先看看结果：

这个是根据上午发的文章的基础上更改的，很简单，只是用了一个定时器，初始化了4个比较器而已，就可以单独的控制每一路PWM的占空比了，好了，把源文件展示一下，完事去接孩子放学。

PWM.c文件：

#include "stm32f10x.h"                  // Device header



void PWM_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	TIM_InternalClockConfig(TIM2);
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
	TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStruct.TIM_Period = 100-1;
	TIM_TimeBaseInitStruct.TIM_Prescaler = 720-1;
	TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
	
	TIM_OCInitTypeDef TIM_OCInitStruct;
	TIM_OCStructInit(&TIM_OCInitStruct);
	TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStruct.TIM_Pulse = 0;
	
	TIM_OC1Init(TIM2, &TIM_OCInitStruct);
	TIM_OC2Init(TIM2, &TIM_OCInitStruct);
	TIM_OC3Init(TIM2, &TIM_OCInitStruct);
	TIM_OC4Init(TIM2, &TIM_OCInitStruct);
	
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 |GPIO_Pin_3;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStruct);
	
	TIM_Cmd(TIM2, ENABLE);
	
}


//  设置PWM的函数，第一个参数是第几个比较器的意思，   第二个参数是这个比较器的值是多少？
void SET_PWM(uint16_t num, uint16_t key)
{
	if(num == 1)
	{
		TIM_SetCompare1(TIM2, key);
	}
	if(num == 2)
	{
		TIM_SetCompare2(TIM2, key);
	}
	if(num == 3)
	{
		TIM_SetCompare3(TIM2, key);
	}
	if(num == 4)
	{
		TIM_SetCompare4(TIM2, key);
	}
}

PWM.h文件：

#ifndef __PWM_H
#define __PWM_H


void PWM_Init(void);

void SET_PWM(uint16_t num, uint16_t key);

#endif

main.c主函数文件：

#include "stm32f10x.h"                  // Device header
#include "OLED.h"
#include "PWM.h"

int main(void)
{
	
	OLED_Init();       //oled  屏幕初始化
	PWM_Init();
	
	
	SET_PWM(1, 10);   //设置通道1的占空比为10%
	SET_PWM(2, 20);   //设置通道2的占空比为20%
	SET_PWM(3, 30);   //设置通道3的占空比为30%
	SET_PWM(4, 40);   //设置通道4的占空比为40%
	while(1)
	{

	}
}

其实整个过程只是增加了一个函数而已：这个函数就是：

好了，自己理解吧。