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adapter_hci.go
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/
adapter_hci.go
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//go:build hci || ninafw || cyw43439
package bluetooth
import (
"runtime"
"time"
)
// hciAdapter represents the implementation for the connection to the HCI controller.
type hciAdapter struct {
hciport hciTransport
hci *hci
att *att
isDefault bool
scanning bool
connectHandler func(device Device, connected bool)
connectedDevices []Device
notificationsStarted bool
charWriteHandlers []charWriteHandler
}
func (a *hciAdapter) enable() error {
if err := a.hci.start(); err != nil {
if debug {
println("error starting HCI:", err.Error())
}
return err
}
if err := a.hci.reset(); err != nil {
if debug {
println("error resetting HCI:", err.Error())
}
return err
}
time.Sleep(150 * time.Millisecond)
if err := a.hci.setEventMask(0x3FFFFFFFFFFFFFFF); err != nil {
return err
}
return a.hci.setLeEventMask(0x00000000000003FF)
}
func (a *hciAdapter) Address() (MACAddress, error) {
if err := a.hci.readBdAddr(); err != nil {
return MACAddress{}, err
}
return MACAddress{MAC: makeAddress(a.hci.address)}, nil
}
func newBLEStack(port hciTransport) (*hci, *att) {
h := newHCI(port)
a := newATT(h)
h.att = a
l := newL2CAP(h)
h.l2cap = l
return h, a
}
// Convert a NINA MAC address into a Go MAC address.
func makeAddress(mac [6]uint8) MAC {
return MAC{
uint8(mac[0]),
uint8(mac[1]),
uint8(mac[2]),
uint8(mac[3]),
uint8(mac[4]),
uint8(mac[5]),
}
}
// Convert a Go MAC address into a NINA MAC Address.
func makeNINAAddress(mac MAC) [6]uint8 {
return [6]uint8{
uint8(mac[0]),
uint8(mac[1]),
uint8(mac[2]),
uint8(mac[3]),
uint8(mac[4]),
uint8(mac[5]),
}
}
func (a *hciAdapter) startNotifications() {
if a.notificationsStarted {
return
}
if debug {
println("starting notifications...")
}
a.notificationsStarted = true
// go routine to poll for HCI events for ATT notifications
go func() {
for {
if err := a.att.poll(); err != nil {
// TODO: handle error
if debug {
println("error polling for notifications:", err.Error())
}
}
time.Sleep(5 * time.Millisecond)
}
}()
// go routine to handle characteristic notifications
go func() {
for {
select {
case not := <-a.att.notifications:
if debug {
println("notification received", not.connectionHandle, not.handle, not.data)
}
d := a.findConnection(not.connectionHandle)
if d.deviceInternal == nil {
if debug {
println("no device found for handle", not.connectionHandle)
}
continue
}
n := d.findNotificationRegistration(not.handle)
if n == nil {
if debug {
println("no notification registered for handle", not.handle)
}
continue
}
if n.callback != nil {
n.callback(not.data)
}
default:
}
runtime.Gosched()
}
}()
}
func (a *hciAdapter) addConnection(d Device) {
a.connectedDevices = append(a.connectedDevices, d)
}
func (a *hciAdapter) removeConnection(d Device) {
for i := range a.connectedDevices {
if d.handle == a.connectedDevices[i].handle {
a.connectedDevices[i] = a.connectedDevices[len(a.connectedDevices)-1]
a.connectedDevices[len(a.connectedDevices)-1] = Device{}
a.connectedDevices = a.connectedDevices[:len(a.connectedDevices)-1]
return
}
}
}
func (a *hciAdapter) findConnection(handle uint16) Device {
for _, d := range a.connectedDevices {
if d.handle == handle {
if debug {
println("found device", handle, d.Address.String(), "with notifications registered", len(d.notificationRegistrations))
}
return d
}
}
return Device{}
}
// charWriteHandler contains a handler->callback mapping for characteristic
// writes.
type charWriteHandler struct {
handle uint16
callback func(connection Connection, offset int, value []byte)
}
// getCharWriteHandler returns a characteristic write handler if one matches the
// handle, or nil otherwise.
func (a *Adapter) getCharWriteHandler(handle uint16) *charWriteHandler {
for i := range a.charWriteHandlers {
h := &a.charWriteHandlers[i]
if h.handle == handle {
return h
}
}
return nil
}