STM32F4--FLASH读写demo_stm32f4 flash读写例程

作者：算法设计者 | 2024-01-31 14:03:36

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stm32f4 flash读写例程

最近在写机器人的姿态解算，需要把一些数据保存到stm32f4的内部Flash中。于是调了一下午Flash，整理出了下面这个demo程序。发现stm32f4的功能还挺强的，

8位、16位、32位、64位的数据都能读写。而且还能写入负数，虽然库里提供的函数写数据的类型是无符号的，我也不知道这是什么原因。

flash.c


#include "flash.h"
 
/****************************************************************************
* 功    能: 获取地址Address对应的sector编号
* 入口参数：地址
* 出口参数：sector编号
* 说    明：无
* 调用方法：无
****************************************************************************/
uint16_t Flash_GetSector(uint32_t Address)
{
	uint16_t sector = 0;
	if((Address < ADDR_FLASH_SECTOR_1) && (Address >= ADDR_FLASH_SECTOR_0))
	{
		sector = FLASH_Sector_0;  
	}
	else if((Address < ADDR_FLASH_SECTOR_2) && (Address >= ADDR_FLASH_SECTOR_1))
	{
		sector = FLASH_Sector_1;  
	}
	else if((Address < ADDR_FLASH_SECTOR_3) && (Address >= ADDR_FLASH_SECTOR_2))
	{
		sector = FLASH_Sector_2;  
	}
	else if((Address < ADDR_FLASH_SECTOR_4) && (Address >= ADDR_FLASH_SECTOR_3))
	{
		sector = FLASH_Sector_3;  
	}
	else if((Address < ADDR_FLASH_SECTOR_5) && (Address >= ADDR_FLASH_SECTOR_4))
	{
		sector = FLASH_Sector_4;  
	}
	else if((Address < ADDR_FLASH_SECTOR_6) && (Address >= ADDR_FLASH_SECTOR_5))
	{
		sector = FLASH_Sector_5;  
	}
	else if((Address < ADDR_FLASH_SECTOR_7) && (Address >= ADDR_FLASH_SECTOR_6))
	{
		sector = FLASH_Sector_6;  
	}	
	else if((Address < ADDR_FLASH_SECTOR_8) && (Address >= ADDR_FLASH_SECTOR_7))
	{
		sector = FLASH_Sector_7;  
	}
	else if((Address < ADDR_FLASH_SECTOR_9) && (Address >= ADDR_FLASH_SECTOR_8))
	{
		sector = FLASH_Sector_8;  
	}
	else if((Address < ADDR_FLASH_SECTOR_10) && (Address >= ADDR_FLASH_SECTOR_9))
	{
		sector = FLASH_Sector_9;  
	}
	else if((Address < ADDR_FLASH_SECTOR_11) && (Address >= ADDR_FLASH_SECTOR_10))
	{
		sector = FLASH_Sector_10;  
	}
	else/*(Address < FLASH_END_ADDR) && (Address >= ADDR_FLASH_SECTOR_11))*/
	{
		sector = FLASH_Sector_11;  
	}
	return sector;
}
 
/****************************************************************************
* 功    能: 擦除指定扇区
* 入口参数：SectorNum 扇区号
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void Flash_EraseSector(uint16_t SectorNum)
{
	FLASH_Unlock(); 
	FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | 
                  FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);
	if (FLASH_EraseSector(SectorNum, VoltageRange_3) != FLASH_COMPLETE) while (1);
	FLASH_Lock(); 
}
 
/****************************************************************************
* 功    能: 写入长度为length的32位数据
* 入口参数：address：地址
			length： 数据长度
			data_32：要写入的数据指针
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void Flash_Write32BitDatas(uint32_t address, uint16_t length, int32_t* data_32)
{
	uint16_t StartSector, EndSector,i;
	FLASH_Unlock(); //解锁FLASH后才能向FLASH中写数据。
	FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | 
                  FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);
	StartSector = Flash_GetSector(address);  //获取FLASH的Sector编号
	EndSector = Flash_GetSector(address+4*length);
	for (i = StartSector; i < EndSector; i += 8)  //每次FLASH编号增加8，可参考上边FLASH Sector的定义。
	{
		if (FLASH_EraseSector(i, VoltageRange_3) != FLASH_COMPLETE) while (1);
	}
	for(i=0; i<length; i++)
	{
		if (FLASH_ProgramWord(address, data_32[i]) == FLASH_COMPLETE)   //将DATA_32写入相应的地址。
		{
		    address = address + 4;
		}
		else
		{ 
			while (1);
		}
	}
	FLASH_Lock();  //读FLASH不需要FLASH处于解锁状态。
}
 
/****************************************************************************
* 功    能: 读取长度为length的32位数据
* 入口参数：address：地址
			length： 数据长度
			data_32  指向读出的数据
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void Flash_Read32BitDatas(uint32_t address, uint16_t length, int32_t* data_32)
{
	uint8_t i;
	for(i=0; i<length; i++)
	{
		data_32[i]=*(__IO int32_t*)address;
		address=address + 4;
	}
}
 
/****************************************************************************
* 功    能: 写入长度为length的16位数据
* 入口参数：address：地址
			length： 数据长度
			data_16：要写入的数据指针
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void Flash_Write16BitDatas(uint32_t address, uint16_t length, int16_t* data_16)
{
	uint16_t StartSector, EndSector,i;
	FLASH_Unlock(); //解锁FLASH后才能向FLASH中写数据。
	FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | 
                  FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);
	StartSector = Flash_GetSector(address);  //获取FLASH的Sector编号
	EndSector = Flash_GetSector(address+2*length);
	for (i = StartSector; i < EndSector; i += 8)  //每次FLASH编号增加8，可参考上边FLASH Sector的定义。
	{
		if (FLASH_EraseSector(i, VoltageRange_3) != FLASH_COMPLETE) while (1);
	}
	for(i=0; i<length; i++)
	{
		if (FLASH_ProgramHalfWord(address, data_16[i]) == FLASH_COMPLETE)   
		{
		    address = address + 2;
		}
		else
		{ 
			while (1);
		}
	}
	FLASH_Lock();  //读FLASH不需要FLASH处于解锁状态。
}
 
/****************************************************************************
* 功    能: 读取长度为length的16位数据
* 入口参数：address：地址
			length： 数据长度
			data_16  指向读出的数据
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void Flash_Read16BitDatas(uint32_t address, uint16_t length, int16_t* data_16)
{
	uint8_t i;
	for(i=0; i<length; i++)
	{
		data_16[i]=*(__IO int16_t*)address;
		address=address + 2;
	}
}
 
/****************************************************************************
* 功    能: 写入长度为length的8位数据
* 入口参数：address：地址
			length： 数据长度
			data_8：要写入的数据指针
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void Flash_Write8BitDatas(uint32_t address, uint16_t length, int8_t* data_8)
{
	uint16_t StartSector, EndSector,i;
	FLASH_Unlock(); //解锁FLASH后才能向FLASH中写数据。
	FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | 
                  FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);
	StartSector = Flash_GetSector(address);  //获取FLASH的Sector编号
	EndSector = Flash_GetSector(address+length);
	for (i = StartSector; i < EndSector; i += 8)  //每次FLASH编号增加8，可参考上边FLASH Sector的定义。
	{
		if (FLASH_EraseSector(i, VoltageRange_3) != FLASH_COMPLETE) while (1);
	}
	for(i=0; i<length; i++)
	{
		if (FLASH_ProgramByte(address, data_8[i]) == FLASH_COMPLETE)   
		{
		    address++;
		}
		else
		{ 
			while (1);
		}
	}
	FLASH_Lock();  //读FLASH不需要FLASH处于解锁状态。
}
 
/****************************************************************************
* 功    能: 读取长度为length的8位数据
* 入口参数：address：地址
			length： 数据长度
			data_8  指向读出的数据
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void Flash_Read8BitDatas(uint32_t address, uint16_t length, int8_t* data_8)
{
	uint8_t i;
	for(i=0; i<length; i++)
	{
		data_8[i]=*(__IO int8_t*)address;
		address++;
	}
}

flash.h


#ifndef __FLASH_H__
#define __FLASH_H__
 
#include "stm32f4xx.h"
 
/* Base address of the Flash sectors */
#define ADDR_FLASH_SECTOR_0     ((uint32_t)0x08000000) /* Base @ of Sector 0, 16 Kbytes */
#define ADDR_FLASH_SECTOR_1     ((uint32_t)0x08004000) /* Base @ of Sector 1, 16 Kbytes */
#define ADDR_FLASH_SECTOR_2     ((uint32_t)0x08008000) /* Base @ of Sector 2, 16 Kbytes */
#define ADDR_FLASH_SECTOR_3     ((uint32_t)0x0800C000) /* Base @ of Sector 3, 16 Kbytes */
#define ADDR_FLASH_SECTOR_4     ((uint32_t)0x08010000) /* Base @ of Sector 4, 64 Kbytes */
#define ADDR_FLASH_SECTOR_5     ((uint32_t)0x08020000) /* Base @ of Sector 5, 128 Kbytes */
#define ADDR_FLASH_SECTOR_6     ((uint32_t)0x08040000) /* Base @ of Sector 6, 128 Kbytes */
#define ADDR_FLASH_SECTOR_7     ((uint32_t)0x08060000) /* Base @ of Sector 7, 128 Kbytes */
#define ADDR_FLASH_SECTOR_8     ((uint32_t)0x08080000) /* Base @ of Sector 8, 128 Kbytes */
#define ADDR_FLASH_SECTOR_9     ((uint32_t)0x080A0000) /* Base @ of Sector 9, 128 Kbytes */
#define ADDR_FLASH_SECTOR_10    ((uint32_t)0x080C0000) /* Base @ of Sector 10, 128 Kbytes */
#define ADDR_FLASH_SECTOR_11    ((uint32_t)0x080E0000) /* Base @ of Sector 11, 128 Kbytes */
 
#define FLASH_USER_START_ADDR ADDR_FLASH_SECTOR_9	//用户起始地址，暂定为第十个扇区的起始地址
 
//API
uint16_t Flash_GetSector(uint32_t Address);
void Flash_EraseSector(uint16_t SectorNum);
 
void Flash_Write32BitDatas(uint32_t address, uint16_t length, int32_t* data_32);
void Flash_Read32BitDatas(uint32_t address, uint16_t length, int32_t* data_32);
 
void Flash_Write16BitDatas(uint32_t address, uint16_t length, int16_t* data_16);
void Flash_Read16BitDatas(uint32_t address, uint16_t length, int16_t* data_16);
 
void Flash_Write8BitDatas(uint32_t address, uint16_t length, int8_t* data_8);
void Flash_Read8BitDatas(uint32_t address, uint16_t length, int8_t* data_8);
 
 
#endif

usart.c


#include "usart.h"
 
/****************************************************************************
* 名    称：void USART_Configuration(void)
* 功    能: UART4配置
* 入口参数：无
* 出口参数：无
* 说    明：无
* 调用方法：无
****************************************************************************/
void USART_Configuration(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure; 	
	
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    
    GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_UART4);
    GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_UART4);
	
	USART_InitStructure.USART_BaudRate = 19200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(UART4,&USART_InitStructure);   
    USART_Cmd(UART4,ENABLE);
}
 
/****************************************************************************
* 名    称：int fputc(int ch, FILE *f)
* 功    能: 重定向printf到串口
* 入口参数: 略
* 出口参数：略
* 说    明：无
* 调用方法：无
****************************************************************************/
int fputc(int ch, FILE *f)
{	
	while (USART_GetFlagStatus(UART4, USART_FLAG_TC) == RESET);
	USART_SendData(UART4, (uint8_t) ch);
	while (USART_GetFlagStatus(UART4, USART_FLAG_TC) == RESET);
	return ch;
}
 
/****************************************************************************
* 名    称：int fgetc(FILE *f) 
* 功    能: 重定向scanf到串口
* 入口参数：略
* 出口参数：略
* 说    明：无
* 调用方法：无
****************************************************************************/
int fgetc(FILE *f) 
{
    int ch;
    while (USART_GetFlagStatus(UART4, USART_FLAG_RXNE) == RESET);
    ch = USART_ReceiveData(UART4);
    while (USART_GetFlagStatus(UART4, USART_FLAG_TC) == RESET);
    USART_SendData(UART4, (uint8_t) ch);
    return ch;
}

usart.h


#ifndef __PRINTF_H__
#define __PRINTF_H__
 
#include <stdio.h>
#include "stm32f4xx.h"
 
//供调用的API
void USART_Configuration(void);
 
#endif

main.c


#include "stm32f4xx.h"
#include "flash.h"
#include "usart.h"
 
void RCC_Configuration(void)
{
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);	/* Enable GPIO clock */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE); /* Enable USART clock */
}
 
int32_t data_32_1[]={-1,-2,-3,-4,-5,-6,-7,-8,-9,-10};
int32_t data_32_2[10];
int16_t data_16_1[]={1,2,3,4,5,6,7,8,9,10};
int16_t data_16_2[]={0,0,0,0,0,0,0,0,0,0};
int8_t data_8_1[]={1,2,3,4,5,6,7,8,9,10};
int8_t data_8_2[]={0,0,0,0,0,0,0,0,0,0};
 
int main()
{
	uint8_t j;
	RCC_Configuration();
	USART_Configuration();
	
	printf("\r\n32位数据：");
	printf("\r\n擦除前：");
	Flash_Read32BitDatas(FLASH_USER_START_ADDR,10,data_32_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_32_2[j]);
	}
	Flash_EraseSector(FLASH_Sector_9);
	
	printf("\r\n擦除后：");
	Flash_Read32BitDatas(FLASH_USER_START_ADDR,10,data_32_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_32_2[j]);
	}
	
	printf("\r\n读写Flash后：");
	Flash_Write32BitDatas(FLASH_USER_START_ADDR, 10, data_32_1);
	Flash_Read32BitDatas(FLASH_USER_START_ADDR,10,data_32_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_32_2[j]);
	}
	
	printf("\r\n16位数据：");
	printf("\r\n擦除前：");
	Flash_Read16BitDatas(FLASH_USER_START_ADDR,10,data_16_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_16_2[j]);
	}
	Flash_EraseSector(FLASH_Sector_9);
	
	printf("\r\n擦除后：");
	Flash_Read16BitDatas(FLASH_USER_START_ADDR,10,data_16_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_16_2[j]);
	}
	
	printf("\r\n读写Flash后：");
	Flash_Write16BitDatas(FLASH_USER_START_ADDR, 10, data_16_1);
	Flash_Read16BitDatas(FLASH_USER_START_ADDR,10,data_16_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_16_2[j]);
	}
	
	printf("\r\n8位数据：");
	printf("\r\n擦除前：");
	Flash_Read8BitDatas(FLASH_USER_START_ADDR,10,data_8_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_8_2[j]);
	}
	Flash_EraseSector(FLASH_Sector_9);
	
	printf("\r\n擦除后：");
	Flash_Read8BitDatas(FLASH_USER_START_ADDR,10,data_8_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_8_2[j]);
	}
	
	printf("\r\n读写Flash后：");
	Flash_Write8BitDatas(FLASH_USER_START_ADDR, 10, data_8_1);
	Flash_Read8BitDatas(FLASH_USER_START_ADDR,10,data_8_2);
	for(j=0; j<10; j++)
	{
		printf("%d ",data_8_2[j]);
	}
	while(1);
}

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