I meant to say bank 0. Duh. Sometimes I still think like a user. ;-) MH >From: Mike Hord >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [PIC]:beginner needs help with input pins, read all the FAQ >Date: Tue, 10 Jun 2003 22:14:53 -0500 > >A quick peek at the datasheet (hint, hint) reveals that PORTA has a dual >duty with analog comparators. I don't see any disabling code for those in >your code...that's almost certainly the problem: the PORTA pins need to >be configured as digital pins. > >The following code should disable the comparator: > >movlw b'00000111' ; the lower 3 bits of CMCON control the status of > ; the compartor >movwf CMCON > >CMCON is in bank 1, so no selection needs to be done. Alles klar? > >Mike H. > > >>From: rrc124+@PITT.EDU >>Reply-To: pic microcontroller discussion list >>To: PICLIST@MITVMA.MIT.EDU >>Subject: [PIC]:beginner needs help with input pins, read all the FAQ >>Date: Tue, 10 Jun 2003 20:47:34 -0400 >> >>I can't get my inputs to work. I am using a pull up switch, have set all >>pins but 1 to outputs, then tied them to ground. I am using a PIC16F628 >>with the configs set to everything off/disabled except the power up timer. >>I have selected the internal oscillator. I'm a programmer..not EE, so >>that's my weak point but i have been checking the circuit for 3 days and >>can't find what's wrong. The chip works because i got one of those LED >>blinking things to work fine. Guys...thank you so much...it's very >>upsetting when you're just starting out and can't get the easiest thing to >>work. The only odd thing i could find was that my programming software >>(WinPicProg, from Dontronics) generates a different config word then does >>MPLAB with the same settings. >> >>Here is my code: >> >>TMR0 EQU 1 >>OPTION_R EQU 1 >>PORTA EQU 5 >>PORTB EQU 6 >>TRISA EQU 5 >>TRISB EQU 6 >>STATUS EQU 3 >>ZEROBIT EQU 2 >>CARRY EQU 0 >>PCON EQU 0EH >>COUNT EQU 20H >> >> LIST P=16F628 >> ; tells which processor is use >>;MPLAB generated __CONFIG 0x3F10 >> __CONFIG 0x3D10 ;WinPicProg generated >> >> org 0 >> goto START >> >>; config section >> >>START bsf STATUS, 5 >> movlw b'11111111' >> movwf TRISA >> movlw b'00000000' >> movwf TRISB >> >> movlw b'00000100' >> movwf OPTION_R >> clrf PCON >> >> bcf STATUS, 5 >> clrf PORTA >> clrf PORTB >> >>; program starts now >> >>BEGIN btfsc PORTA, 1 >> goto BEGIN >> movlw b'11111111' >> movwf PORTB >>KEEPON btfss PORTA, 1 >> goto KEEPON >> clrf PORTB >> goto BEGIN >> >> END >> >>Here is my circuit: >> GND >> | >>[9V+ Battery]--[914 diode]--[7805 Volt Reg]--+ >> | >> +-----[10k Res]----+ >> | | >> A1/PIN 18-----+--[switch]--GND | >> | >> Vdd/PIN 14------------------------+ >> >> Vss/PIN 05------------------------GND >> >> B4/PIN 10--[470 Ohm Res]--[LED]--GND >> >> B3/PIN 09--[470 Ohm Res]--[LED]--GND >> >>All other pins set as output, tied to ground. The switch part of the >>circuit allows 4.5V to A1 and when pressed drops the voltage down to 0. I >>checked with my multimeter. Thank you so much everyone. >> >>E-Mail: rrc124@pitt.edu >> >>Robert Campbell >> >> >>-- >>http://www.piclist.com hint: To leave the PICList >>mailto:piclist-unsubscribe-request@mitvma.mit.edu > >_________________________________________________________________ >Help STOP SPAM with the new MSN 8 and get 2 months FREE* >http://join.msn.com/?page=features/junkmail > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu