60 lines
1.6 KiB
Lua
60 lines
1.6 KiB
Lua
sda = 23 -- pins as on Adafruit Huzzah32 silkscreen
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scl = 22
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id = i2c.HW0 -- hardware interface
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speed = i2c.SLOW
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-- values for TCA9534A
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i2c_addr = 0x3F
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-- initialize i2c software interface
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i2c.setup(id, sda, scl, speed)
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port_input = 0x00
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port_output = 0x01
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reg_polarity = 0x02
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reg_config = 0x03
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function write_reg(addr, reg, data, callback)
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i2c.start(id)
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i2c.address(id, dev_address, i2c.TRANSMITTER)
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i2c.write(id, reg, data, true)
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i2c.stop(id)
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return i2c.transfer(id, callback, 5000)
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end
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function read_reg(dev_address, dev_register, callback)
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i2c.start(id)
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i2c.address(id, dev_address, i2c.TRANSMITTER)
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i2c.write(id, dev_register)
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i2c.start(id) -- repeated start condition
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i2c.address(id, dev_address, i2c.RECEIVER)
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i2c.read(id, 1)
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i2c.stop(id)
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return i2c.transfer(id, callback, 5000)
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end
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write_reg(i2c_addr, reg_config, 0x00, function(_,_) print("8-mosfet: reg_config done") end)
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function set_mosfet(value)
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write_reg(i2c_addr, reg_config, value, function(_,a)
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print("set mosfet")
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end)
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end
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mosfet_value = 0xFF
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function publish_status(value)
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mosfet_value = read_reg(i2c_addr, reg_output)
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for i = 0,8 do
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oskar_m:publish("/shannon/kontrol/relay/"..i, bit.band(bit.rshift(mosfet_value, i), 0x1), 0, 0)
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end
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end
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oskar_topichandle["/shannon/kontrol/relay"] = function (client, topic, data)
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n = tonumber(string.sub(topic, -1))
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if n<8 and n>=0 then
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if data then mosfet_value = bit.band(mosfet_value, bit.lshift(1, n))
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else mosfet_value = bit.bor(mosfet_value, bit.bnot(bit.lshift(1, n))) end
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set_mosfet(mosfet_value)
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end
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end
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