What our team is trying to do this year is to select our Autonomous mode by using the joystick buttons or some other type of button mounted on our control box. While searching Chief Delphi forums for possible solutions we have stumbled upon this code:
It’s written by Kevin Watson. We used a slightly modified version of it.
User_Mode_Byte is the user display on the OI. Use that little button to change to it.
AUTON_UP/DOWN are the defines to which a joystick button or something similar.
Now we are stumped as we are unable to make this code work for us. First of all we are unsure in which of the program files should we put this function into. Second of all when we tried simply pasting this code into our user_routines.c or user_routines_fast.c functions the compiler came out with a bunch of errors. Can anyone take a look and maybe guide us to a solution if possible. Thanks in advance!
Put that snippet of code in user_routines.c and call it from the same place you’re reading the joysticks for other purposes. Default_Routine(), perhaps.
Your compiler errors are probably because you didn’t get the hint to replace AUTON_UP and AUTON_DN with the actual OI controls you will be using to step the number up and down. p1_sw_trig and p1_sw_top, for example. You will also have to declare auton_select as a global variable so you can use it in your actual autonomous routine.
Second of all, how would I got about declaring auton_select as a global variable, and third I would need to get around the following errors:
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:661:Error  compatible scalar operands required for comparison
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:663:Error  scalar type expected for increment operator
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:667:Error  type mismatch in assignment
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:670:Error  compatible scalar operands required for comparison
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:672:Error  compatible scalar operands required for comparison
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:674:Error  type mismatch in assignment
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:678:Error  scalar type expected for decrement operator
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:684:Error  symbol ‘User_Mode_Byte’ has not been defined
C:\2007 arm code\FrcCode2005v2.4\user_routines.c:684:Error  lvalue required
The code is from 2005 since we are just testing our prototype arm with the 2005 controller.
You made the name of the function the same as the name of the variable it’s trying to set. That’s what most of your compiler errors are about. You should probably change it back to auton_selector the way it was in the example. You also misspelled User_Mode_byte with a capital B.
To declare a global variable, do it at the top of user_routines.c where it says DEFINE USER VARIABLES AND INITIALIZE THEM HERE.
Oh, and I believe there was a typo in the example code. It looks like the 94 ought to be 99 instead.
Thanks so much for your help so far. We have managed to get the code up and running displaying the numbers on the OI, however anytime I try to get a value from auton_select in my Autonomous Mode I keep getting
C:\2007 arm code\FrcCode2005v2.4\user_routines_fast.c:154:Error  symbol ‘auton_select’ has not been defined
C:\2007 arm code\FrcCode2005v2.4\user_routines_fast.c:154:Warning  call of function without prototype
even though I have defined auton_select in user_routines.c as so
/*** DEFINE USER VARIABLES AND INITIALIZE THEM HERE ***/ #if _USE_CMU_CAMERA #include “user_camera.h”
C:\2007 arm code\FrcCode2005v2.4\user_routines_fast.c:137:Warning  call of function without prototype
Keep getting this warning, is it important or not really?
P.S. - Got it working HOWEVER I still have one more question. When the robot is disabled through the competition port it refuses to change the autonomous mode. Will our team have to change autonomous modes before we come to the player stations.
Either that or you’re calling a function before it is declared. This code will generate the warning
void void main()
From the compiler’s point of view, it doesn’t know that func exists when it parses through main and thus throws the warning.
Here are two ways to get rid of the warning. I prefer the first method.
Create a function prototype either at the top of the C file or in a header included by that C file. This will tell the compiler that a function named func that takes no inputs and returns nothing is defined somewhere in the code.
void func(void); /* Here is the prototype */
Write your function before you call it. In this case, the compiler will parse through the function and know about it by the time it gets to the call.
I highly suggest that you get in the habit of dealing with warnings as they pop up so that they don’t get lost in the shuffle and manifest themselves into a problem.
I like that code that you found and i tried using it in our code but I get a syntax error on the line that says:
I declared the global variable in user_routines.c and put the extern int in the user_routines_fast.c (both are in the correct places). I changed the AUTON_UP and AUTON_DN to buttons on the joystick. I changed the 94 to 99. I also checked the lines before it so see if I left out a ; or } but I did’nt.
I also got another syntax error when I try using auton_select in user_routines_fast.c to select the autonomous.
The RC and OI are always in communication with each other (as long as they are on and the radio link is good). The OI/RC master code determines what information is passed depending on the competition port state (disabled, autonomous, et cetera).
sorry for my lack of knowledge, i’m a rookie, but i don’t get why a team would want to set a button for autonomous mode at all. isn’t it controlled via the competition port and thus out of our hands? in the docs for the OI it says that if you jumper pins 5 and 8, it puts the bot into auto mode. i imagine that’s what they do at the competitions, not have a team member push a button on the controller…