跪求大神，想要输出两路PWM波。现在就只有PB5有输出，，，，

糖糖人 · 发表于 2016-5-12 15:10:34

#include "pbdata.h"

void RCC_Configuration(void);
void GPIO_Configuration(void);
void TIM3_Configuration(void);

int main(void)
{
u8 led_fx=1;
u16 led_dt=180;

RCC_Configuration(); //Ïμí3ê±Öó3õê¼»ˉ
GPIO_Configuration();//¶Ë¿ú3õê¼»ˉ
TIM3_Configuration();//¶¨ê±Æ÷oípwmÅäÖÃ
while(1)
{
      delay_ms(10);
   if(led_fx==1)
   {
led_dt++;
   }
   else
   {
   led_dt--;
   }

   if(led_dt>190)  led_fx=0;
   if(led_dt==0)    led_fx=1;
   //led_dt=180;

   TIM_SetCompare1(TIM3,led_dt);
   TIM_SetCompare2(TIM3,led_dt);
   TIM_SetCompare3(TIM3,led_dt);
   TIM_SetCompare4(TIM3,led_dt);
   }
}

void RCC_Configuration(void)
{
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//LED
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_Init(GPIOB,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4|GPIO_Pin_1|GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_Init(GPIOB,&GPIO_InitStructure);
}

void TIM3_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct;
TIM_OCInitTypeDef TIM_OCInitStructure;

GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3,ENABLE);

//¶¨ê±Æ÷3õê¼»ˉ
TIM_TimeBaseStruct.TIM_Period=199;//3õÖμ199
TIM_TimeBaseStruct.TIM_Prescaler=7199;//Ô¤·ÖÆμ
TIM_TimeBaseStruct.TIM_ClockDivision=0;
TIM_TimeBaseStruct.TIM_CounterMode=TIM_CounterMode_Up;//ÏòéÏ

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStruct);

//pwm 3õê¼»ˉ
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Disable;

TIM_OC2Init(TIM3,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;       //???,????????
  TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OC1Init(TIM3,&TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_Cmd(TIM3,ENABLE);
}

Electronic · 发表于 2016-5-12 15:10:35

PB4需要关闭JTAG映射

糖糖人 · 发表于 2016-5-12 15:11:32

大神帮忙看看哪里有问题，，，刚开始学没多久

无休 · 发表于 2016-5-12 21:59:34

占空比没有设置怎么会有输出

糖糖人 · 发表于 2016-5-12 22:22:57

无休发表于 2016-5-12 21:59
占空比没有设置怎么会有输出

我设置了啊

这段
TIM_SetCompare1(TIM3,led_dt);
               TIM_SetCompare2(TIM3,led_dt);
               TIM_SetCompare3(TIM3,led_dt);
               TIM_SetCompare4(TIM3,led_dt);