eeprom.rar_stm32f4 eprom

//-------------------------------------------------------------- // File : stm32_ub_ee_flash.c // Datum : 05.09.2013 // Version : 1.0 // Autor : UB // EMail : mc-4u(@)t-online.de // Web : www.mikrocontroller-4u.de // CPU : STM32F4 // IDE : CooCox CoIDE 1.7.4 // GCC : 4.7 2012q4 // Module : FLASH // Funktion : virtuelles EEprom (per internem Flash) // // Hinweise : // // 1. es werden zwei 16k Flash-Bl鯿ke zum speichern // der EEprom-Daten benutzt // 2. der schreib/lese zugriff wird von zwei Funktionen verwaltet // 3. die VCC der CPU muss zwischen 2.7 und 3,3V liegen !! // 4. zur Funktionsweise siehe : Application note AN3969 // //-------------------------------------------------------------- //-------------------------------------------------------------- // Includes //-------------------------------------------------------------- #include "stm32_ub_ee_flash.h" //-------------------------------------------------------------- // interne Funktionen //-------------------------------------------------------------- FLASH_Status EE_Format(void); uint16_t EE_FindValidPage(uint8_t Operation); uint16_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data); uint16_t EE_PageTransfer(uint16_t VirtAddress, uint16_t Data); //-------------------------------------------------------------- // init vom virtuellen EEprom // Return_wert : // -> ERROR , wenn Fehler beim Init // -> SUCCESS , wenn Init vom virtuellen EEProm ok //-------------------------------------------------------------- ErrorStatus UB_EE_FLASH_Init(void) { uint16_t PageStatus0, PageStatus1; uint16_t VarIdx; uint16_t status_wert; int16_t x = -1; int32_t read_wert; uint16_t data_wert; FLASH_Unlock(); PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS); PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS); switch (PageStatus0) { case EE_ERASED : if (PageStatus1 == EE_VALID_PAGE) { status_wert = FLASH_EraseSector(PAGE0_ID,VOLTAGE_RANGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } } else if (PageStatus1 == EE_RECEIVE_DATA) { status_wert = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } status_wert = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, EE_VALID_PAGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } } else { status_wert = EE_Format(); if (status_wert != FLASH_COMPLETE) { return ERROR; } } break; case EE_RECEIVE_DATA : if (PageStatus1 == EE_VALID_PAGE) { x=-1; for (VarIdx = 0; VarIdx < EE_FLASH_MAX_ADR; VarIdx++) { if (( *(__IO uint16_t*)(PAGE0_BASE_ADDRESS + 6)) == VarIdx) { x = VarIdx; } if (VarIdx != x) { read_wert = UB_EE_FLASH_Read(VarIdx); if (read_wert >= 0) { data_wert=(uint16_t)(read_wert); status_wert = EE_VerifyPageFullWriteVariable(VarIdx, data_wert); if (status_wert != FLASH_COMPLETE) { return ERROR; } } } } status_wert = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, EE_VALID_PAGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } status_wert = FLASH_EraseSector(PAGE1_ID, VOLTAGE_RANGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } } else if (PageStatus1 == EE_ERASED) { status_wert = FLASH_EraseSector(PAGE1_ID, VOLTAGE_RANGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } status_wert = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, EE_VALID_PAGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } } else { status_wert = EE_Format(); if (status_wert != FLASH_COMPLETE) { return ERROR; } } break; case EE_VALID_PAGE : if (PageStatus1 == EE_VALID_PAGE) { status_wert = EE_Format(); if (status_wert != FLASH_COMPLETE) { return ERROR; } } else if (PageStatus1 == EE_ERASED) { status_wert = FLASH_EraseSector(PAGE1_ID, VOLTAGE_RANGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } } else { x=-1; for (VarIdx = 0; VarIdx < EE_FLASH_MAX_ADR; VarIdx++) { if ((*(__IO uint16_t*)(PAGE1_BASE_ADDRESS + 6)) == VarIdx) { x = VarIdx; } if (VarIdx != x) { read_wert = UB_EE_FLASH_Read(VarIdx); if (read_wert >= 0) { data_wert=(uint16_t)(read_wert); status_wert = EE_VerifyPageFullWriteVariable(VarIdx, data_wert); if (status_wert != FLASH_COMPLETE) { return ERROR; } } } } status_wert = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, EE_VALID_PAGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } status_wert = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE); if (status_wert != FLASH_COMPLETE) { return ERROR; } } break; default : status_wert = EE_Format(); if (status_wert != FLASH_COMPLETE) { return ERROR; } break; } return SUCCESS; } //-------------------------------------------------------------- // Daten aus virtuellem EEprom lesen // VirtAddress : [0...EE_FLASH_MAX_ADR-1] // Return_wert : // [0...65535] : wenn Inhalt von Adresse ausgelesen wurde // [-1] : Adresse nicht g黮tig // [-2] : Flash noch nicht initialisiert // [-3] : Adresse wurde im Flash nicht gefunden //-------------------------------------------------------------- int32_t UB_EE_FLASH_Read(uint16_t VirtAddress) { int32_t ret_wert=-3; uint16_t wert; uint16_t ValidPage; uint16_t AddressValue; uint32_t Address, PageStartAddress; if(VirtAddress>=EE_FLASH_MAX_ADR) { return -1; } ValidPage = EE_FindValidPage(READ_FROM_VALID_PAGE); if(ValidPage==EE_PAGE0) { PageStartAddress = (uint32_t)(PAGE0_BASE_ADDRESS); Address = (uint32_t)(PAGE0_END_ADDRESS-1); } else if(ValidPage==EE_PAGE1) { PageStartAddress = (uint32_t)(PAGE1_BASE_ADDRESS); Address = (uint32_t)(PAGE1_END_ADDRESS-1); } else { return -2; } ret_wert=-3; while (Address > (PageStartAddress + 2)) { AddressValue = (*(__IO uint16_t*)Address); if (AddressValue == VirtAddress) { wert = (*(__IO uint16_t*)(Address - 2)); ret_wert=0; break; } else { Address = Address - 4; } } if(ret_wert==0) { // ausgelesenen Datenwert zur點kgeben ret_wert=(int32_t)(wert); } return ret_wert; } //-------------------------------------------------------------- // Daten in virtuelles EEprom speichern // VirtAddress : [0...EE_FLASH_MAX_ADR-1] // Data : [0...65535] // Return_wert : // [0] : schreiben OK // [-1] : Adresse nicht g黮tig // [-2] : sonstiger Fehler //-------------------------------------------------------------- int32_t UB_EE_FLASH_Write(uint16_t VirtAddress, uint16_t Data) { uint16_t Status = EE_NO_ERROR; if(VirtAddress>=EE_FLASH_MAX_ADR) { return -1; } Status = EE_VerifyPageFullWriteVariable(VirtAddress, Data); if (Status == EE_PAGE_FULL) { Status = EE_PageTransfer(VirtAddress, Data); } if(Status != FLASH_COMPLETE) { return -2; } return 0; } //-------------------------------------------------------------