Can't get the servo to work (Linux)

[crane]

I am running ubuntu 9.10 with 2.6.29.1-vortex86dx kernel

I am trying to test rc servo but looks like the initialization fails.

I have tried the simplest code.

servo.cpp

Code: Select all

#include <stdio>
#include <roboard>

int main(void) {
   if (rcservo_Initialize(RCSERVO_USECHANNEL0)) {
      printf("Initialized. Channel 0\n");
      rcservo_Close();
   } else {
      printf("Initialization failed\n");
   }

   return 0;
}


(some how, this message board removed the ".h" from my includes. In my actual code, it is <stdio> and <roboard>. I don't get any error message while compiling or linking.>


$ gcc -c servo.cpp -I./libsrc
$ gcc -o servo servo.o -L. -lRBIO -lstc++
$ ./servo
Initialization failed

I tried different channels and but all of them do not work. I have also tried all the possible bios settings...

Any help would be greatly appreciated.

[crane]

I also measured the voltage at the 'vcc' pin of the servo pin, and it read exactly same as the power supply voltage. In my case, I was using 12V. Is this normal?

[roboard]

Please ensure you log in as a root that can run RoBoIO and try again.

[crane]

Thank you very much!

Using sudo, I was able to initialize the servo. I did not have enough time to test the RoBoIO this morning. I will do more test when I get home this afternoon. By the way, was this root privilege requirement documented somewhere?

One more question. To use the servo, should I use 6V power supply?

[roboard]

HI
1.Yes,you can run all RoBoIO functions as a root.
2.That is normal about the same voltage.Because the power line on RoBoard is connected to servo 'Vxx' pin.
3.The voltage of power supply should be based on the required voltage of servo that you used.If it is 6V,then the voltage of power supply is 6V.(NOTE:Do not exceed the voltage range of RoBoard.)