以CH32V307为例，配置方法如下：
关于给定义的变量赋值，注意要通过FLASH编程操作写入，将值写入FLASH该位置。完成后可直接通过读取该变量获取该值。如下图：
配置代码如下：
/********************************** (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
USART Print debugging routine:
USART1_Tx(PA9).
This example demonstrates using USART1(PA9) as a print debug port output.
*/
#include "debug.h"
/* Global typedef */
/* Global define */
/* Global Variable */
volatile u8 flag __attribute__((section(".TEST")));
//读取指定地址的一个字节(8位数据)
uint8_t FLASH_ReadByte(uint32_t address)
{
return *(__IO uint8_t*)address;
}
void Flash_Program(uint32_t Address, uint16_t Data)
{
FLASH_Unlock();
FLASH_ErasePage(Address);
FLASH_ProgramHalfWord(Address, Data);
}
/*********************************************************************
* @fn main
*
* @brief Main program.
*
* @return none
*/
int main(void)
{
u8 i=0;
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() );
printf("This is printf example\r\n");
while(1)
{
i++;
Flash_Program(0x0800F000,i);
printf("flag:%d\r\n",flag);
printf("u8:%02x\r\n",FLASH_ReadByte(0x0800F000));
Delay_Ms(1000);
}
}