说明

对STM32内部的flash进行结构体数据存储，和读取。方便小型工程的数据掉电保存。 在初次使用的时候进行自动初始化默认值，后续掉电就不会再初始化了。

直接上代码

代码中的DATA_STORE需要自行定义结构体变量。

#include "store.h" #define FLASH_START 0x0803D800//flash起始地址 extern STORE_SHEET DATA_STORE;//数据存储结构体 extern u16 crc_cal_by_byte(const u8* ptr, u32 len,u16 crc);//CRC校验函数 static u32 size = sizeof(STORE_SHEET); void WriteDataToFlash(void){//写函数 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))); //必须写入整字 FLASH_Lock(); } //================================================================================================================== //++++++++++++++读写安全套接层 //================================================================================================================== void READ_CHECK(void)//读安全校验 { 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)//写安全校验 { 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(); } //================================================================================================================== //++++掉电数据体初始化默认值++++++数据读出接口++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ //================================================================================================================== void STORE_ConfigInitPara(void) { READ_CHECK(); if(DATA_STORE.MAGIC != MAGIC_FLAG) { memset(&DATA_STORE,0,sizeof(STORE_SHEET)); DATA_STORE.MAGIC = MAGIC_FLAG;//初始化掉电数据宏 //============================================================== //==F410 掉电保存初值 ==// //--TIMER DATA_STORE.STD_TIME = 14400; //关机定时发送时间 14400s DATA_STORE.HEART = 10; //--WIFI memset(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); //--LIMITER DATA_STORE.LIMITER.POWER_LIMIT = 11.5; //低电电压 DATA_STORE.LIMITER.SPEED_LIMIT = 15; //速度限制 DATA_STORE.LIMITER.LOCK_ACTION =0; //1正常使用 //0强制关机 //--GPS DATA_STORE.GPSS.latitude = 31.782533; DATA_STORE.GPSS.longitude = 117.34911; //--FLASH_StoreBuffer_cnt DATA_STORE.HIS.ADDO = 0; //Address where data starts DATA_STORE.HIS.ADDW = 0; //Address where data ends //执行写入 STORE_DATA(); } } static _Bool restore = false; //====================================================数据存入接口 u8 STORE_DATA(void) { DATA_STORE.MAGIC = MAGIC_FLAG; if(restore) DATA_STORE.MAGIC = 0xffffffff;//清除掉电数据恢复出厂设置 WRITE_CHECK();//写安全校验 return 1; } //===================================================主动重新初始化掉电数据配置 void set_restore(void) { restore = true; }

头文件

#ifndef _STORE_H #define _STORE_H #include "sys.h" /* 掉电数据存储表 */ //============================================================================================== void STORE_ConfigInitPara(void); //读取和配置函数 u8 STORE_DATA(void); //结构体数据存储FLASH void set_restore(void); //清除FLASH掉电数据 #endif

crc_cal_by_byte校验函数提供如下

const unsigned int crc_ta_8[256]={ /* CRC 字节余式表 */ 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; }