM_CHANNEL_1);
  HAL_DMA_Start(&hdma_tim2_ch1, (uint32_t)data, (uint32_t)&TIM2->CCR1, j);
  HAL_TIM_PWM_Start_DMA(&htim2, TIM_CHANNEL_1, (uint32_t *)data, j);
}

最后是主函数中的代码，这里只是对led_color数组进行了简单赋值，然后调用了发送数据的函数：

int main(void)
{
  HAL_Init();
  MX_TIM2_Init();
  MX_DMA_Init();

  for (int i = 0; i < LED_NUM; i++)
  {
    led_color[i][0] = 255; //红色
    led_color[i][1] = 0;   //绿色
    led_color[i][2] = 0;   //蓝色
  }
  WS2812B_SendData((uint8_t *)led_color, LED_NUM);

  while (1)
  {
  }
}

以上代码仅供参考，具体实现需要根据自己的硬件平台和需求进行调整。