stm32f4 标准库 flash模拟eeprom

#include "stm32f4xx_eeprom.h" #include "delay.h" #include "k7_timer.h" /** * @file : stm32f4xx_eeprom.c * @brief: stm32 flash 模拟 EEPROM * @process : (1) FLASH_Unlock(); //解除flash限制 * (2) EE_Init() //初始化flash * (3) EE_WriteVariable(uint16_t VirtAddress, void *Data, uint16_t len) //写操作 * EE_ReadVariable(uint16_t VirtAddress, void *Data, uint16_t len) //读操作 * (4) FLASH_Lock(); //记得锁住，以免flash随意改动 */ /* Global variable used to store variable value in read sequence */ static uint8_t DatWorkBuf[EEPROM_CELL_DATA_LEN];//data work buffer /* Variable used for Erase sectors under interruption */ static uint16_t EE_FindValidPage(uint8_t Operation); static uint16_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, void *data, uint16_t len); static uint16_t EE_PageTransfer(uint16_t VirtAddress, void *data, uint16_t Len); static uint16_t EE_VerifyPageFullyErased(uint32_t Address); /** * @brief Restore the pages to a known good state in case of page's status * corruption after a power loss. * @param None. * @retval - Flash error code: on write Flash error * - FLASH_COMPLETE: on success */ uint16_t EE_Init(void) { uint16_t PageStatus0 = 6, PageStatus1 = 6; uint16_t VarIdx = 0; uint16_t EepromStatus = 0, ReadStatus = 0; int16_t x0 = -1; FLASH_Status FlashStatus; uint32_t SectorError = 0; FLASH_EraseInitTypeDef pEraseInit; /* Get Page0 status */ PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS); /* Get Page1 status */ PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS); pEraseInit.TypeErase = TYPEERASE_SECTORS; pEraseInit.Sector = PAGE0_ID; pEraseInit.NbSectors = 1; pEraseInit.VoltageRange = VOLTAGE_RANGE; /* Check for invalid header states and repair if necessary */ switch (PageStatus0) { case ERASED: if (PageStatus1 == VALID_PAGE) /* Page0 erased, Page1 valid */ { /* Erase Page0 */ if (!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) { FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } } else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */ { /* Erase Page0 */ if (!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) { FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } /* Mark Page1 as valid */ FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE1_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } else /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */ { /* Erase both Page0 and Page1 and set Page0 as valid page */ FlashStatus = EE_Format(); /* If erase/program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } break; case RECEIVE_DATA: if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */ { /* Transfer data from Page1 to Page0 */ //only data in 2nd cell of page0 is neweset x0 = (*(__IO uint16_t*)(PAGE0_BASE_ADDRESS + EEPROM_CELL_SZ * 2 - EEPROM_CELL_ADDR_LEN)); for (VarIdx = 0; VarIdx < NUM_OF_VAL_CELL; VarIdx++) { if (VarIdx != x0) { /* Read the last variables' updates */ ReadStatus = EE_ReadVariable(VarIdx, DatWorkBuf, EEPROM_CELL_DATA_LEN); /* In case variable corresponding to the virtual address was found */ if (ReadStatus != 0x1) { /* Transfer the variable to the Page0 */ EepromStatus = EE_VerifyPageFullWriteVariable(VarIdx, DatWorkBuf, EEPROM_CELL_DATA_LEN); /* If program operation was failed, a Flash error code is returned */ if (EepromStatus != FLASH_COMPLETE) { return EepromStatus; } } } } /* Mark Page0 as valid */ FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE0_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } pEraseInit.Sector = PAGE1_ID; pEraseInit.NbSectors = 1; pEraseInit.VoltageRange = VOLTAGE_RANGE; /* Erase Page1 */ if (!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) { FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } } else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */ { pEraseInit.Sector = PAGE1_ID; pEraseInit.NbSectors = 1; pEraseInit.VoltageRange = VOLTAGE_RANGE; /* Erase Page1 */ if (!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) { FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } /* Mark Page0 as valid */ FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE0_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } else /* Invalid state -> format eeprom */ { /* Erase both Page0 and Page1 and set Page0 as valid page */ FlashStatus = EE_Format(); /* If erase/program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } } break; case VALID_PAGE: if (PageStatus1 == VALID_PAGE) /* Invalid state -> format ee