Regarding Flash Read and Write

Question

Hi All,

We are in design phase of our project, which uses two NRF52 chipset one as master and Central , We have some prewritten content in Flash, which need to be read when BLE connection is up. So am currently working on checking how much time it will take to read 256 KB from Flash, Here is my test code for write and read ........ Am using memcpy for read and write in Flash. Is this correct way ?

// flash write

static void flash_write(uint32_t * address, char * 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.
}

	memcpy(address,value,4096);



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.
}

}

// flash read

memcpy(a,addr,1024);

Thanks a Lot in Advance

Susheel Nuguru · Accepted Answer

You are right, you can use memcpy for read operation, but i see that there some small issue in you code below for write operation 
 memcpy(address,value,4096);
while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
{
 // Do nothing.
}
 
 Above is wrong as you need to wait for every word you write to the flash. That is why it takes so much time for flash writes. 
 for (i = 0; i < size; i++)
{
 *address = value;

 // Wait flash write to finish
 while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
 {
 // Do nothing.
 }
}

Regarding Flash Read and Write

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