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| author | Birte Kristina Friesel <derf@finalrewind.org> | 2024-01-15 18:40:49 +0100 |
|---|---|---|
| committer | Birte Kristina Friesel <derf@finalrewind.org> | 2024-01-15 18:40:49 +0100 |
| commit | 4528c766056caec98e2ac4ca1e881538d57faec9 (patch) | |
| tree | 551011bd1476090b55c1e7bba917878554cf8585 /max44006.lua | |
Initial commit
Diffstat (limited to 'max44006.lua')
| -rw-r--r-- | max44006.lua | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/max44006.lua b/max44006.lua new file mode 100644 index 0000000..27181d1 --- /dev/null +++ b/max44006.lua @@ -0,0 +1,64 @@ +local max44006 = {} +local device_address = 0x45 + +max44006.bus_id = 0 + +function max44006.writeReg(reg, data) + ret = true + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(max44006.bus_id, reg, data) + i2c.stop(max44006.bus_id) + return ret +end + +function max44006.readReg(reg, len) + ret = true + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(max44006.bus_id, reg) + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.RECEIVER) then + ret = false + end + local data = i2c.read(max44006.bus_id, len) + i2c.stop(max44006.bus_id) + return ret, data +end + +function max44006.start() + max44006.readReg(0x00, 1) + max44006.readReg(0x00, 1) + max44006.writeReg(0x01, 0x20) + max44006.writeReg(0x02, 0x03) +end + +function max44006.read() + ret = true + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(max44006.bus_id, {0x04}) + --i2c.stop(max44006.bus_id) + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.RECEIVER) then + ret = false + end + local data = i2c.read(max44006.bus_id, 10) + i2c.stop(max44006.bus_id) + + local mul = 0.512 + max44006.clear = (bit.lshift(string.byte(data, 1), 8) + string.byte(data, 2)) * mul + max44006.red = (bit.lshift(string.byte(data, 3), 8) + string.byte(data, 4)) * mul + max44006.green = (bit.lshift(string.byte(data, 5), 8) + string.byte(data, 6)) * mul + max44006.blue = (bit.lshift(string.byte(data, 7), 8) + string.byte(data, 8)) * mul + max44006.ir = (bit.lshift(string.byte(data, 9), 8) + string.byte(data, 10)) * mul + return ret +end + +return max44006 |