SPI connection from an ADIS16210 to an Arduino Mega

[lotm]

Hi all,

I'm trying to read the data from the ADIS16210 IMU to an Arduino Mega(2560). Connections are as follows:
CS (J1-3) - to digital pin 53 (SS)
SCLK (J1-2) - to digital pin 52 (SCK)
DOUT (J1-4) - to digital pin 50 (MISO)
DIN (J1-6) - to digital pin 51 (MOSI)
VCC (J1-12) - to 5V
GND (J1-9) - to GND

Edit: I forgot to mention that the IMU comes with the ADIS16ACL1/PCBZ breakout board if that's helpful information

Manual can be found here: ADIS16210 (Rev. E) (analog.com)

And my code so far is this:

#include<SPI.h> 
#define SS 53
void setup (void)
{
  Serial.begin(9600);
  SPI.begin(); 
  SPI.beginTransaction(SPISettings(830000,MSBFIRST,SPI_MODE3));
  digitalWrite(SS,HIGH);
}

void loop(void)
{
  byte r[2];
  digitalWrite(SS, LOW);
  SPI.transfer(0x04);   //0x04 is XACCL_OUT
  r[0] = SPI.transfer(0x00);
  r[1] = SPI.transfer(0x00); //possibly redundant? Manual says that it returns 16bits and
                                               // byte r; r=SPI.transfer(0x00); still returns 0
  Serial.print(r[0]);
  Serial.print(" ");
  Serial.print(r[1]);
  Serial.println(" ");
  digitalWrite(SS, HIGH);  
  
  delay(500);
}

My issue is that the serial monitor will only display "0 0" each line no matter how I move it. I know I still need to convert the data, but shouldn't that value at least change when I move the IMU.

I'm very new to SPI connections. Any insight would be extremely helpful thank you.

[pylon]

The ADIS10210 is a 3.3V device. You operate it at 5V which is outside the specs although inside the maximum ratings. So this won't damage the chip but it's not guaranteed that it works at that voltage (although I would expect it).

The chip uses 16bit transfers for communication. So you either have to use two calls to SPI.transfer() or use the convenience method transfer16() which does the same for you.