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Dear "Group",
....what are we? Lugnetters? Lugheads? Lugnuts?
Regardless, I need some guidance on getting my Handyboard to run a
downloaded Main( ) program upon powerup/reset. Here are some facts
regarding my problem.
1. The Handyboard downloads the Pcode properly and the LCD displays the "IC
v3.1 Handy Board 1.2" message plus a pulsing heartbeat.
2. I can execute the various IC commands from my PC.... beep( ), read memory
locations with peek( ), turn motors on and off, read Knob, etc.
3. I can download a Main( ) program (filename jrm1.c) to the Handy Board and
them make it run by typing " main ( )" on the PC. I can unplug the serial
cable and the Handy Board will continue to execute the " main( )" program
sequences.
4. I leave the serial cable plugged into the HB and I do not turn off the HB
power switch. If I quit IC (on the PC) and restart, then type " list
files"(after the IC initialization process with the HB), IC does not list
my main( ) program (filename jrm1.c). If I try to run my main( ) program
(filename jrm1.c), IC displays "Function main undefined".
5. I unplug the serial cable from the HB, turn off the HB power switch, and
leave IC running on the PC. Leave HB power off for 10 minutes. Plug serial
cable back into the HB and turn on the HB power switch. Instead of
executing my " main( )" program (filename jrm1.c), the LCD displays the "IC
v3.1 Handy Board 1.2" message with heartbeat. Now, type " main( )" on the
PC and my "main( )" program (filename jrm1.c) runs properly.
6. I have oscilloscoped the 62256 RAM chip's MEM-PWR pin and see no
interruption of power when the HB power switch is turned off and on.
Operation of the DS1233 (and subsequent 74HC132 gates) seems correct at the
62256's "/E" pin (20).
7. The red LED11 PWR LED (led 11) "winks" upon reset and the the
oscilloscope shows a normal reset waveform at pin 17 on the 68HC11. Reset
also seems to correctly influence the "/E" pin (20) on the 62256.
8. Before downloading any " main( )" program to the HB, using IC, I peek
(49150) [$BFEE] and (49151) [$BFFF] and see a reset vector of $C500 which, I
believe, is the location of IC on the HB.
If I download a " main( )" program to the HB and then peek (49150) and peek
(49151) the reset vector has not changed.
I'm about at wit's end trying to get my HB to run a " main( )" program upon
powerup reset. Can anyone suggest additonal tests I might perform or
provide some insight on what I am overlooking/misunderstanding?
Any assistance is greatly appreciated.
Going crazy in Columbus......John
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Message has 2 Replies:
 | | Re: Reset & running Main ( )
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| John, Can you post a copy of your "Main()" file to the following site: (URL) will have to sign up with a yahoo account, but it is a lot easier to deal with code problems and board problems on that forum. -Dan (...) (23 years ago, 30-Dec-01, to lugnet.robotics.handyboard)
| | | Re: Reset & running Main ( )
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| John, a couple things. 1. when you quit and restart IC, it forgets what programs you may have loaded into the HB. so that explains your #4 case below. 2. IC has its own way of storing vectors for user code like your main() program, so you should not (...) (23 years ago, 30-Dec-01, to lugnet.robotics.handyboard)
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