/********************************** (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
 *low power, standby mode routine:
 *WKUP(PA0)
 *This routine demonstrates that WFI enters the standby mode, the rising edge of
 *the WKUP (PA0) pin exits the standby mode,Program reset after wake-up.
 *Note: In order to reduce power consumption as much as possible, it is
 *recommended to set the unused GPIO to pull-down mode.
 *
 */

#include "debug.h"

/* Global define */

/* Global Variable */

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};

    /* To reduce power consumption, unused GPIOs need to be set as pull-down inputs */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|
            RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;

    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_Init(GPIOE, &GPIO_InitStructure);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    SystemCoreClockUpdate();
    Delay_Init();
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n", SystemCoreClock);
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
    printf("Standby Mode Test\r\n");

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

    if(PWR_GetFlagStatus(PWR_FLAG_WU) == SET)
    {
        printf("\r\n Standby wake up reset \r\n");
    }
    else
    {
        printf("\r\n Power on reset \r\n");
        PWR_WakeUpPinCmd(ENABLE);
        PWR_EnterSTANDBYMode();
    }

    printf("\r\n ########## \r\n");
    while(1)
    {
        Delay_Ms(1000);
        printf("Run in main\r\n");
    }
}