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18F4550 don't start, why?

 
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Apr 03, 2010 9:59 pm     Reply with quote
Quote:

I use 20MHz crystal.

First try blinking an LED with the PIC running at 20 MHz, as shown in
the program below. Does this work ?
Code:

#include <18F4550.h>
#fuses HS, NOWDT, PUT, BROWNOUT, NOLVP
#use delay(clock=20000000)

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

// Blink an LED on pin B0.
while(1)
  {
   output_high(PIN_B0);   
   delay_ms(500);
   output_low(PIN_B0);
   delay_ms(500);
  }

}


If that works, change the fuses to run in PLL mode:
Code:

#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,USBDIV,PLL5,CPUDIV1
#use delay(clock=48000000)

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

while(1)
  {
   output_high(PIN_B0);
   delay_ms(500);
   output_low(PIN_B0);
   delay_ms(500);
  }

}
rudy



Joined: 27 Apr 2008
Posts: 167

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PostPosted: Sun Apr 04, 2010 5:59 am     Reply with quote
Yes, the problem was the port address, I was calling 0x80 but, in 18F4550 is 0xf80.

works fine now,

regards.
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