yea

lua/8-mosfet.lua

@@ -0,0 +1,59 @@
+sda = 23 -- pins as on Adafruit Huzzah32 silkscreen
+scl = 22
+id = i2c.HW0 -- hardware interface
+speed = i2c.SLOW
+
+-- values for TCA9534A
+i2c_addr = 0x3F
+
+-- initialize i2c software interface
+i2c.setup(id, sda, scl, speed)
+
+port_input = 0x00
+port_output = 0x01
+reg_polarity = 0x02
+reg_config = 0x03
+
+function write_reg(addr, reg, data, callback)
+   i2c.start(id)
+   i2c.address(id, dev_address, i2c.TRANSMITTER)
+   i2c.write(id, reg, data, true)
+   i2c.stop(id)
+   return i2c.transfer(id, callback, 5000)
+end
+
+function read_reg(dev_address, dev_register, callback)
+  i2c.start(id)
+  i2c.address(id, dev_address, i2c.TRANSMITTER)
+  i2c.write(id, dev_register)
+  i2c.start(id) -- repeated start condition
+  i2c.address(id, dev_address, i2c.RECEIVER)
+  i2c.read(id, 1)
+  i2c.stop(id)
+  return i2c.transfer(id, callback, 5000)
+end
+
+write_reg(i2c_addr, reg_config, 0x00, function(_,_) print("8-mosfet: reg_config done") end)
+
+function set_mosfet(value)
+   write_reg(i2c_addr, reg_config, value, function(_,a)
+		print("set mosfet")
+   end)
+end
+
+mosfet_value = 0xFF
+function publish_status(value)
+   mosfet_value = read_reg(i2c_addr, reg_output)
+   for i = 0,8 do
+      oskar_m:publish("/shannon/kontrol/relay/"..i, bit.band(bit.rshift(mosfet_value, i), 0x1), 0, 0)
+   end
+end
+
+oskar_topichandle["/shannon/kontrol/relay"] = function (client, topic, data)
+   n = tonumber(string.sub(topic, -1))
+   if n<8 and n>=0 then
+      if data then mosfet_value = bit.band(mosfet_value, bit.lshift(1, n))
+      else mosfet_value = bit.bor(mosfet_value, bit.bnot(bit.lshift(1, n))) end
+      set_mosfet(mosfet_value)
+   end
+end