/* Modified:    Matthew Watkins to just include keypad threads & update TFT display
 *
 * File:        TFT_keypad_BRL4.c
 * Author:      Bruce Land
 * Adapted from:
 *              main.c by
 * Author:      Syed Tahmid Mahbub
 * Target PIC:  PIC32MX250F128B
 */

// graphics libraries
#include "config.h"
#include "tft_master.h"
#include "tft_gfx.h"
// need for rand function
#include <stdlib.h>

// threading library
#include <plib.h>
// config.h sets 40 MHz
#define	SYS_FREQ 40000000
#include "pt_cornell_1_2.h"

/* Demo code for interfacing TFT (ILI9341 controller) to PIC32
 * The library has been modified from a similar Adafruit library
 */
// Adafruit data:
/***************************************************
  This is an example sketch for the Adafruit 2.2" SPI display.
  This library works with the Adafruit 2.2" TFT Breakout w/SD card
  ----> http://www.adafruit.com/products/1480

  Check out the links above for our tutorials and wiring diagrams
  These displays use SPI to communicate, 4 or 5 pins are required to
  interface (RST is optional)
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  MIT license, all text above must be included in any redistribution
 ****************************************************/

// PORT B
#define EnablePullDownB(bits) CNPUBCLR=bits; CNPDBSET=bits;
#define DisablePullDownB(bits) CNPDBCLR=bits;

// string buffer
char buffer[60];

// === thread structures ============================================
// thread control structs
// note that UART input and output are threads
static struct pt pt_timer, pt_color, pt_anim, pt_key ;

// system 1 second interval tick
int sys_time_seconds ;

// === Keypad Thread =============================================
// connections:
// A0 -- row 1 -- thru 300 ohm resistor -- avoid short when two buttons pushed
// A1 -- row 2 -- thru 300 ohm resistor
// A2 -- row 3 -- thru 300 ohm resistor
// A3 -- row 4 -- thru 300 ohm resistor
// B7 -- col 1 -- 10k internal pulldown resistor -- avoid open circuit input when no button pushed
// B8 -- col 2 -- 10k internal pulldown resistor
// B9 -- col 3 -- 10k internal pulldown resistor

static PT_THREAD (protothread_key(struct pt *pt))
{
    PT_BEGIN(pt);
    static int keypad, i, pattern;
    // order is 0 thru 9 then * ==10 and # ==11
    // no press = -1
    // table is decoded to natural digit order (except for * and #)
    // 0x80 for col 1 ; 0x100 for col 2 ; 0x200 for col 3
    // 0x01 for row 1 ; 0x02 for row 2; etc
    static int keytable[12]={0x108, 0x81, 0x101, 0x201, 0x82, 0x102, 0x202, 0x84, 0x104, 0x204, 0x88, 0x208};
    // init the keypad pins A0-A3 and B7-B9
    // PortA ports as digital outputs
    mPORTASetPinsDigitalOut(BIT_0 | BIT_1 | BIT_2 | BIT_3);    //Set port as output
    // PortB as inputs
    mPORTBSetPinsDigitalIn(BIT_7 | BIT_8 | BIT_9);    //Set port as input

      while(1) {

        // read each row sequentially
        mPORTAClearBits(BIT_0 | BIT_1 | BIT_2 | BIT_3);
        pattern = 1; mPORTASetBits(pattern);
        
        // yield time
        PT_YIELD_TIME_msec(30);
        //mPORTAClearBits(BIT_0 | BIT_1 | BIT_2 | BIT_3);
        //pattern = 1; mPORTASetBits(pattern);
        for (i=0; i<4; i++) {
            keypad  = mPORTBReadBits(BIT_7 | BIT_8 | BIT_9);
            if(keypad!=0) {keypad |= pattern ; break;}
            mPORTAClearBits(pattern);
            pattern <<= 1;
            mPORTASetBits(pattern);
        }

        // search for keycode
        if (keypad > 0){ // then button is pushed
            for (i=0; i<12; i++){
                if (keytable[i]==keypad) break;
            }
        }
        else i = -1; // no button pushed

        // draw key number
        tft_fillRoundRect(30,200, 100, 28, 1, ILI9341_BLACK);// x,y,w,h,radius,color
        tft_setCursor(30, 200);
        tft_setTextColor(ILI9341_YELLOW); tft_setTextSize(4);
        sprintf(buffer,"%d", i);
        if (i==10)sprintf(buffer,"*");
        if (i==11)sprintf(buffer,"#");
        tft_writeString(buffer);

        // NEVER exit while
      } // END WHILE(1)
  PT_END(pt);
} // keypad thread

// === Main  ======================================================
void main(void) {
 SYSTEMConfigPerformance(PBCLK);
  
  ANSELA = 0; ANSELB = 0; CM1CON = 0; CM2CON = 0;

  // === config threads ==========
  // turns OFF UART support and debugger pin
  PT_setup();

  //internal pull downs for keypad
  EnablePullDownB( BIT_7 | BIT_8 | BIT_9);

  // === setup system wide interrupts  ========
  INTEnableSystemMultiVectoredInt();

  // init the threads
  PT_INIT(&pt_key);

  // init the display
  tft_init_hw();
  tft_begin();
  tft_fillScreen(ILI9341_BLACK);
  //240x320 vertical display
  tft_setRotation(3); // Use tft_setRotation(3) for 320x240 w/ top opposite

  // round-robin scheduler for threads
  while (1){
      PT_SCHEDULE(protothread_key(&pt_key));
      }
  } // main

// === end  ======================================================