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Enable RC4 and RC5 in 18f2550

 
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kiewic



Joined: 24 Apr 2010
Posts: 10

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Enable RC4 and RC5 in 18f2550
PostPosted: Sat Apr 24, 2010 11:45 am     Reply with quote
The data sheet says pins RC4 and RC5 are disable when USB module or on-chip transceiver are enabled. How can I enabled them to use as input?

Thanks.
kiewic



Joined: 24 Apr 2010
Posts: 10

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PostPosted: Sat Apr 24, 2010 1:00 pm     Reply with quote
No idea? It must be the same way with 18f2455, 18f4455, 18f4550.

I'm trying this:

Code:
      if (input(PIN_C4)) { // Get input state
         output_b(255);
      }


But it doesn't get into the if statement.

Do I need to disable the USB characteristic?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Apr 24, 2010 1:42 pm     Reply with quote
See this link:
http://www.ccsinfo.com/forum/viewtopic.php?t=40371
kiewic



Joined: 24 Apr 2010
Posts: 10

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PostPosted: Sat Apr 24, 2010 4:12 pm     Reply with quote
Excellent! I have enable the input on C4 and C5 ports.

Code:

// disable USB module
#byte UCON = 0xF6D
#bit USBEN = UCON.3

// disable on-chip USB transceiver
#byte UCFG = 0xF6F
#bit USBTRANS = UCFG.3

void main()
{
   // ...

   USBEN = 0;
   USBTRANS = 1;

   while (1) {
      if (!input(PIN_C4)) { // Get input state
         output_c(255);
      }
      else {
         output_c(0);
      }
      delay_ms(100);
   }

}


Thank you PCM programmer.
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