第五十八章、CH32V103应用教程——TIM-定时器和外部触发的...

#ifndef __TIM_H

#define __TIM_H



#include "ch32v10x_conf.h"



/* Slave Mode Definition */

#define RESET_MODE      0

#define GATED_MODE      1

#define TRIGGER__MODE   2



/*  Slave Mode Selection */

//#define SLAVE_MODE   RESET_MODE

//#define SLAVE_MODE   GATED_MODE

#define SLAVE_MODE   TRIGGER__MODE



void TIM1_Synchro_ExtTrigger_Init( u16 arr, u16 psc );



#endif

#include "tim.h"



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

* Function Name  : TIM1_Synchro_ExtTrigger_Init

* Description    : Initializes TIM1 external trigger synchronization.

* Input          : arr: the period value.

*                  psc: the prescaler value.

* Return         : None

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

void TIM1_Synchro_ExtTrigger_Init( u16 arr, u16 psc )

{

    GPIO_InitTypeDef GPIO_InitStructure;

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

    TIM_ICInitTypeDef TIM_ICInitStructure;



    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1, ENABLE );



    //GPIO初始化配置

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;  //输入下拉

    GPIO_Init( GPIOA, &GPIO_InitStructure);

    GPIO_ResetBits( GPIOA, GPIO_Pin_8 );  //将PA8引脚拉低



    //时基结构体初始化配置

    TIM_TimeBaseInitStructure.TIM_Period = arr;  //设置自动重装载寄存器的值

    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;  //设置定时器预分频器值

    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;  //设置时钟分频因子，配置死区时间时需要用到

    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;  //设置计数器计数模式，向上计数

    TIM_TimeBaseInitStructure.TIM_RepetitionCounter =  0x00;  //设置重复计数器的值，没用到不用管

    TIM_TimeBaseInit( TIM1, &TIM_TimeBaseInitStructure);  //初始化定时器



    //输入捕获结构体初始化

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;  //配置输入捕获通道，根据具体GPIO配置

    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;  //设置输入的需要被捕获的信号的分频系数

    TIM_ICInitStructure.TIM_ICFilter = 0x00;  //设置输入的需要被捕获的信号的滤波系数

    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;  //配置输入捕获信号的极性

    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;  //设置输入通道和捕获通道的映射关系

    TIM_ICInit( TIM1, &TIM_ICInitStructure );  //定时器输入捕获初始化



    TIM_SelectInputTrigger( TIM1, TIM_TS_TI1FP1 );  //选择输入触发源



#if (SLAVE_MODE == RESET_MODE)

    TIM_SelectSlaveMode( TIM1, TIM_SlaveMode_Reset );  //复位模式



#elif (SLAVE_MODE == GATED_MODE)

    TIM_SelectSlaveMode( TIM1, TIM_SlaveMode_Gated );  //门控模式



#elif (SLAVE_MODE == TRIGGER__MODE)

    TIM_SelectSlaveMode( TIM1, TIM_SlaveMode_Trigger );  //触发模式



#endif



    TIM_SelectMasterSlaveMode( TIM1, TIM_MasterSlaveMode_Enable );  //使能开启定时器1与其从机之间的同步（通过TRGO）



#if (SLAVE_MODE != TRIGGER__MODE)

    TIM_Cmd( TIM1, ENABLE );  //使能开启TIM1



#endif

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void TIM_SelectSlaveMode(TIM_TypeDef* TIMx, uint16_t TIM_SlaveMode)

{

  TIMx->SMCFGR &= (uint16_t)~((uint16_t)TIM_SMS);

  TIMx->SMCFGR |= TIM_SlaveMode;

}

int main(void)

{

    USART_Printf_Init(115200);

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



    TIM1_Synchro_ExtTrigger_Init( 0xFFFF, 48000-1);



    while(1)

    {

        printf("cnt:%d\r\n", TIM1->CNT);

    }

}