Fixed segfault; now displays message about iso failure too

Desktop_Interface/genericusbdriver.cpp

@@ -28,17 +28,29 @@ genericUsbDriver::genericUsbDriver(QWidget *parent) : QLabel(parent)
     connectTimer->start(USB_RECONNECT_PERIOD);
     connect(connectTimer, SIGNAL(timeout()), this, SLOT(checkConnection()));
     qDebug()<< "Generic Usb Driver setup complete";
+	messageBox = new QMessageBox();
 }
 
 genericUsbDriver::~genericUsbDriver(void){
     qDebug() << "genericUsbDriver dectructor entering";
     if(connected){
-        psuTimer->stop();
-        recoveryTimer->stop();
-        isoTimer->stop();
-        delete(psuTimer);
-        delete(recoveryTimer);
-        delete(isoTimer);
+		if (psuTimer)
+		{
+			psuTimer->stop();
+			delete(psuTimer);
+		}
+		
+		if (recoveryTimer)
+		{
+			recoveryTimer->stop();
+			delete(recoveryTimer);
+		}
+
+		if (isoTimer)
+		{
+			isoTimer->stop();
+			delete(isoTimer);
+		}
     }
     qDebug() << "genericUsbDriver dectructor completed";
 }
@@ -402,7 +414,13 @@ void genericUsbDriver::checkConnection(){
 
     setDeviceMode(deviceMode);
     newDig(digitalPinState);
-    usbIsoInit();
+
+    int ret = usbIsoInit();
+	if (ret != 0)
+	{
+        messageBox->setText("A USB connection was established, but isochronous communications could not be initialised.<br>This is usually due to bandwidth limitations on the current USB host and can be fixed by moving to a different port.<br>Please see <a href = 'https://github.com/EspoTek/Labrador/wiki/Troubleshooting-Guide#usb-connection-issues-other-platforms'>https://github.com/EspoTek/Labrador/wiki/Troubleshooting-Guide#usb-connection-issues-other-platforms</a>");
+        messageBox->exec();
+	}
 
     psuTimer = new QTimer();
     psuTimer->setTimerType(Qt::PreciseTimer);

Desktop_Interface/genericusbdriver.h

@@ -8,6 +8,7 @@
 #include <QThread>
 #include <math.h>
 #include <stdint.h>
+#include <QMessageBox>
 
 #include "functiongencontrol.h"
 #include "xmega.h"
@@ -83,10 +84,10 @@ protected:
     unsigned char variant = 0;
     //Generic Vars
     //bufferControl *bufferPtr = NULL;
-    QTimer *psuTimer;
+    QTimer *psuTimer = nullptr;
     unsigned char pipeID[3];
-    QTimer *isoTimer;
-    QTimer *connectTimer;
+    QTimer *isoTimer = nullptr;
+    QTimer *connectTimer = nullptr;
     QTimer *recoveryTimer;
     unsigned char currentWriteBuffer = 0;
     unsigned long timerCount = 0;
@@ -98,6 +99,7 @@ protected:
     virtual int usbIsoInit(void) = 0;
     virtual int flashFirmware(void) = 0;
     uint8_t numero_uno = 1;
+    QMessageBox *messageBox;
 signals:
     void sendClearBuffer(bool ch3751, bool ch3752, bool ch750);
     void setVisible_CH2(bool visible);

Desktop_Interface/mainwindow.h

@@ -216,6 +216,7 @@ private:
     int reinitDigitalPinState;
 
     QSettings *settings;
+	bool calibrationCanceled = false;
 
     //Generic Functions
     void initialisePlot();

Desktop_Interface/unixusbdriver.cpp

@@ -20,19 +20,24 @@ unixUsbDriver::~unixUsbDriver(void){
     qDebug() << "\n\nunixUsbDriver destructor ran!";
     //unixDriverDeleteMutex.lock();
     if(connected){
-        workerThread->deleteLater();
-        while(workerThread->isRunning()){
-            workerThread->quit();
-            qDebug() << "isRunning?" << workerThread->isFinished();
-            QThread::msleep(100);
-        }
-        delete(isoHandler);
+		if (workerThread)
+			{
+			workerThread->deleteLater();
+			while(workerThread->isRunning()){
+				workerThread->quit();
+				qDebug() << "isRunning?" << workerThread->isFinished();
+				QThread::msleep(100);
+			}
+		}	
+		if (isoHandler)
+	        delete(isoHandler);
         //delete(workerThread);
         qDebug() << "THREAD Gone!";
 
         for (int i=0; i<NUM_FUTURE_CTX; i++){
             for (int k=0; k<NUM_ISO_ENDPOINTS; k++){
-                libusb_free_transfer(isoCtx[k][i]);
+				if (isoCtx[k][i])
+	                libusb_free_transfer(isoCtx[k][i]);
             }
         }
         qDebug() << "Transfers freed.";
@@ -120,7 +125,7 @@ void unixUsbDriver::usbSendControl(uint8_t RequestType, uint8_t Request, uint16_
 
 int unixUsbDriver::usbIsoInit(void){
     int error;
-
+	
     for(int n=0;n<NUM_FUTURE_CTX;n++){
         for (unsigned char k=0;k<NUM_ISO_ENDPOINTS;k++){
             isoCtx[k][n] = libusb_alloc_transfer(ISO_PACKETS_PER_CTX);
@@ -311,7 +316,8 @@ void unixUsbDriver::shutdownProcedure(){
 
 //On physical disconnect, isoTimerTick will not assert stopTime.  Hence this duct-tape function.
 void unixUsbDriver::backupCleanup(){
-    isoHandler->stopTime = true;
+	if (isoHandler)
+	    isoHandler->stopTime = true;
 }
 
 int unixUsbDriver::flashFirmware(void){

Desktop_Interface/unixusbdriver.h

@@ -74,11 +74,11 @@ protected:
     unsigned char *midBuffer_current[NUM_ISO_ENDPOINTS];
     unsigned char *midBuffer_prev[NUM_ISO_ENDPOINTS];
     qint64 midBufferOffsets[NUM_ISO_ENDPOINTS];
-    libusb_transfer *isoCtx[NUM_ISO_ENDPOINTS][NUM_FUTURE_CTX];
+    libusb_transfer *isoCtx[NUM_ISO_ENDPOINTS][NUM_FUTURE_CTX] = { };
     tcBlock transferCompleted[NUM_ISO_ENDPOINTS][NUM_FUTURE_CTX];
     unsigned char dataBuffer[NUM_ISO_ENDPOINTS][NUM_FUTURE_CTX][ISO_PACKET_SIZE*ISO_PACKETS_PER_CTX];
-    worker *isoHandler;
-    QThread *workerThread;
+    worker *isoHandler = nullptr;
+    QThread *workerThread = nullptr;
     int cumulativeFramePhaseErrors = 0;
     //Generic Functions
     virtual unsigned char usbInit(unsigned long VIDin, unsigned long PIDin);

Desktop_Interface/winusbdriver.cpp

@@ -131,7 +131,7 @@ void winUsbDriver::usbSendControl(uint8_t RequestType, uint8_t Request, uint16_t
     }
 }
 
-unsigned char winUsbDriver::usbIsoInit(void){
+int  winUsbDriver::usbIsoInit(void){
     //Iso is slightly less easy than plain old USB.
     //You must set up NUM_FUTURE_CTX iso transfers, with each transfer containing ISO_PACKETS_PER_CTX isochronous packets.
     //These transactions are numbered by n = 0,1,2,3...NUM_FUTURE_CTX-1.  Transfer n should read data into dataBuffer[n].
@@ -148,14 +148,14 @@ unsigned char winUsbDriver::usbIsoInit(void){
     if(!success){
         errorCode = GetLastError();
         qDebug() << "OvlK_Init failed with error code" << errorCode;
-        return 0;
+        return -1;
     }
     for (unsigned char k=0;k<NUM_ISO_ENDPOINTS;k++){
         success = UsbK_ResetPipe(handle, pipeID[k]);
         if(!success){
             errorCode = GetLastError();
             qDebug() << "UsbK_ResetPipe failed with error code" << errorCode;
-            return 0;
+            return -2;
         }
     }
 
@@ -170,7 +170,7 @@ unsigned char winUsbDriver::usbIsoInit(void){
                 errorCode = GetLastError();
                 qDebug() << "IsoK_Init failed with error code" << errorCode;
                 qDebug() << "n =" << n;
-                return 0;
+                return -3;
             }
 
             success = IsoK_SetPackets(isoCtx[k][n], ISO_PACKET_SIZE);
@@ -178,7 +178,7 @@ unsigned char winUsbDriver::usbIsoInit(void){
                 errorCode = GetLastError();
                 qDebug() << "IsoK_SetPackets failed with error code" << errorCode;
                 qDebug() << "n =" << n;
-                return 0;
+                return -4;
             }
 
             success = OvlK_Acquire(&ovlkHandle[k][n], ovlPool);
@@ -186,7 +186,7 @@ unsigned char winUsbDriver::usbIsoInit(void){
                 errorCode = GetLastError();
                 qDebug() << "OvlK_Acquire failed with error code" << errorCode;
                 qDebug() << "n =" << n;
-                return 0;
+                return -5;
             }
 
             //Sending the transfer requests
@@ -202,7 +202,7 @@ unsigned char winUsbDriver::usbIsoInit(void){
     connect(isoTimer, SIGNAL(timeout()), this, SLOT(isoTimerTick()));
 
     qDebug() << "Setup successful!";
-    return 1;
+    return 0;
 }
 
 void winUsbDriver::isoTimerTick(void){

Desktop_Interface/winusbdriver.h

@@ -32,7 +32,7 @@ private:
     unsigned char dataBuffer[NUM_ISO_ENDPOINTS][NUM_FUTURE_CTX][ISO_PACKET_SIZE*ISO_PACKETS_PER_CTX];
     //Generic Functions
     unsigned char usbInit(unsigned long VIDin, unsigned long PIDin);
-    unsigned char usbIsoInit(void);
+    int usbIsoInit(void);
     int flashFirmware(void);
     bool allEndpointsComplete(int n);
 signals: