STM32F1 PWM输出，捕获比较中断无法触发？有图

刘念夕 · 发表于 2020-3-7 16:04:51

我将Tim1配置为PWM输出模式，其中CH1通道输出占空比10%的pwm，其它位置使用TIM_SetCompare1已经成功实现，但是我配置的CH4通道的捕获/比较中断无法触发，我是参照中文手册资料配置的，想请教一下我配置的错误点在哪？谢谢各位大佬。
中文手册截图如下：依据图中的CMS=11对应的CCxIF应该是会触发的（tim1计数模式为中央计数模式3），所以我ch4通道的pluse配置为180，应该会在计数中间位置触发中断？不知道这样思考是否正确？

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

TIM_TimeBaseStructure.TIM_Period = 179;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 179;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

TIM_ClearFlag(TIM1, TIM_IT_CC4);
TIM_ITConfig(TIM1,TIM_IT_CC4,ENABLE );
TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;//捕获/比较中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);
            TIM_Cmd(TIM1, ENABLE);

void TIM1_CC_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_CC4) != RESET)
{
TIM_ClearITPendingBit(TIM1,TIM_IT_CC4);
               }
}