How to read from flash?

[AndrewM]

In s210 there are functions sd_flash_page_erase, sd_flash_protect, and sd_flash_write. There is no sd_flash_read.

How do I read from flash? I can write to is using sd_flash_write, but how do I later read this data?

[John]

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.

[AndrewM]

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?

[John]

I can suggest a couple of things to try:

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