/*
 * Toshiba T1000 Keyboard interpreter
 *
 * Converts signals from a T1000 keyboard's key matrix to a stndard USB keyboard when using a Teensy LC.
 *
 * 2017 Chad Boughton
 */

#include <Keypad.h>

const byte ROWS = 5;
const byte COLS = 8;
char keys[ROWS][COLS] = {
  {KEY_1,KEY_2,KEY_3,KEY_4,KEY_5,KEY_6,KEY_7,KEY_8},
  {KEY_9,KEY_0,KEY_A,KEY_B,KEY_C,KEY_D,KEY_E,KEY_F},
  {KEY_G,KEY_H,KEY_I,KEY_J,KEY_K,KEY_L,KEY_M,KEY_N},
  {KEY_O,KEY_P,KEY_Q,KEY_R,KEY_S,KEY_T,KEY_U,KEY_V},
  {KEY_W,KEY_X,KEY_Y,KEY_Z,KEY_ENTER,KEY_TILDE,KEY_DELETE,KEY_BACKSPACE}
};
byte rowPins[ROWS] = {1,2,3,4,5}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {6,7,8,9,10,11,12,13}; //connect to the column pinouts of the keypad

Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

unsigned long loopCount;
unsigned long startTime;
String msg;
int x = 0;

void setup() {
    Serial.begin(9600);
    loopCount = 0;
    startTime = millis();
    msg = "";
}


void loop() {
    loopCount++;
    //char key = kpd.getKey();
    if ( (millis()-startTime)>5000 ) {
        //Serial.print("Average loops per second = ");
        //Serial.println(loopCount/5);
        startTime = millis();
        loopCount = 0;
    }


    // Fills kpd.key[ ] array with up-to 10 active keys.
    // Returns true if there are ANY active keys.
    if (kpd.getKeys())
    {
        for (int i=0; i<LIST_MAX; i++)   // Scan the whole key list.
        {
            if ( kpd.key[i].stateChanged )   // Only find keys that have changed state.
            {
                switch (kpd.key[i].kstate) {  // Report active key state : IDLE, PRESSED, HOLD, or RELEASED
                    case PRESSED:
                    msg = " PRESSED.";



                    Serial.print("Key ");
                Serial.print(kpd.key[i].kchar);
                Serial.println(msg);
                // release all the keys at the same instant
                 Keyboard.set_key1(kpd.key[i].kchar);
                Keyboard.send_now();

                //Keyboard.set_key1(0);
                //Keyboard.send_now();
                if (kpd.key[i].kchar == char(KEY_LEFT_SHIFT)) {
                  Serial.print("Shift ");
                  Keyboard.set_modifier(MODIFIERKEY_SHIFT);
                  Keyboard.send_now();
                  x=1;

        }

                break;

                    case HOLD:
                    msg = " HOLD.";
                    //Keyboard.set_modifier(MODIFIERKEY_SHIFT);
                    //Keyboard.send_now();

                    Keyboard.set_key1(kpd.key[i].kchar);
                Keyboard.send_now();

                break;
                    case RELEASED:
                    msg = " RELEASED.";
                    Serial.println(msg);
                    Keyboard.set_key1(0);
                Keyboard.send_now();
                if (kpd.key[i].kchar == char(KEY_LEFT_SHIFT)) {
                  Serial.print("Shift Released ");
                  Keyboard.set_modifier(0);
                  Keyboard.send_now();
                  x=0;
                }

                break;
                    case IDLE:
                    msg = " IDLE.";

                }

            }
        }
    }
}  // End