/********************************** (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
 *    when LV is enabled in standby mode, RAM 2k and 30K low-power data holding routines:
 *    This routine demonstrates writing data at the specified location of 2K RAM and 30K RAM,
 *    then WFI enters STANDBY sleep mode and turns on LV,Input high level through PA0 (wakeup) pin
 *    to exit standby mode, print RAM data after waking up, and test whether RAM holds data.
 */

#include "debug.h"

/* Global define */

/* Global Variable */

/*********************************************************************
 * @fn      TestDataWrite
 *
 * @brief   Write 0x11111111 to certain address of 2K RAM and 30K RAM.
 *
 * @return  none
 */
void TestDataWrite(void)
{
    uint32_t myAddr = 0x20000000 + 10 * 1024;
    uint32_t myAddr2 = 0x20000000 + 1 * 1024 + 512;
    uint32_t i = 0;
    for(i = 0; i < 1024; i++) //Write 30K RAM
    {
        *(uint32_t volatile *)(myAddr + (i << 2)) = 0x44444444;
    }
    for(i = 0; i < 1024; i++) //Check 30K RAM
    {
        if((*(uint32_t volatile *)(myAddr + (i << 2))) != 0x44444444)
        {
            printf("Write 30K RAM Error!\r\n");
            break;
        }
    }
    printf("Write 30K RAM Successfully!\r\n");
    for(i = 0; i < 10; i++) //Write 2K RAM
    {
        *(uint32_t volatile *)(myAddr2 + (i << 2)) = 0x44444444;
    }
    for(i = 0; i < 10; i++) //Check 30K RAM
    {
        if((*(uint32_t volatile *)(myAddr2 + (i << 2))) != 0x44444444)
        {
            printf("Write 2K RAM Error!\r\n");
            break;
        }
    }
    printf("Write 2K RAM Successfully!\r\n");
}

/*********************************************************************
 * @fn      TestDataRead
 *
 * @brief   Print the data of certain address of 2K RAM and 30K RAM.
 *
 * @return  none
 */
void TestDataRead(void)
{
    uint32_t myAddr = 0x20000000 + 10 * 1024;
    uint32_t myAddr2 = 0x20000000 + 1 * 1024 + 512;
    uint32_t i = 0;
    printf("2K RAM:\r\n");
    for(i = 0; i < 10; i++){
        printf("0x%08lx=0x%08lx\r\n", myAddr2 + (i << 2), *(uint32_t volatile *)(myAddr2 + (i << 2)));
    }
    printf("32K RAM:\r\n");
    for(i = 0; i < 1024; i++){
        printf("0x%08lx=0x%08lx\r\n", myAddr + (i << 2), *(uint32_t volatile *)(myAddr + (i << 2)));
    }
}

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

    /* Configure unused GPIO as IPD to reduce power consumption */
    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() );

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

    /* Delay 1.5s to avoid entering low power mode immediately after reset*/
    Delay_Ms(1500);
    while(1)
    {
        TestDataRead();
        printf("4.Standby Mode RAM LV Test\r\n");
        TestDataWrite();
        PWR_WakeUpPinCmd(ENABLE);
        PWR_EnterSTANDBYMode_RAM_LV();
        printf("\r\n4.Out \r\n");
        printf("\r\n ########## \r\n");
    }
}