On 4/2/2012 7:08 PM, Sergey Dryga wrote:
> eMyListsDDg<emylistsddg<at>  gmail.com>  writes:
>
>>
>> new to using hi-tech c and would like to know which is preferred way to =
define
> a pin for use.
>>
>> one can use TRIS, PORT or LAT bits to define a pin to put a LED on, yes?
>>
>> does one use one of the above or is it as simple as this?
>>
>>     #define LED1 RA0
>>
>> i'm a bit unsure which of the SFRs such as listed above that one would u=
se.
> i'm using 16f88
>>
> Yes, it is that simple.
> Make sure that you set corresponding TRIS bit to output, in your case:
> TRISA =3D 0bxxxxxxx0;
>
> where x - 0 or 1
>
> for simple use no need to do anything else.  You should #include<htc.h>  =
file,
> it defines all different SFRs for the processor you use.
>
> Sergey Dryga
> http://beaglerobotics.com

So, it's not that simple, since you also need to set the tris bit to the=20
right state.  Which could involve another macro statement, like:
#define LED1_TRIS_BIT SomeTrisBitUnion.SomeTrisBit  And maybe another=20
level of macro like #define ENABLE_LED (some code)

It is good to know that rather than set the whole tris reg, in the case=20
where some other code has already set it up, you can just (re)set the=20
individual bit with a bit instruction or a bitwise AND or OR.

Joe W


--=20
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