How to read from flash?

RE: How to read from flash?

John — Wed, 11 Jun 2014 14:04:40 GMT

I can suggest a couple of things to try:

Check the error code from your call to sd_flash_write and make sure it is returning NRF_SUCCESS
Make sure the stack has returned a NRF_EVT_FLASH_OPERATION_SUCCESS before reading the memory.
If the S210 stack provides a pstorage API like the S110, use that as it hides all of the nit picky details for you.

RE: How to read from flash?

AndrewM — Tue, 10 Jun 2014 19:01:42 GMT

I've found (using the Keil debugger) that my problem is writing to flash, not reading from.

I'm doing this:

uint32_t pg_size = NRF_FICR->CODEPAGESIZE;
uint32_t pg_num = NRF_FICR->CODESIZE - 1;

uint32_t *addr;
addr = (uint32_t *)(pg_size * pg_num);

sd_flash_write(addr, flashList, 4);

Where flashList is an integer array of stuff I want to write to the flash. Those first few lines come from the flash example.

However, when I check the location in memory pointed at by addr in the debugger, I get all FFs, which is probably why flash read is seeming not work (giving all Fs).

Any ideas?

RE: How to read from flash?

John — Tue, 10 Jun 2014 17:25:36 GMT

The S110 stack provides a pstorage API that uses the sd_flash functions. I took a look at the function used to get data out of flash and it is merely using a memcpy call to get the data out of the program space. I'd guess you can do the same with the S210 stack.