No estoy completamente seguro de esto, sin una hoja de datos o un manual para el escudo no hay forma de estar seguro. (aparte de probarlo)
Parece que usa SPI flash, lo que significa que usa el protocolo SPI para transferir datos.
Primero, únase a los pines MISO / MOSI / SCK en los dos dispositivos. También conecte el pin 10 de Arduino al ChipSelect del dispositivo. (Es muy posible que estos pines ya estén conectados, al menos el sitio de LinkSprite parece decirlo)
La transferencia de datos para ser almacenados / leídos desde la memoria externa a través de SPI se explica bastante bien aquí . Copiaré el código final:
Tenga en cuenta que el código es para un chip EEPROM, pero también debería funcionar aquí.
#define DATAOUT 11//MOSI
#define DATAIN 12//MISO
#define SPICLOCK 13//sck
#define SLAVESELECT 10//ss
//opcodes
#define WREN 6
#define WRDI 4
#define RDSR 5
#define WRSR 1
#define READ 3
#define WRITE 2
byte eeprom_output_data;
byte eeprom_input_data=0;
byte clr;
int address=0;
//data buffer
char buffer [128];
void fill_buffer()
{
for (int I=0;I<128;I++)
{
buffer[I]=I;
}
}
char spi_transfer(volatile char data)
{
SPDR = data; // Start the transmission
while (!(SPSR & (1<<SPIF))) // Wait the end of the transmission
{
};
return SPDR; // return the received byte
}
void setup()
{
Serial.begin(9600);
pinMode(DATAOUT, OUTPUT);
pinMode(DATAIN, INPUT);
pinMode(SPICLOCK,OUTPUT);
pinMode(SLAVESELECT,OUTPUT);
digitalWrite(SLAVESELECT,HIGH); //disable device
// SPCR = 01010000
//interrupt disabled,spi enabled,msb 1st,master,clk low when idle,
//sample on leading edge of clk,system clock/4 rate (fastest)
SPCR = (1<<SPE)|(1<<MSTR);
clr=SPSR;
clr=SPDR;
delay(10);
//fill buffer with data
fill_buffer();
//fill eeprom w/ buffer
digitalWrite(SLAVESELECT,LOW);
spi_transfer(WREN); //write enable
digitalWrite(SLAVESELECT,HIGH);
delay(10);
digitalWrite(SLAVESELECT,LOW);
spi_transfer(WRITE); //write instruction
address=0;
spi_transfer((char)(address>>8)); //send MSByte address first
spi_transfer((char)(address)); //send LSByte address
//write 128 bytes
for (int I=0;I<128;I++)
{
spi_transfer(buffer[I]); //write data byte
}
digitalWrite(SLAVESELECT,HIGH); //release chip
//wait for eeprom to finish writing
delay(3000);
Serial.print('h',BYTE);
Serial.print('i',BYTE);
Serial.print('\n',BYTE);//debug
delay(1000);
}
byte read_eeprom(int EEPROM_address)
{
//READ EEPROM
int data;
digitalWrite(SLAVESELECT,LOW);
spi_transfer(READ); //transmit read opcode
spi_transfer((char)(EEPROM_address>>8)); //send MSByte address first
spi_transfer((char)(EEPROM_address)); //send LSByte address
data = spi_transfer(0xFF); //get data byte
digitalWrite(SLAVESELECT,HIGH); //release chip, signal end transfer
return data;
}
void loop()
{
eeprom_output_data = read_eeprom(address);
Serial.print(eeprom_output_data,DEC);
Serial.print('\n',BYTE);
address++;
if (address == 128)
address = 0;
delay(500); //pause for readability
}
Este código debería también funciona para el escudo Copperhead. Si no, hay este código para SPI flash (de aquí ):
#include <SPI.h>
#include <Peggy2.h>
#define SS_PIN 16
Peggy2 frame1;
byte toDisp = 0;
byte checker = 0;
void setup()
{
frame1.HardwareInit();
pinMode(SS_PIN,OUTPUT); //set pin16 to output, SS pin
SPI.setClockDivider(SPI_CLOCK_DIV2); //set the SPI clock to f/2, fastest possible
SPI.begin(); //SPI lib function which sets ddr for SCK and MOSI pin
//MISO is auto input
//see SPI.cpp for more info
}
void loop()
{
if(!checker){
enableProgramming();
programData();
toDisp = receiveByte(0);
checker = 1;
frame1.WriteRow(0,toDisp);
}
frame1.RefreshAll(2);
}
byte receiveByte(unsigned long startAddress)
{
//Begin High Speed Read Instruction
//See p. 10 of SST data sheet
digitalWrite(SS_PIN,LOW);
SPI.transfer(0x0B); //high speed read instruction
SPI.transfer(0x00); //next 3 transfers are address bits A32 - A0
SPI.transfer(0x00); //So this will read the first byte on the chip
SPI.transfer(0x00); //last address bits
SPI.transfer(0xFF); //dummy byte is required to start sending data back to uP
SPI.transfer(0xFF); //I'm hoping that if I transfer a bullshit byte, the flash
//chip will transfer it's data to me in the same time
digitalWrite(SS_PIN,HIGH);
//End High Speed Read Instruction
return SPDR;
}
//will perform the read instruction starting from
//startAddress and will receive numOfBytes bytes in
//succession
void receiveBytes(int numOfBytes, unsigned long startAddress)
{
digitalWrite(SS_PIN,LOW);
SPI.transfer(0x0B);//high speed read instruction
}
//will perform:
// 1) Chip Erase
// and loop through:
// 1) Page Program
// 2) increment Page
//until the data has finished **note this can loop and over write beginning of memory
void programData(){
//Begin ChipErase Instruction
//See p. 17 of SST data sheet
digitalWrite(SS_PIN,LOW);
SPI.transfer(0x60);//chip erase instruction
digitalWrite(SS_PIN,HIGH);
delay(50);//spec'd time for CE to finish
//don't bother polling because time to program is irrelevant
//End ChipErase Instruction
//Begin WREN Instruction
//See p. 18 of SST data sheet
digitalWrite(SS_PIN,LOW);
SPI.transfer(0x06);//write enable instruction
digitalWrite(SS_PIN,HIGH);
//End WREN Instruction
digitalWrite(SS_PIN,LOW);
SPI.transfer(0x02); //page program instruction
SPI.transfer(0x00); //first 8 address bits
SPI.transfer(0x00); //2nd 8 address bits
SPI.transfer(0x00); //3rd 8 address bits
SPI.transfer(0xAA); //10101010 is the byte I should be writing
digitalWrite(SS_PIN,HIGH);
delayMicroseconds(3000); //wait 3 ms for page program
/*
//Begin Page-Program Instruction
//see p. 13 of SST data sheet
byte firstAddress = 0;
byte secondAddress = 0;
//this loop will write to every byte in the chips memory
//32,768 pages of 256 bytes = 8,388,608 bytes
for(unsigned int i = 0; i < 32,768; ++i) //long variable is number of pages
{
digitalWrite(SS_PIN,LOW);
++secondAddress; //cycles from 0 to 255, counts pages
firstAddress = i>>8; // floor(i/256)
SPI.transfer(0x02);//Page-Program instruction byte
SPI.transfer(firstAddress); //increments every 256 pages i.e. at page 256 this should be 1
SPI.transfer(secondAddress); //increments every 256 bytes, i.e every page
SPI.transfer(0x00); //beginning of a page boundary
for(int j = 0; j < 256; ++j) //number of bytes per page
{
SPI.transfer(2program[(256*i) + j]);//data byte transfer
}
digitalWrite(SS_PIN,HIGH);
delayMicroseconds(2500); //2500us (2.5ms) delay for each page-program instruction to execute
}
//End Page-Program Instruction
*/
}
//Will prepare the chip for writing by performing:
// 1) arm the status register
// 2) Write Enable instruction
//Only needs to be performed once!
void enableProgramming(){
//Begin EWSR & WRSR Instructions
//See p. 20 of SST data sheet for more info
digitalWrite(SS_PIN,LOW); //lower the SS pin
SPI.transfer(0x50); //enable write status register instruction
digitalWrite(SS_PIN,HIGH); //raise the SS pin
delay(10);
digitalWrite(SS_PIN,LOW); //lower the SS pin
SPI.transfer(0x01); //write the status register instruction
SPI.transfer(0x00);//value to write to register
//xx0000xx will remove all block protection
digitalWrite(SS_PIN,HIGH);
//End EWSR & WRSR Instructions
//Begin WREN Instruction
//See p. 18 of SST data sheet
digitalWrite(SS_PIN,LOW);
SPI.transfer(0x06);//write enable instruction
digitalWrite(SS_PIN,HIGH);
//End WREN Instruction
}