stm32f103c8t6输出spwm代码

以下是一个基于STM32F103C8T6芯片的SPWM输出的代码示例，代码中使用了定时器3和定时器4来生成SPWM波形：

#include "stm32f10x.h"

#define PI 3.1415926
#define PWM_FREQ 1000
#define PWM_PERIOD (72000000 / PWM_FREQ)

void TIM3_PWM_Init(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC3Init(TIM3, &TIM_OCInitStructure);
    TIM_Cmd(TIM3, ENABLE);
}

void TIM4_PWM_Init(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC3Init(TIM4, &TIM_OCInitStructure);
    TIM_Cmd(TIM4, ENABLE);
}

int main(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    TIM3_PWM_Init();
    TIM4_PWM_Init();

    uint16_t sin_table[PWM_PERIOD];
    for (int i = 0; i < PWM_PERIOD; i++) {
        sin_table[i] = (sin(2 * PI * i / PWM_PERIOD) + 1) * (PWM_PERIOD / 2);
    }

    int phase_shift = PWM_PERIOD / 3;
    int offset = 0;

    while (1) {
        for (int i = 0; i < PWM_PERIOD; i++) {
            TIM_SetCompare3(TIM3, sin_table[(i + offset) % PWM_PERIOD]);
            TIM_SetCompare3(TIM4, sin_table[(i + phase_shift + offset) % PWM_PERIOD]);
            for (int j = 0; j < 100; j++);
        }
        offset++;
        if (offset >= PWM_PERIOD) {
            offset = 0;
        }
    }
}

代码中使用定时器3和定时器4输出两路SPWM波形，其中`sin_table`数组存储了一个完整的正弦波周期的PWM值，通过改变`offset`变量的值来实现相位移动。需要注意的是，在实际应用中需要根据具体的电机或电器特性调整PWM频率、周期和幅值等参数。