STM32F103RCT6使用内部晶振pwm驱动ws2812b

要使用STM32F103RCT6内部晶振驱动WS2812B，您可以使用定时器模块和DMA控制器来生成PWM信号。以下是一个基本的代码框架：

首先，您需要初始化定时器和DMA控制器：

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
DMA_InitTypeDef DMA_InitStruct;

// Enable clock for TIM3 and DMA1
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

// Initialize TIM3
TIM_TimeBaseInitStruct.TIM_Prescaler = 0;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = 29;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);

// Initialize DMA1 channel 2
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&TIM3->CCR1;
DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)LED_Buffer;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStruct.DMA_BufferSize = LED_COUNT * 24;
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
DMA_InitStruct.DMA_Priority = DMA_Priority_High;
DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStruct);

// Enable DMA1 channel 2 transfer complete interrupt
DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE);

然后，您需要编写一个函数来设置WS2812B LED的颜色：

void setLED(uint8_t index, uint8_t red, uint8_t green, uint8_t blue) {
    uint32_t bits = (green << 16) | (red << 8) | blue;
    uint32_t mask = 0x800000;
    uint32_t *buffer = (uint32_t*)LED_Buffer;

    for (int i = 0; i < 24; i++) {
        if (bits & mask) {
            buffer[index * 24 + i] = 28;
        } else {
            buffer[index * 24 + i] = 13;
        }
        mask >>= 1;
    }
}

最后，您需要在主函数中初始化LED缓冲区并启动定时器和DMA控制器：

#define LED_COUNT 16
uint8_t LED_Buffer[LED_COUNT * 24];

int main(void) {
    // Initialize LED buffer
    for (int i = 0; i < LED_COUNT; i++) {
        setLED(i, 255, 0, 0);
    }

    // Start TIM3 and DMA1 channel 2
    TIM_Cmd(TIM3, ENABLE);
    DMA_Cmd(DMA1_Channel2, ENABLE);

    while (1);
}

这个例子中使用的是定时器3，通过生成PWM信号来驱动WS2812B LED。每个LED需要发送24位数据，其中每个位都是通过PWM信号来控制的。为了确保PWM信号的准确性，我们使用DMA控制器来发送数据。在上面的代码中，LED_Buffer数组包含LED颜色数据，每个LED使用24个字节。DMA控制器将数据从LED_Buffer数组传输到TIM3的CCR1寄存器，从而生成PWM信号。请注意，需要根据自己的实际情况调整定时器和DMA控制器的设置。