Problem with FMC_NOR Sample Program.

[Rohit Mishra]

Posted on September 04, 2017 at 07:45

I am working on STM32F756-EVAL2 Board, and wanted to use NOR Flash Memory to Store some configuration data. But i am facing some problem. I am not able to write any thing into NOR memory.(But able to perform read Operation).

I also checked with the sample program of FMC_NOR provided for the evaluation board. 

The program provided below Writes a buffer to Nor Flash and then reads it , compares with the written data. Till here the program works fine.

Now in the same example when i perform only read operation to read previously stored data, it is read as blank. 

What could be the issue...... 

int main(void)

{ /* Enable the CPU Cache */ CPU_CACHE_Enable(); HAL_Init();

SystemClock_Config();

/* Configure LED1 and LED3 */ BSP_LED_Init(LED1); BSP_LED_Init(LED3);

/*♯♯-1- Configure the NOR device ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/

/* NOR device configuration */

hnor.Instance = FMC_NORSRAM_DEVICE;

hnor.Extended = FMC_NORSRAM_EXTENDED_DEVICE;

NOR_Timing.AddressSetupTime = 4;

NOR_Timing.AddressHoldTime = 3; NOR_Timing.DataSetupTime = 8; NOR_Timing.BusTurnAroundDuration = 1; NOR_Timing.CLKDivision = 2; NOR_Timing.DataLatency = 2; NOR_Timing.AccessMode = FMC_ACCESS_MODE_A; hnor.Init.NSBank = FMC_NORSRAM_BANK1; hnor.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_DISABLE; hnor.Init.MemoryType = FMC_MEMORY_TYPE_NOR; hnor.Init.MemoryDataWidth = NOR_MEMORY_WIDTH; hnor.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE; hnor.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW; hnor.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS; hnor.Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE; hnor.Init.WaitSignal = FMC_WAIT_SIGNAL_ENABLE; hnor.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE; hnor.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_ENABLE; hnor.Init.WriteBurst = FMC_WRITE_BURST_DISABLE; hnor.Init.ContinuousClock = NOR_CONTINUOUS_CLOCK;

/* Initialize the NOR controller */

if(HAL_NOR_Init(&hnor, &NOR_Timing, &NOR_Timing) != HAL_OK) {    /* Initialization Error */    Error_Handler(); }

// /*♯♯-2- NOR memory read/write access ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/

// /* Fill the buffer to write */// Fill_Buffer(aTxBuffer, BUFFER_SIZE, 0xD20F);//// /* Write data to the NOR memory */// for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)// {// /* Write data to NOR */// HAL_NOR_Program(&hnor, (uint32_t *)(NOR_BANK_ADDR + WRITE_READ_ADDR + 2*uwIndex), &aTxBuffer[uwIndex]);//// /* Read NOR device status */// if(HAL_NOR_GetStatus(&hnor, NOR_BANK_ADDR, PROGRAM_TIMEOUT) != HAL_NOR_STATUS_SUCCESS)// {// return HAL_NOR_STATUS_ERROR;// }// }

/* Read back data from the NOR memory */

if(HAL_NOR_ReadBuffer(&hnor, NOR_BANK_ADDR + WRITE_READ_ADDR, &aRxBuffer[0], BUFFER_SIZE) != HAL_OK) { return HAL_ERROR; }

/*♯♯-3- Checking data integrity ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/

uwWriteReadStatus = Buffercmp(aTxBuffer, aRxBuffer, BUFFER_SIZE); if (uwWriteReadStatus != PASSED) { /* KO */ /* Toggle LED3 */ while(1) { BSP_LED_Toggle(LED3); } } else { /* OK */ /* Turn on LED1 */ BSP_LED_On(LED1); }

   /* Infinite loop */

   while (1)    {    }}#flash-writing