PWM周期DEBUG停止正常运行就错误晕了望指教

只看该作者 · 2010-7-5 20:05

本帖最后由 57tm 于 2010-7-5 20:07 编辑

我把TIM3 OC3 配置成PWM输出 960US 周期分为十档运行起来周期就变成了1500us左右停下就是960us 如图: 郁闷了哪位指教下我再去看看

只看该作者 · 2010-7-5 20:06

/*******************************************************************************
* Function Name  :General_TIM_Config
* Description : TIM2~5
* Input          :
* Return       :
*******************************************************************************/
void TIM3_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_InitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; /*PB0 TIM3_CH3 PWM输出*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);


TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1; /*18mhz / 4/4*/
TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_InitStructure.TIM_Period = 480; /*960us 0x1e0*/
TIM_InitStructure.TIM_Prescaler = 35; /*960us 35+1 0x23*/
//TIM_InitStructure.TIM_RepetitionCounter
   TIM_TimeBaseInit(TIM3 , &TIM_InitStructure);

//TIM_OCInitStructure.TIM_OCIdleState =
//TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;
//TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_
//TIM_OCInitStructure.TIM_OutputNState =
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; /*CCER->CC1P*/
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse =  0x0014;/*0 level*/

TIM_OC3Init(TIM3 , &TIM_OCInitStructure);
//TIM_OC4Init(TIM8 , &TIM_OCInitStructure);
TIM3->CR1 |= bit_mask_7;/*APRE*/
TIM3->CCMR2 |= bit_mask_3;/*OCxPE 发生更新时间时写入CCxR的值生效在非OPM模式下必须置位*/

TIM_CCxCmd(TIM3 , TIM_Channel_3 , TIM_CCx_Enable); /*CCER->CCxE*/
//TIM_CCxCmd(TIM3 , TIM_Channel_4 , TIM_CCx_Enable); /*CCER->CCxE*/
TIM3->EGR |= bit_mask_0; /*updata UG*/
//TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM3, ENABLE);
}

只看该作者 · 2010-7-5 21:14

解决了 = =# 那个UG更新位不能用查询方式频繁的更新会使周期改变...

PWM周期DEBUG停止正常 运行就错误 晕了 望指教

PWM周期DEBUG停止正常运行就错误晕了望指教