18F4550 doesn't work but 16F877 do WHY???

[bc_max]

I need to use a PIC18F4550 but I can just work with 16F877 WHY??? I use PIC WIZARD to do my program (and I reduce it do flashing A0). When I use the PIC18F4550 the delay_ms doesn't look to be working. I use a PIC 16F877 with the very same circuit and it works.

I think the option of 18F4550 is not working in the program...

Could anyone help me please ?!?!?

Maxime

[rberek]

Post the relevant code, the compiler and the compiler version. It's hard to help without that info
_________________
The difference between genius and stupidity is that genius has its limits...

[Guest]

PCW C Compiler IDE
version 3.224

and the code for the .c file:
#include "W:\projet\buz16f877.h"
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
while(TRUE)
{
output_high(PIN_A0);
delay_ms(1000);
output_low(PIN_A0);
delay_ms(1000);
}
}

and the code for the .h file :

#include <16F877.h>
#device ICD=TRUE
#device adc=8
#fuses NOWDT,HS, NOPUT, NOPROTECT, BROWNOUT, LVP, NOCPD, NOWRT, NODEBUG
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)

[rberek]

Don't you need the PCWH compiler to compile for the PIC18? You have only listed the PCW compiler.
_________________
The difference between genius and stupidity is that genius has its limits...

[rberek]

Assuming you have the correct compiler, could it be something as simple as forgetting to change the header file to grab the new device?

I mention this because I did exactly that last night. I moved a working program from the 16F877 to the 16F452 and was beating my head against the wall for an hour trying to figure out why it was so dead, and realised I had forgotten to modify the header file to change the device type.
_________________
The difference between genius and stupidity is that genius has its limits...

[PCM programmer]