REV command

[aeg]

According to the Picaxe Manual 2...

...to reverse the 8 bits of %10110000 (to %00001101) the command would be
let b1 = %00001101 REV 8


In an attempt to form a better understanding of this I tried the following test program but a syntax error is reported on line 3 when I try to simulate it...

start:
for b0 = 1 to 8
let b1 = %00001101 REV b0
let pins = b1
pause 1000
next b0
goto start

Can anyone explain?

aeg

 

[westaust55]

REV command - for X1 and X2 parts only

Which PICAE are you using?

I could not see a problem so cut and paste into my PE and i does not give any errors when I have the 28X1/40X1 selected.


From the manual 2, note:
The X1 and X2 parts also support
<< ; shift left
>> ; shift right
*/ ; multiply (returns middle word of result)
DIG ; return the digit value
REV ; reverse a number of bits

 

[aeg]

Thanks for pointing out that this is only for X1 and X2; I hadn't noticed that but I did try all flavours of PICAXE and found a different error message on 28X1...
"Beta - abs not currently simulated"

I am running version 5.2.0 of Programming Editor which is not shown as being a beta version and is the latest full download according to the website.

However, I had hoped that the command might have been available for the 18 pin chips!


aeg

 

[hippy]

In an attempt to form a better understanding of this I tried the following test program but a syntax error is reported on line 3 when I try to simulate it...

REV is only available for the 28X1/40X1 and a syntax error is generated if 28X1/40X1 has not been selected.

Using Programming Editor 5.2.1 simulation with 28X1 selected I get a "Beta - abs not currently simulated" report. This appears to be a typo and a limitation of the simulator package included with 5.2.1; I will pass the information along.

This should not affect operation of the REV operator on a physical PICAXE chip.

 

[westaust55]

REV command and PE version

Try installing the PE V5.2.1 patch available for download from the Rev Ed website.

While obviously will not work on the non X1/X2 parts, I do not get an error when selected to the 28X1 PICAXE

 

[BeanieBots]

westaust55, it errors for me (Ctrl F5) with 5.2.1 (F4 syntax check is OK).
Maybe YOU are still on 5.2.0?

 

[hippy]

Syntax check should pass with 28X1/40X1 selected, code using REV should work with a physical chip; the current issue is only when simulating.

 

[westaust55]

REV command in Simulation mode

Ah yes, correct - error with simulation mode
missed the Ctrl part of Ctrl-F5

error is shade of one I found in July:
http://www.picaxeforum.co.uk/showthread.php?t=9903&highlight=not+currently+simulated