Able to write only one time in NVMC

[balaji]

Hi ,

Here is my code used to write in to non volatile memory.

#include "nrf.h" //#include "uicr_config.h" #include <stdint.h> #include <stdbool.h> #include "nrf_nvmc.h"

int main(void) {

			uint32_t     address   =  0x10001088;
			uint32_t     value       =  0x13345652;
			uint32_t     b            =   0;
			nrf_nvmc_write_word(address,	value);

			b = *(uint32_t *)address;
			
			//nrf_nvmc_write_word(address+12,	b);
			while (true)
			{
						/* Do nothing */
			}

}

But for first time i able to see the data whatever i have written in memory.

But if i change the value, i cant see the changed data. it remains as old data.

means i am not able to write one more time.

i check by reset the device also , but not able to write.

but if increase address value to 4 more bytes, i am able to write data in new address.

Kindly suggest me, where i am wrong.

Regards Balaji

[balaji]

Hi Ole,

I tried by erasing also but not yet worked.

Here is my code :

#include "nrf.h" //#include "uicr_config.h" #include <stdint.h> #include <stdbool.h> #include "nrf_nvmc.h"

int main(void) {

			uint32_t address = 0x1000108C;
			uint32_t value   = 0x13345653;
			uint32_t b=0;
			
			nrf_nvmc_page_erase(address);
			nrf_nvmc_write_word(address,	value);

			b = *(uint32_t *)address;
			
			//nrf_nvmc_write_word(address+12,	b);
			while (true)
			{
						/* Do nothing */
			}

}

Regards Balaji

[Ole Morten]

You can erase only a full page at a time, as is explained in the nRF51 Reference Manual, and quite clearly shown in the function name, so this code will obviously not work.