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PIC 18F4550 PORTB I/O Problem

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bhaskarc91

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Hello.
I am using a PIC18F4550 and Hi-Tech C to write a simple LED blinking program on all PORTB pins. However, there is neither a high nor a low on any of the pins.
Here is my code:
Code: 
#include<htc.h>
#include<pic18f4550.h>

#define _XTAL_FREQ 20000000

__CONFIG(1,PLLDIV_1 & CPUDIV_OSC1_PLL2 & USBDIV_1 & FOSC_HS);
__CONFIG(2,PWRT_ON & BOR_OFF & WDT_OFF);
__CONFIG(3,MCLRE_ON & PBADEN_OFF);


void main() {
    TRISB = 0x00;

    while (1) {
        PORTB = 0xff;
    }
}
Please help.
 

Please refer to the datasheet. There are other registers that may need to be set.

---------- Post added at 11:20 ---------- Previous post was at 11:14 ----------
bhaskarc91 said:
Hello.
I am using a PIC18F4550 and Hi-Tech C to write a simple LED blinking program on all PORTB pins. However, there is neither a high nor a low on any of the pins.
Here is my code:
Code: 
#include<htc.h>
#include<pic18f4550.h>

#define _XTAL_FREQ 20000000

__CONFIG(1,PLLDIV_1 & CPUDIV_OSC1_PLL2 & USBDIV_1 & FOSC_HS);
__CONFIG(2,PWRT_ON & BOR_OFF & WDT_OFF);
__CONFIG(3,MCLRE_ON & PBADEN_OFF);


void main() {
    TRISB = 0x00;

    while (1) {
        PORTB = 0xff;
    }
}
Please help.
Click to expand...

You are setting :

while (1) {
PORTB = 0xff;
}


how do you expect the PORTB to blink as its always set to 0xFF?

---------- Post added at 11:22 ---------- Previous post was at 11:20 ----------

You need to do something like this:


Code: 
while(1){

PORTB = 0xFF;
DelayMs(10);
PORTB = 0x00;
}

and remember to include <delay.h> from the compiler folder
 

or even

while(1){

PORTB = 0xFF;
DelayMs(250);
PORTB = 0x00;
DelayMs(250);
}
 

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