定时器输入捕获求助
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#include"CAM.h" #define TIMER TIM2 void init_tim2_cam(u16 psc, u16 arr, u8 way, u8 dir) { RCC->APB1ENR |= 1 << 0; //使能定时器2时钟 RCC->APB2ENR |= 1 << 2; //使能PortA switch (way) { case 1: GPIOA->CRL &= 0xfffffff0; GPIOA->CRL |= 0x00000008; break; case 2: GPIOA->CRL &= 0xffffff00; GPIOA->CRL |= 0x00000088; break; case 3: GPIOA->CRL &= 0xfffff000; GPIOA->CRL |= 0x00000888; break; case 4: GPIOA->CRL &= 0xffff0000; GPIOA->CRL |= 0x00008888; break; } TIMER->PSC = psc; TIMER->ARR = arr; switch (way) { case 4: TIMER->CCMR2 |= 1 << 8; if (dir == 0) TIMER->CCER |= 1 << 13; //下降沿捕获 else TIMER->CCER &= ~(1 << 13); //上升沿捕获 TIMER->CCER |= 1 << 12; TIMER->DIER |= 1 << 4; case 3: //CCR3 PA2 TIMER->CCMR2 |= 1 << 0; if (dir == 0) TIMER->CCER |= 1 << 9; //下降沿捕获 else TIMER->CCER &= ~(1 << 9); //上升沿捕获 TIMER->CCER |= 1 << 8; TIMER->DIER |= 1 << 3; case 2: //CCR2 PA1 TIMER->CCMR1 |= 1 << 8; //CCR2配置通道方向:输入 if (dir == 0) TIMER->CCER |= 1 << 5; //下降沿捕获 else TIMER->CCER &= ~(1 << 5); //上升沿捕获 TIMER->CCER |= 1 << 4; //CCR2通道捕获使能 TIMER->DIER |= 1 << 2; //CCR2通道允许捕获中断 case 1: //>CCR1 PA0 TIMER->CCMR1 |= 1 << 0; //CCR1配置通道方向：输入 if (dir == 0) TIMER->CCER |= 1 << 1; //下降沿捕获 else TIMER->CCER &= ~(1 << 1); //上升沿捕获 TIMER->CCER |= 1 << 0; //CCR1捕获使能 TIMER->DIER |= 1 << 1; //CCR1通道允许捕获中断 break; } TIMER->DIER |= 1 << 0; //允许更新中断 MY_NVIC_Init(1, 2, TIM2_IRQChannel, 2); //中断 TIMER->CR1 = 0x01; //使能定时器 TIMER->SR &= ~(1 << 0); } 以前写的头文件 可以配置定时器2的四路捕获，你参考下嘛，可以正常工作的转载，仅供参考。
