Interfacing ADS1244

Projects Networking, Protocols, and Devices
6

With that code in setup you get a 2.4MHz clock signal on pin 3.

void setup() {
  pinMode(3, OUTPUT);
  TCCR2A = 0x33;
  TCCR2B = 0x09;
  OCR2A = 0x06;
  OCR2B = 0x03;
}

Code for reading the data:

while (digitalRead(DATA_PIN) == HIGH); // wait for data ready
uint32_t value = shiftIn(DATA_PIN, CLOCK_PIN, MSBFIRST);
value <<= 8;
value |= shiftIn(DATA_PIN, CLOCK_PIN, MSBFIRST);
value <<= 8;
value |= shiftIn(DATA_PIN, CLOCK_PIN, MSBFIRST);
digitalWrite(CLOCK_PIN, HIGH);
digitalWrite(CLOCK_PIN, LOW); // 25th pulse to keep DATA high till next data ready

Keep in mind that DATA_PIN has to be in input mode while CLOCK_PIN has to be an output.

Hope that helps to get you started.