[[solved]]Connection Arduino UNO + Gameduino 2 + RFID-MC522

[hiram]

Hello everyone,

I try to connect Gameduino 2 with and the reader RFID-RC522 to Arduino UNO, i use the library MFRC522,

My code is...

#include <SPI.h>
#include <MFRC522.h>
#include <EEPROM.h>
#include <GD2.h>

#define RST_PIN 7 //
#define SS_PIN 6 //
#define GPU_PIN 8 // Gameduino GPU

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance

void setup() {

Serial.begin(9600); // Initialize serial communications with the PC

SPI.begin(); // Init SPI bus
pinMode(SS_PIN, OUTPUT); // off SS_PIN reader
digitalWrite(SS_PIN, HIGH);
pinMode(GPU_PIN, OUTPUT); // on GPU_PIN GD
digitalWrite(GPU_PIN, LOW);

// Initialize GD2
GD.begin(0);
GD.__end();

// Initialize Reader
Serial.println("Init Reader");
mfrc522.PCD_Init(); // Init MFRC522

GD.resume();
}

void loop(){

GD.ClearColorRGB(0x103000);
GD.Clear();
GD.cmd_text(240, 136, 31, OPT_CENTER, "Test");
GD.swap();
GD.__end();

// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}

// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}

// Dump debug info about the card; PICC_HaltA() is automatically called
mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
GD.resume();
}

With this code can reading the card and dump info into Serial, but the screen don't showing nothing, please help me to connect this devices at the same time.

You can find the code in this link.

Regards from México.

[jamesbowman]

This code looks totally fine. So this is puzzling.

Couple of suggestions:

(1) call "GD.finish()" after "GD.swap()"

(2) make sure there is no microSD card in the slot. It may be interfering with the other SPI devices.

[hiram]

Yes the code is fine, my problem is in the power supply, use a voltage with a one regulator of 5V, when apply external voltage the screen turn black or sometimes white.
Now apply voltage the circuit with usb cable and all is ok, i search more information about how to connect gameduino with external supply.

Thank you for your reply and your suggestions.