Vex Library and Sample Code

[foobert]

Originally Posted by tacman1123

I'm hoping I'm missing something really obvious. I've looked though the ifi_*.c files, and the .h files, and everything is very low-level. I was using get_input(1) as an example, but I don't believe there is a get_input function. Is there one? If so, where is it?

Is there sample code somewhere that turns two motors on and goes for 5 seconds, or reads a switch (or even better, the remote control unit)? Right now, it looks like if you want to simply go forward for 5 seconds, you have immerse yourself in hundreds of lines of code. Again, I keep hoping there's some high-level function calls documented somewhere that I just can't see (again, beside the ones in EasyC).


Tac

oops. sorry, thought you were maybe talking about some existing easyC code about which i know nothing.

to test for a limit switch closed on pin 1 in the analog/digital section of the rc and then send the damped signal from channel 1 of the radio to a motor connected to motor port 1 on the rc, use

if (rc_dig_in01 == 0)
pwm01 = pwm_in1 / 5 + 100;

the names used are all defined in ifi_aliases.h. the code would probably go into user_routines.c which runs every 18.5 ms.

[tacman1123]

Originally Posted by foobert

to test for a limit switch closed on pin 1 in the analog/digital section of the rc and then send the damped signal from channel 1 of the radio to a motor connected to motor port 1 on the rc, use

if (rc_dig_in01 == 0)
pwm01 = pwm_in1 / 5 + 100;

the names used are all defined in ifi_aliases.h. the code would probably go into user_routines.c which runs every 18.5 ms.

This is exactly what I'm looking for -- thanks! Is there documentation on this anywhere, besides reading the source code comments? How does one know what rc_dig_in01, pwm01 and pwm_in1 are?

Or sample programs, simpler than the VexCode on vexlabs.com? Something like the GearToothTest that Brad has in WPILib, mentioned in the previous post?

Again, thanks very much, I feel like I'm at least getting closer to understanding how to program without EasyC.

Tac

[foobert]

Originally Posted by tacman1123

This is exactly what I'm looking for -- thanks! Is there documentation on this anywhere, besides reading the source code comments? How does one know what rc_dig_in01, pwm01 and pwm_in1 are?

Or sample programs, simpler than the VexCode on vexlabs.com? Something like the GearToothTest that Brad has in WPILib, mentioned in the previous post?

Again, thanks very much, I feel like I'm at least getting closer to understanding how to program without EasyC.

Tac

arrrgh, you wouldn't believe the long insightful answer i had for you when my connection timed out...

the short answer is study the sample code and refer to the 18f8520 datasheet, (watch any ad for a prescription med on the tele for a list of possible side effects), and have a look at theEntropyWorks.com, (a fine example of good intentions and what becomes of them).

anyway, to use pin 1 for input initialize io1 = 1 and to set it to output io1 = 0. when the rc powers up all pins are set to input so that you need not worry that the attached chainsaw on your deathbot will gobble your arm before you can jump clear.

must go to work...

[tacman1123]

Upgrading to EasyC 2.0 solved half my problem, as there is now a call GetRxInput(rx, channel) that gets the values I was looking for.

I think Brad Miller's WPILib will solve some of the rest of the problems, but I'll have to wait until that's out to see.

Thanks for your reply.

Tac

[foobert]

Originally Posted by tacman1123

Upgrading to EasyC 2.0 solved half my problem, as there is now a call GetRxInput(rx, channel) that gets the values I was looking for.

i'm guessing that rx is receiver 1 or 2 and that channel is 1 through 6. since there's no way to return an error indication, if we get rx 10, channel 9, we'll just return the first channel from the first receiver.

unsigned char GetRXInput (unsigned char rx, unsigned char channel) {
  unsigned char bar;

  switch (rx * 6 + channel) {
    default:
    case 1 : bar = PWM_in1;  break;
    case 2 : bar = PWM_in2;  break;
    case 3 : bar = PWM_in3;  break;
    case 4 : bar = PWM_in4;  break;
    case 5 : bar = PWM_in5;  break;
    case 6 : bar = PWM_in6;  break;
    case 7 : bar = PWM_in7;  break;
    case 8 : bar = PWM_in8;  break;
    case 9 : bar = PWM_in9;  break;
    case 10 : bar = PWM_in10;  break;
    case 11 : bar = PWM_in11;  break;
    case 12 : bar = PWM_in12;  break;
  }
  return bar;
}

don't forget to include ifialiases.h.

[Vexguy365]

I have tried writing the code in MPLab but have yielded disatsrous results. I have EasyC v.1 but lost my CD after unisntalling it . Can anyone e-mail me the install file on the CD? I still have all of my other info such as installation key etc. but need the install file one the CD to reinstall it. e-mail me at beattieboy@comcast.net. Thanks - VEXguy365