ADC Reader rev_02

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    - Project: ADC Reader
    - Source Code compiled for: Arduino Mega
    - Source Code created on: 2025-03-05 11:51:26

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* i need to interface the arduino mega with the */
    /* MCP3208 ADC in order to read voltages */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <SPI.h>  // Include SPI library

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

// Define SPI pins for Arduino Mega
#define SELPIN 10 // Chip select (CS)
#define DATAOUT 51 // MOSI (Master Out, Slave In)
#define DATAIN  50 // MISO (Master In, Slave Out)
#define SPICLOCK  52 // SCK (Serial Clock)

// Function to initialize SPI and serial communication
void setup() {
    pinMode(SELPIN, OUTPUT);
    digitalWrite(SELPIN, HIGH); // Deselect ADC

    SPI.begin(); // Initialize SPI
    SPI.setClockDivider(SPI_CLOCK_DIV16); // Set SPI clock speed
    SPI.setDataMode(SPI_MODE0); // MCP3208 uses SPI Mode 0
    SPI.setBitOrder(MSBFIRST); // MCP3208 expects MSB first

    Serial.begin(57600); // Start serial communication
}

int read_adc(int channel) {
    if (channel < 0 || channel > 7) return -1; // Invalid channel check

    digitalWrite(SELPIN, LOW); // Enable MCP3208

    // MCP3208 requires a 5-bit command: Start (1), Single-ended (1), 3-bit channel, followed by 7 extra bits
    byte command = 0b00000110 | (channel >> 2); // Start bit + Single-ended + 3-bit channel
    byte msb = (channel & 0b11) << 6; // Remaining 2 channel bits in upper byte

    // Send command and receive response
    byte highByte = SPI.transfer(command);
    byte lowByte = SPI.transfer(msb);
    byte extraByte = SPI.transfer(0x00); // Read remaining bits

    digitalWrite(SELPIN, HIGH); // Deselect ADC

    // Combine bytes into a 12-bit result
    int adcValue = ((highByte & 0x0F) << 8) | lowByte;

    return adcValue;
}

void loop() {
    Serial.println("---------------");

    for (int i = 0; i < 8; i++) {
        int value = read_adc(i);
        Serial.print("Chan ");
        Serial.print(i);
        Serial.print(":   ");
        Serial.println(value);
    }

    delay(1000);
}

/* END CODE */