diff --git a/examples/pinproctest/pinproctest.cpp b/examples/pinproctest/pinproctest.cpp
index 257b2e7..ccc707b 100644
--- a/examples/pinproctest/pinproctest.cpp
+++ b/examples/pinproctest/pinproctest.cpp
@@ -71,6 +71,49 @@ PRResult LoadConfiguration(YAML::Node& yamlDoc, const char *yamlFilePath)
 }
 
 
+#define drawdot(subFrame) dots[subFrame*(kDMDColumns*kDMDRows/8) + ((row*kDMDColumns+col)/8)] |= 1 << (col % 8)
+unsigned char frame[kDMDColumns*kDMDRows] = {0xff};
+void UpdateDots2(unsigned char *dots, unsigned int dotOffset)
+{
+    int row, col;
+    memset(dots, 0x00, 4*kDMDColumns*kDMDRows/8);
+    
+    if (1) //frame[0] == 0xff)
+    {
+        //FILE *f = fopen("../../../../DMDAnimator/Gir Robot.dmd", "rb");
+        //FILE *f = fopen("../../../../DMDAnimator/Invader Zim.dmd", "rb");
+        FILE *f = NULL;
+        switch((dotOffset / 100) % 4)
+        {
+            case 0: f = fopen("../../../../DMDAnimator/Gir.dmd", "rb"); break;
+            case 1: f = fopen("../../../../DMDAnimator/Invader Zim.dmd", "rb"); break;
+            case 2: f = fopen("../../../../DMDAnimator/Gir Robot.dmd", "rb"); break;
+            case 3: f = fopen("../../../../DMDAnimator/Gnomes.dmd", "rb"); break;
+        }
+        int n;
+        n = fread(frame, 1, 1, f);
+        n = fread(frame, 1, sizeof(frame), f);
+        fclose(f);
+    }
+    
+    for (row = kDMDRows - 1; row >= 0; row--)
+    {
+        // Loop through each of 16 bytes in a row
+        for (col = 0; col < kDMDColumns; col++)
+        {
+            int dot = frame[row * kDMDColumns + col];
+            switch (dot)
+            {
+                case 0:
+                    break;
+                case 1: drawdot(0); break;
+                case 2: drawdot(0); drawdot(2); break;
+                case 3: drawdot(0); drawdot(1); drawdot(2); drawdot(3); break;
+            }
+        }
+    }
+}
+
 time_t startTime;
 bool runLoopRun = true;
 
@@ -89,7 +132,7 @@ void RunLoop(PRHandle proc)
         PRDriverWatchdogTickle(proc);
          
         // Create a dot pattern to test the DMD
-        UpdateDots(dots,dotOffset++);
+        UpdateDots2(dots,dotOffset++);
         PRDMDDraw(proc,dots);
 
         int numEvents = PRGetEvents(proc, events, maxEvents);
@@ -159,7 +202,10 @@ int main(int argc, const char **argv)
     // Finally instantiate the P-ROC device:
     PRHandle proc = PRCreate(machineType);
     if (proc == kPRHandleInvalid)
+    {
+        fprintf(stderr, "Error during PRCreate: %s\n", PRGetLastErrorText());
         return 1;
+    }
     
     PRReset(proc, kPRResetFlagUpdateDevice); // Reset the device structs and write them into the device.
     
diff --git a/include/pinproc.h b/include/pinproc.h
index 8f8c3e0..ccaf50b 100644
--- a/include/pinproc.h
+++ b/include/pinproc.h
@@ -77,12 +77,14 @@ typedef enum PRLogLevel {
     kPRLogWarning,
     kPRLogError
 } PRLogLevel;
-    
+
 typedef void (*PRLogCallback)(PRLogLevel level, const char *text); /**< Function pointer type for a custom logging callback.  See: PRLogSetCallback(). */
 PR_EXPORT void PRLogSetCallback(PRLogCallback callback); /**< Replaces the default logging handler with the given callback function. */
 
 PR_EXPORT void PRLogSetLevel(PRLogLevel level);
 
+PR_EXPORT const char *PRGetLastErrorText();
+
 /** 
  * @defgroup device Device Creation & Deletion
  * @{
diff --git a/src/PRCommon.h b/src/PRCommon.h
index 6548ff8..b3a541f 100644
--- a/src/PRCommon.h
+++ b/src/PRCommon.h
@@ -31,6 +31,7 @@
 #  define DEBUG(block) block
 #endif
 
-extern void PRLog(PRLogLevel level, const char *format, ...);
+void PRLog(PRLogLevel level, const char *format, ...);
+void PRSetLastErrorText(const char *format, ...);
 
 #endif // _PRCOMMON_H_
diff --git a/src/PRDevice.cpp b/src/PRDevice.cpp
index cf13cc2..b4a2163 100644
--- a/src/PRDevice.cpp
+++ b/src/PRDevice.cpp
@@ -199,7 +199,7 @@ PRResult PRDevice::DriverUpdateState(PRDriverState *driverState)
 
     if (driverState->polarity != drivers[driverState->driverNum].polarity && machineType != kPRMachineCustom)
     {
-        DEBUG(PRLog(kPRLogError, "Refusing to update driver #%d; polarity differs on non-custom machine.\n", driverState->driverNum));
+        PRSetLastErrorText("Refusing to update driver #%d; polarity differs on non-custom machine.", driverState->driverNum);
         return kPRFailure;
     }
 
@@ -256,7 +256,7 @@ PRResult PRDevice::SwitchUpdateRule(uint8_t switchNum, PREventType eventType, PR
     
     if (switchNum > kPRSwitchPhysicalLast) // Always true due to data type.
     {
-        DEBUG(PRLog(kPRLogError, "Switch rule out of range 0-%d\n", kPRSwitchPhysicalLast));
+        PRSetLastErrorText("Switch rule out of range 0-%d", kPRSwitchPhysicalLast);
         return kPRFailure;
     }
 
@@ -264,7 +264,7 @@ PRResult PRDevice::SwitchUpdateRule(uint8_t switchNum, PREventType eventType, PR
     // the links.
     if (numDrivers > 0 && freeSwitchRuleIndexes.size() < numDrivers-1) // -1 because the first switch rule holds the first driver.
     {
-        DEBUG(PRLog(kPRLogError, "Not enough free switch rule indexes: %d available, need %d\n", freeSwitchRuleIndexes.size(), numDrivers));
+        PRSetLastErrorText("Not enough free switch rule indexes: %d available, need %d", freeSwitchRuleIndexes.size(), numDrivers);
         return kPRFailure;
     }
 
@@ -500,7 +500,7 @@ PRResult PRDevice::PrepareWriteData(uint32_t * words, int32_t numWords)
 {
     if (numWords > maxWriteWords)
     { 
-        DEBUG(PRLog(kPRLogError, "%d words Exceeds write capabilities.  Restrict write requests to %d words.", numWords, maxWriteWords));
+        PRSetLastErrorText("%d words Exceeds write capabilities.  Restrict write requests to %d words.", numWords, maxWriteWords);
         return kPRFailure;
     }
 
@@ -509,7 +509,7 @@ PRResult PRDevice::PrepareWriteData(uint32_t * words, int32_t numWords)
     if (numPreparedWriteWords + numWords > maxWriteWords)
     {
         if (FlushWriteData() == kPRFailure);
-        return kPRFailure;
+            return kPRFailure;
     }
 
     memcpy(preparedWriteWords + numPreparedWriteWords, words, numWords * 4);
@@ -557,7 +557,7 @@ PRResult PRDevice::WriteData(uint32_t * words, int32_t numWords)
 
     if (bytesWritten != bytesToWrite)
     {
-        DEBUG(PRLog(kPRLogError, "Error in WriteData: wrote %d of %d bytes\n", bytesWritten, bytesToWrite));
+        PRSetLastErrorText("Error in WriteData: wrote %d of %d bytes", bytesWritten, bytesToWrite);
         return kPRFailure;
     }
     else
diff --git a/src/PRHardware.cpp b/src/PRHardware.cpp
index d878560..3460012 100644
--- a/src/PRHardware.cpp
+++ b/src/PRHardware.cpp
@@ -264,7 +264,7 @@ PRResult PRHardwareOpen()
     // Open the FTDI device
     if (ftdi_init(&ftdic) != 0)
     {
-        DEBUG(PRLog(kPRLogError, "Failed to initialize FTDI.\n"));
+        PRSetLastErrorText("Failed to initialize FTDI.");
         return kPRFailure;
     }
     
@@ -278,7 +278,7 @@ PRResult PRHardwareOpen()
     // We first enumerate all of the devices:
     int numDevices = ftdi_usb_find_all(&ftdic, &devlist, FTDI_VENDOR_ID, FTDI_FT245RL_PRODUCT_ID);
     if (numDevices < 0) {
-        DEBUG(PRLog(kPRLogError, "ftdi_usb_find_all failed: %d: %s\n", numDevices, ftdi_get_error_string(&ftdic)));
+        PRSetLastErrorText("ftdi_usb_find_all failed: %d: %s", numDevices, ftdi_get_error_string(&ftdic));
         ftdi_deinit(&ftdic);
         return kPRFailure;
     }
@@ -305,7 +305,7 @@ PRResult PRHardwareOpen()
     
     if ((rc = (int32_t)ftdi_usb_open(&ftdic, FTDI_VENDOR_ID, FTDI_FT245RL_PRODUCT_ID)) < 0)
     {
-        DEBUG(PRLog(kPRLogError, "ERROR: Unable to open ftdi device: %d: %s\n", rc, ftdi_get_error_string(&ftdic)));
+        PRSetLastErrorText("Unable to open ftdi device: %d: %s", rc, ftdi_get_error_string(&ftdic));
         return kPRFailure;
     }
     else
@@ -323,7 +323,7 @@ PRResult PRHardwareOpen()
         }
         else
         {
-            DEBUG(PRLog(kPRLogError, "FTDI type != TYPE_R: 0x%x\n", ftdic.type));
+            PRSetLastErrorText("FTDI type != TYPE_R: 0x%x", ftdic.type);
             return kPRFailure;
         }
     }
diff --git a/src/pinproc.cpp b/src/pinproc.cpp
index 9c2e39d..d8bb823 100644
--- a/src/pinproc.cpp
+++ b/src/pinproc.cpp
@@ -31,6 +31,8 @@
 #include "../include/pinproc.h"
 #include "PRDevice.h"
 
+#define MAX_TEXT (1024)
+
 typedef void (*PRLogCallback)(PRLogLevel level, const char *text);
 
 PRLogCallback logCallback = NULL;
@@ -41,11 +43,10 @@ void PRLog(PRLogLevel level, const char *format, ...)
     if (level < logLevel)
         return;
     
-    const int maxLogLineLength = 1024;
-    char line[maxLogLineLength];
+    char line[MAX_TEXT];
     va_list ap;
     va_start(ap, format);
-    vsnprintf(line, maxLogLineLength, format, ap);
+    vsnprintf(line, MAX_TEXT, format, ap);
     if (logCallback)
         logCallback(level, line);
     else
@@ -62,6 +63,21 @@ void PRLogSetLevel(PRLogLevel level)
     logLevel = level;
 }
 
+char lastErrorText[MAX_TEXT];
+
+void PRSetLastErrorText(const char *format, ...)
+{
+    va_list ap;
+    va_start(ap, format);
+    vsnprintf(lastErrorText, MAX_TEXT, format, ap);
+    PRLog(kPRLogError, "%s\n", lastErrorText);
+}
+
+PR_EXPORT const char *PRGetLastErrorText()
+{
+    return lastErrorText;
+}
+
 #define handleAsDevice ((PRDevice*)handle)
 
 /** Create a new P-ROC device handle.  Only one handle per device may be created. This handle must be destroyed with PRDelete() when it is no longer needed. */