first submission

EVT/EXAM/RCC/HSI_PLL_Source/User/main.c

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+/********************************** (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)
+{
+    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
+    USART_Printf_Init(115200);
+    printf("SystemClk:%d\r\n",SystemCoreClock);
+
+    while(1);
+}
+
+
+
+
+
+
+