Checking SPI pins on a DUE(fried?)

Official Hardware Mega Due
1

What is the best way to check to see if the SPI pins are working on a DUE. I tried programming and the usb port came unplugged. Since then it doesn't seem to work. The blink sketch works fine. Maybe I,m just missing something.

2

Hi E-Car,

Have you got a multimeter?

I assume if you are into cars you must have since car electrics are a law unto themselves right? :wink: :stuck_out_tongue:

Right, the SPI pins on the DUE are :- MISO 74, MOSI 75, SCK 76. So, you can check them with a multimeter / led with 200R resistor by the following sketch :-

void setup() {
  // put your setup code here, to run once:
  pinMode(74, OUTPUT);
  pinMode(75, OUTPUT);
  pinMode(76, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(74, LOW);
  digitalWrite(75, LOW);
  digitalWrite(76, LOW);
  delay(2000);
  digitalWrite(74, HIGH);
  digitalWrite(75, HIGH);
  digitalWrite(76, HIGH);
  delay(2000);
}

Hope this helps!

Regards,

Graham

3

The SPI pins on every Arduino are MOSI, MISO and SCK. As in...

  pinMode(MOSI, OUTPUT);
  digitalWrite(MOSI, HIGH);

There's also other fun pins-without-numbers such as TXLED on the Micro.

But remember the Due only has SPI pins on the ISP connector in the middle of the board, not on 11-12-13 like most other Arduinos.

4

Or 50,51,52 on the Mega, but none of this is relevant. he asked about SPI on the DUE!!!

Regards,

Graham

5

The SPI pins on the Due can be accessed as MorganS described.
MISO = D74
MOSI = D75
SCK = D76

void setup() {
  Serial.begin(115200);

  Serial.println(MISO);
  Serial.println(MOSI);
  Serial.println(SCK);
  
}

void loop() {
}