EEPROM On The Nano 33 BLE - Arduino Forum

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EEPROM on the Nano 33 BLE ? Official Hardware Nano Family Nano 33 BLE July 11, 2020, 4:38pm 1

Might be a silly question... Is there any EEPROM on the Nano 33 BLE ? If so, how to use it ?

July 11, 2020, 6:10pm 2

There is not, but you can use a part of the flash inside the microcontroller. I searched quite some time as well, resulting in deep diving into the underlying Mbed OS which facilitates a sort of filesystem and has the so-called KvStore. I use it to do some Config file type style settings, and seems to work quite well, at least for what I started with right now.

https://os.mbed.com/docs/mbed-os/v6.1/apis/kvstore.html Examples KvStore usage

My current code (under development);

#include <mbed.h> #include <KVStore.h> #include <kvstore_global_api.h> .... // NVMEM keys and strings static char KvBuf [40]; static char CheckValidStr[] = "55AA"; .... // ***************************************************************************** // NVMEM routines to read/write the configuration to/from non volatile memory // ***************************************************************************** static void nvmemGetConfig() { int16_t res; int16_t i; int32_t templ; size_t  actualSize;   res = kv_get("/kv/check_valid", KvBuf, sizeof(KvBuf), &actualSize);   Serial.println (KvBuf);   if (res != MBED_SUCCESS)   {     // Reset the nvmem storage when not yet initialized     res = kv_reset("/kv/");     Serial.println("KV: Could not get check_valid");     res = kv_set("/kv/check_valid", CheckValidStr, strlen(CheckValidStr), 0);     res = kv_set("/kv/cal_offset", "0", 2, 0);   }   else if (strcmp(KvBuf, CheckValidStr) == 0)   {     Serial.println("KV: store is valid");     res = kv_get("/kv/cal_offset", KvBuf, sizeof(KvBuf), &actualSize);     Hx711SensorOffset = atol(KvBuf);     sprintf(PrintBuf, "Hx711SensorOffset = %d", Hx711SensorOffset);     Serial.println(PrintBuf);   } } July 13, 2020, 11:37am 3

As the frequency of writes that I intend for this non volatile memory is high, I will investigate the possibility to keep RAM On, when in System Off, using the RAMn.POWER control registers.

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