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How to write in specific bit?

 
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Razi
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PostPosted: Fri Feb 23, 2018 2:19 am    Post subject: How to write in specific bit? Reply with quote

I want to write to a specific bit, when the CECheckBox1 is On, then write to a third bit, value = 1 in the address 0x009E868D. And when the CECheckBox1 is Off, then write to a third bit, value = 0 in the address 0x009E868D. Can you tell me how to do this?
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Dark Byte
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PostPosted: Fri Feb 23, 2018 2:28 am    Post subject: This post has 1 review(s) Reply with quote

Code:

function setbit(address, bitnr, state)
  if (bitnr>7) then error('setbit only works for byte sizes. rewrite this for bigger values') end
  b=readBytes(address,1)
  if (state==1) then
    b=b | (1<<bitnr)
  else
    b=b & ~(1<<bitnr)
  end
  writeBytes(address,b)
end


bitnumber counts from 0

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Razi
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Posts: 18

PostPosted: Sat Feb 24, 2018 10:11 am    Post subject: Reply with quote

Thank you for answer.
Then to change bits in the 4 bytes:
Code:
function setbit(address, bitnr, state)
  if (bitnr>31) then error('setbit works with 4 bytes sizes.') end
  b=readInteger(address)
  if (state==1) then
    b=b | (1<<bitnr)
  else
    b=b & ~(1<<bitnr)
  end
  writeInteger(address,b)
end

--to call this function
UDF1.CECheckBox1.OnClick = function(sender)
if UDF1.CECheckBox1.Checked == true then
setbit('009E868C', 2, 1)  -- where 2 - 3rd bit. -- where '009E868C' - address.
elseif UDF1.CECheckBox1.Checked == false then
setbit('009E868C', 2, 0)
end
end


or to read 3rd bit:
Code:
a = readInteger('address')
local bit3 = ((a >> 2)  & 0x01)
if bit3 == 1 then
UDF1.CECheckBox1.Checked = true
elseif bit3 == 0 then
UDF1.CECheckBox1.Checked = false
end


or to write in 3rd bit:
Code:
UDF1.CECheckBox1.OnClick = function(sender)
if UDF1.CECheckBox1.Checked == true then
writeInteger('address', a | (1<<2))  -- where a = readInteger('address')
elseif UDF1.CECheckBox1.Checked == false then
writeInteger('address', a & ~(1<<2))
end
end
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