Post by thread:16f873 stepper problems

RAYMOND WILLCOX wrote: > > Hi all > I'm trying to vary the speed of a stepper motor with a pot(a2d) > in a 16f873 circuit. My code 'seems' to work except for the delay part. > This code(see attachment) uses the a2d module to write a value to > register(store)to change the DELAY routine and thus the speed of the steps. > It seems to work somewhat from H'00' to H'0F'. When the value exceeds H'0F' > the delay slows down. This looks like something to do with lsb or overflow > of the CounterX regs. There is also some re-load/goto xxxx delays introduced > when the program cycles back to 'mnloop'. I don't think this is much of a > problem though? Any help or better code will be greatly appreciated. Thanks > in advance, Mark > ________________________________________________________________________ > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > > ------------------------------------------------------------------------ > Name: stepr.asm > stepr.asm Type: ASM File (application/x-unknown-content-type-asm_auto_file) > Encoding: base64 CBLOCK 0X20 CounterA,CounterB ENDC f EQU 1 w EQU 0 store EQU 0X0C OUTPUT EQU 06 Put store inside the CBLOCK statement. At the moment you are writing it ti the PIR1 register CBLOCK 0X20 CounterA,CounterB,store ENDC f EQU 1 w EQU 0 OUTPUT EQU 06 -- Best regards Tony http://www.picnpoke.com spam_OUTsalesTakeThisOuTpicnpoke.com