/********************************** (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_TIM1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_ResetBits(GPIOA, GPIO_Pin_8);

    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(TIM1, &TIM_TimeBaseInitStructure);

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    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);

    NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_ITConfig(TIM1, TIM_IT_CC1 | TIM_IT_CC2, ENABLE);

    TIM_SelectInputTrigger(TIM1, TIM_TS_TI1FP1);
    TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Reset);
    TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
    TIM_Cmd(TIM1, ENABLE);
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n", SystemCoreClock);

    Input_Capture_Init(0xFFFF, 48000 - 1);

    while(1);
}
