1 files changed, 132 insertions, 0 deletions
diff --git a/FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/LocalDemoFiles/timertest.c b/FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/LocalDemoFiles/timertest.c
new file mode 100644
index 000000000..5d7a60ce4
--- /dev/null
+++ b/FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/LocalDemoFiles/timertest.c
@@ -0,0 +1,132 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+/* High speed timer test as described in main.c. */
+
+/* Scheduler includes. */
+#include "FreeRTOS.h"
+
+/* Library includes. */
+#include "hw_ints.h"
+#include "hw_memmap.h"
+#include "hw_types.h"
+#include "interrupt.h"
+#include "sysctl.h"
+#include "lmi_timer.h"
+#include "hw_timer.h"
+
+/* The set frequency of the interrupt.  Deviations from this are measured as
+the jitter. */
+#define timerINTERRUPT_FREQUENCY		( 20000UL )
+
+/* The expected time between each of the timer interrupts - if the jitter was
+zero. */
+#define timerEXPECTED_DIFFERENCE_VALUE	( configCPU_CLOCK_HZ / timerINTERRUPT_FREQUENCY )
+
+/* The highest available interrupt priority. */
+#define timerHIGHEST_PRIORITY			( 0 )
+
+/* Misc defines. */
+#define timerMAX_32BIT_VALUE			( 0xffffffffUL )
+#define timerTIMER_1_COUNT_VALUE		( * ( ( volatile uint32_t * ) ( ( uint32_t ) TIMER1_BASE + 0x48UL ) ) )
+
+/*-----------------------------------------------------------*/
+
+/* Interrupt handler in which the jitter is measured. */
+void Timer0IntHandler( void );
+
+/* Stores the value of the maximum recorded jitter between interrupts. */
+volatile uint32_t ulMaxJitter = 0;
+
+/*-----------------------------------------------------------*/
+
+void vSetupHighFrequencyTimer( void )
+{
+uint32_t ulFrequency;
+
+	/* Timer zero is used to generate the interrupts, and timer 1 is used
+	to measure the jitter. */
+	SysCtlPeripheralEnable( SYSCTL_PERIPH_TIMER0 );
+    SysCtlPeripheralEnable( SYSCTL_PERIPH_TIMER1 );
+    TimerConfigure( TIMER0_BASE, TIMER_CFG_32_BIT_PER );
+    TimerConfigure( TIMER1_BASE, TIMER_CFG_32_BIT_PER );
+	
+	/* Set the timer interrupt to be above the kernel - highest. */
+	IntPrioritySet( INT_TIMER0A, timerHIGHEST_PRIORITY );
+
+	/* Just used to measure time. */
+    TimerLoadSet(TIMER1_BASE, TIMER_A, timerMAX_32BIT_VALUE );
+	
+	/* Ensure interrupts do not start until the scheduler is running. */
+	portDISABLE_INTERRUPTS();
+	
+	/* The rate at which the timer will interrupt. */
+	ulFrequency = configCPU_CLOCK_HZ / timerINTERRUPT_FREQUENCY;	
+    TimerLoadSet( TIMER0_BASE, TIMER_A, ulFrequency );
+    IntEnable( INT_TIMER0A );
+    TimerIntEnable( TIMER0_BASE, TIMER_TIMA_TIMEOUT );
+
+	/* Enable both timers. */	
+    TimerEnable( TIMER0_BASE, TIMER_A );
+    TimerEnable( TIMER1_BASE, TIMER_A );
+}
+/*-----------------------------------------------------------*/
+
+void Timer0IntHandler( void )
+{
+uint32_t ulDifference;
+volatile uint32_t ulCurrentCount;
+static uint32_t ulMaxDifference = 0, ulLastCount = 0;
+
+	/* We use the timer 1 counter value to measure the clock cycles between
+	the timer 0 interrupts. */
+	ulCurrentCount = timerTIMER_1_COUNT_VALUE;
+
+	TimerIntClear( TIMER0_BASE, TIMER_TIMA_TIMEOUT );
+
+	if( ulCurrentCount < ulLastCount )
+	{	
+		/* How many times has timer 1 counted since the last interrupt? */
+		ulDifference = 	ulLastCount - ulCurrentCount;
+	
+		/* Is this the largest difference we have measured yet? */
+		if( ulDifference > ulMaxDifference )
+		{
+			ulMaxDifference = ulDifference;
+			ulMaxJitter = ulMaxDifference - timerEXPECTED_DIFFERENCE_VALUE;
+		}
+	}
+	
+	ulLastCount = ulCurrentCount;
+}
+
+
+
+
+
+
+