Post by thread:[PIC] : 18F, Macros and reusing labels inside

I thought I read somewhere...here or elsewhere, that with the 18F series you can reuse labels inside a macro? I built and tested some macros then went to implement them in a few places and came up with duplicate labels upon building the file. So, can you do this, and if so, whats the trick? example as follows...on a 18F4680 min_value macro cMSB,compMSB,cLSB,compLSB movf cMSB,w cpfsgt compMSB bra _minTstLsb movff cMSB,compMSB movff cLSB,compLSB bra _minDone _minTstLsb movf cLSB,w cpfsgt compLSB bra _minDone movff cMSB,compMSB movff cLSB,compLSB _minDone endm Yahoo! Mail Stay connected, organized, and protected. Take the tour: http://tour.mail.yahoo.com/mailtour.html

{Quote hidden}>-----Original Message----- >From: spam_OUTpiclist-bouncesTakeThisOuTmit.edu [.....piclist-bouncesKILLspam@spam@mit.edu] >Sent: 09 May 2005 14:15 >To: Microcontroller discussion list - Public. >Subject: [PIC] : 18F, Macros and reusing labels inside > > >I thought I read somewhere...here or elsewhere, that >with the 18F series you can reuse labels inside a >macro? > >I built and tested some macros then went to implement >them in a few places and came up with duplicate labels >upon building the file. > >So, can you do this, and if so, whats the trick? > >example as follows...on a 18F4680 > >min_value macro cMSB,compMSB,cLSB,compLSB > > movf cMSB,w > cpfsgt compMSB > bra _minTstLsb > movff cMSB,compMSB > movff cLSB,compLSB > bra _minDone >_minTstLsb > movf cLSB,w > cpfsgt compLSB > bra _minDone > movff cMSB,compMSB > movff cLSB,compLSB >_minDone > endm You have to use the LOCAL keyword. From the MPASM help file: len equ 10 ; global version size equ 20 ; note that a local variable ; may now be created and modified test macro size local len, label ; local len and label len set size ; modify local len label res len ; reserve buffer len set len-20 endm ; end macro Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. =======================================================================

alan smith wrote: > I thought I read somewhere...here or elsewhere, that > with the 18F series you can reuse labels inside a > macro? > > So, can you do this, and if so, whats the trick? Use the LOCAL directive. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com

Hello Alan & PIC.ers, ----- Original Message ----- From: "alan smith" <micro_eng2KILLspamyahoo.com> To: "Microcontroller discussion list - Public." <.....piclistKILLspam.....mit.edu> Sent: Monday, May 09, 2005 3:14 PM Subject: [PIC] : 18F, Macros and reusing labels inside {Quote hidden}> I thought I read somewhere...here or elsewhere, that > with the 18F series you can reuse labels inside a > macro? > > I built and tested some macros then went to implement > them in a few places and came up with duplicate labels > upon building the file. > > So, can you do this, and if so, whats the trick? > > example as follows...on a 18F4680 > > min_value macro cMSB,compMSB,cLSB,compLSB > > movf cMSB,w > cpfsgt compMSB > bra _minTstLsb > movff cMSB,compMSB > movff cLSB,compLSB > bra _minDone > _minTstLsb > movf cLSB,w > cpfsgt compLSB > bra _minDone > movff cMSB,compMSB > movff cLSB,compLSB > _minDone > endm > > > This is quite easy, by declaring the labels as `local' within each macro they don't fight each other. e.g.:- start_i2c MACRO ;[S] local humf_01, humf_02 bcf PIR1,SSPIF bsf SSPCON2,SEN ;send i2c START [S] bit clrf isr_scratch_B1 ;`stuck-loop' error trap freg humf_02 btfsC SSPCON2,SEN ;Wait for the Start condition to end, bra humf_01 ;ie endm decfsz isr_scratch_B1 bra humf_02 ;ie test again bsf i2c_corrupt_S_flag ;causes i2c reset humf_01 endm stop_i2c MACRO ;[P] local humf_01, humf_02 bcf PIR1,SSPIF bsf SSPCON2,PEN ;send i2c STOP [P] bit clrf isr_scratch_B0 humf_02 btfsC PIR1,SSPIF ;stop bit cycle completed bra humf_01 ;ie endm decfsz isr_scratch_B0 bra humf_02 ;ie test again bsf i2c_corrupt_P_flag humf_01 endm bestos, John email from the desk of John Sanderson. web: http://www.jscontrols.co.za email: EraseMEjohnspam_OUTTakeThisOuTjscontrols.co.za Tel: (027) 11 893 4154 Cell: 082 741 6275 Manufacturer and purveyor of force testing machines and apparatus.