Post by thread:[pic]: A/D Conversion using interrupt ( PANIC ON )

part 1 240 bytes content-type:text/plain; (decoded 7bit) Hi to all, I got bar graph meter done without A/D interrupt enabled then I decided to use A/D interrupt and I can't get ADCON0,ADIF flag set. any help will highly appreciated. see attached file Andre part 2 5386 bytes content-type:application/octet-stream; (decode) part 3 135 bytes -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use spam_OUTlistservTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST

On Tue, 17 Oct 2000, Andre Abelian wrote: > Hi to all, > > I got bar graph meter done without A/D interrupt enabled then > I decided to use A/D interrupt and I can't get ADCON0,ADIF flag set. > any help will highly appreciated. Shouldn't you have this: ADSERVICE: BTFSS ADCON0,ADIF ; A/D INTERUUPT RETFIE ; NO THEN IGNORE MOVF ADRES,W ; GET A/D VALUE andlw 0x7 ;there are only eight entries CALL TABLE You may be branching off into lala land. Scott PS. I think this is the second post on the piclist with actually pic code today! -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use .....listservKILLspam@spam@mitvma.mit.edu?body=SET%20PICList%20DIGEST

Scott, thanks for your replay I just added andlw 0x7 and no help Andre {Quote hidden}> On Tue, 17 Oct 2000, Andre Abelian wrote: > > > Hi to all, > > > > I got bar graph meter done without A/D interrupt enabled then > > I decided to use A/D interrupt and I can't get ADCON0,ADIF flag set. > > any help will highly appreciated. > > Shouldn't you have this: > > ADSERVICE: > BTFSS ADCON0,ADIF ; A/D INTERUUPT > RETFIE ; NO THEN IGNORE > MOVF ADRES,W ; GET A/D VALUE > andlw 0x7 ;there are only eight entries > CALL TABLE > > You may be branching off into lala land. > > Scott > > PS. I think this is the second post on the piclist with actually pic code today! > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use listservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use .....listservKILLspam.....mitvma.mit.edu?body=SET%20PICList%20DIGEST

Hi Andre 1 - It appears your interrupt goes to ADSERVICE: but returns through PULL. Shouldn't your interrupt go to PUSH and then do a 'goto PULL' if it is not the A/D interrupt 2 - Wouldn't it be easier to have the A/D interrupt routine restart the A/D conversion cycle? Maybe not relevant if the PIC is doing other things as well. 3 - doing andlw 0x7 will give you the least significant bits from the A/D. If you want the most significant bits you will need to do some more work maybe, rrf ADRES,F swap ADRES,W andlw 7 call TABLE It looks interesting and quite easy to expand to 16 LEDs. Dave Mumert ----- Original Message ----- From: "Andre Abelian" <EraseMEengelecspam_OUTTakeThisOuTEARTHLINK.NET> To: <PICLISTspam_OUTMITVMA.MIT.EDU> Sent: Tuesday, October 17, 2000 5:09 PM Subject: Re: [pic]: A/D Conversion using interrupt ( PANIC ON ) > Scott, > > thanks for your replay > I just added andlw 0x7 and no help > > Andre -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use @spam@listservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST

Andre Abelian wrote: >Hi to all, > >I got bar graph meter done without A/D interrupt enabled then >I decided to use A/D interrupt and I can't get ADCON0,ADIF flag set. >any help will highly appreciated. > > >see attached file >Andre > >Attachment Converted: C:\WIN31APP\SUPERNET\EUDORA\ATTACH\bargraph.asm > Andre, Found these in your file: list p=16c74A #include c:\mplab\p16c74A.inc If you "are" using a PIC74, maybe try changing the following lines: BCF ADCON0,ADIF ; RESET A/D INIT FLAG (ADIF) LOOP BTFSC ADCON0,ADIF ; A/D OVER ? BTFSS ADCON0,ADIF ; A/D INTERUUPT BSF INTCON,ADIE ; ENABLE A/D INIT to these: BCF pir1,ADIF ; RESET A/D INIT FLAG (ADIF) LOOP BTFSC pir1,ADIF ; A/D OVER ? BTFSS pir1,ADIF ; A/D INTERUUPT BSF pie1,ADIE ; ENABLE A/D INIT also, check that you are re-initializing everything after this instr: CLRF INTCON ; CLEAR ALL INTERRUPTS also, is this a defined variable, or do you really mean < pir1 >? UPDATE: BCF ADIF,6 ; RESET SOFTWARE A/D FLAG -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use KILLspamlistservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST

The next thing to think about is scaling the ADC value to the height of the bar. You will need to divide the 8-bit value by 8 to get the number of lights to light. for example, a value of 144decimal needs to light 144/(256/8) or 4.5 leds. then the height of the bar is proportional to the adc value. alice {Quote hidden}> Hi to all, > > I got bar graph meter done without A/D interrupt enabled then > I decided to use A/D interrupt and I can't get ADCON0,ADIF flag set. > any help will highly appreciated. > > > see attached file > Andre > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use RemoveMElistservTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST

> I got bar graph meter done without A/D interrupt enabled then > I decided to use A/D interrupt and I can't get ADCON0,ADIF flag set. > any help will highly appreciated. The ADIF bit is in PIR1, not ADCON0. ***************************************************************** Olin Lathrop, embedded systems consultant in Devens Massachusetts (978) 772-3129, spamBeGoneolinspamBeGonecognivis.com, http://www.cognivis.com -- http://www.piclist.com hint: To leave the PICList TakeThisOuTpiclist-unsubscribe-requestEraseMEspam_OUTmitvma.mit.edu