add more error strings

src/PRDevice.cpp

@@ -816,8 +816,10 @@ PRResult PRDevice::SwitchGetStates( PREventType * switchStates, uint16_t numSwit
     {
         PRSleep (10); // 10 milliseconds should be plenty of time.
 		if (SortReturningData() != kPRSuccess)
+		{
 			return kPRFailure;
         }
+    }
 
     // Make sure all of the requested words are available before processing them.
     // Too many words is just as bad as not enough words.
@@ -851,7 +853,11 @@ PRResult PRDevice::SwitchGetStates( PREventType * switchStates, uint16_t numSwit
         }
         return kPRSuccess;
     }
-    else return kPRFailure;
+    else
+    {
+        PRSetLastErrorText("Switch response length does not match.");
+        return kPRFailure;
+    }
 }
 
 int32_t PRDevice::DMDUpdateConfig(PRDMDConfig *dmdConfig)
@@ -1093,6 +1099,7 @@ PRResult PRDevice::VerifyChipID()
                 DEBUG(PRLog(kPRLogError, "Error in VerifyID(): Dumping buffer\n"));
                 for (i = 0; i < bufferWords; i++)
                     DEBUG(PRLog(kPRLogError, "buffer[%d]: 0x%x\n", i, buffer[i]));
+                PRSetLastErrorText("Chip ID does not match.");
                 rc = kPRFailure;
             }
             else rc = kPRSuccess;
@@ -1111,6 +1118,7 @@ PRResult PRDevice::VerifyChipID()
         }
         else {
             DEBUG(PRLog(kPRLogError, "Error reading Chip IP and Version. Read %d words instead of 5. The first 2 were: 0x%x and 0x%x.\n", requestedDataQueue.size(), buffer[0], buffer[1]));
+            PRSetLastErrorText("Error reading Chip IP and Version. Read %d words instead of 5. The first 2 were: 0x%x and 0x%x.", requestedDataQueue.size(), buffer[0], buffer[1]);
             rc = kPRFailure;
         }
     }
@@ -1118,6 +1126,7 @@ PRResult PRDevice::VerifyChipID()
     {
         // Return failure without logging; calling function must log.
         DEBUG(PRLog(kPRLogError, "Verify Chip ID took too long to receive data\n"));
+        PRSetLastErrorText("Verify Chip ID took too long to receive data");
         rc = kPRFailure;
     }
     return (rc);
@@ -1253,7 +1262,11 @@ PRResult PRDevice::ReadDataRaw(uint32_t moduleSelect, uint32_t startingAddr, int
         }
         return kPRSuccess;
     }
-    else return kPRFailure;
+    else
+    {
+        PRSetLastErrorText("Response length did not match.");
+        return kPRFailure;
+    }
 }
 
 
@@ -1282,6 +1295,7 @@ int32_t PRDevice::ReadData(uint32_t *buffer, int32_t num_words)
         rc = num_words;
     }
     else {
+        PRSetLastErrorText("Read length did not match.");
         rc = 0;
     }
     DEBUG(PRLog(kPRLogVerbose, "Read num bytes: %d\n", rc));

src/PRHardware.cpp

@@ -389,6 +389,7 @@ PRResult PRHardwareOpen()
     ftStatus = FT_ListDevices(pcBufLD, &iNumDevs, FT_LIST_ALL | FT_OPEN_BY_SERIAL_NUMBER);
 
     if(ftStatus != FT_OK) {
+        PRSetLastErrorText("FT_ListDevices(%d)\n", ftStatus);
         DEBUG(PRLog(kPRLogInfo,"Error: FT_ListDevices(%d)\n", ftStatus));
         return kPRFailure;
     }
@@ -410,6 +411,7 @@ PRResult PRHardwareOpen()
                 also rmmod usbserial
             */
             DEBUG(PRLog(kPRLogInfo,"Error FT_OpenEx(%d), device\n", ftStatus, i));
+            PRSetLastErrorText("Error FT_OpenEx(%d), device\n", ftStatus, i);
             return kPRFailure;
         }
 
@@ -429,7 +431,11 @@ PRResult PRHardwareOpen()
       DEBUG(PRLog(kPRLogInfo,"FTDI Device Opened\n"));
       return kPRSuccess;
     }
-    else return kPRFailure;
+    else
+    {
+        PRSetLastErrorText("No FTDI device found.");
+        return kPRFailure;
+    }
 }
 
 void PRHardwareClose()