RCS file: RCS/leddrvr.asm,v
Working file: leddrvr.asm
head: 1.13
branch:
locks: strict
	tundra: 1.13
access list:
symbolic names:
keyword substitution: kv
total revisions: 13;	selected revisions: 13
description:
Driver code for homemade 7-segment display board.
----------------------------
revision 1.13	locked by: tundra;
date: 2002/03/25 16:55:26;  author: tundra;  state: Exp;  lines: +16 -10
Added code to keep TMR0 counting going during the TMR0 ISR.
This keeps the timing much more accurate - i.e., 1ms/interrupt.
----------------------------
revision 1.12
date: 2002/03/25 15:42:18;  author: tundra;  state: Exp;  lines: +71 -82
Restructured the LED display code to only compute the segments
needed for the currently displayed LED.  This eliminated the
need for a 'bin2seg' subroutine and for the'digit0' array, but
added a new 'temp' variable.
----------------------------
revision 1.11
date: 2002/03/23 02:56:28;  author: tundra;  state: Exp;  lines: +135 -135
Reformated back to 8-wide tabs.
----------------------------
revision 1.10
date: 2002/03/20 18:57:34;  author: tundra;  state: Exp;  lines: +163 -194
Changed some of the timing constants slightly.
Cosmetic & formatting changes to use 4 wide tab stops.
----------------------------
revision 1.9
date: 2002/03/20 13:26:17;  author: tundra;  state: Exp;  lines: +25 -17
Rewrote waiting routine to use TMR0 interrupt interval for timing.
----------------------------
revision 1.8
date: 2002/03/20 12:51:14;  author: tundra;  state: Exp;  lines: +45 -6
Setup TMR0 for 1ms interrupts.
Separated counting and binary-to-7segment conversion into two
separate subroutines.
Added code to prime TMR0 during initialization.
----------------------------
revision 1.7
date: 2002/03/19 17:47:26;  author: tundra;  state: Exp;  lines: +46 -18
Changed display code to properly preserve state of unused bits
of 'led_sel' port.
----------------------------
revision 1.6
date: 2002/03/18 19:29:12;  author: tundra;  state: Exp;  lines: +39 -18
Broke wait logic into separate subroutine using a nested loop
with counters is 'W' and 'wait_count'.
----------------------------
revision 1.5
date: 2002/03/18 17:35:41;  author: tundra;  state: Exp;  lines: +42 -9
Enabled TMR0-driven interrupt servicing of the display.
Added wait after count increment (to slow down display change)
using 'loopcount' register variable.
----------------------------
revision 1.4
date: 2002/03/17 03:59:13;  author: tundra;  state: Exp;  lines: +50 -73
Consolidated all initialization logic into a single subroutine.
Cleaned up comments.
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revision 1.3
date: 2002/03/17 03:45:23;  author: tundra;  state: Exp;  lines: +57 -43
Rewrote display routine to display one digit per invocation,
rotating from MSD to LSD.
----------------------------
revision 1.2
date: 2002/03/15 17:40:04;  author: tundra;  state: Exp;  lines: +96 -40
Restructured code slighly to more cleanly separate counting from display.
Changed counting routine to increment by one and return.
Added scaffolding for interrupt handler yet to be finished.
----------------------------
revision 1.1
date: 2002/03/15 01:19:11;  author: tundra;  state: Exp;
Initial revision
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