51 lines
1.4 KiB
Lua
51 lines
1.4 KiB
Lua
function bxor(a,b)
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local r = 0
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for i = 0, 31 do
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if ( a % 2 + b % 2 == 1 ) then
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r = r + 2^i
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end
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a = a / 2
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b = b / 2
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end
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return r
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end
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function getTemp()
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addr = ow.reset_search(pin)
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repeat
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tmr.wdclr()
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if (addr ~= nil) then
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crc = ow.crc8(string.sub(addr,1,7))
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if (crc == addr:byte(8)) then
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if ((addr:byte(1) == 0x10) or (addr:byte(1) == 0x28)) then
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ow.reset(pin)
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ow.select(pin, addr)
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ow.write(pin, 0x44, 1)
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tmr.delay(1000000)
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present = ow.reset(pin)
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ow.select(pin, addr)
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ow.write(pin,0xBE, 1)
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data = nil
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data = string.char(ow.read(pin))
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for i = 1, 8 do
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data = data .. string.char(ow.read(pin))
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end
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crc = ow.crc8(string.sub(data,1,8))
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if (crc == data:byte(9)) then
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t = (data:byte(1) + data:byte(2) * 256)
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if (t > 32768) then
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t = (bxor(t, 0xffff)) + 1
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t = (-1) * t
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end
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t = t * 625
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lasttemp = t
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print("Last temp: " .. lasttemp)
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end
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tmr.wdclr()
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end
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end
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end
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addr = ow.search(pin)
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until(addr == nil)
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end
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