hello everyone,
I'm trying to read values from the MCP3204 but I'm stuck ... I appreciate any help
below is the code that I'm trying to ported in LabView
the thing that bothers me is that the MCP3204 only responds in MODE1 although documentation says it supports MODE0 and MODE1.
I successfully connected the MCP4921 DAC and it works perfectly in MODE0
Is it possible to connect two SPI device with different MODEs and how?
idea is to connect DAC and ADC 12bit and comunicate via SPI.
the code below works great when uploading to arduino, problem is how to ported to labview.
working code:
#define SELPIN 10 //Selection Pin
#define DATAOUT 11//MOSI
#define DATAIN 12//MISO
#define SPICLOCK 13//Clock
int readvalue;
void setup(){
//set pin modes
pinMode(SELPIN, OUTPUT);
pinMode(DATAOUT, OUTPUT);
pinMode(DATAIN, INPUT);
pinMode(SPICLOCK, OUTPUT);
//disable device to start with
digitalWrite(SELPIN,HIGH);
digitalWrite(DATAOUT,LOW);
digitalWrite(SPICLOCK,LOW);
Serial.begin(9600);
}
int read_adc(int channel){
int adcvalue = 0;
byte commandbits = B11000000; //command bits - start, mode, chn (3), dont care (3)
//allow channel selection
commandbits|=((channel-1)<<3);
digitalWrite(SELPIN,LOW); //Select adc
// setup bits to be written
for (int i=7; i>=3; i--){
digitalWrite(DATAOUT,commandbits&1<<i);
//cycle clock
digitalWrite(SPICLOCK,HIGH);
digitalWrite(SPICLOCK,LOW);
}
digitalWrite(SPICLOCK,HIGH); //ignores 2 null bits
digitalWrite(SPICLOCK,LOW);
digitalWrite(SPICLOCK,HIGH);
digitalWrite(SPICLOCK,LOW);
//read bits from adc
for (int i=11; i>=0; i--){
adcvalue+=digitalRead(DATAIN)<<i;
//cycle clock
digitalWrite(SPICLOCK,HIGH);
digitalWrite(SPICLOCK,LOW);
}
digitalWrite(SELPIN, HIGH); //turn off device
return adcvalue;
}
void loop() {
readvalue = read_adc(1);
Serial.println(readvalue,DEC);
readvalue = read_adc(2);
Serial.println(readvalue,DEC);
Serial.println(" ");
delay(250);
}
is attacment is one of my unsuccessful attempt
thank in advance
