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| 18F252 to 18F2620 upgrade problem |
 Posted: Wed Apr 11, 2007 9:45 am |
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I've been using the 18F252 for a couple of years now but a program I've written is too big to fit into it's ROM so I got hold of a couple of 18F2620s instead. Unfortunately, the code itself seems to work but I can't get anything through the output pin A0. I've tried everything I could think of but it doesn't seem to work, even resorting to the most basic program shown below which works fine on my 18F252 but not the 2620. Is there a new flag or something I need to set to enable the outputs? Help!!!
Thanks
Simon
| Code: | #include <18F2620.h>
#device adc=8
/*#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES HS //High speed Osc (> 4mhz)
#FUSES NOPROTECT //Code not protected from reading
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV21 //Brownout reset at 2.1V
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES MCLR //Master Clear pin enabled*/
#fuses HS, NOWDT, NOPROTECT, NOBROWNOUT
#use delay(clock=8192000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,ERRORS)
void main()
{
/* setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF|ADC_TAD_MUL_0);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_low_volt_detect(FALSE);
setup_oscillator(False);*/
output_float(PIN_A0);
while(1)
{
output_high(PIN_A0);
printf("high\r\n");
delay_ms(5000);
printf("low\r\n");
output_low(pin_A0);
delay_ms(5000);
}
return;
}
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jecottrell
Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ
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| Posted: Wed Apr 11, 2007 10:18 am |
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I'm not sure if I'm reading the default states correctly from the datasheet. But, I think it may default to LVP if not specifically set to NOLVP.
Try adding that fuse and see if it helps...
I've never had problems with the 2620.
John |
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