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oxxyfx
Joined: 24 May 2007
Posts: 97
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| Define PIC pins into an array - is this possible |
 Posted: Sat Sep 25, 2010 10:56 am |
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Hello,
Since I am not really a C programmer, I just write PIC codes in my free time, I am perhaps missing a lot of basics.
I would like to define 12 pins on a PIC processor in an array so later in the code I can refer to each by their respective order in the array.
Normally I would do a:
| Code: |
#define Ch1 PIN_B1
#define Ch2 PIN_A2
#define Ch3 PIN_B3
#define Ch4 PIN_C4
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etc. The above is just an example, the Chx would be a mixed set of pins.
Now I would like to refer to these later in the code through a single cycle of FOR or WHILE and for that I would need something like this:
| Code: |
For ....{
Output_high(Ch[i]);
delay_ms(10);
Output_low(Ch[i]);
}
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where i goes from 1 to 12.
Is there a way to achieve this?
Thanks in advance. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Sat Sep 25, 2010 2:24 pm |
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Yes.
The later compiler (the last couple of years now), support the use of a variable for pins. There is though a big 'caveat'. Though in coding terms, 'pretty', this makes the I/O functions larger, and slower. You will almost certainly find that a 'generic' version, using an array for pin names, will be something like perhaps 6 times the size of a single 'fixed pin' version. You have both the extra functions to allow each pin operation to use a variable, and the array accesses themselves. You 'pays your money' on this.
As to 'how', declare the array to hold int16 values (pins are coded like this), so:
| Code: |
int16 pins[] = {PIN_B1,PIN_A2,PIN_B3,PIN_C4};
output_high(pins[n]);
//etc...
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If you want the fast version, then used fixed pin names, with a switch statement instead.
Best Wishes |
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