I'm just learning how to program using PicKit3 and Microchip's C18. I'm trying to read a byte of data on the C port of a PIC18f45k20, but I'm not getting the byte I'm inputting to the port. Can someone tell me what I'm doing wrong? Here's my code: (I used number2 just to set a break-point; it has no useful function).


/** C O N F I G U R A T I O N B I T S ******************************/

#pragma config FOSC = INTIO67, FCMEN = OFF, IESO = OFF // CONFIG1H
#pragma config PWRT = OFF, BOREN = SBORDIS, BORV = 30 // CONFIG2L
#pragma config WDTEN = OFF, WDTPS = 32768 // CONFIG2H
#pragma config MCLRE = OFF, LPT1OSC = OFF, PBADEN = ON, CCP2MX = PORTC // CONFIG3H
#pragma config STVREN = ON, LVP = OFF, XINST = OFF // CONFIG4L
#pragma config CP0 = OFF, CP1 = OFF, CP2 = OFF, CP3 = OFF // CONFIG5L
#pragma config CPB = OFF, CPD = OFF // CONFIG5H
#pragma config WRT0 = OFF, WRT1 = OFF, WRT2 = OFF, WRT3 = OFF // CONFIG6L
#pragma config WRTB = OFF, WRTC = OFF, WRTD = OFF // CONFIG6H
#pragma config EBTR0 = OFF, EBTR1 = OFF, EBTR2 = OFF, EBTR3 = OFF // CONFIG7L
#pragma config EBTRB = OFF // CONFIG7H


/** I N C L U D E S **************************************************/
#include "p18f46k20.h"
// include files go here....

/** V A R I A B L E S *************************************************/
#pragma udata // declare statically allocated uninitialized variables
unsigned char number, number2;

/** D E C L A R A T I O N S *******************************************/

#pragma code // declare executable instructions
void main (void)
{
TRISC = 0B11111111; // Port C is input
number = 0;
number = LATC;
number2 = 3;

while (1)
;
}

 

I think LATC is for output only, you need to read PORTC.

 

The LATx register is readable too, however, the compiler might not support that function.

 

If you have the PIC18f45k20 then you might have the demo board and lessons. Take a look at lesson 4.

 

You're right, Mark. Thank you very much! I got up this morning and, after reading your post, changed LATC to PORTC and experimentally proved it was reading the input correctly. I can now read and write data to a breadboard! My goal is to make an EEPROM programmer. The next step is to configure a single port with various inputs and outputs. Thanks again!