Identifier redefined at PIC18F2520

lindodv · Jul 21, 2014

Hi all, can you help me solving this problem?
this code is working with PIC16F877A but is not working with PIC18F2520.

Code:

sbit SDA at RC4_bit;
sbit SCL at RC3_bit;
sbit SDA_Direction at TRISC4_bit;
sbit SCL_Direction at TRISC3_bit;

void main() {

   SDA_Direction=0;
   SCL_Direction=0;
   do{
   SDA = 1;
   SCL = 0;
   delay_ms(2000);
   SDA = 0;
   SCL = 1;

  } while(1);

}

0 121 Compilation Started PIC18F2520.c
1 392 'SDA' Identifier redefined PIC18F2520.c
2 401 ; expected, but 'at' found PIC18F2520.c
2 392 'SCL' Identifier redefined PIC18F2520.c
2 370 Specifier needed PIC18F2520.c
2 395 Invalid declarator expected'(' or identifier PIC18F2520.c
3 401 ; expected, but 'at' found PIC18F2520.c
3 370 Specifier needed PIC18F2520.c
3 395 Invalid declarator expected'(' or identifier PIC18F2520.c
3 392 '' Identifier redefined PIC18F2520.c
4 401 ; expected, but 'at' found PIC18F2520.c
4 370 Specifier needed PIC18F2520.c
4 395 Invalid declarator expected'(' or identifier PIC18F2520.c
4 392 '' Identifier redefined PIC18F2520.c
4 312 Internal error '' PIC18F2520.c
0 102 Finished (with errors): 18 Jul 2014, 20:00:20 PIC18F2520.mcppi

embpic · Jul 21, 2014

where is header file??
which compiler u r using.

paulfjujo · Jul 21, 2014

hello,

if you have included I2C library..
you don't have to redefine SDA SCL ... for I2C
I2C library allready define this bits...

I²C1 module is initialized on the RC3 and RC4 pin (SCL and SDA, respectively).

see your 18F25K20.c file
maybe here :

"C:\Program Files\Mikroelektronika\mikroC PRO for PIC\Defs\P18F25K20.c

be carrefull...

Code:

  // Alternative bit function
    const register unsigned short int SCL = 3;
    sbit  SCL_bit at PORTC.B3;


    // Alternative bit function
    const register unsigned short int SDA = 4;
    sbit  SDA_bit at PORTC.B4;

lindodv · Jul 22, 2014

thanks guys, I'm using mikroc for PIC.
this nether code is not working:what's the problem!

Code:

void main() {

   TRISC.B4=0;
   TRISC.B3=0;

   do{
   PORTC.B4 = 1;
   PORTC.B3 = 0;
   delay_ms(2000);
   PORTC.B4 =0;
   PORTC.B3 =1;

  } while(1);

}

in the simulator, LEDs are not blinking.

paulfjujo · Jul 22, 2014

hello,

the rule is : with PIC18F use LAT instead PORT for output..
and it is better to add a delay to see the change

Code:

void main() {

   TRISC.B4=0;
   TRISC.B3=0;

   do{
   LATC.B4 = 1;
   LATC.B3 = 0;
   delay_ms(2000);
   LATC.B4 =0;
   LATC.B3 =1;
 [B][COLOR=#0000ff] delay_ms(2000);[/COLOR][/B]  


  } while(1);
}

lindodv · Jul 22, 2014

oh my....I can see my stupid mistake here.(delay_ms)thanks.
I could solve my previous problem with this code:

Code:

sbit SSDA at RC4_bit;
sbit SSCL at RC3_bit;
sbit SSDA_Direction at TRISC4_bit;
sbit SSCL_Direction at TRISC3_bit;

void main() {


   SSDA_Direction=0;
   SSCL_Direction=0;
   do{
   SSDA = 1;
   SSCL = 0;
   delay_ms(2000);
   SSDA = 0;
   SSCL = 1;
   delay_ms(2000);
  } while(1);

}

but it's a Trick.when I disabled I2C Library the error did not disappear (Identifier redefined), so I used the Trick. Do you have any simply example with PIC18F for I2C communication(Compatible with Mikroc PIC)?

Identifier redefined at PIC18F2520

lindodv

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embpic

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paulfjujo

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Identifier redefined at PIC18F2520

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