[置顶] TIM_GetCounter与TIM_GetCapture1的区别
/** * @brief Gets the TIMx Input Capture 1 value. * @param TIMx: where x can be 1 to 17 except 6 and 7 to select the TIM peripheral. * @retval Capture Compare 1 Register value. */ uint16_t TIM_GetCapture1(TIM_TypeDef* TIMx) { /* Check the parameters */ assert_param(IS_TIM_LIST8_PERIPH(TIMx)); /* Get the Capture 1 Register value */ return TIMx->CCR1; }
/** * @brief Gets the TIMx Counter value. * @param TIMx: where x can be 1 to 17 to select the TIM peripheral. * @retval Counter Register value. */ uint16_t TIM_GetCounter(TIM_TypeDef* TIMx) { /* Check the parameters */ assert_param(IS_TIM_ALL_PERIPH(TIMx)); /* Get the Counter Register value */ return TIMx->CNT; }
当捕获成功时,TIM_GetCapture1()和TIM_GetCounter()得到的值一样吗?
TIM_GetCapture1对应寄存器CRR1,TIM_GetCounter对应寄存器CNT
答:
看你处理的速度了,
正常来说TIM_GetCapture1才是最准确的.完全硬件级别的保存.
捕获/比较寄存器 1: TIMx_CCR1,该寄存器用来存储捕获发生时, TIMx_CNT的值;
我们从 TIMx_CCR1 就可以读出通道 1 捕获发生时刻的 TIMx_CNT 值