C implementation for writing to NVMC

RE: C implementation for writing to NVMC

micallef25 — Sun, 30 Apr 2017 00:56:10 GMT

hello daniel the (uint32_t)address = value; is what I was pretty much looking for. Than kyo for your help

RE: C implementation for writing to NVMC

Daniel Wang — Sun, 30 Apr 2017 00:47:31 GMT

The nrf_nvmc_write_word() function looks like this:

void nrf_nvmc_write_word(uint32_t address, uint32_t value)
{
    // Enable write.
    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
    }

    *(uint32_t*)address = value;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
    }

    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
    }
}

So now you can implement this in your own function ; )

RE: C implementation for writing to NVMC

micallef25 — Sun, 30 Apr 2017 00:31:00 GMT

Hi Rols, Thanks for the reply. I did see that but my question was more of the actual C implementation ie. *Flash_Address = Data_To_Write; I believe this should work so I guess this question can be closed.

RE: C implementation for writing to NVMC

RK — Sun, 30 Apr 2017 00:25:44 GMT

Straight out of the manual

The Non-volatile memory controller (NVMC) is used for writing and erasing the internal Flash memory and the UICR.

Before a write can be performed, the NVMC must be enabled for writing in CONFIG.WEN. Similarly, before an erase can be performed, the NVMC must be enabled for erasing in CONFIG.EEN, see CONFIG. The user must make sure that writing and erasing are not enabled at the same time. Failing to do so may result in unpredictable behavior.

Writing to Flash

When writing is enabled, the Flash is written by writing a full 32-bit word to a word-aligned address in the Flash.

RE: C implementation for writing to NVMC

micallef25 — Sun, 30 Apr 2017 00:10:36 GMT

Hi Daniel, I did not really want to use their drivers I wanted to make my own.

RE: C implementation for writing to NVMC

Daniel Wang — Sun, 30 Apr 2017 00:03:50 GMT

Use the driver for the NVMC that is in the SDK. You have 4 different functions for writing to NVMC. Here is a link to the infocenter page