Subject:
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Re: Possible bug? Simple light sensor condition checking.
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Mon, 16 Jul 2007 16:50:09 GMT
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Viewed:
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16504 times
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I use BrickOS (LegOS) but I'm not expert in the inner workings.
The code you have here appears fine to me. So, it may be a bug in
BrickOS, or a problem elsewhere in your code.
I will say I've ran into some interesting things when using
tasks. Sometimes, you have to include a wait, to suspend the current
task, and allow others to execute. The cputs may include something like that.
So, the problem may be a bug in BrickOS, but the solution may be in
how you start & switch your tasks.
Steve
At 11:13 AM 7/16/07, Timothy Su wrote:
> I tried my own skill on writing a program for the included lego test pad (RIS
> 2.0), and I discovered something weird. The following code does set the
> conditions right, but the following code doesn't set the conditions right if I
> comment out the 'cputs("");'. Any idea why?
>
> int offonpad =0;
>
> int check_off_pad(int argc, char *argv[]) {
> while(!shutdown_requested()) {
> if(LIGHT(LIGHTSENS) < 40) {
> offonpad = 1;
> }
> else {
> offonpad = 0;
> }
> cputs("");
> }
> return 0;
> }
>
> What doesn't work is (it fails to set the varible, if i initialize offonpad as
> 1, its always one. If i initialize offonpad as 0, it is always zero.):
>
> int check_off_pad(int argc, char *argv[]) {
> while(!shutdown_requested()) {
> if(LIGHT(LIGHTSENS) < 40) {
> offonpad = 1;
> }
> else {
> offonpad = 0;
> }
> //cputs("");
> }
> return 0;
> }
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