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Port A wierdness on 16F884

 
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Port A wierdness on 16F884
PostPosted: Tue Jan 22, 2008 8:12 am     Reply with quote
I have a problem when using port A on a PIC16F884. Reading this port always returns a zero. I use a relay on the board to indicate the state. The input to port A is a 6 position DIP switch and a 3 position toggle switch. The toggle is on A0,A1 and the DIP switch is on the rest. They are all pulled up to +5V with 10k resistors. Any help would be greatly appreciated.

I have the PUMP_MODE, SPLX_DPLX, etc #define'd to individual port A pins in the following code.

Code:

   set_tris_a(0b11111111);
   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_oscillator(OSC_8MHZ);
   setup_timer_0(RTCC_INTERNAL);
   //enable_interrupts(GLOBAL);
   //enable_interrupts(int_timer0);
   //print_display(123456);
   while(TRUE) {
// DIP switch routines *********************************************************
      if(!input(SPLX_DPLX)) duplex=1; else duplex=0; // Simplex/duplex operation
      if(!input(PUMP_MODE)) { // Pump up/pump down mode selection
         off_float=input(OFF_FLT);
         lead_float=input(LEAD_FLT);
         lag_float=input(LAG_FLT);
         output_high(PUMP1);
      } else {
         off_float=!input(OFF_FLT);
         lead_float=!input(LEAD_FLT);
         lag_float=!input(LAG_FLT);
         output_low(PUMP1);
      }
      if(!input(START_PUMP)) pump_order=1; else pump_order=0; // Pump ordering
      if(!input(ALTERNATION)) alternate=1; else alternate=0; // Pump alternation
// *****************************************************************************
Guest
PostPosted: Tue Jan 22, 2008 8:26 am     Reply with quote
It looks like answered my own question. I had to clear the ANSEL register (0x188) since it appears that the ADC setup functions of CCS neglect to do so.
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