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megapi: use serialport adaptor and move driver to drivers/serial (#1062)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package megapi | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "log" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "gobot.io/x/gobot/v2" | ||
| "gobot.io/x/gobot/v2/drivers/serial" | ||
| ) | ||
|
|
||
| var _ gobot.Driver = (*MotorDriver)(nil) | ||
|
|
||
| type megapiMotorSerialAdaptor interface { | ||
| gobot.Adaptor | ||
| serial.SerialWriter | ||
| } | ||
|
|
||
| // MotorDriver represents a motor | ||
| type MotorDriver struct { | ||
| *serial.Driver | ||
| port byte | ||
| halted bool | ||
| writeBytesChannel chan []byte | ||
| finalizeChannel chan struct{} | ||
| syncRoot *sync.Mutex | ||
| } | ||
|
|
||
| // NewMotorDriver creates a new MotorDriver at the given port | ||
| func NewMotorDriver(a megapiMotorSerialAdaptor, port byte, opts ...serial.OptionApplier) *MotorDriver { | ||
| d := &MotorDriver{ | ||
| port: port, | ||
| halted: true, | ||
| syncRoot: &sync.Mutex{}, | ||
| writeBytesChannel: make(chan []byte), | ||
| finalizeChannel: make(chan struct{}), | ||
| } | ||
| d.Driver = serial.NewDriver(a, "MegaPiMotor", d.initialize, d.shutdown, opts...) | ||
|
|
||
| return d | ||
| } | ||
|
|
||
| // Speed sets the motors speed to the specified value | ||
| func (d *MotorDriver) Speed(speed int16) error { | ||
| d.syncRoot.Lock() | ||
| defer d.syncRoot.Unlock() | ||
|
|
||
| if d.halted { | ||
| return nil | ||
| } | ||
| return d.speedHelper(speed) | ||
| } | ||
|
|
||
| // initialize implements the Driver interface | ||
| func (d *MotorDriver) initialize() error { | ||
| d.syncRoot.Lock() | ||
| defer d.syncRoot.Unlock() | ||
|
|
||
| // sleeping is required to give the board a chance to reset after connection is done | ||
| time.Sleep(2 * time.Second) | ||
|
|
||
| // kick off thread to send bytes to the board | ||
| go func() { | ||
| for { | ||
| select { | ||
| case bytes := <-d.writeBytesChannel: | ||
| if _, err := d.adaptor().SerialWrite(bytes); err != nil { | ||
| panic(err) | ||
| } | ||
| time.Sleep(10 * time.Millisecond) | ||
| case <-d.finalizeChannel: | ||
| d.finalizeChannel <- struct{}{} | ||
| return | ||
| default: | ||
| time.Sleep(10 * time.Millisecond) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| d.halted = false | ||
| return d.speedHelper(0) | ||
| } | ||
|
|
||
| // Halt terminates the Driver interface | ||
| func (d *MotorDriver) shutdown() error { | ||
| d.syncRoot.Lock() | ||
| defer d.syncRoot.Unlock() | ||
|
|
||
| d.finalizeChannel <- struct{}{} | ||
| <-d.finalizeChannel | ||
|
|
||
| d.halted = true | ||
| return d.speedHelper(0) | ||
| } | ||
|
|
||
| // there is some sort of bug on the hardware such that you cannot | ||
| // send the exact same speed to 2 different motors consecutively | ||
| // hence we ensure we always alternate speeds | ||
| func (d *MotorDriver) speedHelper(speed int16) error { | ||
| if err := d.sendSpeed(speed - 1); err != nil { | ||
| return err | ||
| } | ||
| return d.sendSpeed(speed) | ||
| } | ||
|
|
||
| // sendSpeed sets the motors speed to the specified value | ||
| func (d *MotorDriver) sendSpeed(speed int16) error { | ||
| bufOut := new(bytes.Buffer) | ||
|
|
||
| // byte sequence: 0xff, 0x55, id, action, device, port | ||
| bufOut.Write([]byte{0xff, 0x55, 0x6, 0x0, 0x2, 0xa, d.port}) | ||
| if err := binary.Write(bufOut, binary.LittleEndian, speed); err != nil { | ||
| return err | ||
| } | ||
| bufOut.Write([]byte{0xa}) | ||
| d.writeBytesChannel <- bufOut.Bytes() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (d *MotorDriver) adaptor() megapiMotorSerialAdaptor { | ||
| if a, ok := d.Connection().(megapiMotorSerialAdaptor); ok { | ||
| return a | ||
| } | ||
|
|
||
| log.Printf("%s has no MegaPi serial connector\n", d.Name()) | ||
| return nil | ||
| } |
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