/********************************** (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
 *Independent watchdog routine:
 *This routine demonstrates the pull-down input of the PA0 pin. When the input is high,
 *it will feed the dog. If you don't feed the dog,Then trigger independent watchdog reset after 3.2s.
 *
 */

#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)
{
	SystemCoreClockUpdate();
	USART_Printf_Init(115200);
	printf("SystemClk:%d\r\n",SystemCoreClock);
	printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );

	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);
		}
	}
}