How to do Byte and Bit banging?

W

wl

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• Jan 30, 2012

• #2

For bitshifting operations, please have a look here:

Bit - Basic4android Wiki

 

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rayzrocket

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• Jan 30, 2012

• #3

pls help

I have been unable to find a method to concatinate two bytes into a word or char or float...in b4a.

 

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W

wl

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• Jan 30, 2012

• #4

Why not just

myword = 256 * byte1 + byte2

or similar ?

 

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D

DouglasNYoung

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• Jan 30, 2012

• #5

Unless I'm missing something, you don't need any bit manipulation functions, but simple maths i.e.

Word = HighByte * 256 + LowByte

Douglas

 

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W

wl

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• Jan 30, 2012

• #6

DouglasNYoung said:

Unless I'm missing something, you don't need any bit manipulation functions, but simple maths i.e.

Word = HighByte * 256 + LowByte

Douglas

Click to expand...

I beat you with a few seconds

 

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W

wl

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• Jan 30, 2012

• #7

Or if you really insists you could do it with bit-shifting as well ...

ShiftLeft (N As Int, Shift As Int) As Int

 

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rayzrocket

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• Jan 30, 2012

• #8

thanks i will try that

thanks for the help i will try that

 

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rayzrocket

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• Feb 1, 2012

• #9

signed to unsigned bytes!!

Thanks for the suggestions, and found out that,
when Asynchstreams receives data on Bluetooth serial connection as bytes in a Buffer(), they are 'signed bytes' which go from
0, 1, 2, 3...127,-127,-126,-125,...-2,-1
therefore simply adding 127 to the value won't fix this.

Erel has a good post that shows the use of converting a signedbyte into unsignedbyte by simple bit banging x0FF,
Bit.And(Value, 0xFF)

Word = HighByte * 256 + LowByte 'works great

I'm not good with simple math, because I'm an "idiot sevant" (more idiot than sevant).

thanks all!

 

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W

wl

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• Feb 1, 2012

• #10

Ok, so your problem is solved now ?

 

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rayzrocket

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• Mar 12, 2012

• #11

yes

yes, thanks!!!

 

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