Surveyor Robotics Forum - Executing C-programs

admin YaBB Administrator Posts: 3676	Re: Executing C-programs Reply #30 - 04/23/08 at 3:39pm Try control-[ (control - left bracket), followed by <enter>, if it won't accept ESC The ARM7 C didn't have a sonar() call.
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randy

YaBB Newbies

Posts: 32

Re: Executing C-programs
Reply #31 - 04/24/08 at 1:09am

I have tested some case:

print(time());
=> semicolon expected in print(time());

int t1 = time();
print(t1);
=> semicolon expected in int t1 = 0

int t1;
t1 = time();
print(t1);
=> output 366925, no error

Besides, does sonar connect to pin 27-30, and then data received from C-function sonar()?
Sorry I don't find the information yet.

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« Last Edit: 04/24/08 at 2:10am by randy »

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admin

YaBB Administrator

Posts: 3676

Re: Executing C-programs
Reply #32 - 04/24/08 at 6:20am

That's good information - it appears that the C interpreter is unable to evaluate functions that are called within other functions.

Inputs from sonar modules (Maxbotics) are connected to pins 27-30, and the output trigger is connected to pin 18. Details are here -
http://www.surveyor.com/cgi-bin/yabb2/YaBB.pl?num=1202831771

Note that the sonar() code recognizes whether or not a sonar module is connected, returning 0 for each module that isn't connected.

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SRV-1 Development Team
Surveyor Corporation

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randy YaBB Newbies Posts: 32	Re: Executing C-programs Reply #33 - 04/24/08 at 6:19pm Thanks! It's helpful. We do have the idea to add sensors.
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alarw

YaBB Newbies

Posts: 31

Re: Executing C-programs
Reply #34 - 04/30/08 at 10:22pm

I have been trying to upload the small hello c program to the flash memory using the nc command process you have listed but it doesn't appear to be working. I am using Linux and I run nc 169.254.0.7 from the terminal window and then type zc and it says ##zclear buffer but when I type E then enter then i then enter nothing seems to happen. I then paste your c code into the window and then use Esc then x and when I type zd nothing happens. Can you please post a screenshot so I can see the exact sequence?

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admin YaBB Administrator Posts: 3676	Re: Executing C-programs Reply #35 - 04/30/08 at 10:43pm 'E' just gets you into the editor, and should provide a command menu. 'i' initiates the insert mode, at which point you can paste code, terminated by ESC <enter>, then 'x' to exit back to the monitor. What version of firmware are you running ? The editor was only added in March or thereabouts.
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alarw YaBB Newbies Posts: 31	Re: Executing C-programs Reply #36 - 05/01/08 at 10:00am Thanks for the info. I tried the 031108 version of firmware and it worked great. There must be something wrong with the 032308 version I was originally using. I will download it and try again. Thanks for the help.
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admin YaBB Administrator Posts: 3676	Re: Executing C-programs Reply #37 - 05/01/08 at 11:10am Latest firmware is 042808 - you might give it a try.
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wmcnab

YaBB Newbies

Posts: 30

Re: Executing C-programs
Reply #38 - 05/07/08 at 3:44pm

I finally got back to trying various things and have some interesting results:

Using linux and netcat I was able to get the inf/then statements to work on my original srv1b. It has no sonar but it does seem to work correctly.
I was also able to get it to work using netcat and XP once you suggested I try ctrl [ enter for escape. I had no luck at all with shamcom.

However, on the blackfin on my rover, with the 90 degree camera connector, it just doesn't work. I tried netcat xp, netcat linux, manually entering the data, etc. The program looks fine but it just ignores the if/then statements.

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admin YaBB Administrator Posts: 3676	Re: Executing C-programs Reply #39 - 05/07/08 at 4:24pm Can you provide an example of the if/then code ?
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wmcnab

YaBB Newbies

Posts: 30

Re: Executing C-programs
Reply #40 - 05/08/08 at 6:11am

I used the code you suggested earlier:

main()
{
int x;
x = sonar(1);
if (x <= 1200)
print("stop");
else
print("drive");
}

If I put a print statement before the if statement, it prints fine, but nothing happens afterwards.

I get no error codes or anything, it just goes on waiting for another command.

Can you think of anything else I can try?

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admin YaBB Administrator Posts: 3676	Re: Executing C-programs Reply #41 - 05/08/08 at 6:23am Got it. The "if" statement by itself works okay, but "if" / "then" needs brackets ... main() { int x; x = sonar(1); print("x = " x); if (x <= 1200) { print("stop"); } else { print("go"); } } I will update SRV_protocol_bf to reflect this.
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wmcnab YaBB Newbies Posts: 30	Re: Executing C-programs Reply #42 - 05/09/08 at 1:36pm This does seem to work! Now I'll have to put everything back together and see how it goes. Thanks!
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ucrobotics_ZW

YaBB Newbies

Posts: 14

Re: Executing C-programs
Reply #43 - 11/12/10 at 2:38am

I have met the same problem when exec C programs with "E" command.

See my log:
Code:

#?zd
##zdump: 

main()
{
printf("hello");
}

#?Q
{
 ^
test.c:3: 'main' is undefined
leaving picoC

#?

But if i only run the "printf", it works:
Code:

#?zd
##zdump: 

printf("hello");

#?Q
hello
starting picoc
> - ^[
leaving picoC
#?

So it seems the "main()" function can not be accepted here. What's the reason ?

Another question: In page "http://www.surveyor.com/C.html", only "printf" is definded, but all of above demo are using "print", do you think it can works ?

I'm using the latest firmware.

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tjump Global Moderator Posts: 411	Re: Executing C-programs Reply #44 - 11/12/10 at 6:40am picoC does not recognize main(); so do not use it with picoC. As far as print I always use printf(); Not sure why they are not using this in the examples above. Cheers, T. Jump
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