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gap_nrf51.go
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gap_nrf51.go
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//go:build softdevice && s110v8
// +build softdevice,s110v8
package bluetooth
/*
#include "ble_gap.h"
*/
import "C"
import (
"runtime/volatile"
"time"
)
// Address contains a Bluetooth MAC address.
type Address struct {
MACAddress
}
// Advertisement encapsulates a single advertisement instance.
type Advertisement struct {
interval Duration
isAdvertising volatile.Register8
}
var defaultAdvertisement Advertisement
// DefaultAdvertisement returns the default advertisement instance but does not
// configure it.
func (a *Adapter) DefaultAdvertisement() *Advertisement {
return &defaultAdvertisement
}
// Configure this advertisement.
func (a *Advertisement) Configure(options AdvertisementOptions) error {
// Fill empty options with reasonable defaults.
if options.Interval == 0 {
// Pick an advertisement interval recommended by Apple (section 35.5
// Advertising Interval):
// https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf
options.Interval = NewDuration(152500 * time.Microsecond) // 152.5ms
}
// Construct payload.
var payload rawAdvertisementPayload
if !payload.addFromOptions(options) {
return errAdvertisementPacketTooBig
}
errCode := C.sd_ble_gap_adv_data_set(&payload.data[0], payload.len, nil, 0)
a.interval = options.Interval
return makeError(errCode)
}
// Start advertisement. May only be called after it has been configured.
func (a *Advertisement) Start() error {
a.isAdvertising.Set(1)
errCode := a.start()
return makeError(errCode)
}
// Stop advertisement.
func (a *Advertisement) Stop() error {
a.isAdvertising.Set(0)
errCode := C.sd_ble_gap_adv_stop()
return makeError(errCode)
}
// Low-level version of Start. Used to restart advertisement when a connection
// is lost.
func (a *Advertisement) start() uint32 {
params := C.ble_gap_adv_params_t{
_type: C.BLE_GAP_ADV_TYPE_ADV_IND,
fp: C.BLE_GAP_ADV_FP_ANY,
interval: uint16(a.interval),
timeout: 0, // no timeout
}
return C.sd_ble_gap_adv_start(¶ms)
}