Update to latest FreeRTOS+Trace recorder code.

FreeRTOS-Plus/Source/FreeRTOS-Plus-Trace/trcHardwarePort.c

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+/******************************************************************************* 
+ * Tracealyzer v2.4.1 Recorder Library
+ * Percepio AB, www.percepio.com
+ *
+ * trcHardwarePort.c
+ *
+ * Contains together with trcHardwarePort.h all hardware portability issues of 
+ * the trace recorder library.
+ *
+ * Terms of Use
+ * This software is copyright Percepio AB. The recorder library is free for
+ * use together with Percepio products. You may distribute the recorder library
+ * in its original form, including modifications in trcPort.c and trcPort.h
+ * given that these modification are clearly marked as your own modifications
+ * and documented in the initial comment section of these source files. 
+ * This software is the intellectual property of Percepio AB and may not be 
+ * sold or in other ways commercially redistributed without explicit written 
+ * permission by Percepio AB.
+ *
+ * Disclaimer 
+ * The trace tool and recorder library is being delivered to you AS IS and 
+ * Percepio AB makes no warranty as to its use or performance. Percepio AB does 
+ * not and cannot warrant the performance or results you may obtain by using the 
+ * software or documentation. Percepio AB make no warranties, express or 
+ * implied, as to noninfringement of third party rights, merchantability, or 
+ * fitness for any particular purpose. In no event will Percepio AB, its 
+ * technology partners, or distributors be liable to you for any consequential, 
+ * incidental or special damages, including any lost profits or lost savings, 
+ * even if a representative of Percepio AB has been advised of the possibility 
+ * of such damages, or for any claim by any third party. Some jurisdictions do 
+ * not allow the exclusion or limitation of incidental, consequential or special 
+ * damages, or the exclusion of implied warranties or limitations on how long an 
+ * implied warranty may last, so the above limitations may not apply to you.
+ *
+ * Copyright Percepio AB, 2013.
+ * www.percepio.com
+ ******************************************************************************/
+
+#include "trcHardwarePort.h"
+
+#if (USE_TRACEALYZER_RECORDER == 1)
+
+#include <stdint.h>
+
+
+/*******************************************************************************
+ * uiTraceTickCount
+ *
+ * This variable is should be updated by the Kernel tick interrupt. This does 
+ * not need to be modified when developing a new timer port. It is preferred to 
+ * keep any timer port changes in the HWTC macro definitions, which typically 
+ * give sufficient flexibility.
+ ******************************************************************************/
+uint32_t uiTraceTickCount = 0;
+
+/******************************************************************************
+ * vTracePortGetTimeStamp
+ *
+ * Returns the current time based on the HWTC macros which provide a hardware
+ * isolation layer towards the hardware timer/counter.
+ *
+ * The HWTC macros and vTracePortGetTimeStamp is the main porting issue
+ * or the trace recorder library. Typically you should not need to change
+ * the code of vTracePortGetTimeStamp if using the HWTC macros.
+ *
+ ******************************************************************************/
+void vTracePortGetTimeStamp(uint32_t *pTimestamp)
+{
+	static uint32_t last_traceTickCount = 0;
+    static uint32_t last_hwtc_count = 0;
+    uint32_t traceTickCount = 0;
+    uint32_t hwtc_count = 0;
+    
+    /* Retrieve HWTC_COUNT only once since the same value should be used all throughout this function. */
+#if (HWTC_COUNT_DIRECTION == DIRECTION_INCREMENTING)
+    hwtc_count = HWTC_COUNT;
+#elif (HWTC_COUNT_DIRECTION == DIRECTION_DECREMENTING)
+    hwtc_count = HWTC_PERIOD - HWTC_COUNT;
+#else
+    Junk text to cause compiler error - HWTC_COUNT_DIRECTION is not set correctly!
+    Should be DIRECTION_INCREMENTING or DIRECTION_DECREMENTING
+#endif
+    
+    if (last_traceTickCount - uiTraceTickCount - 1 < 0x80000000)
+    {
+        /* This means last_traceTickCount is higher than uiTraceTickCount,
+        so we have previously compensated for a missed tick.
+        Therefore we use the last stored value because that is more accurate. */
+        traceTickCount = last_traceTickCount;
+    }
+    else
+    {
+        /* Business as usual */
+        traceTickCount = uiTraceTickCount;
+    }
+
+    /* Check for overflow. May occur if the update of uiTraceTickCount has been 
+    delayed due to disabled interrupts. */
+    if (traceTickCount == last_traceTickCount && hwtc_count < last_hwtc_count)
+    {
+        /* A trace tick has occurred but not been executed by the kernel, so we compensate manually. */
+        traceTickCount++;
+    }
+    
+    /* Check if the return address is OK, then we perform the calculation. */
+    if (pTimestamp)
+    {
+        /* Get timestamp from trace ticks. Scale down the period to avoid unwanted overflows. */
+        *pTimestamp = traceTickCount * (HWTC_PERIOD / HWTC_DIVISOR);
+        /* Increase timestamp by (hwtc_count + "lost hardware ticks from scaling down period") / HWTC_DIVISOR. */
+        *pTimestamp += (hwtc_count + traceTickCount * (HWTC_PERIOD % HWTC_DIVISOR)) / HWTC_DIVISOR;
+    }
+    
+    /* Store the previous values. */
+    last_traceTickCount = traceTickCount;
+    last_hwtc_count = hwtc_count;
+}
+
+#endif