stm32 tim1 4 PWM 关闭问题

只看该作者 · 2011-10-13 03:32

本帖最后由 dcp 于 2011-10-13 03:38 编辑

芯片是STM32F103RCT6
IAR6.21
2.01库

tim1 tim4 开PWM和溢出中断，tim1 tim4溢出中断正常工作，PWM波正常，但tim4对应的PWM波不能关闭

TIM_CtrlPWMOutputs(TIM1, ENABLE); 打开PWM
TIM_CtrlPWMOutputs(TIM1, DISABLE);  可正常关闭PWM

TIM_CtrlPWMOutputs(TIM4, ENABLE); 打开PWM
TIM_CtrlPWMOutputs(TIM4, DISABLE);  不能正常关闭PWM，这句有没有都有一样有PWM波形

请教是哪里设置出错？

void tim1_PWM_init(u16 PWM_frequency)//  PWM+定时中断
{

   GPIO_InitTypeDef GPIO_InitStructure;
   /* Timer1 Channel 2, PA8 */
   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

TIM_DeInit(TIM1);

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
//TIM_TimeBaseStructure.TIM_Period = 7; ////1us*(499+1)=500us
//TIM_TimeBaseStructure.TIM_Prescaler = 71; //(71+1)/72000000=1us

TIM_TimeBaseStructure.TIM_Period = (72000 / PWM_frequency - 1); //
TIM_TimeBaseStructure.TIM_Prescaler = 0;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
//-------
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;

//TIM_OCInitStructure.TIM_Pulse = CCR1_Val;//占空比

TIM_OCInitStructure.TIM_Pulse = (72000 / PWM_frequency - 1) / 2; //

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);


// TIM_OC1Init(TIM1,&TIM_OCInitStructure);
TIM_CtrlPWMOutputs(TIM1, ENABLE);

//========

NVIC_InitTypeDef NVIC_InitStructure;
//Enable the TIM1 gloabal Interrupt TIM1_UP_IRQChannel
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQChannel;//TIM1_UP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ARRPreloadConfig(TIM1, DISABLE);
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM1, ENABLE);

}

void tim4_PWM_init(u16 PWM_frequency)//  PWM+定时中断
{

   GPIO_InitTypeDef GPIO_InitStructure;

   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8; //M2CY
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOB, &GPIO_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);

TIM_DeInit(TIM4);
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
//TIM_TimeBaseStructure.TIM_Period = 7; ////1us*(499+1)=500us
//TIM_TimeBaseStructure.TIM_Prescaler = 71; //(71+1)/72000000=1us

TIM_TimeBaseStructure.TIM_Period = (72000 / PWM_frequency - 1); //
TIM_TimeBaseStructure.TIM_Prescaler = 0;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
//-------
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;

//TIM_OCInitStructure.TIM_Pulse = CCR1_Val;//占空比

TIM_OCInitStructure.TIM_Pulse = (72000 / PWM_frequency - 1) / 2; //

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC3Init(TIM4, &TIM_OCInitStructure);


//TIM_OC3Init(TIM4,&TIM_OCInitStructure);
TIM_CtrlPWMOutputs(TIM4, ENABLE);

//========

NVIC_InitTypeDef NVIC_InitStructure;
//Enable the TIM1 gloabal Interrupt TIM1_UP_IRQChannel
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 5;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM_ClearFlag(TIM4, TIM_FLAG_Update);
TIM_ARRPreloadConfig(TIM4, DISABLE);
TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);



TIM_Cmd(TIM4, ENABLE);

}

void TIM1_UP_IRQHandler(void)
{

if(TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)
{
      TIM_ClearITPendingBit(TIM1, TIM_IT_Update);
      LED9B();

}

}

void TIM4_IRQHandler(void)
{
if(TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
      TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
      LED8B();

   }
}

1万 · 2011-10-13 09:02

本帖最后由 airwill 于 2011-10-13 09:06 编辑

看样子, 楼主是没有仔细看手册咯.
固件手册这么写的:

void TIM_CtrlPWMOutputs  ( TIM_TypeDef *  TIMx,
  FunctionalState  NewState
)

Enables or disables the TIM peripheral Main Outputs.

参数:
TIMx,: where x can be 1, 8, 15, 16 or 17 to select the TIMx peripheral.
NewState,: new state of the TIM peripheral Main Outputs. This parameter can be: ENABLE or DISABLE.

返回值:
None

也就是说, TIM_CtrlPWMOutputs() 的  TIMx: where x can be 1, 8, 15, 16 or 17
Tim4 是没有作用的.

仔细再看函数的实现:

TIMx->BDTR |= BDTR_MOE_Set;
(TIMx->BDTR &= BDTR_MOE_Reset;)

Tim4 没有 BDTR, 就没有 MOE 位, 所以这个函数无效