stm32f103 TIM2定时器4路PWM输出实验

这里以TIM2为例

pwm.c

#include "pwm.h"

uint16_t TIM2_CCR1_Val;
uint16_t TIM2_CCR2_Val;
uint16_t TIM2_CCR3_Val;
uint16_t TIM2_CCR4_Val;

void pwm_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure; 
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    TIM_TimeBaseInitStructure.TIM_Period = 1999;//10KHz
    TIM_TimeBaseInitStructure.TIM_Prescaler = 359;
    TIM_TimeBaseInitStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, & TIM_TimeBaseInitStructure);
    
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;    
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
        
    TIM_OCInitStructure.TIM_Pulse = TIM2_CCR1_Val;  
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
    
    TIM_OCInitStructure.TIM_Pulse = TIM2_CCR2_Val;		
    TIM_OC2Init(TIM2, &TIM_OCInitStructure);
    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_OCInitStructure.TIM_Pulse = TIM2_CCR3_Val;	
    TIM_OC3Init(TIM2, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
    
    TIM_OCInitStructure.TIM_Pulse = TIM2_CCR4_Val;	
    TIM_OC4Init(TIM2, &TIM_OCInitStructure);
    TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);
            
    TIM_ARRPreloadConfig(TIM2, ENABLE);
    TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);
    TIM_CtrlPWMOutputs(TIM2, ENABLE);
    TIM_Cmd(TIM2, ENABLE);
}

pwm.h

#ifndef _pwm_H
#define _pwm_H
#include "stm32f10x.h"

void pwm_init(void);

#endif