/*#############################################################

Program Name    : ex5_KEYPAD_DISCO_F429I_ConvertToInt
Author          : Grant Phillips
Date Modified   : 10/05/2016
Compiler        : ARMmbed
Tested On       : STM32F4-Discovery

Description     : Example program that demonstrates the use of
                  the KEYPAD_DISCO_F429I class to implement a 4x4
                  keypad on the STM32F429I-Discovery board. 
                  Allows a user to enter a value with the keypad
                  and then converts the string to an integer
                  value after the '#' key is pressed.

Requirements    : * STM32F4-Discovery Board
              
Circuit         : * NONE

##############################################################*/
//

#include "mbed.h"
#include "TS_DISCO_F429ZI.h"
#include "LCD_DISCO_F429ZI.h"
#include "KEYPAD_DISCO_F429ZI.h"

KEYPAD_DISCO_F429ZI keypad;
                           
int main() {
    char buf[20];       //string variable
    char temp[20];
    int bufpos=0;
    char k, key;
    int val;
    
    keypad.Show(1, 1);                              //Display the keypad, enable the Message and Output Box areas
    keypad.WriteMsgBoxLine(0, "Enter a value ... ");    //display a message in the
    keypad.WriteMsgBoxLine(1, "(* clear; # accept)");   //Message Box area of the keypad
   
    while(1) {
        k = keypad.ReadKey();                       //read the current key pressed
        if(k != '\0') {                             //if a key is pressed
            key = k;                                //store the key in a variable
            do                                      //read until key is released
                k = keypad.ReadKey();
            while(k != '\0');
            
            if(key == '*') {
                buf[0] = '\0';                      //'clear' the string
                bufpos = 0;                         //start at character 0
                keypad.WriteOutBox("              ");   //clear the line
            }
            else if(key == '#') {
                val = atoi(buf);                    //convert the buffer string to an integer value
                sprintf(temp, "%d", val);
                keypad.WriteMsgBoxLine(0, "                     "); //clear line 0
                keypad.WriteMsgBoxLine(1, "                     "); //clear line 1
                keypad.WriteMsgBoxLine(0, "You entered a value: ");
                keypad.WriteMsgBoxLine(1, temp);
                buf[0] = '\0';                      //'clear' the string
                bufpos = 0;                         //start at character 0
                keypad.WriteOutBox("              ");   //clear the line
            }
            else {
                buf[bufpos] = key;                  //add current keypressed to the string
                buf[bufpos+1] = '\0';               //add NULL to end of string
                bufpos++;
            }
            keypad.WriteOutBox(buf);                //display result in Output Box area of keypad
        }
    }
}