/*\r
- FreeRTOS.org V4.7.2 - Copyright (C) 2003-2008 Richard Barry.\r
-\r
- This file is part of the FreeRTOS.org distribution.\r
-\r
- FreeRTOS.org is free software; you can redistribute it and/or modify\r
- it under the terms of the GNU General Public License as published by\r
- the Free Software Foundation; either version 2 of the License, or\r
- (at your option) any later version.\r
-\r
- FreeRTOS.org is distributed in the hope that it will be useful,\r
- but WITHOUT ANY WARRANTY; without even the implied warranty of\r
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
- GNU General Public License for more details.\r
-\r
- You should have received a copy of the GNU General Public License\r
- along with FreeRTOS.org; if not, write to the Free Software\r
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r
-\r
- A special exception to the GPL can be applied should you wish to distribute\r
- a combined work that includes FreeRTOS.org, without being obliged to provide\r
- the source code for any proprietary components. See the licensing section \r
- of http://www.FreeRTOS.org for full details of how and when the exception\r
- can be applied.\r
-\r
- ***************************************************************************\r
-\r
- Please ensure to read the configuration and relevant port sections of the \r
- online documentation.\r
-\r
- +++ http://www.FreeRTOS.org +++\r
- Documentation, latest information, license and contact details. \r
-\r
- +++ http://www.SafeRTOS.com +++\r
- A version that is certified for use in safety critical systems.\r
-\r
- +++ http://www.OpenRTOS.com +++\r
- Commercial support, development, porting, licensing and training services.\r
-\r
- ***************************************************************************\r
+ FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.\r
+ \r
+\r
+ ***************************************************************************\r
+ * *\r
+ * FreeRTOS tutorial books are available in pdf and paperback. *\r
+ * Complete, revised, and edited pdf reference manuals are also *\r
+ * available. *\r
+ * *\r
+ * Purchasing FreeRTOS documentation will not only help you, by *\r
+ * ensuring you get running as quickly as possible and with an *\r
+ * in-depth knowledge of how to use FreeRTOS, it will also help *\r
+ * the FreeRTOS project to continue with its mission of providing *\r
+ * professional grade, cross platform, de facto standard solutions *\r
+ * for microcontrollers - completely free of charge! *\r
+ * *\r
+ * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *\r
+ * *\r
+ * Thank you for using FreeRTOS, and thank you for your support! *\r
+ * *\r
+ ***************************************************************************\r
+\r
+\r
+ This file is part of the FreeRTOS distribution.\r
+\r
+ FreeRTOS is free software; you can redistribute it and/or modify it under\r
+ the terms of the GNU General Public License (version 2) as published by the\r
+ Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
+ >>>NOTE<<< The modification to the GPL is included to allow you to\r
+ distribute a combined work that includes FreeRTOS without being obliged to\r
+ provide the source code for proprietary components outside of the FreeRTOS\r
+ kernel. FreeRTOS is distributed in the hope that it will be useful, but\r
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\r
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\r
+ more details. You should have received a copy of the GNU General Public\r
+ License and the FreeRTOS license exception along with FreeRTOS; if not it\r
+ can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
+ by writing to Richard Barry, contact details for whom are available on the\r
+ FreeRTOS WEB site.\r
+\r
+ 1 tab == 4 spaces!\r
+ \r
+ ***************************************************************************\r
+ * *\r
+ * Having a problem? Start by reading the FAQ "My application does *\r
+ * not run, what could be wrong? *\r
+ * *\r
+ * http://www.FreeRTOS.org/FAQHelp.html *\r
+ * *\r
+ ***************************************************************************\r
+\r
+ \r
+ http://www.FreeRTOS.org - Documentation, training, latest information, \r
+ license and contact details.\r
+ \r
+ http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
+ including FreeRTOS+Trace - an indispensable productivity tool.\r
+\r
+ Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell \r
+ the code with commercial support, indemnification, and middleware, under \r
+ the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also\r
+ provide a safety engineered and independently SIL3 certified version under \r
+ the SafeRTOS brand: http://www.SafeRTOS.com.\r
*/\r
\r
/* High speed timer test as described in main.c. */\r
/* Scheduler includes. */\r
#include "FreeRTOS.h"\r
\r
-/* Demo includes. */\r
-#include "partest.h"\r
-\r
-/* The number of interrupts to pass before we start looking at the jitter. */\r
-#define timerSETTLE_TIME 200\r
-\r
/* The maximum value the 16bit timer can contain. */\r
#define timerMAX_COUNT 0xffff\r
\r
+/* The timer 2 interrupt handler. As this interrupt uses the FreeRTOS assembly\r
+entry point the IPL setting in the following function prototype has no effect.\r
+The interrupt priority is set by ConfigIntTimer2() in vSetupTimerTest(). */\r
+void __attribute__( (interrupt(ipl0), vector(_TIMER_2_VECTOR))) vT2InterruptWrapper( void );\r
\r
/*-----------------------------------------------------------*/\r
\r
-/* The maximum time (in processor clocks) between two consecutive timer\r
-interrupts so far. */\r
-unsigned portLONG ulMaxJitter = 0;\r
+/* Incremented every 20,000 interrupts, so should count in seconds. */\r
+unsigned long ulHighFrequencyTimerInterrupts = 0;\r
+\r
+/* The frequency at which the timer is interrupting. */\r
+static unsigned long ulFrequencyHz;\r
\r
/*-----------------------------------------------------------*/\r
\r
-void vSetupTimerTest( unsigned portSHORT usFrequencyHz )\r
+void vSetupTimerTest( unsigned short usFrequencyHz )\r
{\r
- /* T2 is used to generate interrupts. The core timer is used to provide an \r
- accurate time measurement. */\r
+ /* Remember the frequency so it can be used from the ISR. */\r
+ ulFrequencyHz = ( unsigned long ) usFrequencyHz;\r
+\r
+ /* T2 is used to generate interrupts above the kernel and max syscall interrupt\r
+ priority. */\r
T2CON = 0;\r
TMR2 = 0;\r
\r
/* Timer 2 is going to interrupt at usFrequencyHz Hz. */\r
- PR2 = ( unsigned portSHORT ) ( configPERIPHERAL_CLOCK_HZ / ( unsigned portLONG ) usFrequencyHz );\r
+ PR2 = ( unsigned short ) ( ( configPERIPHERAL_CLOCK_HZ / ( unsigned long ) usFrequencyHz ) - 1 );\r
\r
/* Setup timer 2 interrupt priority to be above the kernel priority so \r
the timer jitter is not effected by the kernel activity. */\r
- ConfigIntTimer2( T2_INT_ON | ( configKERNEL_INTERRUPT_PRIORITY + 1 ) );\r
+ ConfigIntTimer2( T2_INT_ON | ( configMAX_SYSCALL_INTERRUPT_PRIORITY + 1 ) );\r
\r
/* Clear the interrupt as a starting condition. */\r
IFS0bits.T2IF = 0;\r
}\r
/*-----------------------------------------------------------*/\r
\r
-void __attribute__( (interrupt(ipl0), vector(_TIMER_2_VECTOR))) vT2InterruptHandler( void );\r
void vT2InterruptHandler( void )\r
{\r
-static unsigned portLONG ulLastCount = 0, ulSettleCount = 0;\r
-static unsigned portLONG ulThisCount, ulDifference;\r
+static unsigned long ulCalls = 0;\r
\r
- /* Capture the timer value as we enter the interrupt. */\r
- ulThisCount = _CP0_GET_COUNT();\r
-\r
- if( ulSettleCount >= timerSETTLE_TIME )\r
- {\r
- /* What is the difference between the timer value in this interrupt\r
- and the value from the last interrupt. */\r
- ulDifference = ulThisCount - ulLastCount;\r
-\r
- /* Store the difference in the timer values if it is larger than the\r
- currently stored largest value. The difference over and above the \r
- expected difference will give the 'jitter' in the processing of these\r
- interrupts. */\r
- if( ulDifference > ulMaxJitter )\r
- {\r
- ulMaxJitter = ulDifference;\r
- }\r
- }\r
- else\r
+ ++ulCalls;\r
+ if( ulCalls >= ulFrequencyHz )\r
{\r
- /* Don't bother storing any values for the first couple of \r
- interrupts. */\r
- ulSettleCount++;\r
+ /* Increment the count that will be shown on the LCD. \r
+ The increment occurs once every 20,000 interrupts so\r
+ ulHighFrequencyTimerInterrupts should count in seconds. */\r
+ ulHighFrequencyTimerInterrupts++;\r
+ ulCalls = 0;\r
}\r
\r
- /* Remember what the timer value was this time through, so we can calculate\r
- the difference the next time through. */\r
- ulLastCount = ulThisCount;\r
-\r
/* Clear the timer interrupt. */\r
- IFS0bits.T2IF = 0;\r
+ IFS0CLR = _IFS0_T2IF_MASK;\r
}\r
\r
\r
projects / freertos / blobdiff