stm32输出pwm问题

奔跑吧少年 · 发表于 2017-8-29 17:53:25

采用定时器TIM1输出两路通道1 4PWM 但通道1检测不到脉冲下面是源程序
#include "motor.h"

void motor_init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void pwm_init(u16 arr,u16 psc)
{
   GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
      motor_init();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC4Init(TIM1, &TIM_OCInitStructure);

   TIM_CtrlPWMOutputs(TIM1,ENABLE);

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM1, ENABLE);

TIM_Cmd(TIM1, ENABLE);

}

主函数：
int main(void)
  {
delay_init();
uart_init(9600);
pwm_init(7199,0);
AIN1=0;
AIN2=1;
BIN1=0;
BIN2=1;
PWMA=3600;/ PWMB=1800;
while(1)
   {
   LED0=!LED0;
   delay_ms(5);
   }
}

本人刚接触32，绝对不是伸手党，还望有大佬帮忙看下，这个程序调了两天了，硬是没调出来，臣本愚拙，望有明君指教。

Sun_Fly · 发表于 2017-8-29 17:53:26

每一个通道都要单独配置，多看例程有好处

奔跑吧少年 · 发表于 2017-8-29 18:08:28

Sun_Fly 发表于 2017-8-29 18:04
每一个通道都要单独配置，多看例程有好处

TIM_OC1Init(TIM1, &TIM_OCInitStructure);
      TIM_OC4Init(TIM1, &TIM_OCInitStructure);

   TIM_CtrlPWMOutputs(TIM1,ENABLE);

      TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
      TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
这个是配置了吗？我移植平衡小车之家的程序，您看有什么问题吗