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/*
SSTRB goes low when the ADC begins a conversion and goes
high when the conversion is finished
SSTRB goes low at the beginning of calibration and goes
high to signal the end of calibration
Control byte format
7 - (MSB) START The first logic "1" bit, after CS goes low, defines the beginning of the Control Byte
6 - UNI/BIP 1 = unipolar, 0 = bipolar
5 - INT/EXT Selects the internal or external conversion clock. 1 = Internal, 0 = External.
4 - M1 M1 M0 MODE
3 - M0 0 0 24 External clocks per conversion (short acquisition mode)
0 1 Start Calibration. Starts internal calibration.
1 0 Software power-down mode
1 1 32 External clocks per conversion (long acquisition mode)
2 - programmable bit P2
1 - programmable bit P1
0 - programmable bit P0
*/
#define CALIBRATION 0b11101000
#define START 0b11100000
#include <SPI.h>
int sstrb = 8;
int adcPin = 9;
int sdPin = 10;
unsigned int adcValue = 0;
byte LowByte,HighByte;
void setup() {
pinMode(sstrb,INPUT);
pinMode(adcPin, OUTPUT);
pinMode(sdPin, OUTPUT);
digitalWrite(adcPin,HIGH);
digitalWrite(sdPin,HIGH);
Serial.begin(115200);
SPI.begin();
SPI.setBitOrder(MSBFIRST);
SPI.setClockDivider(SPI_CLOCK_DIV4);
SPI.setDataMode(SPI_MODE0);
delay(100);
digitalWrite(adcPin,LOW);
SPI.transfer(CALIBRATION); //kalibrálás
while(!digitalRead(sstrb)){}
SPI.transfer(START); //mérés indítás
}
void loop(){
while(!digitalRead(sstrb)){}
adcValue=SPI.transfer(START);
Serial.print("ADC: ");
Serial.println(adcValue);
}
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