2 FreeRTOS.org V5.1.1 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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30 * and even write all or part of your application on your behalf. *
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31 * See http://www.OpenRTOS.com for details of the services we provide to *
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32 * expedite your project. *
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34 ***************************************************************************
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35 ***************************************************************************
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37 Please ensure to read the configuration and relevant port sections of the
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38 online documentation.
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40 http://www.FreeRTOS.org - Documentation, latest information, license and
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43 http://www.SafeRTOS.com - A version that is certified for use in safety
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46 http://www.OpenRTOS.com - Commercial support, development, porting,
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47 licensing and training services.
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50 /* High speed timer test as described in main.c. */
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53 /* Scheduler includes. */
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54 #include "FreeRTOS.h"
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56 /* The maximum value the 16bit timer can contain. */
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57 #define timerMAX_COUNT 0xffff
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59 /* The timer 2 interrupt handler. */
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60 void __attribute__( (interrupt(ipl0), vector(_TIMER_2_VECTOR))) vT2InterruptWrapper( void );
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62 /*-----------------------------------------------------------*/
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64 /* Incremented every 20,000 interrupts, so should count in seconds. */
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65 unsigned portLONG ulHighFrequencyTimerInterrupts = 0;
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67 /* The frequency at which the timer is interrupting. */
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68 static unsigned portLONG ulFrequencyHz;
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70 /*-----------------------------------------------------------*/
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72 void vSetupTimerTest( unsigned portSHORT usFrequencyHz )
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74 /* Remember the frequency so it can be used from the ISR. */
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75 ulFrequencyHz = ( unsigned portLONG ) usFrequencyHz;
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77 /* T2 is used to generate interrupts above the kernel and max syscall interrupt
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82 /* Timer 2 is going to interrupt at usFrequencyHz Hz. */
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83 PR2 = ( unsigned portSHORT ) ( ( configPERIPHERAL_CLOCK_HZ / ( unsigned portLONG ) usFrequencyHz ) - 1 );
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85 /* Setup timer 2 interrupt priority to be above the kernel priority so
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86 the timer jitter is not effected by the kernel activity. */
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87 ConfigIntTimer2( T2_INT_ON | ( configMAX_SYSCALL_INTERRUPT_PRIORITY + 1 ) );
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89 /* Clear the interrupt as a starting condition. */
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92 /* Enable the interrupt. */
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95 /* Start the timer. */
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98 /*-----------------------------------------------------------*/
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100 void vT2InterruptHandler( void )
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102 static unsigned portLONG ulCalls = 0;
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105 if( ulCalls >= ulFrequencyHz )
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107 /* Increment the count that will be shown on the LCD.
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108 The increment occurs once every 20,000 interrupts so
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109 ulHighFrequencyTimerInterrupts should count in seconds. */
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110 ulHighFrequencyTimerInterrupts++;
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114 /* Clear the timer interrupt. */
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