STM32是利用定时器产生PWM的，STM32 定时器非常强大，其中上篇文章提到的SYSTICK也是定时器的一种，先上一段我编写的程序与大家分享，有什么不对的欢迎大家指点迷津。（现在开始慢慢都用函数写程序了，显得有层次。）

题目：用STM32的 TIM3产生四路PWM输出，占空比任意即可。

#include "stm32f10x_conf.h"

void GPIO_CFG(void);

void RCC_CFG(void);

void TIM_CFG(void);

int main (void)

{

RCC_CFG();

GPIO_CFG();

TIM_CFG();

TIM_Cmd(TIM3,ENABLE);

TIM_CtrlPWMOutputs(TIM3,ENABLE);

while(1);

}

void RCC_CFG(void)

{

SystemInit();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

}

void GPIO_CFG(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6|GPIO_Pin_7;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;

GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;

GPIO_Init(GPIOB,&GPIO_InitStructure);

}

void TIM_CFG(void)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_TimeBaseStructure.TIM_Period=2000;

TIM_TimeBaseStructure.TIM_Prescaler=35999;

TIM_TimeBaseStructure.TIM_ClockDivision=0x00;

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;

TIM_TimeBaseStructure.TIM_RepetitionCounter=0x00;

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;

TIM_OCInitStructure.TIM_Pulse=1000;

TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OC1Init(TIM3,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse=400;

TIM_OC2Init(TIM3,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse=1000;

TIM_OC3Init(TIM3,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse=550;

TIM_OC4Init(TIM3,&TIM_OCInitStructure);

}