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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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mag3110/mag3110.go
+8 -7
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@@ -10,7 +10,8 @@ import (
// Device wraps an I2C connection to a MAG3110 device.
type Device struct {
bus machine.I2C
bus machine.I2C
Address uint16
}
// New creates a new MAG3110 connection. The I2C bus must already be
@@ -18,29 +19,29 @@ 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}
return Device{bus, Address}
}
// Connected returns whether a MAG3110 has been found.
// 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] == 0xC4
}
// Configure sets up the device for communication.
func (d Device) Configure() {
d.bus.WriteRegister(Address, CTRL_REG2, []uint8{0x80}) // Power down when not used
d.bus.WriteRegister(uint8(d.Address), CTRL_REG2, []uint8{0x80}) // Power down when not used
}
// ReadMagnetic reads the vectors of the magnetic field of the device and
// returns it.
func (d Device) ReadMagnetic() (x int16, y int16, z int16) {
d.bus.WriteRegister(Address, CTRL_REG1, []uint8{0x1a}) // Request a measurement
d.bus.WriteRegister(uint8(d.Address), CTRL_REG1, []uint8{0x1a}) // Request a measurement
data := make([]byte, 6)
d.bus.ReadRegister(Address, OUT_X_MSB, data)
d.bus.ReadRegister(uint8(d.Address), OUT_X_MSB, data)
x = int16((uint16(data[0]) << 8) | uint16(data[1]))
y = int16((uint16(data[2]) << 8) | uint16(data[3]))
z = int16((uint16(data[4]) << 8) | uint16(data[5]))
@@ -50,6 +51,6 @@ func (d Device) ReadMagnetic() (x int16, y int16, z int16) {
// ReadTemperature reads the current die temperature in degrees Celsius.
func (d Device) ReadTemperature() (temp int8) {
data := make([]byte, 1)
d.bus.ReadRegister(Address, DIE_TEMP, data)
d.bus.ReadRegister(uint8(d.Address), DIE_TEMP, data)
return int8(data[0])
}