STM32主从模式实现两路同步PWM脉冲输出，频率、占空比可调-Toy模板网

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原理：定时器1为主模式，定时器8为从模式，TIM1的定时器使能操作作为触发输出[TRGO]触发TIM8并使能TIM8的计数器，同时输出两路频率、占空比以及脉冲数量(小于256个，高级定时器重复计数功能为8位)可调PWM波形。

stm32f103主从模式,stm32,单片机,arm

关键代码：

定时器1（TIM1）设为主模式：

    TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
    TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Enable);

定时器2（TIM8）设为从模式

    TIM_SelectSlaveMode(TIM8, TIM_SlaveMode_Trigger);
    TIM_SelectInputTrigger(TIM8, TIM_TS_ITR0);

STM32F103系列主从定时器Trigger设置详见STM32F103系列定时器通道对应IO汇总

定时器1开启计数功能、定时器2计数功能无需设定，即既不使能也不禁用

    TIM_Cmd(TIM1, ENABLE);  //启动定时器TIM1的计数功能  
	//TIM_Cmd(TIM8, ENABLE);  // 无需启动定时器TIM8的计数功能，该功能由trgo信号使能

测试结果：

① 橘色：定时器TIM1：频率8MHz；脉冲个数8个；占空比0.5；

② 蓝色：定时器TIM8：频率2MHz；脉冲个数2个；占空比0.5；

橘色和蓝色同步输出，误差仅4~5ns可忽略

stm32f103主从模式,stm32,单片机,arm

主函数：

#include "sys.h"
#include "delay.h"
#include "pwm.h"

int main(void)
{
    delay_init();
    GPIO_Configuration();
    while(1)
    {
        PWM_TIM1_TIM8(8000E3,50,8, 2000E3,50,2); // Freq1, duty_cycle1,PulseNum1,Freq2, duty_cycle2,PulseNum2
        
        delay_ms(20);
        
    }
    
}

定时器配置 pwm.c：文章来源地址https://www.toymoban.com/news/detail-535456.html

#include "pwm.h"
void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8 | RCC_APB2Periph_TIM1, ENABLE);     //使能TIM1 TIM8
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);    //使能GPIOC,使能复用
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
    GPIO_PinRemapConfig(GPIO_FullRemap_TIM1,ENABLE);                               //串口重映射 PA11-->PE14
   /*-------- 主定时器 TIM1-CH4 -> PA11 (PE14)  --------*/    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  //  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOE, &GPIO_InitStructure);
    /*--------从定时器 TIM8-CH2 -> PC7 --------*/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    GPIO_SetBits(GPIOC,GPIO_Pin_7);

  //  GPIO_SetBits(GPIOE,GPIO_Pin_14);
}

// Freq ： 脉冲频率
// PulseNum ： 脉冲数量
// duty_cycle ： 占空比
void PWM_TIM1_TIM8(u32 Freq0, u8 duty_cycle0, u8 PulseNum0, u32 Freq1, u8 duty_cycle1, u8 PulseNum)
{
    u16 ARR0;
    u16 CCR0;
    u16 PSC0 = 1;
	
    u16 ARR1;
    u16 CCR1;
    u16 PSC1 = 1;
	
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;
    while(SystemCoreClock/PSC0/Freq0>65535)
    {
        PSC0++;
    }
    ARR0 = SystemCoreClock/PSC0/Freq0;
    TIM_TimeBaseStructure.TIM_Period = (ARR0-1);		                               //  设置重装载数据										
    TIM_TimeBaseStructure.TIM_Prescaler = (PSC0-1);                                    //  定时器时钟分频											    
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;                                       //  计数器时钟分频
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;                        //  向上计数模式		
    TIM_TimeBaseStructure.TIM_RepetitionCounter = (PulseNum0 -1);                      //  脉冲数量    
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
    TIM_SelectOnePulseMode(TIM1, TIM_OPMode_Single);
    TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
    TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Enable);
    
    CCR0 = ARR0*(100-duty_cycle0) /100;
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;;
    TIM_OCInitStructure.TIM_Pulse = CCR0;					                           //  比较值，当为PWM2模式且输出极性为High，表示低电平持续时间
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    TIM_OC4Init(TIM1, &TIM_OCInitStructure);	
    TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
    TIM_ARRPreloadConfig(TIM1, ENABLE);	
    TIM_CtrlPWMOutputs(TIM1, ENABLE);

    while(SystemCoreClock/PSC1/Freq1>65535)
    {
        PSC1++;
    }
    ARR1 = SystemCoreClock/PSC1/Freq1;
    TIM_TimeBaseStructure.TIM_Period = (ARR1-1);		                               //  设置重装载数据										
    TIM_TimeBaseStructure.TIM_Prescaler = (PSC1-1);                                    //  定时器时钟分频											    
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;                                       //  计数器时钟分频
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;                        //  向上计数模式		
    TIM_TimeBaseStructure.TIM_RepetitionCounter = (PulseNum -1);                       //  脉冲数量    
    TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);
    TIM_SelectOnePulseMode(TIM8, TIM_OPMode_Single);
    TIM_SelectSlaveMode(TIM8, TIM_SlaveMode_Trigger);
    TIM_SelectInputTrigger(TIM8, TIM_TS_ITR0);
    
    CCR1 = ARR1*(100-duty_cycle1) /100;
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;;
    TIM_OCInitStructure.TIM_Pulse = CCR1;					                           //  比较值，当为PWM2模式且输出极性为High，表示低电平持续时间
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    TIM_OC2Init(TIM8, &TIM_OCInitStructure);	
    TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable);
    TIM_ARRPreloadConfig(TIM8, ENABLE);	
    TIM_CtrlPWMOutputs(TIM8, ENABLE);

    TIM_Cmd(TIM1, ENABLE);  //启动定时器TIM1的计数功能  
	//TIM_Cmd(TIM8, ENABLE);  // 无需启动定时器TIM8的计数功能，该功能由trgo信号使能
}

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