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Problems reading a digital input for portb.5

 
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sonny



Joined: 14 Sep 2015
Posts: 7

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Problems reading a digital input for portb.5
PostPosted: Tue Sep 22, 2015 12:36 pm     Reply with quote
Hello, new to CCS and PIC, I have a PIC18F45J50 and I'm trying to read a digital input, how the circuit is construct if there's a signal (which is a 12v) goes trough a LDO and gets to 3.3 to the micro which is what I'm trying to read.

Here's what I have
Code:

if(INPUT(PIN_B5) == 1)  // CCS says statement always false
{
    output_high(LED0);  // LED
}

output_high(LED1);  // LED

very simple all I'm trying to do is read the input,

help thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Sep 22, 2015 3:15 pm     Reply with quote
I made your code snippet into a test program and compiled it with CCS
compiler vs. 5.049. I don't get any errors or warnings. It compiles OK.
Code:
#include <18F45J50.h>
#fuses HS, NOWDT
#use delay(clock=20M)
#use rs232(baud=9600, UART1, ERRORS)

#define LED0  PIN_B0
#define LED1  PIN_B1

//===========================
void main()
{

if(input(PIN_B5) == 1)   
  {
   output_high(LED0);   
  }

output_high(LED1);   
 


while(TRUE);
}
sonny



Joined: 14 Sep 2015
Posts: 7

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PostPosted: Wed Sep 23, 2015 7:50 am     Reply with quote
is working now, I had the pullups on
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