STM32F103RB, SPWM程序出问题请教

yviihpl · 发表于 2015-12-28 00:40:52

本帖最后由 yviihpl 于 2015-12-28 19:18 编辑

各位大虾，本人用的STM32F103RB产生一路SPWM，TIM1产生PWM，利用TIM3中断，更改PWM的占空比，程序仿真效果还可以。后来由于单片机引脚的要求，需要用到TIM4产生PWM，我把程序中TIM1改成TIM4，可为什么仿真没有了波形。百思不得其解，请高手指点。

部分程序如下：
//#include "timer.h"
#include "led.h"
#include "delay.h"
void TIM3_Int_Init(u16 arr,u16 psc);
void TIM1_PWM_Init(u16 arr,u16 psc);
void TIM3_IRQHandler(void);
            uint16_t Duty[]={ 0x7F,0x87,0x8F,0x97,0x9F,0xA6,0xAE,0xB5,0xBC,0xC3,0xCA,0xD0,0xD6,0xDC,0xE1,0xE6
,0xEB,0xEF,0xF2,0xF6,0xF8,0xFA,0xFC,0xFD,0xFE,0xFE,0xFE,0xFD,0xFC,0xFA,0xF8,0xF6
,0xF2,0xEF,0xEB,0xE6,0xE1,0xDC,0xD6,0xD0,0xCA,0xC3,0xBC,0xB5,0xAE,0xA6,0x9F,0x97
,0x8F,0x87,0x7F,0x77,0x6F,0x67,0x5F,0x58,0x50,0x49,0x42,0x3B,0x34,0x2E,0x28,0x22
,0x1D,0x18,0x13,0x0F,0x0C,0x08,0x06,0x04,0x02,0x01,0x00,0x00,0x00,0x01,0x02,0x04
,0x06,0x08,0x0C,0x0F,0x13,0x18,0x1D,0x22,0x28,0x2E,0x34,0x3B,0x42,0x49,0x50,0x58
,0x5F,0x67,0x6F,0x77};
            uint16_t count = 0;
            uint16_t num = sizeof(Duty)/(sizeof(Duty[0]));
int main(void)
{
            //delay_init();                   //延时函数初始化
            //NVIC_Configuration();//设置NVIC中断分组2:2位抢占优先级，2位响应优先级
            //LED_Init();                         //初始化与LED连接的硬件接口
            TIM3_Int_Init(299,47);//1Mhz的计数频率，
            TIM1_PWM_Init(499,47);//不分频。PWM频率=72000/(899+1)=80Khz
// TIM_SetCompare1(TIM1,20);

      while(1);
      }

//TIM1  pwm
void TIM1_PWM_Init(u16 arr,u16 psc)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIO外设时钟使能

//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH1
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值       80K
      TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
      TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
      TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //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_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
      TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

  TIM_CtrlPWMOutputs(TIM1,ENABLE);       //MOE 主输出使能
      TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能
      TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
      TIM_Cmd(TIM1, ENABLE);  //使能TIM1

}

//TIM3中断初始化
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能

      TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值       计数到5000为500ms
      TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率
      TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
      TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

      TIM_ITConfig( TIM3,       TIM_IT_Update ,       ENABLE  );
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);       //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
      NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
      NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

      TIM_Cmd(TIM3, ENABLE);  //使能TIMx外设

}

//定时器3中断服务程序
void TIM3_IRQHandler(void) //TIM3中断
{

                     if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
                              {
                                    TIM_ClearITPendingBit(TIM3, TIM_IT_Update);  //清除TIMx的中断待处理位:TIM 中断源
                                    TIM_SetCompare1(TIM1,Duty[count]);
                                             count++;
                                             if(count==num)
                                                      {
                                                            count=0;
                                                      }
                              }
}