SPI on Arduino not working? [solved]

Hi there,

has anybody SPI working on the arduino?

I attached a logic analyzer to the connector J20 (MOSI J20.2, SCK J20.3, GND J20.4).
This example code does not seem seem to work.

Code:

#include <SPI.h>

void setup() {
  SPI.begin();
  SPI.setBitOrder(MSBFIRST);
  SPI.setDataMode(SPI_MODE0);
  SPI.setClockDivider(42);
}

void loop() {
  delay(100);
  SPI.transfer(0xAA);
  delay(100);
  SPI.transfer(0xFF);
}

According to http://21stdigitalhome.blogspot.de/2013/02/arduino-due-hardware-spi.html MOSI should be digital pin number 75 and SCK should be pin number 76.
When I toggle the MOSI and SCK pins via digital out I can see the changes in my logic analyzer. So the hardware connection seems to be OK.

Code:

#define TEST_MOSI 75
#define TEST_CLK 76

void setup() {
  pinMode(TEST_MOSI, OUTPUT);
  pinMode(TEST_CLK, OUTPUT);
}

void loop() {
  delay(100);
  digitalWrite(TEST_MOSI, 0);
  digitalWrite(TEST_CLK, 0);
  delay(100);
  digitalWrite(TEST_MOSI, 1);
  digitalWrite(TEST_CLK, 1);
}

Anybody an idea?

Thanks,
frankalicious

 

Re: SPI on Arduino not working?

Silly me.
I thought I see spikes on the logic analyzer but after zooming in I can see the expected data.