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#fuses

 
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#fuses
PostPosted: Tue Aug 21, 2007 11:58 am     Reply with quote
We just bought the CCS PCWH compiler w/IDE. The problem I am having is that regardless of the #fuses line nothing ever changes in the .hex output file. I am trying to load a program into a PIC18F452/L with an external oscillator (EC_IO) using a BP Microsystems 1200 programmer. This has never been an issue in the past. I created a short test program to flash an LED that's on the PCB but it appears that the CPU will only execute one instruction and then stop. I am sure this is an oscillator problem being caused by the faulty #fuses directive. Is there an updated version of the compiler yet that fixes this? I am running 4.050.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Aug 21, 2007 12:04 pm     Reply with quote
Try the following test program. See if it works. The oscillator fuse
is set for EC_IO. Change the #use delay() statement to match your
oscillator frequency.
Code:

#include <18F452.h>
#fuses EC_IO, NOWDT, PUT, BROWNOUT, NOLVP
#use delay(clock=20000000)
//===========================
void main()
{

while(1)
  {
   output_high(PIN_B0); // LED on
   delay_ms(500);
   output_low(PIN_B0);  // LED off
   delay_ms(500);
  }

}
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