mask value pair

[aki]

Hi folks ,

Though i know what masking means .

But is there something meaningful in writing a mask value pair in a
configuraton file . e.g.

suppressAOa 128,0
where mask is 128 and value is 0.

i assume this mask of 128 (0x80) when used over a variable should
result in 0 for success condition .

My question what is the significance of writing (mask ,value pair) ?
Does value shows the output for success result .


any help in this regards .

Thanks a lot
Aki

 

[Nick Keighley]

Though i know what masking  means .

usually means anding with some value. It usually means some bits are
important in a particular context and some aren't.

But is there something meaningful in writing a mask value pair in a
configuraton file . e.g.

I'm guessing not all bits of the value are significant

suppressAOa  128,0
where mask is 128 and value is 0.

i assume this mask of 128 (0x80) when used over a variable should
result in 0 for success condition .

My question what is the significance of writing (mask ,value pair) ?
Does value shows the output for success result .

to a certain extent this depends on the application. I'd usually
choose 1 to represent success but its up to the designer.

Masks make more sense when there are many things packed in the same
value

count_mask = F0
heartbeat_mask = 01
tx1_mask = 02
tx2_mask = 04
active-mask = 08