stm32定時(shí)器1PWM控制PA8，定時(shí)器3控制PD2

ID:267583 · 發(fā)表于 2018-8-27 22:14

兩個(gè)定時(shí)器同時(shí)打開，pwm不工作，單獨(dú)都可以工作，單步運(yùn)行到紅色字體處出現(xiàn)問題，沒有弄明白請大神幫忙看一下，

定時(shí)器3初始化u16 time_ms=0;

u16 USART1_Heartbeat_time=0;
/*
*********************************************************************************************
*          函數(shù)
*********************************************************************************************
*/
void time3_init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //時(shí)鐘使能

TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個(gè)更新事件裝入活動(dòng)的自動(dòng)重裝載寄存器周期的值    計(jì)數(shù)到5000為500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時(shí)鐘頻率除數(shù)的預(yù)分頻值  10Khz的計(jì)數(shù)頻率
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時(shí)鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上計(jì)數(shù)模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);       //使能指定的TIM2中斷,允許更新中斷
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;  //先占優(yōu)先級(jí)0級(jí)
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //從優(yōu)先級(jí)3級(jí)
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根據(jù)NVIC_InitStruct中指定的參數(shù)初始化外設(shè)NVIC寄存器

TIM_Cmd(TIM3,ENABLE);                      //使能TIM3定時(shí)器
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);  //清除TIMx更新中斷標(biāo)志

}

//時(shí)間10ms
void TIM3_IRQHandler(void) //TIM3中斷
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //檢查指定的TIM中斷發(fā)生與否:TIM 中斷源
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx的中斷待處理位:TIM 中斷源
time_ms++;
USART1_Heartbeat_time++;             //心跳定時(shí)器
if(LED_Red.LED_Start_Flash_Flag==1) //指示燈定時(shí)器
{
LED_Red.LED_Start_Flash_time++;
}
else
   {
   LED_Red.LED_Start_Flash_Flag=0;
   LED_Red.LED_Start_Flash_time=0;
}

if(LED_Green.LED_Start_Flash_Flag==1) //指示燈定時(shí)器
{
   LED_Green.LED_Start_Flash_time++;
}
   else
{
LED_Green.LED_Start_Flash_Flag=0;
LED_Green.LED_Start_Flash_time=0;
}

if(((USART1_Heartbeat_time>=500)&&(USART1_Heartbeat_flag==0)))//串口1心跳
{
   printf("\r\n @@@Heartbeat@@@ \n");;
      USART1_Heartbeat_time=0;
}

}
}

定時(shí)器1pwm初始化

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|RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外設(shè)和AFIO復(fù)用功能模塊時(shí)鐘


//設(shè)置該引腳為復(fù)用輸出功能,輸出TIM1 CH1的PWM脈沖波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個(gè)更新事件裝入活動(dòng)的自動(dòng)重裝載寄存器周期的值    80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時(shí)鐘頻率除數(shù)的預(yù)分頻值  不分頻
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時(shí)鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上計(jì)數(shù)模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_Pulse = 0; //設(shè)置待裝入捕獲比較寄存器的脈沖值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根據(jù)TIM_OCInitStruct中指定的參數(shù)初始化外設(shè)TIMx

  TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主輸出使能

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1預(yù)裝載使能

TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的預(yù)裝載寄存器

TIM_Cmd(TIM1, ENABLE);  //使能TIM1

}