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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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mma8653/mma8653.go
+7 -6
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@@ -12,6 +12,7 @@ import (
// Device wraps an I2C connection to a MMA8653 device.
type Device struct {
bus machine.I2C
Address uint16
sensitivity Sensitivity
}
@@ -20,34 +21,34 @@ 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, Sensitivity2G}
return Device{bus, Address, Sensitivity2G}
}
// Connected returns whether a MMA8653 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] == 0x5A
}
// Configure sets up the device for communication.
func (d *Device) Configure(speed DataRate, sensitivity Sensitivity) error {
// Set mode to STANDBY to be able to change the sensitivity.
err := d.bus.WriteRegister(Address, CTRL_REG1, []uint8{0})
err := d.bus.WriteRegister(uint8(d.Address), CTRL_REG1, []uint8{0})
if err != nil {
return err
}
// Set sensitivity (2G, 4G, 8G).
err = d.bus.WriteRegister(Address, XYZ_DATA_CFG, []uint8{uint8(sensitivity)})
err = d.bus.WriteRegister(uint8(d.Address), XYZ_DATA_CFG, []uint8{uint8(sensitivity)})
if err != nil {
return err
}
d.sensitivity = sensitivity
// Set mode to ACTIVE and set the data rate.
err = d.bus.WriteRegister(Address, CTRL_REG1, []uint8{(uint8(speed) << 3) | 1})
err = d.bus.WriteRegister(uint8(d.Address), CTRL_REG1, []uint8{(uint8(speed) << 3) | 1})
if err != nil {
return err
}
@@ -60,7 +61,7 @@ func (d *Device) Configure(speed DataRate, sensitivity Sensitivity) error {
// -1000000.
func (d Device) ReadAcceleration() (x int32, y int32, z int32, err error) {
data := make([]byte, 6)
err = d.bus.ReadRegister(Address, OUT_X_MSB, data)
err = d.bus.ReadRegister(uint8(d.Address), OUT_X_MSB, data)
shift := uint32(8)
switch d.sensitivity {
case Sensitivity4G: