eprom implementation in nrf5

RE: eprom implementation in nrf5

Susheel Nuguru — Tue, 18 Apr 2017 10:56:19 GMT

You do not need any API to read flash memory. You can just read it directly like below which will read 4 bytes from given memory location.

#define flash_memory_address  0xsomething

uint32_t value = *(uint32_t *)flash_memory_address ;

RE: eprom implementation in nrf5

Waqar Ahmed — Tue, 18 Apr 2017 10:30:55 GMT

i have run thr flashwrite example from sdk 12.1

RE: eprom implementation in nrf5

Susheel Nuguru — Tue, 18 Apr 2017 10:23:32 GMT

which API did you use to write?

RE: eprom implementation in nrf5

Waqar Ahmed — Tue, 18 Apr 2017 10:21:16 GMT

i have run the compile example flash write .and write a character on flash memory.now i want to read this value from flash .is u can help how i did this

RE: eprom implementation in nrf5

Susheel Nuguru — Tue, 18 Apr 2017 09:50:50 GMT

What endnode said is correct. nRF chips do not have in built EEPROM. That said, they can be simulated and we have an example that does this simulation on RAM. You can find this at SDK\examples\peripheral\twi_master_with_twis_slave\eeprom_simulator.h file.

This example was designed to simulate EEPROM on Nordic chip for booting the code. That is it assigns configurable part of flash as EEPROM and loads the code from it to RAM and runs it. The interface with simulated EEPROM is TWI and you can later decide to switch from/to simulated EEPROM to external EEPROM without changing the code. The header file is quite simple and see the main.c to see how it works. If you have questions you can ask here.

RE: eprom implementation in nrf5

endnode — Tue, 18 Apr 2017 07:42:47 GMT

There is no EEPROM on nRF5x chips, it's flash technology. It has several specifics like it must be erased in pages before writing to it (that can be done per 32-bit words), erasing takes pretty long time etc. There are resources on Infocenter about it.