#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
 
#include "TM4C123GH6PM.h"
#include "ez123G.h"
#include "MyDefines.h"
 
char str[100];
char ReadKeyPad();
 
int main(void)
{
    PEZOBJ_LCD  lcd;
    uint16_t    i = 0;
 
    // GPIO Initialization and Configuration
    // 1. Enable Clock on GPIOs
    SYSCTL->RCGCGPIO |= 0x1B;
    // allow time for clock to stabilize
    while ((SYSCTL->PRGPIO & 0x1B) != 0x1B) {};
    // 2. Unlock PD7 and/or PF0 for TM4C 123G
    // 3. Config AMSEL to disable analog function
    // 4. Config PCTL to select 0-GPIO
    // 5. Set AFSEL bits to 0			
    // 6. Set DIR to 0 for input, 1 for output
			
		GPIOA -> DIR = 0x00;
		GPIOB -> DIR = 0x03;
		GPIOD -> DIR = 0x0F;
		GPIOE -> DIR = 0x3E;
 
    // 7. Set PUR/PDR/ODR bits to 1 to enable internal pull-up/-down resistir and/or open-drain
		GPIOB -> ODR = 0x03;
		GPIOE -> ODR = 0x30;
		GPIOA -> PUR = 0xE0;
		GPIOB -> PUR = 0x10;
			
    // 8. Set DEN bits to 1 to enable all 
		GPIOA -> DEN = 0xE0;
		GPIOB -> DEN = 0x13;
		GPIOD -> DEN = 0x0F;
		GPIOE -> DEN = 0x3E;
 
 
    lcd = ezLCD_Create();
    ezLCD_Connect_DataPort(lcd, GPIOD, PIN_3_0);
    ezLCD_Connect_ENPin(lcd, GPIOE, PIN1);
    ezLCD_Connect_RSPin(lcd, GPIOE, PIN2);
    ezLCD_Connect_RWPin(lcd, GPIOE, PIN3);
 
    ezLCD_Start(lcd);
    ezLCD_ClearDisplay(lcd);
    ezLCD_Position(lcd, 1, 0);
    ezLCD_PrintString(lcd, "HELLO");
 
		char ch;
    while(1){
        ch = ReadKeyPad();
 
        if (ch == '*'){
            i *= 100;
            ezLCD_ClearDisplay(lcd);
        }
        if (ch == '#') i = 0;
        if (ch >='0' && ch <= '9') i = i*10 + ch - '0';
 
        sprintf(str, "%d   ", i);
        ezLCD_Position(lcd, 0, 0);
        ezLCD_PrintString(lcd, str);
 
        timer_waitMillis(100);
    }
}
//--------------------------------------------------------------
char KeyPad[4][4]={
    {'1','2','3','A'},
    {'4','5','6','B'},
    {'7','8','9','C'},
    {'*','0','#','D'}};

char ReadKeyPad()
{
    int row;
		GPIOB -> DATA |= 0x03;
		GPIOE -> DATA |= 0x30;
		for(row = 0; row < 4; row++){
			switch(row){
				case 0:
					GPIOB -> DATA &= ~0x01;
					break;
				case 1:
					GPIOB -> DATA |= 0x01;
					GPIOB -> DATA &= ~0x02;
					break;
				case 2:
					GPIOB -> DATA |= 0x02;				
					GPIOE -> DATA &= ~0x10;
					break;
				case 3:
					GPIOE -> DATA |= 0x10;
					GPIOE -> DATA &= ~0x20;
					break;
			}
			
			timer_waitMillis(10);
			
			if(!(GPIOB -> DATA & 0x10))
			{
					while(!(GPIOB -> DATA & 0x10)){}
					return KeyPad[row][0];
			}
			if(!(GPIOA -> DATA & 0x20)) 
			{
					while(!(GPIOA -> DATA & 0x20)){}
					return KeyPad[row][1];
			}
			if(!(GPIOA -> DATA & 0x40))
			{
					while(!(GPIOA -> DATA & 0x40)){}
					return KeyPad[row][2];
			}
			if(!(GPIOA -> DATA & 0x80)) 
			{
					while(!(GPIOA -> DATA & 0x80)){}
					return KeyPad[row][3];
			}
			
			row++;
		}

    return 0x0;
}