I'm trying to get the TI ADS1234 working - I've searched the forums, no love... My setup is pretty much the same as in this post:
http://forum.arduino.cc/index.php?topic=134558.msg1011805
The RDY never goes LOW. The only difference between his wiring and mine is:
22 => 5V through a 10uF cap (as indicated in Figure 42 of the datasheet, for Weight Scale Application)
26 => Arduino digital pin 8
I also run all the power through a digital output (pin 9), so I can power up the device first with 26 LOW, then after powered up, switch 26 HIGH as described in the power up sequence (page 23).
I tried two different chips, both did the same thing (which is to say nothing)... I tried pulling down and bringing back up 26 as someone suggested in his thread, but no luck.
Here's the code I'm using is based off of some I saw for the 1244 which is similar, and I just tried to match how communications should take place as described in the datasheet:
/*
ADS1234
*/
#define DATA (12)
#define SCLK (13)
#define POWER (9)
#define RESET (8)
void setup()
{
pinMode(RESET, OUTPUT);
pinMode(POWER, OUTPUT);
pinMode(DATA, INPUT);
pinMode(SCLK, OUTPUT);
digitalWrite(RESET, LOW);
digitalWrite(POWER, LOW);
digitalWrite(SCLK, LOW);
Serial.begin(19200);
delay(1000);
Serial.println("Power up device");
digitalWrite(POWER, HIGH);
delay(1000);
Serial.println("Startup sequence");
digitalWrite(RESET, HIGH);
delay(1000);
}
void loop()
{
int32_t value = 0;
delay(300);
digitalWrite(SCLK, LOW);
value = digitalRead(DATA);
Serial.println("Loop");
while (digitalRead(DATA) == HIGH);
Serial.println("Read");
digitalWrite(SCLK, HIGH);
value = shiftIn(DATA, SCK, MSBFIRST);
value <<= 8;
value |= shiftIn(DATA, SCK, MSBFIRST);
value <<= 8;
value |= shiftIn(DATA, SCK, MSBFIRST);
digitalWrite(SCLK, LOW);
value = ((signed long) (value << 8)) >> 8;
Serial.println("Value = ");
Serial.println(value);
}
Any help or insight would be greatly appreciated - and I promise to post how the issue was resolved, so future hackers don't need to spin their wheels again. 