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3 Commits
release
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read-chara
Author | SHA1 | Date | |
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97f17e93f1 | ||
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47770f6c59 | ||
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3e31cedee9 |
@ -219,6 +219,16 @@ func handleEvent() {
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}
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}
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}
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case C.BLE_GATTC_EVT_READ_RSP:
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readEvent := gattcEvent.params.unionfield_read_rsp()
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if debug {
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println("evt: read response, data length", readEvent.len)
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}
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readingCharacteristic.handle_value.Set(readEvent.handle)
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readingCharacteristic.offset = readEvent.offset
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// Create a Go slice from the data.
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readingCharacteristic.value = (*[255]byte)(unsafe.Pointer(&readEvent.data[0]))[:readEvent.len:readEvent.len]
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case C.BLE_GATTC_EVT_HVX:
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hvxEvent := gattcEvent.params.unionfield_hvx()
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switch hvxEvent._type {
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@ -68,6 +68,12 @@ func main() {
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}
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for _, char := range chars {
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println("-- characteristic", char.UUID().String())
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val, err := char.Read()
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if err != nil {
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println("---", err.Error())
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} else {
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println("--- value =", string(val))
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}
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}
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}
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@ -162,5 +162,9 @@ func (pd *peripheralDelegate) DidUpdateValueForCharacteristic(prph cbgo.Peripher
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if char != nil && char.callback != nil {
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go char.callback(chr.Value())
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}
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if char.readChan != nil {
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char.readChan <- nil
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}
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}
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}
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@ -14,7 +14,7 @@ import (
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//
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// Passing a nil slice of UUIDs will return a complete list of
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// services.
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func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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func (d *Device) DiscoverServices(uuids []UUID) ([]*DeviceService, error) {
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cbuuids := []cbgo.UUID{}
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for _, u := range uuids {
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uuid, _ := cbgo.ParseUUID(u.String())
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@ -29,16 +29,16 @@ func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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// wait on channel for service discovery
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select {
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case <-d.servicesChan:
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svcs := []DeviceService{}
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svcs := []*DeviceService{}
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for _, dsvc := range d.prph.Services() {
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uuid, _ := ParseUUID(dsvc.UUID().String())
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svc := DeviceService{
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svc := &DeviceService{
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uuidWrapper: uuid,
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device: d,
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service: dsvc,
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}
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svcs = append(svcs, svc)
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d.services[svc.uuidWrapper] = &svc
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d.services[svc.uuidWrapper] = svc
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}
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return svcs, nil
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case <-time.NewTimer(10 * time.Second).C:
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@ -73,7 +73,7 @@ func (s *DeviceService) UUID() UUID {
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//
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// Passing a nil slice of UUIDs will return a complete list of
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// characteristics.
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func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacteristic, error) {
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func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]*DeviceCharacteristic, error) {
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cbuuids := []cbgo.UUID{}
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for _, u := range uuids {
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uuid, _ := cbgo.ParseUUID(u.String())
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@ -88,16 +88,16 @@ func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacter
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// wait on channel for characteristic discovery
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select {
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case <-s.device.charsChan:
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chars := []DeviceCharacteristic{}
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chars := []*DeviceCharacteristic{}
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for _, dchar := range s.service.Characteristics() {
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uuid, _ := ParseUUID(dchar.UUID().String())
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char := DeviceCharacteristic{
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char := &DeviceCharacteristic{
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uuidWrapper: uuid,
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service: s,
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characteristic: dchar,
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}
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chars = append(chars, char)
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s.device.characteristics[char.uuidWrapper] = &char
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s.device.characteristics[char.uuidWrapper] = char
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}
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return chars, nil
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case <-time.NewTimer(10 * time.Second).C:
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@ -114,6 +114,7 @@ type DeviceCharacteristic struct {
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characteristic cbgo.Characteristic
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callback func(buf []byte)
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readChan chan error
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}
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// UUID returns the UUID for this DeviceCharacteristic.
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@ -125,7 +126,7 @@ func (c *DeviceCharacteristic) UUID() UUID {
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// call will return before all data has been written. A limited number of such
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// writes can be in flight at any given time. This call is also known as a
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// "write command" (as opposed to a write request).
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func (c DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error) {
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func (c *DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error) {
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c.service.device.prph.WriteCharacteristic(p, c.characteristic, false)
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return len(p), nil
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@ -135,7 +136,7 @@ func (c DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error)
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// Configuration Descriptor (CCCD). This means that most peripherals will send a
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// notification with a new value every time the value of the characteristic
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// changes.
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func (c DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) error {
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func (c *DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) error {
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if callback == nil {
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return errors.New("must provide a callback for EnableNotifications")
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}
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@ -145,3 +146,20 @@ func (c DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) err
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return nil
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}
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// Read reads the current characteristic value.
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func (c *DeviceCharacteristic) Read() (data []byte, err error) {
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c.readChan = make(chan error)
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c.service.device.prph.ReadCharacteristic(c.characteristic)
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// wait for result
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select {
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case <-c.readChan:
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c.readChan = nil
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case <-time.NewTimer(10 * time.Second).C:
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c.readChan = nil
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return nil, errors.New("timeout on Read()")
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}
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return c.characteristic.Value(), nil
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}
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@ -37,7 +37,7 @@ func (s *DeviceService) UUID() UUID {
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//
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// On Linux with BlueZ, this just waits for the ServicesResolved signal (if
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// services haven't been resolved yet) and uses this list of cached services.
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func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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func (d *Device) DiscoverServices(uuids []UUID) ([]*DeviceService, error) {
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for {
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resolved, err := d.device.GetServicesResolved()
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if err != nil {
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@ -50,7 +50,7 @@ func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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time.Sleep(10 * time.Millisecond)
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}
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services := []DeviceService{}
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services := []*DeviceService{}
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uuidServices := make(map[string]string)
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servicesFound := 0
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@ -98,7 +98,7 @@ func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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}
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uuid, _ := ParseUUID(service.Properties.UUID)
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ds := DeviceService{uuidWrapper: uuid,
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ds := &DeviceService{uuidWrapper: uuid,
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service: service,
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}
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@ -136,8 +136,8 @@ func (c *DeviceCharacteristic) UUID() UUID {
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//
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// Passing a nil slice of UUIDs will return a complete
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// list of characteristics.
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func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacteristic, error) {
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chars := []DeviceCharacteristic{}
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func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]*DeviceCharacteristic, error) {
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chars := []*DeviceCharacteristic{}
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uuidChars := make(map[string]string)
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characteristicsFound := 0
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@ -185,7 +185,8 @@ func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacter
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}
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uuid, _ := ParseUUID(char.Properties.UUID)
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dc := DeviceCharacteristic{uuidWrapper: uuid,
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dc := &DeviceCharacteristic{
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uuidWrapper: uuid,
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characteristic: char,
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}
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@ -205,7 +206,7 @@ func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacter
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// call will return before all data has been written. A limited number of such
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// writes can be in flight at any given time. This call is also known as a
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// "write command" (as opposed to a write request).
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func (c DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error) {
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func (c *DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error) {
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err = c.characteristic.WriteValue(p, nil)
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if err != nil {
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return 0, err
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@ -217,7 +218,7 @@ func (c DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error)
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// Configuration Descriptor (CCCD). This means that most peripherals will send a
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// notification with a new value every time the value of the characteristic
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// changes.
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func (c DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) error {
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func (c *DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) error {
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ch, err := c.characteristic.WatchProperties()
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if err != nil {
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return err
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@ -231,3 +232,9 @@ func (c DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) err
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}()
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return c.characteristic.StartNotify()
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}
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// Read reads the current characteristic value.
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func (c *DeviceCharacteristic) Read() ([]byte, error) {
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options := make(map[string]interface{})
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return c.characteristic.ReadValue(options)
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}
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48
gattc_sd.go
48
gattc_sd.go
@ -62,7 +62,7 @@ func (s *DeviceService) UUID() UUID {
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//
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// On the Nordic SoftDevice, only one service discovery procedure may be done at
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// a time.
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func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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func (d *Device) DiscoverServices(uuids []UUID) ([]*DeviceService, error) {
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if discoveringService.state.Get() != 0 {
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// Not concurrency safe, but should catch most concurrency misuses.
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return nil, errAlreadyDiscovering
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@ -72,7 +72,7 @@ func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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if len(uuids) > 0 {
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sz = len(uuids)
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}
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services := make([]DeviceService, 0, sz)
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services := make([]*DeviceService, 0, sz)
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var shortUUIDs []C.ble_uuid_t
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@ -133,7 +133,7 @@ func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
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}
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// Store the discovered service.
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svc := DeviceService{
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svc := &DeviceService{
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uuid: suuid,
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connectionHandle: d.connectionHandle,
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startHandle: startHandle,
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@ -191,7 +191,7 @@ var discoveringCharacteristic struct {
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//
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// Passing a nil slice of UUIDs will return a complete
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// list of characteristics.
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func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacteristic, error) {
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func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]*DeviceCharacteristic, error) {
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if discoveringCharacteristic.handle_value.Get() != 0 {
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return nil, errAlreadyDiscovering
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}
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@ -200,7 +200,7 @@ func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacter
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if len(uuids) > 0 {
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sz = len(uuids)
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}
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characteristics := make([]DeviceCharacteristic, 0, sz)
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characteristics := make([]*DeviceCharacteristic, 0, sz)
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var shortUUIDs []C.ble_uuid_t
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@ -276,7 +276,7 @@ func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacter
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permissions |= CharacteristicIndicatePermission
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}
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dc := DeviceCharacteristic{uuid: discoveringCharacteristic.uuid}
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dc := &DeviceCharacteristic{uuid: discoveringCharacteristic.uuid}
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dc.permissions = permissions
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dc.valueHandle = foundCharacteristicHandle
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@ -319,7 +319,7 @@ func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacter
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// call will return before all data has been written. A limited number of such
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// writes can be in flight at any given time. This call is also known as a
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// "write command" (as opposed to a write request).
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func (c DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error) {
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func (c *DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error) {
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if len(p) == 0 {
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return 0, nil
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}
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@ -337,6 +337,38 @@ func (c DeviceCharacteristic) WriteWithoutResponse(p []byte) (n int, err error)
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return len(p), nil
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}
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// A global used to pass information from the event handler back to the
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// Read function below.
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var readingCharacteristic struct {
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handle_value volatile.Register16
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offset uint16
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value []byte
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}
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// Read reads the current characteristic value up to MTU length.
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// A future enhancement would be to be able to retrieve a longer
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// value by making multiple calls.
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func (c *DeviceCharacteristic) Read() ([]byte, error) {
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errCode := C.sd_ble_gattc_read(c.connectionHandle, c.valueHandle, 0)
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if errCode != 0 {
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return nil, Error(errCode)
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}
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// wait for response with data
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for readingCharacteristic.handle_value.Get() == 0 {
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arm.Asm("wfe")
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}
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// copy data since value is slice to unsafe pointer.
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data := make([]byte, len(readingCharacteristic.value))
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copy(data, readingCharacteristic.value)
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// prepare for next read
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readingCharacteristic.handle_value.Set(0)
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return data, nil
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}
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type gattcNotificationCallback struct {
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connectionHandle uint16
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valueHandle uint16 // may be 0 if the slot is empty
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@ -356,7 +388,7 @@ var gattcNotificationCallbacks []gattcNotificationCallback
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// Warning: when using the SoftDevice, the callback is called from an interrupt
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// which means there are various limitations (such as not being able to allocate
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// heap memory).
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func (c DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) error {
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func (c *DeviceCharacteristic) EnableNotifications(callback func(buf []byte)) error {
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if c.permissions&CharacteristicNotifyPermission == 0 {
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return errNoNotify
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}
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Block a user