Sample code in C for controlling PSC serial

rockerboy

Hi,

Is there any sample code in C for controlling PSC serial available from Parallax?

Thanks,

Franklin

Probably not. All you need is to send to the PSC the strings it wants to hear. You can find those in the documentation.

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- Stephen

rockerboy

Franklin said...
Probably not. All you need is to send to the PSC the strings it wants to hear. You can find those in the documentation.

Ok. But if I send it '!', 'S', 'C', etc using the below C code, the PSC is not responding.
·

C Code...
unsigned char c;
c = '!';
write(PSC_sd, &c, 1);
c = 'S';
write(PSC_sd, &c, 1);
c = 'C';
write(PSC_sd, &c, 1);
c = 0x00;
write(PSC_sd, &c, 1);
c = 0x0F;
write(PSC_sd, &c, 1);
c = 0xE2;
write(PSC_sd, &c, 1);
c = 0x4;
write(PSC_sd, &c, 1);
c = '\n';

write(PSC_sd, &c, 1);

So, I was wondering what I could send it to make it behave similar to if I program it using BASIC with:

Basic Code...
····
···· ramp = $F············ ' Ramp (speed)
···· servoAddr = 0········ ' Channel 0
···· position = 1250

··· SEROUT PSC,N2400,[noparse][[/noparse]"!SC",ServoAddr, Ramp,position.LOWBYTE, position.HIGHBYTE, CR]

Mike Green

The problem is that we have no idea how your C system works and the specifics of how I/O works in your C implementation is crucial to getting this to work. You'll just have to sit down with your manuals to figure out how to properly open a serial device at 2400 Baud, 8 bits, non-inverted logic. We can't tell you how to do that.

Peter Verkaik

Attached· are a few Javelin classes (Javelin java is almost like C) that you can
open in any text editor.
The Javelin uses the Uart object to open a serial channel. Like Mike said,
you need to figure out how to open a serial port on your system.
Apart from that, the remaining code should be useful.

Edit: The javelin integers are 16bit signed. Keep that in mind when converting code
to your system, as that may well use 32bit integers.

regards peter

Post Edited (Peter Verkaik) : 11/13/2007 5:20:21 AM GMT

Chris Savage

There is an example of C communication with the PSC in our Completed Projects Forum. Please see the link below. I hope this helps. Take care.

http://forums.parallax.com/showthread.php?p=611904


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Chris Savage
Parallax Tech Support