使用STM32F103C8T6 产生一堆SPWM

好的，您可以使用STM32F103C8T6的定时器和DAC来产生SPWM。首先，您需要配置定时器为PWM模式，并设置周期和占空比。然后，将DAC的输出连接到您的SPWM电路中。在定时器中断中，您可以更新DAC的输出值以生成SPWM波形。下面是一个简单的代码示例：

#include "stm32f10x.h"

#define PWM_FREQ 20000 // PWM频率
#define PWM_PERIOD ((SystemCoreClock / PWM_FREQ) - 1) // PWM周期

uint16_t spwm_lut[256] = { /* SPWM查表表格 */ };

void TIM2_IRQHandler(void)
{
    static uint8_t index = 0;
    DAC_SetChannel1Data(DAC_Align_12b_R, spwm_lut[index]);
    index++;
    if (index == 256) {
        index = 0;
    }
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}

int main(void)
{
    // 初始化定时器
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    TIM_TimeBaseInitStruct.TIM_Prescaler = 0;
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInitStruct.TIM_Period = PWM_PERIOD;
    TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);

    // 配置定时器为PWM模式
    TIM_OCInitTypeDef TIM_OCInitStruct;
    TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStruct.TIM_Pulse = PWM_PERIOD / 2; // 50%占空比
    TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM2, &TIM_OCInitStruct);

    // 初始化DAC
    DAC_InitTypeDef DAC_InitStruct;
    DAC_InitStruct.DAC_Trigger = DAC_Trigger_None;
    DAC_InitStruct.DAC_WaveGeneration = DAC_WaveGeneration_None;
    DAC_InitStruct.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
    DAC_Init(DAC_Channel_1, &DAC_InitStruct);
    DAC_Cmd(DAC_Channel_1, ENABLE);

    // 启用定时器中断
    NVIC_InitTypeDef NVIC_InitStruct;
    NVIC_InitStruct.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    // 启动定时器
    TIM_Cmd(TIM2, ENABLE);

    while (1) {
        // 主循环
    }
}

在上面的代码中，我们使用了一个256个元素的SPWM查表表格，并在定时器中断中更新DAC的输出值以生成SPWM波形。您需要根据您的具体电路和要求调整SPWM查表表格和PWM周期。同时，您还需要根据您的具体需求调整占空比和PWM频率。