input.c

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/*! \file input.c \brief User-Input Functions. */
//*****************************************************************************
//
// File Name    : 'input.c'
// Title        : User-Input Functions
// Author       : Pascal Stang - Copyright (C) 2003
// Created      : 2003.09.11
// Revised      : 2003.09.11
// Version      : 0.1
// Target MCU   : any
// Editor Tabs  : 4
//
// This code is distributed under the GNU Public License
//      which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************

//----- Include Files ---------------------------------------------------------
#include "global.h"     // include our global settings
#include "uart.h"
#include "rprintf.h"    // include printf function library

#include "input.h"

#ifndef INPUT_GETBYTE
#define INPUT_GETBYTE uart1GetByte
#endif

// globals

// functions
u08 inputString(u08 termChar, u08 termLen, u08* data)
{
    int s=-1;
    u08 length=0;

    while(length < termLen)
    {
        // get input
        s = -1;
        while(s == -1)
        {
            s = INPUT_GETBYTE();
        }
    
        // handle special characters
        if(s == 0x08)           // backspace
        {
            if(length > 0)
            {
                // echo backspace-space-backspace
                rprintfChar(0x08);
                rprintfChar(' ');
                rprintfChar(0x08);
                length--;
            }
        }
        else if(s == termChar)  // termination character
        {
            // save null-termination
            data[length] = 0;
            break;
        }
        else
        {
            // echo character
            rprintfChar(s);
            // save character
            data[length++] = s;
        }
    }
    return length;
}

u08 asciiHexToByte(u08* string)
{
    // convert 2-byte hex string to byte
    return (asciiHexToNibble(string[0])<<4) + asciiHexToNibble(string[1]);
}

u08 asciiHexToNibble(u08 character)
{
    // convert 1-byte hex ascii character to nibble
    if((character >= 0x30) && (character <= 0x39))
        return character-0x30;
    else if((character >=  'A') && (character <=  'F'))
        return character-'A'+10;
    else if((character >=  'a') && (character <=  'f'))
        return character-'a'+10;
    else return 0;
}

---