/* Program to read the analog value of the pin connected to the temperature sensor.
 * The potentiometer on the Wytec EduBase/EduPad board is connected pin 28.
 * The ADC has 12 bits for TivaC and 14 bits for MSP432 but default to 10 bits 
 * in Energia. The resolution is set to 12 bit by the statement
 * analogReadResolution(12);
 * so the value has the range of 0 - 4095. 
 * Assume the temperature sensor is an LM45, The value is scaled to degree F  
 * then sent to the Serial monitor. 
 * The bits 7-4 of the conversion result is also written to the LEDs.
 * Make sure the LCD interface selection jumper is set at "serial".
 * 
 * Energia 1.6.10E18
 */

const int LED[] = {3, 4, 19, 38};

void setup()
{
    Serial.begin(9600);
    Serial.println("Temperature sensor:");

    // initialize LED for display
    for (int i = 0; i < 4; i++)
        pinMode(LED[i], OUTPUT);
    
    digitalGroupWrite(LED, 4, 0);
    analogReadResolution(12);
}

/* Tiva TM4C123 */ //const int temp = PE_5;
const int temp = 6;

void loop()
{
    int tempValue;
    float degreeC;
    float degreeF;
    
    // read the voltage fromm ADC
    tempValue = analogRead(temp);
    
    // write it to the Serial monitor
    Serial.print("  Temperature = ");
//    Serial.print(tempValue);
//    Serial.print(", ");
    degreeC = (float)tempValue / 4095 * 3.3 / 0.01;
    Serial.print(degreeC, 2);
    Serial.print(" C, ");
    degreeF = degreeC * 9.0 / 5.0 + 32;
    Serial.print(degreeF, 2);
    Serial.println(" F");
    
    digitalGroupWrite(LED, 4, tempValue >> 4);  // and write it to the LEDs
    delay(100);
}

// write to a group of output pins
void digitalGroupWrite(const int* group, int length, int data)
{
    for (int i = 0; i < length; i++)
        digitalWrite(group[i], data & (1 << i) ? HIGH : LOW);
}