53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : main.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : Main program body.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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/*
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*@Note
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HSI or HSI/2 as PLL input clock routine:
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This example demonstrates that HSI or HSI/2 is used as the PLL input clock, and the
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system clock uses the PLL as the clock source.
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Refer to system_ch32v20x.c, system_ch32v20x.h.
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HSI is used as the PLL input clock, and the demonstration system clocks are 24MHz, 48MHz, and 72MHz.
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HSI/2 is used as the PLL input clock, and the demonstration system clock is 24MHz, 48MHz
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*/
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#include "debug.h"
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#define HSI 0 //HSI
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#define HSI_1_2 1 //HSI/2
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#define PLL_Source HSI
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//#define PLL_Source HSI_1_2
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/*********************************************************************
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* @fn main
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*
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* @brief Main program.
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*
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* @return none
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*/
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int main(void)
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{
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
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USART_Printf_Init(115200);
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printf("SystemClk:%d\r\n",SystemCoreClock);
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while(1);
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}
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