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i2c: add bmp280 driver, then encapsulate it with bme280 and add Humidity
Signed-off-by: deadprogram <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| package i2c | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
|
|
||
| "gobot.io/x/gobot" | ||
| ) | ||
|
|
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| const bmp280RegisterCalib00 = 0x88 | ||
|
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| type bmp280CalibrationCoefficients struct { | ||
| t1 uint16 | ||
| t2 int16 | ||
| t3 int16 | ||
| p1 uint16 | ||
| p2 int16 | ||
| p3 int16 | ||
| p4 int16 | ||
| p5 int16 | ||
| p6 int16 | ||
| p7 int16 | ||
| p8 int16 | ||
| p9 int16 | ||
| } | ||
|
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| // BMP280Driver is a driver for the BMP280 temperature/pressure sensor | ||
| type BMP280Driver struct { | ||
| name string | ||
| connector Connector | ||
| connection Connection | ||
| Config | ||
|
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| tpc *bmp280CalibrationCoefficients | ||
| } | ||
|
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| // NewBMP280Driver creates a new driver with specified i2c interface. | ||
| // Params: | ||
| // conn Connector - the Adaptor to use with this Driver | ||
| // | ||
| // Optional params: | ||
| // i2c.WithBus(int): bus to use with this driver | ||
| // i2c.WithAddress(int): address to use with this driver | ||
| // | ||
| func NewBMP280Driver(c Connector, options ...func(Config)) *BMP280Driver { | ||
| b := &BMP280Driver{ | ||
| name: gobot.DefaultName("BMP280"), | ||
| connector: c, | ||
| Config: NewConfig(), | ||
| tpc: &bmp280CalibrationCoefficients{}, | ||
| } | ||
|
|
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| for _, option := range options { | ||
| option(b) | ||
| } | ||
|
|
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| // TODO: expose commands to API | ||
| return b | ||
| } | ||
|
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| // Name returns the name of the device. | ||
| func (d *BMP280Driver) Name() string { | ||
| return d.name | ||
| } | ||
|
|
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| // SetName sets the name of the device. | ||
| func (d *BMP280Driver) SetName(n string) { | ||
| d.name = n | ||
| } | ||
|
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| // Connection returns the connection of the device. | ||
| func (d *BMP280Driver) Connection() gobot.Connection { | ||
| return d.connector.(gobot.Connection) | ||
| } | ||
|
|
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| // Start initializes the BMP280 and loads the calibration coefficients. | ||
| func (d *BMP280Driver) Start() (err error) { | ||
| bus := d.GetBusOrDefault(d.connector.GetDefaultBus()) | ||
| address := d.GetAddressOrDefault(bmp180Address) | ||
|
|
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| if d.connection, err = d.connector.GetConnection(address, bus); err != nil { | ||
| return err | ||
| } | ||
|
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| // TODO: set sleep mode here... | ||
|
|
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| if err := d.initialization(); err != nil { | ||
| return err | ||
| } | ||
|
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| // TODO: set usage mode here... | ||
|
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| // TODO: set default sea level here | ||
|
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| return nil | ||
| } | ||
|
|
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| // Halt halts the device. | ||
| func (d *BMP280Driver) Halt() (err error) { | ||
| return nil | ||
| } | ||
|
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| // Temperature returns the current temperature, in celsius degrees. | ||
| func (d *BMP280Driver) Temperature() (temp float32, err error) { | ||
| // TODO: implement this | ||
| return 0, nil | ||
| } | ||
|
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| // Pressure returns the current barometric pressure, in Pa | ||
| func (d *BMP280Driver) Pressure() (press float32, err error) { | ||
| // TODO: implement this | ||
| return 0, nil | ||
| } | ||
|
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| // initialization reads the calibration coefficients. | ||
| func (d *BMP280Driver) initialization() (err error) { | ||
| // TODO: set sleep mode here... | ||
|
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| var coefficients []byte | ||
| if coefficients, err = d.read(bmp280RegisterCalib00, 26); err != nil { | ||
| return err | ||
| } | ||
| buf := bytes.NewBuffer(coefficients) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.t1) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.t2) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.t3) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p1) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p2) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p3) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p4) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p5) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p6) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p7) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p8) | ||
| binary.Read(buf, binary.LittleEndian, &d.tpc.p9) | ||
|
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| // TODO: set usage mode here... | ||
| // TODO: set default sea level here | ||
|
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| return nil | ||
| } | ||
|
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| // TODO: implement | ||
| func (d *BMP280Driver) rawTempPress() (temp int16, press int16, err error) { | ||
| return 0, 0, nil | ||
| } | ||
|
|
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| // TODO: implement | ||
| func (d *BMP280Driver) calculateTemp(rawTemp int16) float32 { | ||
| return 0 | ||
| } | ||
|
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| // TODO: implement | ||
| func (d *BMP280Driver) calculatePress(rawPress int16) float32 { | ||
| return 0 | ||
| } | ||
|
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| func (d *BMP280Driver) read(address byte, n int) ([]byte, error) { | ||
| if _, err := d.connection.Write([]byte{address}); err != nil { | ||
| return nil, err | ||
| } | ||
| buf := make([]byte, n) | ||
| bytesRead, err := d.connection.Read(buf) | ||
| if bytesRead != n || err != nil { | ||
| return nil, err | ||
| } | ||
| return buf, nil | ||
| } |
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