#include "Arduino.h"

const byte numChars = 32;
char receivedChars[numChars];   // an array to store the received data

boolean newData = false;

void setup() {
  Serial.begin(9600);


  pinMode(A0, OUTPUT);
  pinMode(A1, OUTPUT);
  pinMode(A2, OUTPUT);
  pinMode(A3, OUTPUT);
  pinMode(A4, OUTPUT);
  pinMode(A5, OUTPUT);

  Serial.println("mc8051.de Speaker Switch");
}

void loop() {
  recvWithEndMarker();


  if (newData == true) {
    newData = false;

    if (strcmp(receivedChars, "ch00-l-0") == 0) {
      digitalWrite(A0, LOW);
    } else if (strcmp(receivedChars, "ch00-l-1") == 0) {
      digitalWrite(A0, HIGH);
    } else if (strcmp(receivedChars, "ch00-r-0") == 0) {
      digitalWrite(A3, LOW);
    } else if (strcmp(receivedChars, "ch00-r-1") == 0) {
      digitalWrite(A3, HIGH);
    } else if (strcmp(receivedChars, "ch01-l-0") == 0) {
      digitalWrite(A1, LOW);
    } else if (strcmp(receivedChars, "ch01-l-1") == 0) {
      digitalWrite(A1, HIGH);
    } else if (strcmp(receivedChars, "ch01-r-0") == 0) {
      digitalWrite(A4, LOW);
    } else if (strcmp(receivedChars, "ch01-r-1") == 0) {
      digitalWrite(A4, HIGH);
    } else if (strcmp(receivedChars, "ch02-l-0") == 0) {
      digitalWrite(A2, LOW);
    } else if (strcmp(receivedChars, "ch02-l-1") == 0) {
      digitalWrite(A2, HIGH);
    } else if (strcmp(receivedChars, "ch02-r-0") == 0) {
      digitalWrite(A5, LOW);
    } else if (strcmp(receivedChars, "ch02-r-1") == 0) {
      digitalWrite(A5, HIGH);
    }    else {
      Serial.print("Unknown command ");
      Serial.println(receivedChars);
    }
  }
}

void recvWithEndMarker() {
  static byte ndx = 0;
  char endMarker = '\n';
  char rc;

  while (Serial.available() > 0 && newData == false) {
    rc = Serial.read();

    if (rc != endMarker) {
      receivedChars[ndx] = rc;
      ndx++;
      if (ndx >= numChars) {
        ndx = numChars - 1;
      }
    }
    else {
      receivedChars[ndx] = '\0'; // terminate the string
      ndx = 0;
      newData = true;
    }
  }
}