/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : Main program body.
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * SPDX-License-Identifier: Apache-2.0
 *******************************************************************************/ 

/*
 *@Note
 独立看门狗例程：
 本例程演示 PA0 引脚下拉输入，当输入高电平时，进行喂狗。若不喂狗，
 则 3.2s 后触发独立看门狗复位。

*/

#include "debug.h"

#define KEY0 GPIO_ReadInputDataBit( GPIOA, GPIO_Pin_0)	//PA0

/*********************************************************************
 * @fn      KEY_Init
 *
 * @brief   Initializes KEY GPIO.
 *
 * @return  none
 */
void KEY_Init( void )
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
    GPIO_Init( GPIOA, &GPIO_InitStructure );
}

/*********************************************************************
 * @fn      KEY_PRESS
 *
 * @brief   Key processing funcation.
 *
 * @return  0 - Press the key.
            1 - Release Key.
 */
u8 KEY_PRESS( void )
{
    if( KEY0 == 1 )
    {
        Delay_Ms( 10 );
        return 1;
    }

    return 0;
}

/*********************************************************************
 * @fn      IWDG_Init
 *
 * @brief   Initializes IWDG.
 *
 * @param   IWDG_Prescaler: specifies the IWDG Prescaler value.
 *            IWDG_Prescaler_4 - IWDG prescaler set to 4.
 *            IWDG_Prescaler_8 - IWDG prescaler set to 8.
 *            IWDG_Prescaler_16 - IWDG prescaler set to 16.
 *            IWDG_Prescaler_32 - IWDG prescaler set to 32.
 *            IWDG_Prescaler_64 - IWDG prescaler set to 64.
 *            IWDG_Prescaler_128 - IWDG prescaler set to 128.
 *            IWDG_Prescaler_256 - IWDG prescaler set to 256.
 *          Reload: specifies the IWDG Reload value.
 *            This parameter must be a number between 0 and 0x0FFF.
 *
 * @return  none
 */
void IWDG_Feed_Init( u16 prer, u16 rlr )
{
    IWDG_WriteAccessCmd( IWDG_WriteAccess_Enable );
    IWDG_SetPrescaler( prer );
    IWDG_SetReload( rlr );
    IWDG_ReloadCounter();
    IWDG_Enable();
}

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

    Delay_Init();
    KEY_Init();
    printf( "IWDG test...\r\n" );
    Delay_Ms( 1000 );

    IWDG_Feed_Init( IWDG_Prescaler_32, 4000 );   // 3.2s IWDG reset

    while( 1 )
    {
        if( KEY_PRESS() == 1 )	//PA0
        {
            printf( "Feed dog\r\n" );
            IWDG_ReloadCounter();	//Feed dog
            Delay_Ms( 10 );
        }
    }
}



