Hi, I try using the AD7856 in Arduino Mega ADK board, I read the datasheet and I have programing under Mode 2, but the AD7856 don't answer me, I connect a oscilloscope to MOSI and MISO lines and Arduino board send correctly the 16bits in MOSI line but in MISO only LOW! so this is my code in Arduino IDE, I hope you can help me!
#include <SPI.h>
uint8_t adcMSB = 0, adcLSB = 0;
unsigned int read_adc;
void setup()
{
SPI.begin();
SPI.setClockDivider(SPI_CLOCK_DIV4); //master clock 4MHZ
SPI.setDataMode(SPI_MODE3); //mode SPI 3
SPI.setBitOrder(MSBFIRST);
pinMode(53,OUTPUT);
digitalWrite(53,HIGH);
pinMode(46,OUTPUT);
digitalWrite(46,HIGH);
Serial.begin(9600);
}
void loop()
{
digitalWrite(46,LOW); //this start the conversion in specific pin CONVST
delay(1); //wait the device busy pin
digitalWrite(46,HIGH); //and start the trans.
digitalWrite(53,LOW); //enable device
adcMSB=SPI.transfer(0b11100001); //here I configure the bits in Control Register, read channel 1, power mode normal
adcLSB=SPI.transfer(0b00010001); //this read from ADC OUTPUT DATA REGISTER, start the Conversion, select mode 2
digitalWrite(53,HIGH); //disable device
delay(300);
//read for results
read_adc= word(adcMSB, adcLSB);
Serial.print(read_adc,HEX);
Serial.print(" ");
Serial.println(read_adc,DEC);
}
and this is my schematic:
