Write Data in flash and use same data address in secure bootloader file

RE: Write Data in flash and use same data address in secure bootloader file

Drashti Mistry — Wed, 25 Jan 2023 10:21:58 GMT

Thank you using fstorage example it is working..

RE: Write Data in flash and use same data address in secure bootloader file

Einar Thorsrud — Fri, 13 Jan 2023 13:20:47 GMT

You are not allowed to access the NVCM directly when using the SoftDevice. Instead, you have to use the SotDevice APIs for writing to flash. Either directly (sd_flash_write() / sd_flash_page_erase()) or fstorage, which abstracts away the differences between using a SoftDevice or not.

RE: Write Data in flash and use same data address in secure bootloader file

Drashti Mistry — Fri, 13 Jan 2023 11:25:52 GMT

Thank you for response. I tried same thing and I changed address. Now using 0x00071000 address everythings working fine and stored data from application file and read from bootloader. But I am getting another problem here is when I initialize flash and write the data at the begining of the code from application file(in main using flashwrite example), It is working well but as I said about my application previously, I want to use data comes from BLE So if I am receiving 64 byte data from BLE and after receiving data I am calling this function in main while loop and it is getting stuck at enabling flash write.

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen; <<-- code get stuck here

what is the cause of the problem?

RE: Write Data in flash and use same data address in secure bootloader file

Einar Thorsrud — Tue, 10 Jan 2023 13:10:08 GMT

Hi,

You can read any part of the flash from the bootloader, and that can be as simple as dereferencing a pointer. If for instance you wrote your 64 byte array at 0x00040000, that is where you would read it from. For instance, print the first bye like this:

NRF_LOG_INFO("First byte: 0x%x", *(volatile uint8_t*)0x00040000);

This should be straight-forward.

There is another issue here, though. You write that you are using two pages starting at 0x0007e000, and that will not work with the bootloader. The last two pages are used for MBR params (second to last) and bootloader settings (very last), and cannot be used for anything else. You need to pick a page that is actually unused. See memory layout in the bootloader documentation for details.