prototooth/adapter_nrf528xx.go

// +build softdevice,!s110v8

package bluetooth

/*
// Define SoftDevice functions as regular function declarations (not inline
// static functions).
#define SVCALL_AS_NORMAL_FUNCTION

#include "nrf_sdm.h"
#include "ble.h"
#include "ble_gap.h"

void assertHandler(void);
*/
import "C"

import "unsafe"

//export assertHandler
func assertHandler() {
	println("SoftDevice assert")
}

var clockConfig C.nrf_clock_lf_cfg_t = C.nrf_clock_lf_cfg_t{
	source:       C.NRF_CLOCK_LF_SRC_SYNTH,
	rc_ctiv:      0,
	rc_temp_ctiv: 0,
	accuracy:     0,
}

func (a *Adapter) enable() error {
	// Enable the SoftDevice.
	errCode := C.sd_softdevice_enable(&clockConfig, C.nrf_fault_handler_t(C.assertHandler))
	if errCode != 0 {
		return Error(errCode)
	}

	// Enable the BLE stack.
	appRAMBase := uint32(0x200039c0)
	errCode = C.sd_ble_enable(&appRAMBase)
	return makeError(errCode)
}

func handleEvent() {
	id := eventBuf.header.evt_id
	switch {
	case id >= C.BLE_GAP_EVT_BASE && id <= C.BLE_GAP_EVT_LAST:
		gapEvent := eventBuf.evt.unionfield_gap_evt()
		switch id {
		case C.BLE_GAP_EVT_CONNECTED:
			currentConnection.Reg = gapEvent.conn_handle
		case C.BLE_GAP_EVT_DISCONNECTED:
			if defaultAdvertisement.isAdvertising.Get() != 0 {
				// The advertisement was running but was automatically stopped
				// by the connection event.
				// Note that it cannot be restarted during connect like this,
				// because it would need to be reconfigured as a non-connectable
				// advertisement. That's left as a future addition, if
				// necessary.
				C.sd_ble_gap_adv_start(defaultAdvertisement.handle, C.BLE_CONN_CFG_TAG_DEFAULT)
			}
			currentConnection.Reg = C.BLE_CONN_HANDLE_INVALID
		case C.BLE_GAP_EVT_ADV_REPORT:
			advReport := gapEvent.params.unionfield_adv_report()
			if debug && &scanReportBuffer.data[0] != advReport.data.p_data {
				// Sanity check.
				panic("scanReportBuffer != advReport.p_data")
			}
			// Prepare the globalScanResult, which will be passed to the
			// callback.
			scanReportBuffer.len = byte(advReport.data.len)
			globalScanResult.RSSI = int16(advReport.rssi)
			globalScanResult.Address = advReport.peer_addr.addr
			globalScanResult.AdvertisementPayload = &scanReportBuffer
			// Signal to the main thread that there was a scan report.
			// Scanning will be resumed (from the main thread) once the scan
			// report has been processed.
			gotScanReport.Set(1)
		case C.BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
			// Respond with the default PPCP connection parameters by passing
			// nil:
			// > If NULL is provided on a peripheral role, the parameters in the
			// > PPCP characteristic of the GAP service will be used instead. If
			// > NULL is provided on a central role and in response to a
			// > BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST, the peripheral request
			// > will be rejected
			C.sd_ble_gap_conn_param_update(gapEvent.conn_handle, nil)
		case C.BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST:
			// We need to respond with sd_ble_gap_data_length_update. Setting
			// both parameters to nil will make sure we send the default values.
			C.sd_ble_gap_data_length_update(gapEvent.conn_handle, nil, nil)
		default:
			if debug {
				println("unknown GAP event:", id)
			}
		}
	case id >= C.BLE_GATTS_EVT_BASE && id <= C.BLE_GATTS_EVT_LAST:
		gattsEvent := eventBuf.evt.unionfield_gatts_evt()
		switch id {
		case C.BLE_GATTS_EVT_WRITE:
			writeEvent := gattsEvent.params.unionfield_write()
			len := writeEvent.len - writeEvent.offset
			data := (*[255]byte)(unsafe.Pointer(&writeEvent.data[0]))[:len:len]
			handler := DefaultAdapter.getCharWriteHandler(writeEvent.handle)
			if handler != nil {
				handler.callback(Connection(gattsEvent.conn_handle), int(writeEvent.offset), data)
			}
		case C.BLE_GATTS_EVT_SYS_ATTR_MISSING:
			// This event is generated when reading the Generic Attribute
			// service. It appears to be necessary for bonded devices.
			// From the docs:
			// > If the pointer is NULL, the system attribute info is
			// > initialized, assuming that the application does not have any
			// > previously saved system attribute data for this device.
			// Maybe we should look at the error, but as there's not really a
			// way to handle it, ignore it.
			C.sd_ble_gatts_sys_attr_set(gattsEvent.conn_handle, nil, 0, 0)
		case C.BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
			// This event is generated by some devices. While we could support
			// larger MTUs, this default MTU is supported everywhere.
			C.sd_ble_gatts_exchange_mtu_reply(gattsEvent.conn_handle, C.BLE_GATT_ATT_MTU_DEFAULT)
		default:
			if debug {
				println("unknown GATTS event:", id, id-C.BLE_GATTS_EVT_BASE)
			}
		}
	default:
		if debug {
			println("unknown event:", id)
		}
	}
}