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PIC16HV785 and port_a_pullups problem

 
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Guest
PIC16HV785 and port_a_pullups problem
PostPosted: Mon Apr 21, 2008 6:52 am     Reply with quote
I have switches connected to RA0, RA1, RA2, RA4, and RA5. I would like to use the internal pullups on these pins but cannot seem to get it to function properly. Here is the code:

Code:

void main(void) {
   int32 milliseconds, time_delay;
   setup_oscillator(OSC_8MHZ);  // Setup internal oscillator to 8MHz
   set_tris_a(0b00111111); // Setup TRIS register for port A
   setup_adc_ports(sAN6); // Dial pot is on analog channel 6
   setup_adc(ADC_CLOCK_INTERNAL); // Use normal clock
   set_adc_channel(6); // Set ADC MUX to channel 6
   setup_timer_0(RTCC_INTERNAL | RTCC_DIV_16); // Set up the millisecond timer
   setup_timer_1(T1_INTERNAL | T1_DIV_BY_8);
   port_a_pullups(0b00110100); // Enable pullup resistors on port A
   enable_interrupts(INT_RTCC);
   enable_interrupts(INT_TIMER1);
   enable_interrupts(GLOBAL);
   while(TRUE) {
      if(!input(INT_TMR)) output_high(RELAY); // Turn on relay
      if(input(ON_TMR)) output_low(RELAY); // Turn off relay
     
      switch(0x10) {
         case SEC_1:  time_delay=SEC1_MS;
                      break;
         case SEC_10: time_delay=SEC10_MS;
                      break;
         case MIN_1:  time_delay=MIN1_MS;
                      break;
         case MIN_10: time_delay=MIN10_MS;
                      break;
      }   
     
      if(ms_pulse) { // One millisecond pulse
         ms_pulse=0; // Reset flag
         milliseconds++; // Increment timer
         if(milliseconds>=time_delay) {
            if(!input(INT_TMR)) output_low(RELAY);
            if(input(ON_TMR)) output_high(RELAY);
            while(TRUE);
         }
      }
   }
}
Guest
Update
PostPosted: Mon Apr 21, 2008 11:25 am     Reply with quote
It appears after examining the code deeper that the ANSEL registers need to be manually written to to allow the operation of the port_a_pullups() for this part.
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