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Use QLowEnergyController without QEventLoop

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We rather use wait in combination with spinning the event loop.

Signed-off-by: Alex Blasche <alexander.blasche@qt.io>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alex Blasche 2017-06-27 15:58:36 +02:00 • committed by Linus Torvalds
parent 57753321b0
commit e79bede0aa
1 changed files with 43 additions and 21 deletions
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64
core/qt-ble.cpp
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@ -3,7 +3,10 @@
#include <QtBluetooth/QBluetoothAddress>
#include <QLowEnergyController>
#include <QCoreApplication>
#include <QElapsedTimer>
#include <QEventLoop>
#include <QThread>
#include <QTimer>
#include <QDebug>
@ -18,6 +21,20 @@
extern "C" {
void waitFor(int ms) {
Q_ASSERT(QCoreApplication::instance());
Q_ASSERT(QThread::currentThread());
QElapsedTimer timer;
timer.start();
do {
QCoreApplication::processEvents(QEventLoop::AllEvents, ms);
QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
QThread::msleep(10);
} while (timer.elapsed() < ms);
}
void BLEObject::serviceStateChanged(QLowEnergyService::ServiceState s)
{
QList<QLowEnergyCharacteristic> list;
@ -144,21 +161,15 @@ dc_status_t qt_ble_open(dc_custom_io_t *io, dc_context_t *context, const char *d
qDebug() << "qt_ble_open(" << devaddr << ")";
// Wait until the connection succeeds or until an error occurs
QEventLoop loop;
loop.connect(controller, SIGNAL(connected()), SLOT(quit()));
loop.connect(controller, SIGNAL(error(QLowEnergyController::Error)), SLOT(quit()));
// Create a timer. If the connection doesn't succeed after five seconds or no error occurs then stop the opening step
QTimer timer;
int msec = 5000;
timer.setSingleShot(true);
loop.connect(&timer, SIGNAL(timeout()), SLOT(quit()));
// Try to connect to the device
controller->connectToDevice();
timer.start(msec);
loop.exec();
// Create a timer. If the connection doesn't succeed after five seconds or no error occurs then stop the opening step
int msec = 5000;
while (msec > 0 && controller->state() == QLowEnergyController::ConnectingState) {
waitFor(100);
msec -= 100;
};
switch (controller->state()) {
case QLowEnergyController::ConnectedState:
@ -174,24 +185,35 @@ dc_status_t qt_ble_open(dc_custom_io_t *io, dc_context_t *context, const char *d
/* We need to discover services etc here! */
BLEObject *ble = new BLEObject(controller);
loop.connect(controller, SIGNAL(discoveryFinished()), SLOT(quit()));
ble->connect(controller, SIGNAL(serviceDiscovered(QBluetoothUuid)), SLOT(addService(QBluetoothUuid)));
qDebug() << " .. discovering services";
controller->discoverServices();
timer.start(msec);
loop.exec();
msec = 5000;
while (msec > 0 && controller->state() == QLowEnergyController::DiscoveringState) {
waitFor(100);
msec -= 100;
};
qDebug() << " .. done discovering services";
if (ble->preferredService() == nullptr) {
qDebug() << "failed to find suitable service on" << devaddr;
report_error("Failed to find suitable service on '%s'", devaddr);
controller->disconnectFromDevice();
delete controller;
return DC_STATUS_IO;
}
qDebug() << " .. discovering details";
msec = 5000;
while (msec > 0 && ble->preferredService()->state() == QLowEnergyService::DiscoveringServices) {
waitFor(100);
msec -= 100;
};
timer.start(msec);
loop.exec();
qDebug() << " .. done waiting";
if (ble->preferredService() == nullptr) {
if (ble->preferredService()->state() != QLowEnergyService::ServiceDiscovered) {
qDebug() << "failed to find suitable service on" << devaddr;
report_error("Failed to find suitable service on '%s'", devaddr);
controller->disconnectFromDevice();