/********************************** (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
 *HSI or HSI/2 as PLL input clock routine:
 *This example demonstrates that HSI or HSI/2 is used as the PLL input clock, and the
 *system clock uses the PLL as the clock source.
 *Refer to system_ch32v20x.c, system_ch32v20x.h.
 *HSI is used as the PLL input clock, and the demonstration system clocks are 24MHz, 48MHz, and 72MHz.
 *HSI/2 is used as the PLL input clock, and the demonstration system clock is 24MHz, 48MHz
 *
 */
#include "debug.h"

#define HSI      0   //HSI
#define HSI_1_2  1   //HSI/2

#define PLL_Source   HSI
//#define PLL_Source   HSI_1_2

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    SystemCoreClockUpdate();
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n",SystemCoreClock);
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );

    while(1);
}