diff options
| -rw-r--r-- | scd4x.lua | 36 |
1 files changed, 17 insertions, 19 deletions
@@ -1,41 +1,39 @@ local scd4x = {} -local device_address = 0x62 - -scd4x.bus_id = 0 +local addr = 0x62 function scd4x.start() - i2c.start(scd4x.bus_id) - if not i2c.address(scd4x.bus_id, device_address, i2c.TRANSMITTER) then + i2c.start(0) + if not i2c.address(0, addr, i2c.TRANSMITTER) then return false end - i2c.write(scd4x.bus_id, {0x21, 0xb1}) - i2c.stop(scd4x.bus_id) + i2c.write(0, {0x21, 0xb1}) + i2c.stop(0) return true end function scd4x.stop() - i2c.start(scd4x.bus_id) - if not i2c.address(scd4x.bus_id, device_address, i2c.TRANSMITTER) then + i2c.start(0) + if not i2c.address(0, addr, i2c.TRANSMITTER) then return false end - i2c.write(scd4x.bus_id, {0x3f, 0x86}) - i2c.stop(scd4x.bus_id) + i2c.write(0, {0x3f, 0x86}) + i2c.stop(0) return true end function scd4x.read() - i2c.start(scd4x.bus_id) - if not i2c.address(scd4x.bus_id, device_address, i2c.TRANSMITTER) then + i2c.start(0) + if not i2c.address(0, addr, i2c.TRANSMITTER) then return nil end - i2c.write(scd4x.bus_id, {0xec, 0x05}) - i2c.stop(scd4x.bus_id) - i2c.start(scd4x.bus_id) - if not i2c.address(scd4x.bus_id, device_address, i2c.RECEIVER) then + i2c.write(0, {0xec, 0x05}) + i2c.stop(0) + i2c.start(0) + if not i2c.address(0, addr, i2c.RECEIVER) then return nil end - local data = i2c.read(scd4x.bus_id, 9) - i2c.stop(scd4x.bus_id) + local data = i2c.read(0, 9) + i2c.stop(0) if not scd4x.crc_valid(data, 9) then return nil end |