Unverified Commit a8b82a0a authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

Hard-code I²C Bus ID. It's not like it's gonna change anytime soon.

parent a74b1e75

init.lua

+1 −1
Original line number Diff line number Diff line
@@ -17,7 +17,7 @@ gpio.mode(ledpin, gpio.OUTPUT) 
gpio.write(ledpin, 0)



sen5x = require("sen5x")

i2c.setup(sen5x.bus_id, 2, 1, i2c.SLOW)

i2c.setup(0, 2, 1, i2c.SLOW)



function log_restart()

	print("Network error " .. wifi.sta.status())

sen5x.lua

+32 −33
Original line number Diff line number Diff line 
local sen5x = {}

local device_address = 0x69



sen5x.bus_id = 0

sen5x.status = "Initializing"



function sen5x.start()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.TRANSMITTER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.TRANSMITTER) then

		return false

	end

	i2c.write(sen5x.bus_id, {0x00, 0x21})

	i2c.stop(sen5x.bus_id)

	i2c.write(0, {0x00, 0x21})

	i2c.stop(0)

	return true

end



function sen5x.stop()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.TRANSMITTER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.TRANSMITTER) then

		return false

	end

	i2c.write(sen5x.bus_id, {0x01, 0x04})

	i2c.stop(sen5x.bus_id)

	i2c.write(0, {0x01, 0x04})

	i2c.stop(0)

	return true

end
@@ -33,22 +32,22 @@ function sen5x.read_value(data, index) 
end



function sen5x.prepare_read()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.TRANSMITTER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.TRANSMITTER) then

		return false

	end

	i2c.write(sen5x.bus_id, {0x03, 0xc4})

	i2c.stop(sen5x.bus_id)

	i2c.write(0, {0x03, 0xc4})

	i2c.stop(0)

	return true

end



function sen5x.read()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.RECEIVER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.RECEIVER) then

		return false

	end

	local data = i2c.read(sen5x.bus_id, 24)

	i2c.stop(sen5x.bus_id)

	local data = i2c.read(0, 24)

	i2c.stop(0)

	if not sen5x.crc_valid(data, 24) then

		return false

	end
@@ -64,22 +63,22 @@ function sen5x.read() 
end



function sen5x.prepare_read_status()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.TRANSMITTER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.TRANSMITTER) then

		return false

	end

	i2c.write(sen5x.bus_id, {0xd2, 0x06})

	i2c.stop(sen5x.bus_id)

	i2c.write(0, {0xd2, 0x06})

	i2c.stop(0)

	return true

end



function sen5x.read_status()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.RECEIVER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.RECEIVER) then

		return false

	end

	local data = i2c.read(sen5x.bus_id, 6)

	i2c.stop(sen5x.bus_id)

	local data = i2c.read(0, 6)

	i2c.stop(0)

	if not sen5x.crc_valid(data, 6) then

		return false

	end
@@ -105,22 +104,22 @@ function sen5x.read_status() 
end



function sen5x.prepare_get_product()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.TRANSMITTER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.TRANSMITTER) then

		return false

	end

	i2c.write(sen5x.bus_id, {0xd0, 0x14})

	i2c.stop(sen5x.bus_id)

	i2c.write(0, {0xd0, 0x14})

	i2c.stop(0)

	return true

end



function sen5x.get_product()

	i2c.start(sen5x.bus_id)

	if not i2c.address(sen5x.bus_id, device_address, i2c.RECEIVER) then

	i2c.start(0)

	if not i2c.address(0, device_address, i2c.RECEIVER) then

		return nil

	end

	local data = i2c.read(sen5x.bus_id, 48)

	i2c.stop(sen5x.bus_id)

	local data = i2c.read(0, 48)

	i2c.stop(0)

	if not sen5x.crc_valid(data, 48) then

		return false

	end