EEPROM Emulation with Arduino API

arduino m0 samd21 robotdyn eeprom flash

Pre-requisites

Blinky Arduino M0

Read and write to the flash memory of a SAMD21 board (E.g. Arduino M0 or RobotDyn SAMD21 M0-Mini) with the EEPROM Arduino API.

The following APIs are used in the example:

EEPROM.isValid()
EEPROM.length()
EEPROM.commit()
EEPROM.write
EEPROM.read

Code

Download code

#include <FlashAsEEPROM.h>

void setup() {
  SerialUSB.begin(115200);
  delay(100);
}

void loop() {
  if (!EEPROM.isValid()) {
    SerialUSB.println("EEPROM is empty, writing some example data:");

    storeInFlash();
    SerialUSB.print("");
  } else {
    SerialUSB.println("EEPROM has been written.");
    SerialUSB.print("Total length of EEPROM is ");
    SerialUSB.println(EEPROM.length());
    SerialUSB.println("Here is the content of the first 20 bytes:");
    SerialUSB.print("->");

    readFromFlash();
    SerialUSB.println("");
  }

  delay(5000);
}

void storeInFlash() {
  for (int i = 0; i < 20; i++) {
    EEPROM.write(i, 100+i);
    SerialUSB.print(" ");
    SerialUSB.print(100+i);
  }

  EEPROM.commit();
}

void readFromFlash() {
  for (int i = 0; i < 20; i++) {
    SerialUSB.print(" ");
    SerialUSB.print(EEPROM.read(i));
  }

  SerialUSB.println();
}

Makefile

BOARD?=arduino:samd:mzero_bl
PORT := $(shell ls /dev/cu.usbmodem*)

.PHONY: default lint all flash clean

default: lint all flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright *.ino

all:
	arduino-cli compile --fqbn $(BOARD) ./

flash:
	arduino-cli upload -p $(PORT) --fqbn $(BOARD) ./

clean:
	rm -f .*.bin
	rm -f .*.elf
	rm -f .*.hex

Serial console

Serial output from the firmware.

EEPROM Emulation with Arduino API

Pre-requisites

Code

Makefile

Serial console

References