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what wrong

 
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EE
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what wrong
PostPosted: Fri May 22, 2009 11:47 am     Reply with quote
Code:
#include <18F4550.h>
#fuses HS,NOWDT,NOPUT,NOPROTECT
#use delay(clock=20000000)

#define s1 PIN_B1
#define s2 PIN_B2

void main()
{

while(1)
{
output_low(PIN_D7);

   while(input(s1))
   {
       while(input(s2))
       {
        output_high(PIN_D7);
       }
   }

   while(!input(s2))
   {
   output_low(PIN_D7);
   }
}
}
This is my simple code to test my mcu. This code is waiting for logic high to pin_b1 and pin_b2 . But when I use this code the mcu pin_d7 go to high, but pin_b1 and pin_b2 are logic low. Why ???
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Fri May 22, 2009 1:50 pm     Reply with quote
You are missing to NOLVP fuse - are you sure the PIC is not being help in programming mode?
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Regards, Andrew

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apcaye



Joined: 22 May 2009
Posts: 29
Location: Brazil

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PostPosted: Mon May 25, 2009 2:50 pm     Reply with quote
Have you initialized the TRISB and TRISD registers? They indicate whether a pin is an input or an output. Do you have a pull-up or pull-down resistor connected to pins B1 and B2? If there is nothing connected to these pins, they can assume any value (0 or 1).

Regards,
Adriano.
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