External Nor Flash Programming from Application

NOR vendors typical provide algorithmic and unlocking information for their specific devices. This code is normally available as C routines, or pseudo code, in a non-architecture specific form, ie not tied to the STM32F4. Programming examples for the device should be sought from the vendor of the flash part.

One of the things which might help is to spell the device's name correctly.

Hi,

I am trying to access External NOR Flash from STM32F439Nih6microcontroller..i am using M29W128GL NOR Flash Device

Below is my NOR Flash initialization function

void MX_FMC_Init(void)

{

  FMC_NORSRAM_TimingTypeDef Timing;

  FMC_SDRAM_TimingTypeDef SdramTiming;

  /** Perform the NOR1 memoryinitialization sequence

  */

  hnor1.Instance = FMC_NORSRAM_DEVICE;

  hnor1.Extended =FMC_NORSRAM_EXTENDED_DEVICE;

  /* hnor1.Init */

  hnor1.Init.NSBank =FMC_NORSRAM_BANK1;

  hnor1.Init.DataAddressMux =FMC_DATA_ADDRESS_MUX_DISABLE;

  hnor1.Init.MemoryType =FMC_MEMORY_TYPE_NOR;

  hnor1.Init.MemoryDataWidth =FMC_NORSRAM_MEM_BUS_WIDTH_16;

  hnor1.Init.BurstAccessMode =FMC_BURST_ACCESS_MODE_DISABLE;

  hnor1.Init.WaitSignalPolarity =FMC_WAIT_SIGNAL_POLARITY_LOW;

  hnor1.Init.WrapMode =FMC_WRAP_MODE_DISABLE;

  hnor1.Init.WaitSignalActive =FMC_WAIT_TIMING_BEFORE_WS;

  hnor1.Init.WriteOperation =FMC_WRITE_OPERATION_ENABLE;

  hnor1.Init.WaitSignal =FMC_WAIT_SIGNAL_ENABLE;

  hnor1.Init.ExtendedMode =FMC_EXTENDED_MODE_DISABLE;

  hnor1.Init.AsynchronousWait =FMC_ASYNCHRONOUS_WAIT_ENABLE;

  hnor1.Init.WriteBurst =FMC_WRITE_BURST_DISABLE;

  hnor1.Init.ContinuousClock=FMC_CONTINUOUS_CLOCK_SYNC_ONLY;// FMC_CONTINUOUS_CLOCK_SYNC_ASYNC;

  /* Timing */

  Timing.AddressSetupTime = 4;

  Timing.AddressHoldTime = 3;

  Timing.DataSetupTime = 7;

  Timing.BusTurnAroundDuration = 1;

  Timing.CLKDivision = 2;

  Timing.DataLatency = 2;

  Timing.AccessMode =FMC_ACCESS_MODE_A;

  /* ExtTiming */

}

The erasingof NOR flash chip is done by the following API’s

/****************************erase norstart****************************************************/

/*##-3- Erase NOR memory

 ###################################################*/

/* Return to read mode */

HAL_NOR_ReturnToReadMode(&hnor1);

/* Send NOR erase block operation */

HAL_NOR_Erase_Block(&hnor1,WRITE_READ_ADDR,NORSRAM_BANK_ADDR);

/* Return the NOR memory status */

if(HAL_NOR_GetStatus(&hnor1,NORSRAM_BANK_ADDR,BLOCKERASE_TIMEOUT) !=NOR_SUCCESS)

{

return NOR_ERROR;}

printf(''sln-1\n\r'');

//****************************erase NORstop****************************************************/                                                                               

//****************************write to NOR addresssstart******************************************/

Fill_Buffer_constant_data_read_write(aTxBuffernor,BUFFER_SIZE_NOR,0xAAAA);// fill the buffer                                                                                                                                                                                                                                                                                                                                                                                               

/* Write data to the NOR memory */

HAL_NOR_Program(&hnor1, (uint32_t*)norsram1address, aTxBuffernor,BUFFER_SIZE_NOR);                                                                                                                                                                                                                                                                                                                                                                                                                                            

/****************************Read to NOR addresss start******************************************************************/

HAL_NOR_Read(&hnor1, (uint32_t*)norsram1address,aRxBuffernor,BUFFER_SIZE_NOR);/* Read back data from the SDRAM memory */

/********************************************************************************************************************/

When i try to Access NOR Flash i.e, write/Read operation, After performingwrite and read ,when i compare TxBuffer and RxBuffer in RxBuffer  i am getting junk data 0xFFFF.

Kindly look at the code and suggest the way to get the output

Regards

AMAR TR     

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