最近做到的项目在运行需要把一组uint8_t(unsigned char)的数据进行掉电储存，想到单片机STM32f030f4p6内部flash可以直接由程序操作，写了以下代码用于uint8_t数据打包保存和读取。
1、程序清单 与 测试结果
本程序包含5个文件,分别是：
1、Flash.c：内部flash读取储存相关函数
2、Flash.h：flash头文件
3、USART1.c：STM32F030F4P6的串口驱动，串口仅用于打印数据观察。
4、USART1.h：串口头文件
5、main.c：防止程序主入口
1、Flash.c
#include "Flash.h" #include "USART1.h" /******************************************************************************* * Function Name : doseFlashHasPackedMessage * Description : Does flash has packed messages * Input : None * Output : * Return : ture/false *******************************************************************************/ bool doseFlashHasPackedMessage(void) { uint16_t length; uint16_t getHead; /*Is head matched*/ getHead = (uint16_t)(*(uint16_t*)(STM32F0xx_FLASH_PAGE15_STARTADDR )); if( EEPPROM_PACKAGEHEAD != getHead ) { return false; } /*Is length zero*/ length = (*(uint16_t*)(STM32F0xx_FLASH_PAGE15_STARTADDR+2)); if( 0 == length) { return false; } return true; } /******************************************************************************* * Function Name : getValuablePackedMessageLengthofFlash * Description : Get valuable packed message length of flash * Input : None * Output : * Return : valuable length *******************************************************************************/ uint16_t getValuablePackedMessageLengthofFlash( void ) { uint16_t length; /*Is head matched*/ if( EEPPROM_PACKAGEHEAD != (*(uint16_t*)(STM32F0xx_FLASH_PAGE15_STARTADDR )) ) { return 0; } /*Get length*/ length = (uint16_t)(*(uint16_t*)(STM32F0xx_FLASH_PAGE15_STARTADDR+2)); return length; } /******************************************************************************* * Function Name : readPackedMessageFromFlash * Description : Read packed message form flash * Input : buff:point to first location of received buffer.length:Maxmum length of reception * Output : * Return : reception length *******************************************************************************/ uint16_t readPackedMessageFromFlash( uint8_t *buff , uint16_t length) { int i; uint16_t getLength; if( !doseFlashHasPackedMessage() ) return 0; /*Get valuable length*/ getLength = getValuablePackedMessageLengthofFlash(); /*Read out message*/ for(i=0;i<MIN(getLength,length);i++) { buff[i]= *(uint8_t*)(STM32F0xx_FLASH_PAGE15_STARTADDR+4+i); } return MIN(getLength,length); } /******************************************************************************* * Function Name : isItOddNumber * Description : is input data an odd number? * Input : number:input data * Output : * Return : true/false *******************************************************************************/ bool isItOddNumber(uint16_t number) { if(0 != number%2) { return true; } return false; } /******************************************************************************* * Function Name : Flash_eeprom_WriteWithPacked * Description : Write a group of datas to flash. * Input : buff:pointer of first data, length: write length * Output : * Return : true/false *******************************************************************************/ bool writeMessageToFlash( uint8_t *buff , uint16_t length) { uint16_t temp; int i; /*Protection*/ if( (length+4) > STM32F0xx_PAGE_SIZE ) { return false; } FLASH_Unlock( ); /*Clear all flags*/ FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPERR ); /*Erase first . Do not rember.*/ if(FLASH_COMPLETE != FLASH_ErasePage(STM32F0xx_FLASH_PAGE15_STARTADDR))//°üº¬Á˵ȴýbusy { return false; } /*Write head*/ FLASH_ProgramHalfWord( STM32F0xx_FLASH_PAGE15_STARTADDR, EEPPROM_PACKAGEHEAD ); /*Write length*/ FLASH_ProgramHalfWord( STM32F0xx_FLASH_PAGE15_STARTADDR+2 , length ); /*Write datas*/ for(i=0 ;i<length/2 ;i++) { temp = buff[2*i]|(uint16_t)buff[2*i+1]<<8; FLASH_ProgramHalfWord( STM32F0xx_FLASH_PAGE15_STARTADDR+4+2*i , temp); } if( isItOddNumber(length) )//Write one more if length is odd number. { temp = (uint16_t)buff[length-1]; FLASH_ProgramHalfWord( STM32F0xx_FLASH_PAGE15_STARTADDR+4+(length-1) , temp); } /*Read out and check*/ for(i=0 ;i<length ;i++) { if( *(uint8_t*)(STM32F0xx_FLASH_PAGE15_STARTADDR+4+i) != buff[i] ) { FLASH_Lock(); return false; } } FLASH_Lock(); return true; } /******************************************************************************* * Function Name : flashReadWriteTest * Description : Flash read write test. * Input : None * Output : None * Return : None *******************************************************************************/ void flashReadWriteTest( void ) { #define testReadWriteNumber 200 uint8_t buff_write[testReadWriteNumber]={0}; uint8_t buff_read[testReadWriteNumber]={0}; uint16_t length; int i; for( i=0;i<testReadWriteNumber;i++) { buff_write[i]=i; } writeMessageToFlash( buff_write , testReadWriteNumber); length = readPackedMessageFromFlash( buff_read , testReadWriteNumber); printf("length=%d\r\n",length); for(i=0;i<length;i++) { printf("read[%d]=%d\r\n",i,buff_read[i]); } while(1); }