Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

RE: Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

tany0699 — Wed, 03 Jun 2015 07:07:04 GMT

Thank you for your reply, Aryan.Your are right and with your help, I had solved my problem,thank you very much.

RE: Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

Susheel Nuguru — Wed, 03 Jun 2015 05:34:20 GMT

12th Page is where the information of softdevice is located, like its size and other firmware info. When you delete that information, then nRFgo thinks that there is no softdevice. Even read and save as hex file need 12th page. You can for example try to delete 13 or 14th page and at that time nRFgo can still read this critical information about softdevice from 12th Page

RE: Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

tany0699 — Wed, 03 Jun 2015 02:15:24 GMT

You are right.When I use the commands of nrfjprog.exe like you,I get the some result like you.But if I use "nRFgo Studio",it can't read anything at SoftDevice region when I erase the 12th page.You can have a try.thank you for your reply.

RE: Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

Susheel Nuguru — Tue, 02 Jun 2015 11:03:02 GMT

i used nrfjprog to erase 12th page and it worked fine. Deleted just 12th page and did not delete anything else. I am attaching snapshot in my answer.

RE: Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

tany0699 — Mon, 01 Jun 2015 13:08:51 GMT

I use the tool "nrfjprog.exe" to erase 12th page(start at 0x3000),and I use the MBR API :

static uint32_t dfu_copy_sd( uint32_t * src, uint32_t * dst, uint32_t len)

{

sd_mbr_command_t sd_mbr_cmd;

sd_mbr_cmd.command            = SD_MBR_COMMAND_COPY_SD;
sd_mbr_cmd.params.copy_sd.src = src;
sd_mbr_cmd.params.copy_sd.dst = dst;
sd_mbr_cmd.params.copy_sd.len = len / sizeof(uint32_t);

return sd_mbr_command(&sd_mbr_cmd);

}

to write 1kB data into 12th page(start at 0x3000), all this two ways the MBR is erased,why?

RE: Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

tany0699 — Mon, 01 Jun 2015 12:51:22 GMT

I use the tool "nrfjprog.exe" to erase 12th page(start at 0x3000),and I use the MBR API : static uint32_t dfu_copy_sd(uint32_t * src, uint32_t * dst, uint32_t len) { sd_mbr_command_t sd_mbr_cmd;

sd_mbr_cmd.command            = SD_MBR_COMMAND_COPY_SD;
sd_mbr_cmd.params.copy_sd.src = src;
sd_mbr_cmd.params.copy_sd.dst = dst;
sd_mbr_cmd.params.copy_sd.len = len / sizeof(uint32_t);

return sd_mbr_command(&sd_mbr_cmd);

} to write 1kB data into 12th page(start at 0x3000), all this two ways the MBR is erased,why?

RE: Why MBR is erased when I erase or write the SorfDevice with 1kB at address 0x3000?

Susheel Nuguru — Mon, 01 Jun 2015 12:33:17 GMT

how are you erasing or writing to the softdevice?

update:

nrfjprog works normally