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