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[/] [openmsp430/] [trunk/] [fpga/] [xilinx_diligent_s3board/] [software/] [leds/] [7seg.c] - Rev 202
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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++; } }
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