SOLVED: How to perform bit operations on a variable

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  • #117286
    EnzoF04
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    • Topics: 17
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    I’ve put a value of a component in a variable. I want to alter the value of the variable by shifting bits.

    Let’s say I’ve got a value of decunak 15. When I express decimal 15 in binary it is 0 0 0 0 1 1 1 1. My synthesizer accepts for a specific parameter decimal 15 as 0 0 0 1 1 1 1 0, which is in decimal 30. So I have to shift bits 4-7 one position to the left.

    I’ve thought it to be in a function like:

    function myBitShift(bits, positions, value)
    
    -- bits = how many bits to be shifted
    -- positions = how many positions to be shifted
    -- value = the decimal value that has to be altered via a someValue = someModulator:getModulatorValue()
    
    	local i
    	for i = bits, 1 do 
    		local shftValue = bit.lshift(value(i+1),positions)
    	end
    end

    How can I get this to work? Many thanks for all help!

    • This topic was modified 2 years, 2 months ago by EnzoF04.
    • This topic was modified 2 years, 2 months ago by EnzoF04.
    #117304
    EnzoF04
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    • Topics: 17
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    • Total: 119
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    Tedjuh helped me with the correct code, I had to use tonumber to convert the data coming from a modulator value.

    
    bit.lshift(tonumber(modVcoValue),1)
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