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Referencing I/O Pins.

 
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bsodmike



Joined: 05 Aug 2006
Posts: 52

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Referencing I/O Pins.
PostPosted: Thu Sep 28, 2006 3:51 am     Reply with quote
Hi,

According to,
http://www.phanderson.com/PIC/PICC/CCS_PCM/tmr0.html

Even though that's very old it seems at CCS at a time supported referencing pins as

Quote:
#define LED_FL_PIN rb3 // RB3
#define SPKR_PIN rb2

#define LED_FL_DIR trisb3
#define SPKR_DIR trisb2


and performing,

Quote:
SPKR_DIR = 0; // make SPKR and LED_FL outputs
LED_FL_DIR = 0;

LED_FL_PIN = 0;
SPKR_PIN = 0;


In my current code I'm using something along the lines of,

#define xPin PORTB.0
#define xTris TRISB.0

while defining

#define PORTA 0x05
etc etc

and that works. However, 'xPin=0;' doesn't work and I'm forced to use output_low(xPin);

Any ideas on this?
bsodmike



Joined: 05 Aug 2006
Posts: 52

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PostPosted: Thu Sep 28, 2006 5:18 am     Reply with quote
I've noticed another problem.

Even defining,

#define xPin PORTB.0

and

output_low(xPin); //doesn't work!

However, '#define xPin PIN_B0' causes it to work, as in the headerfile these are defined in the 'register*8+pin' format (so in this case 6*8+0, as 0x06 is the PORTB register.

Some googling and I found Phanderson's definitions for the 16f84,

Code:
// DEFS_F84.H (CCS PCM)
//
// Definitions of file registers and bits.
//
// PIC16F84.  These agree with Microchip.
//
// Note that bits are lower case for C, upper case for assembly.
//
// copyright Peter H. Anderson, Scotland Co, NC, Mar, '99

// register definitions
#define W 0
#define F 1

// register files
#byte INDF          =0x00
#byte TMR0          =0x01
#byte PCL           =0x02
#byte STATUS        =0x03
#byte FSR           =0x04
#byte PORTA         =0x05
#byte PORTB         =0x06
#byte EEDATA        =0x08
#byte EEADR         =0x09
#byte PCLATH        =0x0a
#byte INTCON        =0x0b

#byte OPTION_REG    =0x81
#byte TRISA         =0x85
#byte TRISB         =0x86
#byte EECON1        =0x88
#byte EECON2        =0x89

#bit ra4   =0x05.4
#bit ra3   =0x05.3
#bit ra2   =0x05.2
#bit ra1   =0x05.1
#bit ra0   =0x05.0

#bit rb7   =0x06.7
#bit rb6   =0x06.6
#bit rb5   =0x06.5
#bit rb4   =0x06.4
#bit rb3   =0x06.3
#bit rb2   =0x06.2
#bit rb1   =0x06.1
#bit rb0   =0x06.0

#bit trisa4   =0x85.4
#bit trisa3   =0x85.3
#bit trisa2   =0x85.2
#bit trisa1   =0x85.1
#bit trisa0   =0x85.0

#bit trisb7   =0x86.7
#bit trisb6   =0x86.6
#bit trisb5   =0x86.5
#bit trisb4   =0x86.4
#bit trisb3   =0x86.3
#bit trisb2   =0x86.2
#bit trisb1   =0x86.1
#bit trisb0   =0x86.0


/me slaps head! #bit/#byte, maybe these'll help, will test in a bit.

Update: Works now, it was the #bit/#byte that sorted it out...

Thanks!
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