新人求助，请大神帮忙看看STM32F407的TIM1没有输出，在线等，急急急谢谢

18380190616 · 发表于 2018-1-26 17:39:41

这个是PWM的配置文件

#include "pwm.h"
#include "led.h"
#include "usart.h"

//TIM1 PWM部分初始化
//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM1_PWM_Init(u16 arr,u16 psc)
{
//此部分需手动修改IO口设置

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE); //TIM1时钟使能
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);  //使能PORTF时钟

GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_TIM1); //GPIOA8复用为定时器1

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;          //GPIOF9
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;       //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;    //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;       //上拉
GPIO_Init(GPIOA,&GPIO_InitStructure);             //初始化PF9

TIM_TimeBaseStructure.TIM_Prescaler=psc;  //定时器分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period=arr; //自动重装载值
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);//初始化定时器1

//初始化TIM1 Channel1 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低
TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1OC1
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR1上的预装载寄存器

  TIM_ARRPreloadConfig(TIM1,ENABLE);//ARPE使能

TIM_Cmd(TIM1, ENABLE);  //使能TIM1

}

这个是主函数

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

int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2
delay_init(168);  //初始化延时函数
uart_init(115200);//初始化串口波特率为115200
  TIM1_PWM_Init(500-1,840-1); //84M/84=1Mhz的计数频率,重装载值500，所以PWM频率为 1M/500=2Khz.
//while(1) //实现比较值从0-300递增，到300后从300-0递减，循环
//{
// led0pwmval=250;
//delay_ms(10);
// if(dir)led0pwmval++;//dir==1 led0pwmval递增
// else led0pwmval--; //dir==0 led0pwmval递减
  // if(led0pwmval>300)dir=0;//led0pwmval到达300后，方向为递减
//if(led0pwmval==0)dir=1; //led0pwmval递减到0后，方向改为递增

// TIM_SetCompare1(TIM14,led0pwmval); //修改比较值，修改占空比
//}
TIM_SetCompare1(TIM1,100);
}

18380190616 · 发表于 2018-1-26 17:39:42

共享下代码，这是PWM的代码

#include "pwm.h"
#include "led.h"
#include "usart.h"
//TIM1 PWM部分初始化
//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM1_PWM_Init(u32 arr,u32 psc)
{
   //此部分需手动修改IO口设置
GPIO_InitTypeDef  GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE); //TIM1时钟使能
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能PORTA时钟

   GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_TIM1);  //GPIOA8复用为定时器1

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;       //GPIOA8
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;    //复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;    //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //不上下拉
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_Init(GPIOA,&GPIO_InitStructure);             //初始化PA8

   TIM_TimeBaseStructure.TIM_Prescaler = psc;          //Timer clock = sysclock /(TIM_Prescaler+1) = 168M 定时器分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
   TIM_TimeBaseStructure.TIM_Period = arr;                      //自动重装载值
   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);       //初始化定时器1

   //初始化TIM1 Channel1 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;    //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  //比较输出使能
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //互补输出允许
TIM_OCInitStructure.TIM_Pulse = (arr+1)/2;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //High为占空比高极性，此时占空比为50%，Low则为反极性，占空比为50%
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;  //互补输出，与以上相反
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;

TIM_OC1Init(TIM1,&TIM_OCInitStructure); //根据T指定的参数初始化外设TIM1OC1
   TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR1上的预装载寄存器（CR自动装载默认是打开的）
TIM_ARRPreloadConfig(TIM1,ENABLE);//ARPE使能(ARR自动装载默认是打开的，可以不设置)
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE); //使能TIM1的PWM输出

}

主函数
#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "pwm.h"

//ALIENTEK 探索者STM32F407开发板实验9
//PWM输出实验-库函数版本
//技术支持：www.openedv.com
//淘宝店铺：http://eboard.taobao.com
//广州市星翼电子科技有限公司
//作者：正点原子 @ALIENTEK

int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2
delay_init(168);  //初始化延时函数
uart_init(115200);//初始化串口波特率为115200
TIM1_PWM_Init(500-1,168-1); //84M/84=1Mhz的计数频率,重装载值500，所以PWM频率为 1M/500=2Khz.
TIM_SetCompare1(TIM1,250);
}