Flash Read Issue in NRF52

[Thangaraj]

Hi All,

In Flash read am facing one issue .

Am writing some data to Flash and trying to read back, But when I read back I get some corrupted data or am not able to read in Flash .Am using this code to test flash read timings in Heart rate Sensor example in 11.0.0.2 alpha SDK with NRF52 DK . Here is my code snippet :

**// flash write**

    pg_size = NRF_FICR->CODEPAGESIZE;
    pg_num  = NRF_FICR->CODESIZE - 1;  // Use last page in flash
    addr = (uint32_t *)(pg_size * pg_num);
    printf("Page Size %d\r\n",pg_size);  // it is 4096 
    flash_page_erase(addr);
    printf("before flash write\r\n");
    for(i=0;i<4096;){
			i=i+4;
                        flash_word_write(addr,(uint32_t)'1');
                        ++addr;
    }
    printf("After flash write\r\n");

**// flash read**


   addr = (uint32_t *)(pg_size * pg_num); 

   for(i=0;i<4096;){
 
    addr++;

     printf("flash data:%d %c \r\n",i,*addr);

     i=i+4;

  }

First 32 (i=32) are coming properly but after that some random prints are coming , Am I doing anything wrong ??

I tried memcpy also that to have the same issue ,

[Thangaraj]

Thanks for your quick response ................... !!

static void flash_word_write(uint32_t * address, uint32_t value)
{
    // Turn on flash write enable and wait until the NVMC is ready:
    NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);

    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
        // Do nothing.
    }

    *address = value;

    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
        // Do nothing.
    }

    // Turn off flash write enable and wait until the NVMC is ready:
    NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);

    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
        // Do nothing.
    }
}

static void flash_page_erase(uint32_t * page_address)
{
    // Turn on flash erase enable and wait until the NVMC is ready:
    NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Een << NVMC_CONFIG_WEN_Pos);

    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
        // Do nothing.
    }

    // Erase page:
    NRF_NVMC->ERASEPAGE = (uint32_t)page_address;

    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
        // Do nothing.
    }

    // Turn off flash erase enable and wait until the NVMC is ready:
    NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);

    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
        // Do nothing.
    }
}