說明

對STM32內部的flash進行結構體數據存儲，和讀取。方便小型工程的數據掉電保存。
在初次使用的時候進行自動初始化默認值，后續掉電就不會再初始化了。

直接上代碼

代碼中的DATA_STORE需要自行定義結構體變量。

#include "store.h" #define FLASH_START 0x0803D800//flash起始地址 extern STORE_SHEET DATA_STORE;//數據存儲結構體 extern u16 crc_cal_by_byte(const u8* ptr, u32 len,u16 crc);//CRC校驗函數 static u32 size = sizeof(STORE_SHEET); void WriteDataToFlash(void){//寫函數int i = 0;FLASH_Unlock();FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPTERR | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);FLASH_ErasePage(FLASH_START);for (i = 0; i < size/4; i++)FLASH_ProgramWord(FLASH_START+4 * i, *((u32 *)(((u8 *)&DATA_STORE) + 4 * i))); //必須寫入整字FLASH_Lock(); } //================================================================================================================== //++++++++++++++讀寫安全套接層 //================================================================================================================== void READ_CHECK(void)//讀安全校驗 {u8 cnt = 0; taskENTER_CRITICAL();do memcpy((char *)(&DATA_STORE), (void *)(FLASH_START), size);while(crc_cal_by_byte(((u8 *)&DATA_STORE) + 4, size - 8,998) != DATA_STORE.u32Crc&&cnt++ < 10);taskEXIT_CRITICAL(); } void WRITE_CHECK(void)//寫安全校驗 {u8 cnt = 0; taskENTER_CRITICAL();do{DATA_STORE.u32Crc = crc_cal_by_byte(((u8 *)&DATA_STORE) + 4, sizeof(DATA_STORE) - 8,998); /*CRC CALCULATE*/ WriteDataToFlash();}while(crc_cal_by_byte(((u8 *)FLASH_START) + 4, size - 8,998) != DATA_STORE.u32Crc&&cnt++ < 10);taskEXIT_CRITICAL(); } //================================================================================================================== //++++掉電數據體初始化默認值++++++數據讀出接口++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ //================================================================================================================== void STORE_ConfigInitPara(void) {READ_CHECK();if(DATA_STORE.MAGIC != MAGIC_FLAG) {memset(&DATA_STORE,0,sizeof(STORE_SHEET));DATA_STORE.MAGIC = MAGIC_FLAG;//初始化掉電數據宏//==============================================================//==F410 掉電保存初值 ==////--TIMERDATA_STORE.STD_TIME = 14400; //關機定時發送時間 14400sDATA_STORE.HEART = 10;//--WIFImemset(DATA_STORE.WIFI.SSID,0,32);memset(DATA_STORE.WIFI.PWD,0,32);memcpy(DATA_STORE.WIFI.SSID, "Langyun",7);memcpy(DATA_STORE.WIFI.PWD, "hfly8888",8);//--LIMITERDATA_STORE.LIMITER.POWER_LIMIT = 11.5; //低電電壓 DATA_STORE.LIMITER.SPEED_LIMIT = 15; //速度限制 DATA_STORE.LIMITER.LOCK_ACTION =0; //1正常使用 //0強制關機//--GPSDATA_STORE.GPSS.latitude = 31.782533;DATA_STORE.GPSS.longitude = 117.34911; //--FLASH_StoreBuffer_cntDATA_STORE.HIS.ADDO = 0; //Address where data startsDATA_STORE.HIS.ADDW = 0; //Address where data ends//執行寫入STORE_DATA();} } static _Bool restore = false; //====================================================數據存入接口 u8 STORE_DATA(void) {DATA_STORE.MAGIC = MAGIC_FLAG;if(restore) DATA_STORE.MAGIC = 0xffffffff;//清除掉電數據恢復出廠設置 WRITE_CHECK();//寫安全校驗return 1; } //===================================================主動重新初始化掉電數據配置 void set_restore(void) {restore = true; }

頭文件

#ifndef _STORE_H #define _STORE_H #include "sys.h" /* 掉電數據存儲表 */ //============================================================================================== void STORE_ConfigInitPara(void); //讀取和配置函數 u8 STORE_DATA(void); //結構體數據存儲FLASH void set_restore(void); //清除FLASH掉電數據 #endif

crc_cal_by_byte校驗函數提供如下

const unsigned int crc_ta_8[256]={ /* CRC 字節余式表 */0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 }; u16 crc_cal_by_byte(const u8* ptr, u32 len,u16 crc) {while(len-- != 0){u32 high = (u32)(crc/256); //取CRC高8位crc <<= 8;crc ^= crc_ta_8[high^*ptr];ptr++;}return crc; }

總結

以上是生活随笔為你收集整理的STM32 内部flash 数据掉电存储的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。