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delay function problem on 18F452

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filjoa

Joined: 04 May 2008
Posts: 260

delay function problem on 18F452

Posted: Wed May 05, 2010 9:17 am

Reply with quote

hi

Today I try make this simple program with an 18F452 at 20Mhz, but when I write delay_ms(1000) comand my led flash quickly and not with +- 1sec.

Have any problem on 18F452 library?

Code:

#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP,BROWNOUT,STVREN
#use delay(clock=20000000)
#use rs232(baud=115200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

#build(reset=0x200)
#build(interrupt=0x208)
#org 0x0000,0x01ff
void bootloader() {
#asm
nop
#endasm
} // Reserve space for the bootloader

void main(void)
{

while(TRUE)
{
output_high(PIN_B7);
delay_ms(1000);
output_low(PIN_B7);
delay_ms(1000);
}
}

Best regards

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Wed May 05, 2010 11:28 am

The typical reason for this problem is that your bootloader core program was programmed for one frequency, and your application program is set for a different frequency.

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