Post by thread:[PIC] PIC16F877A PortD ?

Are there analog input options on those pins? I think I remember some parts having analog on PORTD, but that could just be my imagination... Mike H. On 4/18/06, Bob Axtell <spam_OUTengineerTakeThisOuTcotse.net> wrote: > This is embarassing. I have used this part in the past and > never had a problem with portD, but I have 4 PCBs showing > that PortD, with pins set as inputs, never seems to pass data > into w. I know that portD uses the "Parallel Port" feature, but > I think I have turned it off. > > I guess I am missing something. . Any ideas? > > --Bob > -

This setup uses portd as a bi-directional 8 bit bus check it against your initialisation I know it works (in my app)the A-D is set for part and part but port D is all digital Rgds Steve ;----------------------- INITALISATION ROUTIENE------------------------------- bcf STATUS,RP0 ; first do page 0 stuff. yep, page 0 Gie_off ; turn off int and test its off clrf STATUS ; force bank zero clrf INTCON ; disable ints ect clrf PIR1 ; clear all flag bits PORT_SETUP clrf PORTA clrf PORTB movlw b'00100000' ; OE off on outputs movwf PORTC clrf PORTD clrf PORTE BANK1 movlw b'00111111' ; IO for port movwf TRISA movlw b'11111111' movwf TRISB movlw b'11011000' movwf TRISC movlw b'11111111' movfw TRISD clrf TRISE WDT_SETUP movlw B'00001111' ; SET WDT TIMER TIMEOUT PULLUP Off movwf OPTION_REG ADCON_SETUP movlw B'11000011' ; LITERAL FOR ADCON1 movwf ADCON1 ; LOAD ADCON1 INT_SETUP movlw B'01000001' ; SET UP TMR1 FOR OVERFLOW and ADIE movwf PIE1 BANK0 ; RETURN TO BANK_0 movlw B'11000000' ; INTERRUPT CONTROL ENABLE GIE AND PIE1 movwf INTCON ; ENABLE INT'S {Original Message removed}

No, I have ADCON1 set properly... Mike Hord wrote: > Are there analog input options on those pins? I think I > remember some parts having analog on PORTD, but that > could just be my imagination... > > Mike H. > > On 4/18/06, Bob Axtell <.....engineerKILLspam@spam@cotse.net> wrote: > >> This is embarassing. I have used this part in the past and >> never had a problem with portD, but I have 4 PCBs showing >> that PortD, with pins set as inputs, never seems to pass data >> into w. I know that portD uses the "Parallel Port" feature, but >> I think I have turned it off. >> >> I guess I am missing something. . Any ideas? >> >> --Bob >> --

Do I need a movfw TRISD ? I have a MOVWF TRISD, course it isn't working.. - - - BTW, ICD2 is showing TRISD as having a value of 00, whereas I loaded it with 0F.. go figure. LOOKS like I am overwriting it someplace. --Bob Steve Smith wrote: {Quote hidden}> This setup uses portd as a bi-directional 8 bit bus check it against your > initialisation I know it works (in my app)the A-D is set for part and part > but port D is all digital > > Rgds > Steve > ;----------------------- INITALISATION > ROUTIENE------------------------------- > bcf STATUS,RP0 ; first do page 0 stuff. > yep, page 0 > Gie_off ; turn off > int and test its off > clrf STATUS ; force bank zero > clrf INTCON ; disable ints ect > clrf PIR1 ; clear all flag bits > PORT_SETUP > clrf PORTA > clrf PORTB > movlw b'00100000' ; OE off on outputs > > movwf PORTC > clrf PORTD > clrf PORTE > BANK1 > movlw b'00111111' ; IO for port > movwf TRISA > movlw b'11111111' > movwf TRISB > movlw b'11011000' > movwf TRISC > movlw b'11111111' > movfw TRISD > clrf TRISE > WDT_SETUP > movlw B'00001111' ; SET WDT TIMER TIMEOUT > PULLUP Off > movwf OPTION_REG > ADCON_SETUP > movlw B'11000011' ; LITERAL FOR ADCON1 > movwf ADCON1 ; LOAD ADCON1 > INT_SETUP > movlw B'01000001' ; SET UP TMR1 FOR OVERFLOW > and ADIE > movwf PIE1 > BANK0 ; RETURN TO BANK_0 > movlw B'11000000' ; INTERRUPT CONTROL ENABLE GIE AND > PIE1 > movwf INTCON ; ENABLE INT'S > > > {Original Message removed}

you have to set RP0 bit in the STATUS register to write to the TRISD register. then reset it wheen youre done. regards, jim {Quote hidden}> Do I need a movfw TRISD ? I have a MOVWF TRISD, course it isn't > working.. - - - > > BTW, ICD2 is showing TRISD as having a value of 00, whereas I loaded it > with 0F.. go figure. > LOOKS like I am overwriting it someplace. > > --Bob > > Steve Smith wrote: >> This setup uses portd as a bi-directional 8 bit bus check it against >> your initialisation I know it works (in my app)the A-D is set for part >> and part but port D is all digital >> >> Rgds >> Steve >> ;----------------------- INITALISATION >> ROUTIENE------------------------------- >> bcf STATUS,RP0 ; first do page 0 stuff. >> yep, page 0 >> Gie_off ; turn off >> int and test its off >> clrf STATUS ; force bank zero >> clrf INTCON ; disable ints ect >> clrf PIR1 ; clear all flag bits >> PORT_SETUP >> clrf PORTA >> clrf PORTB >> movlw b'00100000' ; OE off on outputs >> >> movwf PORTC >> clrf PORTD >> clrf PORTE >> BANK1 >> movlw b'00111111' ; IO for port >> movwf TRISA >> movlw b'11111111' >> movwf TRISB >> movlw b'11011000' >> movwf TRISC >> movlw b'11111111' >> movfw TRISD >> clrf TRISE >> WDT_SETUP >> movlw B'00001111' ; SET WDT TIMER TIMEOUT >> PULLUP Off >> movwf OPTION_REG >> ADCON_SETUP >> movlw B'11000011' ; LITERAL FOR ADCON1 >> movwf ADCON1 ; LOAD ADCON1 >> INT_SETUP >> movlw B'01000001' ; SET UP TMR1 FOR OVERFLOW >> and ADIE >> movwf PIE1 >> BANK0 ; RETURN TO BANK_0 >> movlw B'11000000' ; INTERRUPT CONTROL ENABLE GIE AND >> PIE1 >> movwf INTCON ; ENABLE INT'S >> >> >> {Original Message removed}

Thanks steve. Exactly like mine. --Bob Steve Smith wrote: {Quote hidden}> This setup uses portd as a bi-directional 8 bit bus check it against your > initialisation I know it works (in my app)the A-D is set for part and part > but port D is all digital > > Rgds > Steve > ;----------------------- INITALISATION > ROUTIENE------------------------------- > bcf STATUS,RP0 ; first do page 0 stuff. > yep, page 0 > Gie_off ; turn off > int and test its off > clrf STATUS ; force bank zero > clrf INTCON ; disable ints ect > clrf PIR1 ; clear all flag bits > PORT_SETUP > clrf PORTA > clrf PORTB > movlw b'00100000' ; OE off on outputs > > movwf PORTC > clrf PORTD > clrf PORTE > BANK1 > movlw b'00111111' ; IO for port > movwf TRISA > movlw b'11111111' > movwf TRISB > movlw b'11011000' > movwf TRISC > movlw b'11111111' > movfw TRISD > clrf TRISE > WDT_SETUP > movlw B'00001111' ; SET WDT TIMER TIMEOUT > PULLUP Off > movwf OPTION_REG > ADCON_SETUP > movlw B'11000011' ; LITERAL FOR ADCON1 > movwf ADCON1 ; LOAD ADCON1 > INT_SETUP > movlw B'01000001' ; SET UP TMR1 FOR OVERFLOW > and ADIE > movwf PIE1 > BANK0 ; RETURN TO BANK_0 > movlw B'11000000' ; INTERRUPT CONTROL ENABLE GIE AND > PIE1 > movwf INTCON ; ENABLE INT'S > > > {Original Message removed}

Its fixed, I was overwriting it in a routine via indirect. --Bob Paul James E. wrote: {Quote hidden}> you have to set RP0 bit in the STATUS register to write to the TRISD > register. then reset it wheen youre done. > > regards, > > jim > > > > > >> Do I need a movfw TRISD ? I have a MOVWF TRISD, course it isn't >> working.. - - - >> >> BTW, ICD2 is showing TRISD as having a value of 00, whereas I loaded it >> with 0F.. go figure. >> LOOKS like I am overwriting it someplace. >> >> --Bob >> >> Steve Smith wrote: >> >>> This setup uses portd as a bi-directional 8 bit bus check it against >>> your initialisation I know it works (in my app)the A-D is set for part >>> and part but port D is all digital >>> >>> Rgds >>> Steve >>> ;----------------------- INITALISATION >>> ROUTIENE------------------------------- >>> bcf STATUS,RP0 ; first do page 0 stuff. >>> yep, page 0 >>> Gie_off ; turn off >>> int and test its off >>> clrf STATUS ; force bank zero >>> clrf INTCON ; disable ints ect >>> clrf PIR1 ; clear all flag bits >>> PORT_SETUP >>> clrf PORTA >>> clrf PORTB >>> movlw b'00100000' ; OE off on outputs >>> >>> movwf PORTC >>> clrf PORTD >>> clrf PORTE >>> BANK1 >>> movlw b'00111111' ; IO for port >>> movwf TRISA >>> movlw b'11111111' >>> movwf TRISB >>> movlw b'11011000' >>> movwf TRISC >>> movlw b'11111111' >>> movfw TRISD >>> clrf TRISE >>> WDT_SETUP >>> movlw B'00001111' ; SET WDT TIMER TIMEOUT >>> PULLUP Off >>> movwf OPTION_REG >>> ADCON_SETUP >>> movlw B'11000011' ; LITERAL FOR ADCON1 >>> movwf ADCON1 ; LOAD ADCON1 >>> INT_SETUP >>> movlw B'01000001' ; SET UP TMR1 FOR OVERFLOW >>> and ADIE >>> movwf PIE1 >>> BANK0 ; RETURN TO BANK_0 >>> movlw B'11000000' ; INTERRUPT CONTROL ENABLE GIE AND >>> PIE1 >>> movwf INTCON ; ENABLE INT'S >>> >>> >>> {Original Message removed}

Typo copied and bastardised should be movwf.. Are you in the correct bank?? Steve -----Original Message----- From: piclist-bouncesKILLspammit.edu [.....piclist-bouncesKILLspam.....mit.edu] On Behalf Of Bob Axtell Sent: 18 April 2006 18:26 To: Microcontroller discussion list - Public. Subject: Re: [PIC] PIC16F877A PortD ? Do I need a movfw TRISD ? I have a MOVWF TRISD, course it isn't working.. - - - BTW, ICD2 is showing TRISD as having a value of 00, whereas I loaded it with 0F.. go figure. LOOKS like I am overwriting it someplace. --Bob Steve Smith wrote: {Quote hidden}> This setup uses portd as a bi-directional 8 bit bus check it against your > initialisation I know it works (in my app)the A-D is set for part and part > but port D is all digital > > Rgds > Steve > ;----------------------- INITALISATION > ROUTIENE------------------------------- > bcf STATUS,RP0 ; first do page 0 stuff. > yep, page 0 > Gie_off ; turn off > int and test its off > clrf STATUS ; force bank zero > clrf INTCON ; disable ints ect > clrf PIR1 ; clear all flag bits > PORT_SETUP > clrf PORTA > clrf PORTB > movlw b'00100000' ; OE off on outputs > > movwf PORTC > clrf PORTD > clrf PORTE > BANK1 > movlw b'00111111' ; IO for port > movwf TRISA > movlw b'11111111' > movwf TRISB > movlw b'11011000' > movwf TRISC > movlw b'11111111' > movfw TRISD > clrf TRISE > WDT_SETUP > movlw B'00001111' ; SET WDT TIMER TIMEOUT > PULLUP Off > movwf OPTION_REG > ADCON_SETUP > movlw B'11000011' ; LITERAL FOR ADCON1 > movwf ADCON1 ; LOAD ADCON1 > INT_SETUP > movlw B'01000001' ; SET UP TMR1 FOR OVERFLOW > and ADIE > movwf PIE1 > BANK0 ; RETURN TO BANK_0 > movlw B'11000000' ; INTERRUPT CONTROL ENABLE GIE AND > PIE1 > movwf INTCON ; ENABLE INT'S > > > -----Original Message----- > From: EraseMEpiclist-bouncesspam_OUTTakeThisOuTmit.edu [piclist-bouncesspam_OUTmit.edu] On Behalf Of {Quote hidden}> Mike Hord > Sent: 18 April 2006 17:30 > To: Microcontroller discussion list - Public. > Subject: Re: [PIC] PIC16F877A PortD ? > > Are there analog input options on those pins? I think I > remember some parts having analog on PORTD, but that > could just be my imagination... > > Mike H. > > On 4/18/06, Bob Axtell <@spam@engineerKILLspamcotse.net> wrote: > >> This is embarassing. I have used this part in the past and >> never had a problem with portD, but I have 4 PCBs showing >> that PortD, with pins set as inputs, never seems to pass data >> into w. I know that portD uses the "Parallel Port" feature, but >> I think I have turned it off. >> >> I guess I am missing something. . Any ideas? >> >> --Bob >> --