/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.1
 * Date               : 2025/04/26
 * 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 not enabled in standby mode, RAM 2k and 30K data holding routines:
 * This routine demonstrates writing data at the specified location of 2K RAM and 30K RAM(Applicable to
 * CH32V20x_D8 and CH32V20x_D8W,CH32V20x_D6 has a 20K RAM data holding option),then WFI enters STANDBY
 * sleep mode, through the PA0 (wakeup) pin Input high level to exit standby mode, print RAM data after
 * waking up, and test whether RAM is maintained data.
 *
 */

#include "debug.h"

/* Global define */

/* Global Variable */

/*********************************************************************
 * @fn      TestDataWrite
 *
 * @brief   Write data 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)) = 0x33333333;
    }
    for(i=0;i<1024;i++)//Check 30K RAM
    {
        if((*(uint32_t volatile *)(myAddr+(i<<2))) != 0x33333333)
        {
            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)) = 0x33333333;
    }
    for(i=0;i<10;i++)//Check 2K RAM
    {
        if((*(uint32_t volatile *)(myAddr2+(i<<2))) != 0x33333333)
        {
            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};
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    SystemCoreClockUpdate();
    Delay_Init();
    Delay_Ms(1000);
    /* 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_AFIO, ENABLE);
    GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable,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);

    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);

    TestDataRead();
    printf("Standby RAM Mode Test\r\n");
    TestDataWrite();
    PWR_WakeUpPinCmd(ENABLE);
    PWR_EnterSTANDBYMode_RAM();
    while(1);
}