stm32f10x eeprom emulation

[FLast.11]

Posted on December 29, 2015 at 03:51

Hello, i gone through AN2954 and to make it simple,

i just get out the eeprom write  & read (don't am i correct to do so) EEprom write: uint16_t EE_WriteVariable(uint16_t VirtAddress, uint16_t Data) {   uint16_t Status = 0;   /* Write the variable virtual address and value in the EEPROM */   Status = EE_VerifyPageFullWriteVariable(VirtAddress, Data);   /* In case the EEPROM active page is full */   if (Status == PAGE_FULL)   {     /* Perform Page transfer */     Status = EE_PageTransfer(VirtAddress, Data);   }   /* Return last operation status */   return Status; } //=================== EEPROM READ uint32_t EEPROM_Read(uint16_t Address) {     uint32_t readValue;     FLASH_Unlock(); //    Address = BANK1_WRITE_START_ADDR;     readValue = (*(__IO uint16_t*) Address);     FLASH_Lock();     return readValue; } However, when i process to do  EE_WriteVariable(200, 14);                       FLASH_Unlock();            test_3 = EEPROM_Read(200); i cannot get the correct value in test_3. Can anyone help? Thanks

[Tesla DeLorean]

Posted on December 29, 2015 at 06:05

Can anyone help?

Look, it's a 32-bit processor, you can't take a 16-bit variable and cast it into an address and expect it to function properly. You'll need to use the EEPROM abstraction to go retrieve your value, I don't think it exists at some linear memory address.

[FLast.11]

Posted on December 29, 2015 at 07:17 Thanks clive, can you explain more as i am new to 32bit world. what i do is take the core out from the following uint16_t EE_ReadVariable(uint16_t VirtAddress, uint16_t* Data); uint16_t EE_WriteVariable(uint16_t VirtAddress, uint16_t Data); and in the readvariable function  //========= uint16_t EE_ReadVariable(uint16_t VirtAddress, uint16_t* Data) {   uint16_t ValidPage = PAGE0;   uint16_t AddressValue = 0x5555, ReadStatus = 1;   uint32_t Address = 0x08010000, PageStartAddress = 0x08010000;   /* Get active Page for read operation */   ValidPage = EE_FindValidPage(READ_FROM_VALID_PAGE);   /* Check if there is no valid page */   if (ValidPage == NO_VALID_PAGE)   {     return  NO_VALID_PAGE;   }   /* Get the valid Page start Address */   PageStartAddress = (uint32_t)(EEPROM_START_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE));   /* Get the valid Page end Address */   Address = (uint32_t)((EEPROM_START_ADDRESS - 2) + (uint32_t)((1 + ValidPage) * PAGE_SIZE));   /* Check each active page address starting from end */   while (Address > (PageStartAddress + 2))   {     /* Get the current location content to be compared with virtual address */     AddressValue = (*(__IO uint16_t*)Address);     /* Compare the read address with the virtual address */     if (AddressValue == VirtAddress)     {       /* Get content of Address-2 which is variable value */       *Data = (*(__IO uint16_t*)(Address - 2));       /* In case variable value is read, reset ReadStatus flag */       ReadStatus = 0;       break;     }     else     {       /* Next address location */       Address = Address - 4;     }   }   /* Return ReadStatus value: (0: variable exist, 1: variable doesn't exist) */   return ReadStatus; } and i just take this out  /* Get content of Address-2 which is variable value */       *Data = (*(__IO uint16_t*)(Address - 2)); //========= i search from internet but no example show the eeprom read. it would be great if someone help. Thanks Jeff