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
}