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Feather Huzza! ESP8266 & 25AA010A EEPROM
/*
SPI Master Demo Sketch
Connect the SPI Master device to the following pins on the esp8266:
GPIO NodeMCU Name | Uno
===================================
15 D8 SS | D10
13 D7 MOSI | D11
12 D6 MISO | D12
14 D5 SCK | D13
Note: If the ESP is booting at a moment when the SPI Master has the Select line HIGH (deselected)
the ESP8266 WILL FAIL to boot!
See SPISlave_SafeMaster example for possible workaround
*/
#include <SPI.h>
#define normal
#ifdef normal
#define EE_READ 0b00000011//3
#define EE_WRITE 0b00000010//2
#define EE_WRDI 0b00000100//4
#define EE_WREN 0b00000110//6
#define EE_RDSR 0b00000101//5
#define EE_WRSR 0b00000001//1
#else
#define EE_READ 0b11000000
#define EE_WRITE 0b01000000
#define EE_WRDI 0b00100000
#define EE_WREN 0b01100000
#define EE_RDSR 0b10100000
#define EE_WRSR 0b10000000
#endif
class ESPMaster {
private:
uint8_t _ss_pin;
uint8_t _wp_pin;
public:
ESPMaster(uint8_t ss_pin, uint8_t wp_pin)
{
_ss_pin = ss_pin;
_wp_pin = wp_pin;
}
void begin() {
pinMode(_ss_pin, OUTPUT);
pinMode(_wp_pin, OUTPUT);
digitalWrite(_ss_pin, HIGH);
digitalWrite(_wp_pin, LOW);
SPI.setDataMode(0); //CPOL=0; CPHA=0; -> mode=0
SPI.setClockDivider(SPI_CLOCK_DIV4);
}
uint8_t readStatus()
{
digitalWrite(_ss_pin, LOW);
delay(1);
SPI.transfer(EE_RDSR);
uint8_t status = SPI.transfer(0);
digitalWrite(_ss_pin, HIGH);
return status;
}
void writeEnable()
{
digitalWrite(_ss_pin, LOW);
delay(1);
SPI.transfer(EE_WREN);
digitalWrite(_ss_pin, HIGH);
}
void writeDisable()
{
digitalWrite(_ss_pin, LOW);
SPI.transfer(EE_WRDI);
digitalWrite(_ss_pin, HIGH);
}
void writeStatus(uint8_t status) {
writeEnable();
digitalWrite(_wp_pin, HIGH);
digitalWrite(_ss_pin, LOW);
SPI.transfer(EE_WRSR);
SPI.transfer(status & 0x0F);
digitalWrite(_wp_pin, LOW);
digitalWrite(_ss_pin, HIGH);
}
void readData(uint8_t address, uint8_t *data, uint8_t length)
{
digitalWrite(_ss_pin, LOW);
SPI.transfer(EE_READ);
SPI.transfer(address);
for (uint8_t i = 0; i < length; i++) {
data[i] = SPI.transfer(0);
}
digitalWrite(_ss_pin, HIGH);
}
bool checkWriteEnable()
{
uint8_t status = readStatus();
if( status & 0b010 == 0b010) //Write Enable Latch is set
{
return true;
}
else
{
writeEnable();
return false;
}
}
bool writeData(uint8_t address, uint8_t data)
{
digitalWrite(_wp_pin, HIGH);
checkWriteEnable();
digitalWrite(_ss_pin, LOW);
SPI.transfer(EE_WRITE);
SPI.transfer(address & 0x7F);
SPI.transfer(data & 0xFF);
digitalWrite(_ss_pin, HIGH);
//data is written
uint8_t statuss = 1;
while(statuss & 0b001 == 0b001) //write in progress
{
statuss = readStatus();
yield();
}
digitalWrite(_wp_pin, LOW);
uint8_t check = 0;
readData(address, &check, 1);
return check == data;
}
};
#define SS 0
#define WP 4
ESPMaster esp(SS, WP);
SPISettings spidefault(4000000, MSBFIRST, SPI_MODE0);
void setup() {
Serial.begin(74880);
SPI.setDataMode(SPI_MODE0); //CPOL=0; CPHA=0; -> mode=0
SPI.setClockDivider(SPI_CLOCK_DIV128);
SPI.setBitOrder(MSBFIRST);
SPI.begin();
esp.begin();
delay(1000);
Serial.println("Started");
Serial.print("Satus ");
SPI.beginTransaction(spidefault);
digitalWrite(SS, LOW);
delay(1000);
uint8_t status;
status = SPI.transfer(EE_RDSR);
Serial.print(status);
Serial.print(" ");
status = SPI.transfer(0);
delay(500);
digitalWrite(SS, HIGH);
SPI.endTransaction();
Serial.println(status);
}
int i = 0;
uint8_t j = 0;
uint8_t sendLoggedBase(uint8_t t)
{
Serial.print("Send ");
Serial.print(t);
Serial.print(" got ");
SPI.transfer(t);
uint8_t got = SPI.transfer(0);
Serial.print(got);
Serial.println();
return got;
}
uint8_t sendLogged(uint8_t t)
{
digitalWrite(SS, LOW);
delay(1);
uint8_t got = sendLoggedBase(t);
digitalWrite(SS, HIGH);
delay(1);
return got;
}
void loop()
{
sendLogged(5);//read status
uint8_t data[33];
data[32] = 0;
esp.readData(0, data, 32);
Serial.println((char*)data);
i++;
j++;
if(j>=32)
j=0;
Serial.print("W: ");
Serial.print(j);
Serial.print("->");
Serial.print(i);
if(esp.writeData(j, i))
Serial.println(" Done");
else
Serial.println(" Fail");
delay(1000);
}
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