Is there any way to....

[Sparkoids]

I have some Flowcode that works perfectly getting a variable when the 4 input buttons are set to Active High but the PCB is designed for Active Low

Which means instead of reading 0x0 when no button is pressed it actually reads 0xF - I have logic probed the PCB and all the ports are high as they would be.

Does anyone know if there is a simple way to "reverse" the reading so it acts as if it's Active High as per the Flowchart?

I do not want to set up a IF it = x THEN let it = y because of the number of combinations and the hex is confusing me regarding the calculations required later!

Any ideas please - I'm not sure what I'm actually asking for!!!!

[JonnyW]

Hello. You want to use exclusive OR:

Code: Select all

Read input
input = input ^ 0xF

This should invert all the bits on your input.

Cheers,

Jonny

[Sparkoids]

Many thanks!

[Benj]

The not symbol '~' could also be useful.

input = (~input) & 0x0F

[Sparkoids]

Works with both it appears......

[Sparkoids]

And thank you both for that....

[Sparkoids]

Last remark on the matter.

Apparently it is better to use NOT since it only uses 1 byte and XOR uses 2 bytes I'm told.

Personally I'm just glad it works!

[JonnyW]

Hi. Yes - if you just want to invert all bits then 'not' is better than 'xor' - you would tend to use xor to invert a selection of bits, like 0xF, and leave the other bits as they were.

Jonny