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Unread 13-12-2007, 21:25
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Re: How to manipulate a variable value using an array?

The problem is what MPLAB says it is, you cannot reference (aka have a pointer to) a bitfield, relay outputs and, I assume, joystick switch states are stored in bitfields.
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Unread 13-12-2007, 21:28
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Re: How to manipulate a variable value using an array?

I know they are defined in ifi_aliases.h with the #define. So how do I get them out of bitfields? Do i need to "redeclare" them as ints?
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Unread 13-12-2007, 21:44
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Re: How to manipulate a variable value using an array?

When I was trying to write a generalized, modular library for FRC robots (something like WPIlib, but not as high level), I ran into this same issue, but with relay outputs. My solution was to use a structure for storing the values then, at the end of the program loop, call a function that assigned the values in the structure to the actual relays. I think you could do something similar in your case; for example, you could just assign the values of the switches to the various variables in your array at the beginning of every program cycle.
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Unread 13-12-2007, 22:54
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Re: How to manipulate a variable value using an array?

Quote:
Originally Posted by amateurrobotguy View Post
I know they are defined in ifi_aliases.h with the #define. So how do I get them out of bitfields? Do i need to "redeclare" them as ints?
I don't think you can redefine them to an INT since it's using a structure.
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Unread 13-12-2007, 23:29
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Re: How to manipulate a variable value using an array?

Quote:
Originally Posted by amateurrobotguy View Post
cannot reference the address of a bitfield
Each of these names refers to a single bit, not a byte. Because each symbol is referring to a bit and not a byte, an address is insufficient to identify the symbol. The wikipedia article http://en.wikipedia.org/wiki/Bitfield explains the concept very well.

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Originally Posted by amateurrobotguy
So how do I get them out of bitfields?
You must look to where the bit field is defined, and manipulate the struct. However, that seems somewhat counter to what you are attempting.

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Unread 14-12-2007, 00:17
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Re: How to manipulate a variable value using an array?

So much for elegant coding...

But i think lukevanoort's workaround will work, just as long as I put it all in a separate function. My goal with this was just to clean up a billion if-thens into a for loop but i guess a if-then function will make the code easier to read anyways.
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Last edited by amateurrobotguy : 14-12-2007 at 00:23.
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