SPI Flash Test

spiflashtest.ino

#include <SPIFlash.h>

#define BAUD_RATE 9600
#define WP 8
#define HOLD 9
#define LED 2

SPIFlash flash;
uint16_t page = 1;
uint8_t offset = 5;
uint8_t dataByte = 0;

int sensorValue = 0;

void setup() {
  pinMode(LED, OUTPUT);
  digitalWrite(LED, HIGH);
  delay(10);
  Serial.begin(BAUD_RATE);
  Serial.print(F("Initialising Flash memory..."));
  flash.begin();
  Serial.println(flash.getJEDECID(), HEX);
  digitalWrite(LED, LOW);
}

void loop() {
  digitalWrite(LED, HIGH);
  sensorValue = byte(analogRead(A0));
  Serial.print(F("Random value: "));
  Serial.println(sensorValue, HEX);
  
  Serial.print(F("write..."));
  flash.eraseSector(page, 0); //<-- Does not work without this line (WTF?)
  flash.writeByte(page, offset, byte(sensorValue));
  Serial.println(flash.error(), HEX);

  delay(100);
  
  Serial.print(F("read..."));
  dataByte = flash.readByte(page, offset);
  Serial.println(dataByte, HEX);
  digitalWrite(LED, LOW);
  delay(1000);
}