Post by thread:[PIC] Assembly language question...

Hello all, Is there a way to make the bit position in a bit oriented command variable? e.g. (I know this doesn't work, but...) ... loop ... ... incf x btfss reg, x ... ... goto loop ... Or something that has a similar effect? I also tried using INDF, but apparently that doesn't work... Thanks, Jerry

Or how about ANDing the variable to test with a byte where the bit you want to test is set and checking the zero flag? CLRF test BSF test,bit_to_test MOVF test,w ANDWF test_byte,w BTFSS STATUS,Z GOTO BIT_SET GOTO BIT_CLEAR Martin. {Quote hidden}> Hello all, > > Is there a way to make the bit position in a bit oriented command > variable? > > e.g. (I know this doesn't work, but...) > ... > loop ... > ... > incf x > btfss reg, x > ... > ... > goto loop > ... > > Or something that has a similar effect? I also tried using INDF, but > apparently that doesn't work... > > Thanks, > Jerry

It takes a lot more steps, you can rotate a 1 bit mask (0x01) x times to get it into place, AND it with reg and then check the zero flag- I'm not going to write up some code on the fly here- I've been doing soo much AVR programming, I'm afraid I'll mix the opcodes! Matt Bennett {Original Message removed}

Got it, thanks a lot guys... I sometimes forget to look beyond the command and look for alternatives to provide the same function... {Original Message removed}

This is an FAQ, check the archives. Fastest method is to use a lookup table IIRC. Mike {Quote hidden}> -----Original Message----- > From: Sumiec Jerry [SMTP:spam_OUTJerry.SumiecTakeThisOuTTEMIC.COM] > Sent: Wednesday, June 14, 2000 3:32 PM > To: .....PICLISTKILLspam@spam@MITVMA.MIT.EDU > Subject: [PIC] Assembly language question... > > Hello all, > > Is there a way to make the bit position in a bit oriented command > variable? > > e.g. (I know this doesn't work, but...) > ... > loop ... > ... > incf x > btfss reg, x > ... > ... > goto loop > ... > > Or something that has a similar effect? I also tried using INDF, but > apparently that doesn't work... > > Thanks, > Jerry