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/*

*********************************************************************************************************

*

* Multiplexed LED Display Driver

*

* (c) Copyright 2004, modified by John Leung

* Reference: Jean J. Labrosse, Embedded Systems Building Blocks

* All Rights Reserved

*

* Filename : LED.C

* Programmer : John Leung

* Remarks : Modified for SaiWanHo project

* Date : 19th Nov 2004

* Hardware : PCB 11OCT2004.001

*********************************************************************************************************

* DESCRIPTION

*

* This module provides an interface to a multiplexed "8 segments x N digits" LED matrix.

*

* To use this driver:

*

* 1) You must define (LED.H):

*

* DISP_N_DIG The total number of segments to display, inc. dp status

* DISP_N_SS The total number of seven-segment digits (modules)

* DISP_PORT1_DIG The address of the DIGITS output port

* DISP_PORT_SEG The address of the SEGMENTS output port

* first_dig_msk The first digit mask for selecting the most significant digit

*

* 2) You must allocate a hardware timer which will interrupt the CPU at a rate of at least:

*

* DISP_N_DIG * 60 (Hz)

*

* The timer interrupt must vector to DispMuxISR (defined in LED_IA.ASM). You MUST write the

* code to clear the interrupt source. The interrupt source must be cleared either in DispMuxISR

* or in DispMuxHandler().

*

* 3) Adapt DispInitPort(), DispOutSeg() and DispOutDig() for your environment.

*********************************************************************************************************

*/

#include "7seg.h"

/*

*********************************************************************************************************

* SEVEN-SEGMENT Digit table

*********************************************************************************************************

*/

INT8U * const DispSegTbl[] = {

  (INT8U *) &DIGIT3,

  (INT8U *) &DIGIT2,

  (INT8U *) &DIGIT1,

  (INT8U *) &DIGIT0

};

/*

*********************************************************************************************************

* ASCII to SEVEN-SEGMENT conversion table

* a

* ------

* f | | b

* | g |

* Note: The segments are mapped as follows: ------

* e | | c

* a b c d e f g | d |

* -- -- -- -- -- -- -- -- ------

* B7 B6 B5 B4 B3 B2 B1 B0

*********************************************************************************************************

*/

const INT8U DispASCIItoSegTbl[] = {// ASCII to SEVEN-SEGMENT conversion table

0x00, // ' '

0x00, // '!', No seven-segment conversion for exclamation point

0x44, // '"', Double quote

0x00, // '#', Pound sign

0x00, // '$', No seven-segment conversion for dollar sign

0x00, // '%', No seven-segment conversion for percent sign

0x00, // '&', No seven-segment conversion for ampersand

0x40, // ''', Single quote

0x9C, // '(', Same as '['

0xF0, // ')', Same as ']'

0x00, // '*', No seven-segment conversion for asterix

0x00, // '+', No seven-segment conversion for plus sign

0x00, // ',', No seven-segment conversion for comma

0x02, // '-', Minus sign

0x00, // '.', No seven-segment conversion for period

0x00, // '/', No seven-segment conversion for slash

0xFC, // '0'

0x60, // '1'

0xDA, // '2'

0xF2, // '3'

0x66, // '4'

0xB6, // '5'

0xBE, // '6'

0xE0, // '7'

0xFE, // '8'

0xF6, // '9'

0x00, // ':', No seven-segment conversion for colon

0x00, // ';', No seven-segment conversion for semi-colon

0x00, // '<', No seven-segment conversion for less-than sign

0x12, // '=', Equal sign

0x00, // '>', No seven-segment conversion for greater-than sign

0xCA, //'?', Question mark

0x00, // '@', No seven-segment conversion for commercial at-sign

0xEE, // 'A'

0x3E, // 'B', Actually displayed as 'b'

0x9C, // 'C'

0x7A, // 'D', Actually displayed as 'd'

0x9E, // 'E'

0x8E, // 'F'

0xBC, // 'G', Actually displayed as 'g'

0x6E, // 'H'

0x60, // 'I', Same as '1'

0x78, // 'J'

0x00, // 'K', No seven-segment conversion

0x1C, // 'L'

0x6E, // 'M', No seven-segment conversion

0x2A, // 'N', Actually displayed as 'n'

0xFC, // 'O', Same as '0'

0xCE, // 'P'

0x00, // 'Q', No seven-segment conversion

0x0A, // 'R', Actually displayed as 'r'

0xB6, // 'S', Same as '5'

0x1E, // 'T', Actually displayed as 't'

0x7C, // 'U'

0x00, // 'V', No seven-segment conversion

0x00, // 'W', No seven-segment conversion

0x00, // 'X', No seven-segment conversion

0x76, // 'Y'

0x00, // 'Z', No seven-segment conversion

0x00, // '['

0x00, // '\', No seven-segment conversion

0x00, // ']'

0x00, // '^', No seven-segment conversion

0x00, // '_', Underscore

0x00, // '`', No seven-segment conversion for reverse quote

0xFA, // 'a'

0x3E, // 'b'

0x1A, // 'c'

0x7A, // 'd'

0xDE, // 'e'

0x8E, // 'f', Actually displayed as 'F'

0xBC, // 'g'

0x2E, // 'h'

0x20, // 'i'

0x78, // 'j', Actually displayed as 'J'

0x00, // 'k', No seven-segment conversion

0x1C, // 'l', Actually displayed as 'L'

0x00, // 'm', No seven-segment conversion

0x2A, // 'n'

0x3A, // 'o'

0xCE, // 'p', Actually displayed as 'P'

0x00, // 'q', No seven-segment conversion

0x0A, // 'r'

0xB6, // 's', Actually displayed as 'S'

0x1E, // 't'

0x38, // 'u'

0x00, // 'v', No seven-segment conversion

0x00, // 'w', No seven-segment conversion

0x00, // 'x', No seven-segment conversion

0x76, // 'y', Actually displayed as 'Y'

0x00 // 'z', No seven-segment conversion

};

/*

*********************************************************************************************************

* DISPLAY ASCII STRING ON SEVEN-SEGMENT DISPLAY

*

* Description: This function is called to display an ASCII string on the seven-segment display.

* Arguments : dig is the position of the first digit where the string will appear:

* 0 for the first seven-segment digit.

* 1 for the second seven-segment digit.

* . . . . . . .

* . . . . . . .

* DISP_N_SS - 1 is the last seven-segment digit.

* s is the ASCII string to display

* Returns : none

* Notes : - Not all ASCII characters can be displayed on a seven-segment display. Consult the

* ASCII to seven-segment conversion table DispASCIItoSegTbl[].

*********************************************************************************************************

*/

void DispStr (INT8U offset, INT8U *s)

{

  int dig        = 0;

  register INT8U* p;

  register INT8U c;

  while (dig < DIGIT_NR) {

    p = DispSegTbl[dig];

    c = *(offset+s);

    *p = DispASCIItoSegTbl[c - 0x20];

    dig++;

    s++;

  }

}