cant access flash when bootloader is present

RE: cant access flash when bootloader is present

Vidar Berg — Mon, 17 Jun 2019 12:07:42 GMT

It's ok to use the sd flash API directly. Although I prefer using fstorage/fds modules on top of the SD flash API when I have flash data needs to be updated frequently.

RE: cant access flash when bootloader is present

p_t — Thu, 13 Jun 2019 12:53:38 GMT

it works with bootloader also ...

i am now doing sd_flash_write while i am connected via NUS service...its woking now...but do you suggest to do this way?

RE: cant access flash when bootloader is present

p_t — Thu, 13 Jun 2019 10:30:14 GMT

ok ...so in the sd_flash write it was memory address instead of page number.

err_code = sd_flash_write((uint32_t *)((NRF_FICR->CODESIZE - 20)*NRF_FICR->CODEPAGESIZE),data_32_1,2);

with this i get , err_code = NRF_SUCCESS and NRF_EVT_FLASH_OPERATION_SUCCESS in sys_evt_dispatch

with pointers ..able to read data direclty from address...

RE: cant access flash when bootloader is present

p_t — Thu, 13 Jun 2019 08:35:57 GMT

added this in ble_stack_init

err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
APP_ERROR_CHECK(err_code);

then,

static void sys_evt_dispatch(uint32_t sys_evt)
{
if(sys_evt == NRF_EVT_FLASH_OPERATION_SUCCESS)
{
printf("\r\nerased\r\n");
}
else if(sys_evt == NRF_EVT_FLASH_OPERATION_ERROR)
{
printf("\r\nerror\r\n");
}

}

when erase execute,

err_code_ = sd_flash_page_erase(NRF_FICR->CODESIZE - 20);

i get,

err_code = NRF_SUCCESS and event of NRF_EVT_FLASH_OPERATION_SUCCESS

but at

err_code = sd_flash_write((uint32_t *)(NRF_FICR->CODESIZE) - 20,data_32_1,2);

i get,

err_code = NRF_ERROR_FORBIDDEN and no event in sys_evt_dispatch

why i get forbidden error while writing and not in erase?

for source i am using

uint32_t const data_32_1[6] = {'@','@','@','@','@','@'};

RE: cant access flash when bootloader is present

Vidar Berg — Wed, 12 Jun 2019 09:04:43 GMT

The events may get consumed by the Softdevice Handler before being read in your main loop. You should register a callback for SoC events at the end of ble_stack_init instead.

/**@brief Function for dispatching a system event to interested modules.
 *
 * @details This function is called from the System event interrupt handler after a system
 *          event has been received.
 *
 * @param[in] sys_evt  System stack event.
 */
static void sys_evt_dispatch(uint32_t sys_evt)
{
    //TODO: check sys_evt
}

/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ...

    // Register with the SoftDevice handler module for SoC events.
    err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}

RE: cant access flash when bootloader is present

p_t — Mon, 10 Jun 2019 06:24:38 GMT

old thread was made when i was was working on non-connectible application and new thread is which i am working on now, its connectible NUS ble service . I will make you the example to test.

sd_flash_page_erase() generate event which should be processed by sd_evt_get().

so add that code suggested here,

https://devzone.nordicsemi.com/f/nordic-q-a/48074/sd_flash_page_erase-error-code-success-but-flash-erase-fail/190421#190421

err_code_ = sd_flash_page_erase(erase_page);

while (1)
{
sd_evt_get (&evt);
if (evt == NRF_EVT_FLASH_OPERATION_SUCCESS || evt == NRF_EVT_FLASH_OPERATION_ERROR)
break;
}

i never get the event ,

RE: cant access flash when bootloader is present

Vidar Berg — Tue, 04 Jun 2019 15:33:54 GMT

I see that you made a new thread: https://devzone.nordicsemi.com/f/nordic-q-a/48051/cant-access-flash-memory-after-ota. Lets continue the discussion there.

RE: cant access flash when bootloader is present

p_t — Tue, 04 Jun 2019 06:01:47 GMT

(NRF_UICR->BOOTLOADERADDR/NRF_FICR->CODEPAGESIZE) - 2

This page i am trying to erase....

I read in bootloader about application reserve data too which data doesnt get erased while ble dfu.

I have set it to this,

#define DFU_APP_DATA_RESERVED CODE_PAGE_SIZE * 100

RE: cant access flash when bootloader is present

Vidar Berg — Mon, 03 Jun 2019 14:15:01 GMT

Hi,

What are the page numbers you pass to sd_flash_page_erase()?

RE: cant access flash when bootloader is present

p_t — Sat, 01 Jun 2019 08:21:57 GMT

i made sure that i am not erasing bootloader page or any application pages. i don't think that the issue is of the softdevice. I believe that flash access issue is somehow because of bootloader code.

RE: cant access flash when bootloader is present

p_t — Wed, 12 Dec 2018 11:32:04 GMT

i tried both functions...

sd_flash_page_erase return NRF_SUCCESS and sd_flash_write return NRF_BUSY

code doesnt hang up.

but after performing erase ,cant load app.zip from nrfconnect...

page i am erasing is NRF_FICR->CODESIZE - 20

am i erasing my bootloader page?

Program Size: Code=29700 RO-data=520 RW-data=452 ZI-data=10988

RE: cant access flash when bootloader is present

Vidar Berg — Wed, 12 Dec 2018 09:30:16 GMT

Yes, you can use the softdevice flash API (sd_flash_page_erase and sd_flash_write)

RE: cant access flash when bootloader is present

p_t — Wed, 12 Dec 2018 09:24:16 GMT

i am performing flash access after enabling softdevice. i have read that direct flash access is resticted when softdevice is active.but is there any way to do that then.. should i have to disable softdevice before performing flash access?

RE: cant access flash when bootloader is present

Vidar Berg — Wed, 12 Dec 2018 09:13:09 GMT

Are you performing the flash operations before you enable the softdevice? Note that it is not possible to access NVMC directly when the softdevice is enabled. Also, what flash pages are you erasing?

RE: cant access flash when bootloader is present

Vidar Berg — Wed, 12 Dec 2018 09:12:55 GMT

Are you performing the flash operations before you enable the softdevice? Note that it is not possible to access NVMC directly when the softdevice is enabled. Also, what flash pages are you erasing?