Hi,
I'm trying to communicate with the AD7799 IC and I'm facing the following issue.
All I'm trying to do is write to the Configuration Register and read back the settings I wrote to it.
I'm using an Arduino Pro's SPI BUS (ATMEGA 328P) 8MHz to talk to it,
This is my Code,
void setup()
{
Serial.begin(115200); //Start the Serial Communication at Baud Rate = 115200
SPI.setDataMode(SPI_MODE3); //Clock Idle High and Falling Edge as trigger
SPI.setClockDivider(SPI_CLOCK_DIV8); //Set Clock Frequency
SPI.setBitOrder(MSBFIRST);
pinMode(CS, OUTPUT); // Configuring the chip select pin, D10 as output
SPI.begin(); // Start the SPI
}
void loop()
{
if (Serial.available() > 0)
{
int inByte = Serial.read();
switch (inByte) {
case 'w':
Serial.println("Writing");
digitalWrite(CS,LOW); //Drive CS low to initiate communications
SPI.transfer(0x10); //Writing to Configuration Register
SPI.transfer(0x10); // Unipolar Mode
SPI.transfer(0x20); // Reference Detect Set High and Gain =1
digitalWrite(CS,HIGH); //Drive CS HIGH to end communications
break;
case 'r':
Serial.println("Reading");
digitalWrite(CS,LOW);
SPI.transfer(0x50); //Instructing Comm Reg to begin Read from the Status Register
result1 = SPI.transfer(0x50);
result2 = SPI.transfer(0x50);
digitalWrite(CS,HIGH);
break;
default:
break;
}
}
}
I initiate a read or write on the serial connection my hitting an 'r' for read and 'w' for write. This is the Kind of output I've been observing,
When I do a Write,
When I do a Read I see something weird on the MISO line, This is where I'm stuck
Could someone please help me figure this out?
I'm pretty sure my hardware is hooked up right, here's the way I connected the IC,
