cant access flash when bootloader is present

[p_t]

i am trying to use flash to store and read data. I am able to do that when there is only softdevice and application. but when there is bootloader code get stuck. softdevice using is s130 2.0.1. i used keil to generate hex . softdevice and bootloader(buttonless) hex are loaded with nrfgo then app is loaded using nrfconnect(dfu). to give command to flash data given by uart(pin 0.1 and p0.2) . ble_flash.c function i am using to access flash.

NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Een << NVMC_CONFIG_WEN_Pos);

this is line used before erasing the page. i had put two led turn on instructions before and after this line and came to the conclusion that after this line execute code seem stuck somewhere.

cant figure out why?. because without bootloader ,code works.

[Vidar Berg]

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? 

[p_t]

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?

[Vidar Berg]

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

[p_t]

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  

[p_t]

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.

[Vidar Berg]

Hi,

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

[p_t]

(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

[Vidar Berg]

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.