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18F2550 porta problem

 
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bdrmachine



Joined: 24 Jan 2010
Posts: 14

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18F2550 porta problem
PostPosted: Sun Jan 23, 2011 9:14 am     Reply with quote
I am having a problem understanding why my 18F2550 processor will not change port A pin states properly. PIN_A4 will not change using output_low(PIN_A4) or output_bit(PIN_A4, 0). The same is true if I try to set them high. Looking at the watch window in mplab (PORTA) I see the PIN_A1 bit change instead. Here are my setup statements :
Code:

 setup_port_a( AN0_ANALOG );
  setup_adc( ADC_CLOCK_INTERNAL );   
  setup_spi(SPI_SS_DISABLED);
  setup_timer_1(T1_DISABLED);
  setup_timer_2(T2_DISABLED,0,1);
  setup_comparator(NC_NC_NC_NC);
  setup_vref(FALSE);

  set_tris_e(0x0f);
  set_tris_a(0x0f);

What have I missed?

Thanks Much
Brian
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jan 23, 2011 3:36 pm     Reply with quote
Make a simple program that only toggles Pin A4, and it should work.
Example:
Code:

#include <18F2550.h>
#fuses HS, NOWDT,BROWNOUT, PUT, NOLVP, CPUDIV1
#use delay(clock=20000000)
//======================================
void main(void)
{

while(1)
  {
   output_high(PIN_A4);
   delay_ms(500);
   output_low(PIN_A4);
   delay_ms(500);
  }

}
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