Question

write a program for the microcontroller-msp430fr6989 using code composer studio not assembly language.

write a code that transmits a single character and lights the red LED upon receiving that character. The board will "talk" to itself. The green LED should turn on whenever a message is sent and the LCD will display the message being received.

Answer 1

float maxTemp = 30.0; // switch on led when temp > maxTemp
int maxTempSensor = (int) ((maxTemp / 100 + .5) * 204.8);
float temperature = 0.0;

int maxSeconds = 10; // send status message every maxSeconds

const int ledPin = 13; // temperature led

const int tempPin = A0; // T36 temperature sensor analog input pin

const int led1Pin = 3; // Yellow
const int led2Pin = 4; // Green
const int led3Pin = 5; // Red

volatile int tempVal;
volatile int seconds = 0;
volatile boolean tempHigh = false;
volatile boolean statusReport = false;

String inputString = "";
String command = "";
String value = "";
boolean stringComplete = false;

The setup() function

void setup(){
//start serial connection
Serial.begin(9600);
Serial.print("Max T: ");
Serial.print(maxTemp);
Serial.print(" Sensor: ");
Serial.println(maxTempSensor);

inputString.reserve(50);
command.reserve(50);
value.reserve(50);

pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);

pinMode(led1Pin, OUTPUT);
pinMode(led2Pin, OUTPUT);
pinMode(led3Pin, OUTPUT);
digitalWrite(led1Pin, LOW);
digitalWrite(led2Pin, LOW);
digitalWrite(led3Pin, LOW);

cli(); // disable global interrupts

// initialize Timer1 for interrupt @ 1000 msec
TCCR1A = 0; // set entire TCCR1A register to 0
TCCR1B = 0; // same for TCCR1B

// set compare match register to desired timer count:
OCR1A = 15624; // turn on CTC mode:
TCCR1B |= (1 << WGM12);
// Set CS10 and CS12 bits for 1024 prescaler:
TCCR1B |= (1 << CS10);
TCCR1B |= (1 << CS12);
// enable timer compare interrupt:
TIMSK1 |= (1 << OCIE1A);

sei(); // enable global interrupts

}

ISR(TIMER1_COMPA_vect)
{
tempVal = analogRead(tempPin);

if (tempVal > maxTempSensor) {
digitalWrite(ledPin, HIGH);
tempHigh = true;
}
else {
digitalWrite(ledPin, LOW);
tempHigh = false;
}

if (seconds++ >= maxSeconds) {
statusReport = true;
seconds = 0;
}
}

void loop(){
int intValue = 0;

if (stringComplete) {
Serial.println(inputString);
boolean stringOK = false;
if (inputString.startsWith("CMD ")) {
inputString = inputString.substring(4);

int pos = inputString.indexOf('=');
if (pos > -1) {
command = inputString.substring(0, pos);
value = inputString.substring(pos+1, inputString.length()-1); // extract command up to \n exluded

if (command.equals("RED")) { // RED=ON|OFF
value.equals("ON") ? digitalWrite(led3Pin, HIGH) : digitalWrite(led3Pin, LOW);
stringOK = true;
}
else if (command.equals("GREEN")) { // GREEN=ON|OFF
value.equals("ON") ? digitalWrite(led2Pin, HIGH) : digitalWrite(led2Pin, LOW);
stringOK = true;
}
else if (command.equals("YELLOW")) { // YELLOW=ON|OFF
value.equals("ON") ? digitalWrite(led1Pin, HIGH) : digitalWrite(led1Pin, LOW);
stringOK = true;
}

else if (command.equals("TMAX")) { // TMAX=value
intValue = value.toInt();
if (intValue > 0) {
maxTemp = (float) intValue;
maxTempSensor = (int) ((maxTemp / 100 + .5) * 204.8);
stringOK = true;
}
}
else if (command.equals("SECONDS")) { // SECONDS=value
intValue = value.toInt();
if (intValue > 0) {
maxSeconds = intValue;
stringOK = true;
}
}

} // pos > -1
else if (inputString.startsWith("STATUS")) {
Serial.print("STATUS RED=");
Serial.println(digitalRead(led3Pin));
Serial.print("STATUS GREEN=");
Serial.println(digitalRead(led2Pin));
Serial.print("STATUS YELLOW=");
Serial.println(digitalRead(led1Pin));
Serial.print("STATUS TMAX=");
Serial.println(maxTemp);
Serial.print("STATUS SECONDS=");
Serial.println(maxSeconds);
Serial.print("STATUS TEMP=");
Serial.println(temperature);
Serial.print("STATUS THIGH=");
Serial.println(tempHigh);
stringOK = true;
} // inputString.startsWith("STATUS")

} // inputString.startsWith("CMD ")
stringOK ? Serial.println("Command Executed") : Serial.println("Invalid Command");// clear the string for next iteration
inputString = "";
stringComplete = false;
} // stringComplete

if (statusReport) {
temperature = (tempVal * 0.0048828125 - .5) * 100;
Serial.print("STATUS TEMP=");
Serial.println(temperature);
Serial.print("STATUS THIGH=");
Serial.println(tempHigh);
statusReport = false;
}

}

void serialEvent() {
while (Serial.available()) {
// get the new byte:
char inChar = (char)Serial.read();
// add it to the inputString:
inputString += inChar;
// if the incoming character is a newline or a carriage return, set a flag
// so the main loop can do something about it:
if (inChar == '\n' || inChar == '\r') {
stringComplete = true;
}
}
}