The line
btfss SM_DOUT_VALUE, 7-bit_number
Appears in all of the scan matrix versions in the single shift step macro SM_BUTTON_HANDLER SHIFT MACRO bit_number
I have found
btfss f, b where b = 0-7
Can anyone help
Robin
What exactly is the question?
Oh it’s a ‘jeopardy’ game: What is the acronym for “Bit Test F, Skip if Set” ? ;D
who got an f on their bit test cause they skipped it??
LOL, me too, etc *whack*
I know what btfss means. My difficulty is with the second operand “7-bit_number”. Perhaps I have complicated this. I was thinking “any 7 bit number”, originally.
If I conclude that this is referring to the 7th bit of SM_DOUT_VALUE why not just write
btfss SM_DOUT_VALUE, 7
Robin
Well who says that bit_number is a constant? Assuming it’s a variable
“btfss SM_DOUT_VALUE, 7-bit_number”
checks a different bit depending on the content of bit_number. If bit_number is 0 for instance it’ll check the 7th bit, if it’s 3 it’ll check the 4th bit…
That is what I thought originally. However if you search for “7-bit_number” in all the files that comprise sm c example v1.zip there is only one file that contains “7-bit_number” and that file is sm fast.inc and in that file there is only one instance of “7-bit_number” and that line is the one referred to in the first instance.
This seems to discount that “7-bit_number” is a variable.
Robin
What I meant was bit_number is a variable. 7 is a constant 
7 - bit_number is a combination of a constant and a variable and is hence variable.
Thanks Nils
bit_number is a variable and appears in several places in sm_fast.
It never occurred to me that the - was a minus sign. I was thinking of it as a hyphen.
Robin
Hyphens cannot be used in variable names, only “A-Z”, “a-z”, “0-9” and “_”
I should have remembered the syntax rules!
Robin