README.md

Arduino DataFlash library

This is library adds support for the AT45DB SPI flash memory from Adesto Technology (which bought it from Atmel in 2012). At the moment only the D version is supported.

Hardware setup

DataFlash is 5V tolerant but you must power it with 3.3V.

Signal	Arduino pin	Dataflash
MISO	11	1
MOSI	12	8
SCK	13	2
SS	10	4
RESET	user defined	3
WP	user defined	5

Software setup

Copy the following filesto your library or sketch folder.

• DataFlash.cpp
• DataFlash.h
• DataFlashCommands.h
• DataFlashInlines.h
• DataFlashSizes.h

DataFlash_test.cpp is a simple unit test program. It is built upon the arduino-tests library. The /examples/ directory contains some sample sketches.

Please refer to the doxygen documentation for a more detailed API description.

Example

The following example shows how to write and read on a AT45DB161D DataFlash.

#include <SPI.h>
#include "DataFlash.h"

static const int csPin    = 10;
static const int resetPin = 8;
static const int wpPin    = 7;

DataFlash dataflash;

void setup()
{
  uint8_t status;
  DataFlash::ID id;

  const char* dummyMessage = "Hello world";

  SPI.begin();

  dataflash.setup(csPin, resetPin, wpPin);
  dataflash.begin();

  status = dataflash.status();
  dataflash.readID(id);
  // For a brand new AT45DB161D dataflash
  //  status = BIN(00101100)
  //  id.manufacturer       = 0x1F;
  //  id.device[0]          = 0x26;
  //  id.device[1]          = 0x00;
  //  id.extendedInfoLength = 0x00;

  // Write "Hello world" to buffer 1.
  dataflash.bufferWrite(1, 0);
  for(int i=0; dummyMessage[i] != '\0'; i++)
  {
    SPI.transfer(dummyMessage[i]);
  }

  // Transfer buffer 1 to page 7.
  dataflash.bufferToPage(1, 7);

  // Read page 5.
  dataflash.pageRead(5, 0);
  for(int i=0; i<DF_45DB161_PAGESIZE; i++)
  {
    uint8_t data = SPI.transfer(0xff);
  }
}

void loop()
{
  // nothing
}