PWM 脉冲宽度调制

PWM.h

#ifndef __PWM_H
#define __PWM_H

void PWM_Init(void);
void PWM_SetCompare1(uint16_t Compare1);
void PWM_SetCompare2(uint16_t Compare2);
void PWM_SetCompare(uint16_t Compare);

#endif

PWM.C

#include "stm32f10x.h" // Device header

/**
 * 初始化两路 PWM
 */
void PWM_Init(void)
{
	// 开启时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	// 初始化 GPIO
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 复用推挽输出
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; // PA0 | PA1
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	// 配置时钟源
	TIM_InternalClockConfig(TIM2);
	
	// 初始化时基单元
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 100 - 1; // ARR
	TIM_TimeBaseInitStructure.TIM_Prescaler = 720 - 1; // PSC
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
	
	// 初始化输出比较
	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit(&TIM_OCInitStructure);
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 0;// CCR
	TIM_OC1Init(TIM2, &TIM_OCInitStructure); // 配置TIM2的输出比较通道1
	TIM_OC2Init(TIM2, &TIM_OCInitStructure); // 配置TIM2的输出比较通道2
	
	// 使能 TIM2
	TIM_Cmd(TIM2, ENABLE);
}

/**
 * 设置CCR(0~100)，占空比 Duty = CCR / (ARR + 1)
 */
void PWM_SetCompare1(uint16_t Compare1)
{
	TIM_SetCompare1(TIM2, Compare1);
}

void PWM_SetCompare2(uint16_t Compare2)
{
	TIM_SetCompare2(TIM2, Compare2);
}

void PWM_SetCompare(uint16_t Compare)
{
	TIM_SetCompare1(TIM2, Compare);
	TIM_SetCompare2(TIM2, Compare);
}