AW: [basicstamps] Re: Select/Case
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Posts: 46,084
Hi Adrian,
first of all thanks very much for your help. As I read in your explanation I
think I understood the case / tcase right. But when I tried to make one
SELECT / ENDSELECT loop out of the single ones I am using now it just didn't
work though I used TCASE which should lead to exactly the same result.
I think when my program is all ready and tested I will try to recahnge it to
the one big loop, if it still doesn't work I might send you the code and you
could have a look if you find the mistake. I donot have to look at the port
after each SELECT CASE, that was not the reason why I switched to single
loops.
Thanx very much again and I will tell you about my progress.
Have a nice day, Uli
possibly your program uses more selects than are neccessary, it
depends on what you intend to do. Wich each new select you are
re-reading sensorport (which may be what you intend/need to do).
I assume sensorport ranges from 0 to 15, so you could simplify some
of your cases to a more efficient if statement:
select sensorport
case 1,3,5,7,9,11,13,15
could be replaced by
if sensorport.bit0 = 1 'all odd values
and
select sensorport
case 1,3,5,7,9,11,13,15
could be replaced by
if sensorport.bit0 = 0 'all even values
The difference between case and tcase is that after a case clause
execution continues after the endselect,
after a Tcase execution continues after the Tcase clause possibly
leading into a following case/tcase clause.
Example:
For x = 1 the following select executes actions_1 only, for x = 3
it executes actions_2.
select x
case 1
actions_1
case <5
actions_2
endselect
For x = 1 the following select executes actions_1 and actions2 as
x is = 1 and < 5 as well, for x = 3 it executes actions_2 only.
select x
tcase 1
actions_1
case <5
actions_2
endselect
regards
Adrian
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first of all thanks very much for your help. As I read in your explanation I
think I understood the case / tcase right. But when I tried to make one
SELECT / ENDSELECT loop out of the single ones I am using now it just didn't
work though I used TCASE which should lead to exactly the same result.
I think when my program is all ready and tested I will try to recahnge it to
the one big loop, if it still doesn't work I might send you the code and you
could have a look if you find the mistake. I donot have to look at the port
after each SELECT CASE, that was not the reason why I switched to single
loops.
Thanx very much again and I will tell you about my progress.
Have a nice day, Uli
possibly your program uses more selects than are neccessary, it
depends on what you intend to do. Wich each new select you are
re-reading sensorport (which may be what you intend/need to do).
I assume sensorport ranges from 0 to 15, so you could simplify some
of your cases to a more efficient if statement:
select sensorport
case 1,3,5,7,9,11,13,15
could be replaced by
if sensorport.bit0 = 1 'all odd values
and
select sensorport
case 1,3,5,7,9,11,13,15
could be replaced by
if sensorport.bit0 = 0 'all even values
The difference between case and tcase is that after a case clause
execution continues after the endselect,
after a Tcase execution continues after the Tcase clause possibly
leading into a following case/tcase clause.
Example:
For x = 1 the following select executes actions_1 only, for x = 3
it executes actions_2.
select x
case 1
actions_1
case <5
actions_2
endselect
For x = 1 the following select executes actions_1 and actions2 as
x is = 1 and < 5 as well, for x = 3 it executes actions_2 only.
select x
tcase 1
actions_1
case <5
actions_2
endselect
regards
Adrian
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