我用定時器9配置更新中斷，在主函數(shù)讀取cnt寄存器的值可以讀到值一直在變化，但是配置輸入捕獲讀到的一直是0，觸發(fā)捕獲中斷不應(yīng)該是cnt的值存入ccr嗎，ccr讀到值但是感覺不太對，我現(xiàn)在要搞紅外得讀取準確時間

你好，可以試試tim9的通道3

/********************************** (C) COPYRIGHT *******************************

* File Name? ? ? ? ? : main.c

* Author? ? ? ? ? ? ?: WCH

* Version? ? ? ? ? ? : V1.0.0

* Date? ? ? ? ? ? ? ?: 2021/06/06

* Description? ? ? ? : Main program body.

*********************************************************************************

* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.

* Attention: This software (modified or not) and binary are used for?

* microcontroller manufactured by Nanjing Qinheng Microelectronics.

*******************************************************************************/

/*

?*@Note

Input capture routine:

?TIM1_CH1(PA8)

?This example demonstrates the TIM_CH1(PA8) pin floating input, which detects an edge

? transition to trigger a TIM1 capture interrupt,

?The rising edge triggers the TIM_IT_CC1 interrupt, and the falling edge triggers the

? TIM_IT_CC2 interrupt.

?

*/

#include "debug.h"

/*********************************************************************

?* @fn? ? ? Input_Capture_Init

?*

?* @brief? ?Initializes TIM1 input capture.

?*

?* @param? ?arr - the period value.

?*? ? ? ? ? psc - the prescaler value.

?*? ? ? ? ? ccp - the pulse value.

?*

?* @return? none

?*/

void Input_Capture_Init( u16 arr, u16 psc )

{

GPIO_InitTypeDef GPIO_InitStructure={0};

TIM_ICInitTypeDef TIM_ICInitStructure={0};

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0};

NVIC_InitTypeDef NVIC_InitStructure={0};

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM9, ENABLE );

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init( GPIOA, &GPIO_InitStructure);

GPIO_ResetBits( GPIOA, GPIO_Pin_4 );

TIM_TimeBaseInitStructure.TIM_Period = arr;

TIM_TimeBaseInitStructure.TIM_Prescaler = psc;

TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;

TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInitStructure.TIM_RepetitionCounter =? 0x00;

TIM_TimeBaseInit( TIM9, &TIM_TimeBaseInitStructure);

TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;

TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;

TIM_ICInitStructure.TIM_ICFilter = 0x00;

TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;

TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;

// TIM_PWMIConfig( TIM1, &TIM_ICInitStructure );

TIM_ICInit(TIM9, &TIM_ICInitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM9_CC_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

TIM_ITConfig( TIM9, TIM_IT_CC3, ENABLE );

TIM_SelectInputTrigger( TIM9, TIM_TS_TI1FP1 );

TIM_SelectSlaveMode( TIM9, TIM_SlaveMode_Reset );

TIM_SelectMasterSlaveMode( TIM9, TIM_MasterSlaveMode_Enable );

TIM_Cmd( TIM9, ENABLE );

}

/*********************************************************************

?* @fn? ? ? main

?*

?* @brief? ?Main program.

?*

?* @return? none

?*/

int main(void)

{

USART_Printf_Init(115200);

SystemCoreClockUpdate();

printf("SystemClk:%d\r\n",SystemCoreClock);

printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );

? ? Input_Capture_Init( 0xFFFF, 48000-1 );

while(1);

}

/********************************** (C) COPYRIGHT *******************************

* File Name? ? ? ? ? : ch32v30x_it.c

* Author? ? ? ? ? ? ?: WCH

* Version? ? ? ? ? ? : V1.0.0

* Date? ? ? ? ? ? ? ?: 2024/03/06

* Description? ? ? ? : Main Interrupt Service Routines.

*********************************************************************************

* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.

* Attention: This software (modified or not) and binary are used for?

* microcontroller manufactured by Nanjing Qinheng Microelectronics.

*******************************************************************************/

#include "ch32v30x_it.h"

void NMI_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

void HardFault_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

void TIM9_CC_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

/*********************************************************************

?* @fn? ? ? NMI_Handler

?*

?* @brief? ?This function handles NMI exception.

?*

?* @return? none

?*/

void NMI_Handler(void)

{

? while (1)

? {

? }

}

/*********************************************************************

?* @fn? ? ? HardFault_Handler

?*

?* @brief? ?This function handles Hard Fault exception.

?*

?* @return? none

?*/

void HardFault_Handler(void)

{

? while (1)

? {

? }

}

/*********************************************************************

?* @fn? ? ? TIM1_CC_IRQHandler

?*

?* @brief? ?This function handles TIM1? Capture Compare Interrupt exception.

?*

?* @return? none

?*/

void TIM9_CC_IRQHandler(void)

{

if( TIM_GetITStatus( TIM9, TIM_IT_CC3 ) != RESET )

{

printf( "CH3_Val:%d\r\n", TIM_GetCapture3( TIM9 ) );

}

TIM_ClearITPendingBit( TIM9, TIM_IT_CC1 | TIM_IT_CC3 );

}

我現(xiàn)在主循環(huán)每隔一秒會串口打印，用的串口2(PA2)，讀到的時間是有問題的，串口1沒問題，PA2是通道1是不是還是影響到定時器了？