Question
STM32F105 eeprom simulation
Posted on January 13, 2015 at 10:27
Hello
I am try write a configuration in a microcontroller STM32F I am using stsw-stm32010 code base example. The example work properly. But when I make my code don't work. I want write my config data from a memory address and after I want read then. I don't have problems with read. But i can't over write the memory position. It is like i write all the data in the same memory position. And i don't understand it.bool EscribeDatosEnFlash(char *Datos, uint32_t offset)
{
u32 i;
u32 tamanho = IndexArrayFin; //strlen(Datos);
uint16_t estado;
// uint16_t VarValue = 0;
// ***********************************************************
// * Success or error status:
// * - FLASH_COMPLETE: on success
// * - PAGE_FULL: if valid page is full
// * - NO_VALID_PAGE: if no valid page was found
// * - Flash error code: on write Flash error
// ************************************************************
FLASH_Unlock();//unlock flash writing
EE_Init();
for (i = 0; i < tamanho; i++)
{
estado = EE_EscribeVariable((EEPROM_START_ADDRESS+i), Datos[i]);
}
FLASH_Lock();//lock the flash for writing
if (estado == FLASH_COMPLETE) return true;
if (estado == PAGE_FULL) return false;
if (estado == NO_VALID_PAGE) return false;
else return true;
}
/**
* @brief Writes/upadtes variable data in EEPROM.
* @param Direcion: Variable address
* @param Dato: 16 bit data to be written
* @retval Success or error status:
* - FLASH_COMPLETE: on success
* - PAGE_FULL: if valid page is full
* - NO_VALID_PAGE: if no valid page was found
* - Flash error code: on write Flash error
*/
uint16_t EE_EscribeVariable(uint32_t Direcion, uint16_t Dato)
{
uint16_t Status = 0;
// Write the variable virtual address and value in the EEPROM
Status = EE_VerificaYEscribeVariable(Direcion, Dato);
// In case the EEPROM active page is full
if (Status == PAGE_FULL)
{
// Perform Page transfer
Status = EE_PageTransfer(Direcion, Dato);
}
// Return last operation status
return Status;
}
/**
* @brief Verifica si la pagina y Escribe en la EEPROM.
* @param Direcion: Variable address
* @param Dato: 16 bit data to be written as variable value
* @retval Success or error status:
* - FLASH_COMPLETE: on success
* - PAGE_FULL: if valid page is full
* - NO_VALID_PAGE: if no valid page was found
* - Flash error code: on write Flash error
*/
uint16_t EE_VerificaYEscribeVariable(uint32_t DirecionIn, uint16_t Dato)
{
FLASH_Status FlashStatus = FLASH_COMPLETE;
uint16_t ValidPage = PAGE0;
uint32_t Address = DirecionIn;
/* Get valid Page for write operation */
ValidPage = EE_FindValidPage(WRITE_IN_VALID_PAGE);
/* Check if there is no valid page */
if (ValidPage == NO_VALID_PAGE)
{
return NO_VALID_PAGE;
}
/* Get the valid Page start Address */
Address = (uint32_t)(DirecionIn + (uint32_t)(ValidPage * PAGE_SIZE));
FlashStatus = FLASH_ProgramHalfWord(Address, Dato);
return FlashStatus;
}
/**
* @brief Verify if active page is full and Writes variable in EEPROM.
* @param VirtAddress: 16 bit virtual address of the variable
* @param Data: 16 bit data to be written as variable value
* @retval Success or error status:
* - FLASH_COMPLETE: on success
* - PAGE_FULL: if valid page is full
* - NO_VALID_PAGE: if no valid page was found
* - Flash error code: on write Flash error
*/
static uint16_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data)
{
FLASH_Status FlashStatus = FLASH_COMPLETE;
uint16_t ValidPage = PAGE0;
uint32_t Address = 0x08010000, PageEndAddress = 0x080107FF;
/* Get valid Page for write operation */
ValidPage = EE_FindValidPage(WRITE_IN_VALID_PAGE);
/* Check if there is no valid page */
if (ValidPage == NO_VALID_PAGE)
{
return NO_VALID_PAGE;
}
/* Get the valid Page start Address */
Address = (uint32_t)(EEPROM_START_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE));
/* Get the valid Page end Address */
PageEndAddress = (uint32_t)((EEPROM_START_ADDRESS - 2) + (uint32_t)((1 + ValidPage) * PAGE_SIZE));
/* Check each active page address starting from begining */
while (Address < PageEndAddress)
{
/* Verify if Address and Address+2 contents are 0xFFFFFFFF */
if ((*(__IO uint32_t*)Address) == 0xFFFFFFFF)
{
/* Set variable data */
FlashStatus = FLASH_ProgramHalfWord(Address, Data);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Set variable virtual address */
FlashStatus = FLASH_ProgramHalfWord(Address + 2, VirtAddress);
/* Return program operation status */
return FlashStatus;
}
else
{
/* Next address location */
Address = Address + 4;
}
}
/* Return PAGE_FULL in case the valid page is full */
return PAGE_FULL;
}