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i2c: refactor all i2c drivers to use Address property of Driver. Allows variations to override the default address as discussed in #14 (#30)

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-04-07 10:50:34 +02:00
committed by GitHub
parent b8e278e08f
commit d9b426b90b
7 changed files with 65 additions and 50 deletions
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bmp180/bmp180.go
+12 -10
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@@ -33,6 +33,7 @@ type calibrationCoefficients struct {
// Device wraps an I2C connection to a BMP180 device.
type Device struct {
bus machine.I2C
Address uint16
mode OversamplingMode
calibrationCoefficients calibrationCoefficients
}
@@ -43,8 +44,9 @@ type Device struct {
// This function only creates the Device object, it does not touch the device.
func New(bus machine.I2C) Device {
return Device{
bus: bus,
mode: ULTRAHIGHRESOLUTION,
bus: bus,
Address: Address,
mode: ULTRAHIGHRESOLUTION,
}
}
@@ -52,7 +54,7 @@ func New(bus machine.I2C) Device {
// It does a "who am I" request and checks the response.
func (d *Device) Connected() bool {
data := []byte{0}
d.bus.ReadRegister(Address, WHO_AM_I, data)
d.bus.ReadRegister(uint8(d.Address), WHO_AM_I, data)
return data[0] == CHIP_ID
}
@@ -60,7 +62,7 @@ func (d *Device) Connected() bool {
// read the calibration coefficientes.
func (d *Device) Configure() {
data := make([]byte, 22)
err := d.bus.ReadRegister(Address, AC1_MSB, data)
err := d.bus.ReadRegister(uint8(d.Address), AC1_MSB, data)
if err != nil {
return
}
@@ -85,7 +87,7 @@ func (d *Device) Temperature() (temperature int32, err error) {
}
b5 := d.calculateB5(rawTemp)
t := (b5 + 8) >> 4
return 100*t, nil
return 100 * t, nil
}
// Pressure returns the pressure in milli pascals (mPa)
@@ -118,15 +120,15 @@ func (d *Device) Pressure() (pressure int32, err error) {
x1 = (p >> 8) * (p >> 8)
x1 = (x1 * 3038) >> 16
x2 = (-7357 * p) >> 16
return 1000*(p + ((x1 + x2 + 3791) >> 4)), nil
return 1000 * (p + ((x1 + x2 + 3791) >> 4)), nil
}
// rawTemp returns the sensor's raw values of the temperature
func (d *Device) rawTemp() (int16, error) {
d.bus.WriteRegister(Address, REG_CTRL, []byte{CMD_TEMP})
d.bus.WriteRegister(uint8(d.Address), REG_CTRL, []byte{CMD_TEMP})
time.Sleep(5 * time.Millisecond)
data := make([]byte, 2)
err := d.bus.ReadRegister(Address, REG_TEMP_MSB, data)
err := d.bus.ReadRegister(uint8(d.Address), REG_TEMP_MSB, data)
if err != nil {
return 0, err
}
@@ -142,10 +144,10 @@ func (d *Device) calculateB5(rawTemp int16) int32 {
// rawPressure returns the sensor's raw values of the pressure
func (d *Device) rawPressure(mode OversamplingMode) (int32, error) {
d.bus.WriteRegister(Address, REG_CTRL, []byte{CMD_PRESSURE + byte(mode<<6)})
d.bus.WriteRegister(uint8(d.Address), REG_CTRL, []byte{CMD_PRESSURE + byte(mode<<6)})
time.Sleep(pauseForReading(mode))
data := make([]byte, 3)
err := d.bus.ReadRegister(Address, REG_PRESSURE_MSB, data)
err := d.bus.ReadRegister(uint8(d.Address), REG_PRESSURE_MSB, data)
if err != nil {
return 0, err
}