107 lines
2.4 KiB
Go
107 lines
2.4 KiB
Go
package i2c
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const mma7660DefaultAddress = 0x4c
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const (
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MMA7660_X = 0x00
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MMA7660_Y = 0x01
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MMA7660_Z = 0x02
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MMA7660_TILT = 0x03
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MMA7660_SRST = 0x04
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MMA7660_SPCNT = 0x05
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MMA7660_INTSU = 0x06
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MMA7660_MODE = 0x07
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MMA7660_STAND_BY = 0x00
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MMA7660_ACTIVE = 0x01
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MMA7660_SR = 0x08
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MMA7660_AUTO_SLEEP_120 = 0x00
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MMA7660_AUTO_SLEEP_64 = 0x01
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MMA7660_AUTO_SLEEP_32 = 0x02
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MMA7660_AUTO_SLEEP_16 = 0x03
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MMA7660_AUTO_SLEEP_8 = 0x04
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MMA7660_AUTO_SLEEP_4 = 0x05
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MMA7660_AUTO_SLEEP_2 = 0x06
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MMA7660_AUTO_SLEEP_1 = 0x07
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MMA7660_PDET = 0x09
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MMA7660_PD = 0x0A
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)
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type MMA7660Driver struct {
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*Driver
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}
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// NewMMA7660Driver creates a new driver with specified i2c interface
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// Params:
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//
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// c Connector - the Adaptor to use with this Driver
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//
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// Optional params:
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//
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// i2c.WithBus(int): bus to use with this driver
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// i2c.WithAddress(int): address to use with this driver
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func NewMMA7660Driver(c Connector, options ...func(Config)) *MMA7660Driver {
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d := &MMA7660Driver{
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Driver: NewDriver(c, "MMA7660", mma7660DefaultAddress),
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}
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d.afterStart = d.initialize
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for _, option := range options {
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option(d)
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}
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// TODO: add commands for API
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return d
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}
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// Acceleration returns the acceleration of the provided x, y, z
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//
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//nolint:nonamedreturns // is sufficient here
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func (d *MMA7660Driver) Acceleration(x, y, z float64) (ax, ay, az float64) {
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return x / 21.0, y / 21.0, z / 21.0
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}
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// XYZ returns the raw x,y and z axis from the mma7660
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//
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//nolint:nonamedreturns // is sufficient here
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func (d *MMA7660Driver) XYZ() (x float64, y float64, z float64, err error) {
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buf := []byte{0, 0, 0}
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bytesRead, err := d.connection.Read(buf)
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if err != nil {
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return
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}
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if bytesRead != 3 {
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err = ErrNotEnoughBytes
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return
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}
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for _, val := range buf {
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if ((val >> 6) & 0x01) == 1 {
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err = ErrNotReady
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return
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}
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}
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x = float64((int8(buf[0]) << 2)) / 4.0
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y = float64((int8(buf[1]) << 2)) / 4.0
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z = float64((int8(buf[2]) << 2)) / 4.0
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return
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}
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func (d *MMA7660Driver) initialize() error {
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if _, err := d.connection.Write([]byte{MMA7660_MODE, MMA7660_STAND_BY}); err != nil {
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return err
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}
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if _, err := d.connection.Write([]byte{MMA7660_SR, MMA7660_AUTO_SLEEP_32}); err != nil {
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return err
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}
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if _, err := d.connection.Write([]byte{MMA7660_MODE, MMA7660_ACTIVE}); err != nil {
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return err
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}
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return nil
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}
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