You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
180 lines
6.7 KiB
C
180 lines
6.7 KiB
C
/*
|
|
FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
|
|
All rights reserved
|
|
|
|
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
|
|
|
|
***************************************************************************
|
|
* *
|
|
* FreeRTOS provides completely free yet professionally developed, *
|
|
* robust, strictly quality controlled, supported, and cross *
|
|
* platform software that has become a de facto standard. *
|
|
* *
|
|
* Help yourself get started quickly and support the FreeRTOS *
|
|
* project by purchasing a FreeRTOS tutorial book, reference *
|
|
* manual, or both from: http://www.FreeRTOS.org/Documentation *
|
|
* *
|
|
* Thank you! *
|
|
* *
|
|
***************************************************************************
|
|
|
|
This file is part of the FreeRTOS distribution.
|
|
|
|
FreeRTOS is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License (version 2) as published by the
|
|
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
|
|
|
|
>>! NOTE: The modification to the GPL is included to allow you to !<<
|
|
>>! distribute a combined work that includes FreeRTOS without being !<<
|
|
>>! obliged to provide the source code for proprietary components !<<
|
|
>>! outside of the FreeRTOS kernel. !<<
|
|
|
|
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. Full license text is available from the following
|
|
link: http://www.freertos.org/a00114.html
|
|
|
|
1 tab == 4 spaces!
|
|
|
|
***************************************************************************
|
|
* *
|
|
* Having a problem? Start by reading the FAQ "My application does *
|
|
* not run, what could be wrong?" *
|
|
* *
|
|
* http://www.FreeRTOS.org/FAQHelp.html *
|
|
* *
|
|
***************************************************************************
|
|
|
|
http://www.FreeRTOS.org - Documentation, books, training, latest versions,
|
|
license and Real Time Engineers Ltd. contact details.
|
|
|
|
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
|
|
including FreeRTOS+Trace - an indispensable productivity tool, a DOS
|
|
compatible FAT file system, and our tiny thread aware UDP/IP stack.
|
|
|
|
http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
|
|
Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
|
|
licenses offer ticketed support, indemnification and middleware.
|
|
|
|
http://www.SafeRTOS.com - High Integrity Systems also provide a safety
|
|
engineered and independently SIL3 certified version for use in safety and
|
|
mission critical applications that require provable dependability.
|
|
|
|
1 tab == 4 spaces!
|
|
*/
|
|
|
|
/*
|
|
* High frequency timer test as described in main.c.
|
|
*/
|
|
|
|
/* Scheduler includes. */
|
|
#include "FreeRTOS.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 ( ( unsigned short ) ( ( configPERIPHERAL_CLOCK_HZ / 8UL ) / timerINTERRUPT_FREQUENCY ) )
|
|
|
|
/* The highest available interrupt priority. */
|
|
#define timerHIGHEST_PRIORITY ( 15 )
|
|
|
|
/* Misc defines. */
|
|
#define timerTIMER_3_COUNT_VALUE ( *( ( unsigned short * ) 0x8801a ) ) /*( CMT3.CMCNT )*/
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/* Interrupt handler in which the jitter is measured. */
|
|
static void prvTimer2IntHandler( void );
|
|
|
|
/* Stores the value of the maximum recorded jitter between interrupts. This is
|
|
displayed on one of the served web pages. */
|
|
volatile unsigned short usMaxJitter = 0;
|
|
|
|
/* Counts the number of high frequency interrupts - used to generate the run
|
|
time stats. */
|
|
volatile unsigned long ulHighFrequencyTickCount = 0UL;
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vSetupHighFrequencyTimer( void )
|
|
{
|
|
/* Timer CMT2 is used to generate the interrupts, and CMT3 is used
|
|
to measure the jitter. */
|
|
|
|
/* Enable compare match timer 2 and 3. */
|
|
MSTP( CMT2 ) = 0;
|
|
MSTP( CMT3 ) = 0;
|
|
|
|
/* Interrupt on compare match. */
|
|
CMT2.CMCR.BIT.CMIE = 1;
|
|
|
|
/* Set the compare match value. */
|
|
CMT2.CMCOR = ( unsigned short ) ( ( ( configPERIPHERAL_CLOCK_HZ / timerINTERRUPT_FREQUENCY ) -1 ) / 8 );
|
|
|
|
/* Divide the PCLK by 8. */
|
|
CMT2.CMCR.BIT.CKS = 0;
|
|
CMT3.CMCR.BIT.CKS = 0;
|
|
|
|
/* Enable the interrupt... */
|
|
_IEN( _CMT2_CMI2 ) = 1;
|
|
|
|
/* ...and set its priority to the maximum possible, this is above the priority
|
|
set by configMAX_SYSCALL_INTERRUPT_PRIORITY so will nest. */
|
|
_IPR( _CMT2_CMI2 ) = timerHIGHEST_PRIORITY;
|
|
|
|
/* Start the timers. */
|
|
CMT.CMSTR1.BIT.STR2 = 1;
|
|
CMT.CMSTR1.BIT.STR3 = 1;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#pragma interrupt ( prvTimer2IntHandler( vect = _VECT( _CMT2_CMI2 ), enable ) )
|
|
static void prvTimer2IntHandler( void )
|
|
{
|
|
volatile unsigned short usCurrentCount;
|
|
static unsigned short usMaxCount = 0;
|
|
static unsigned long ulErrorCount = 0UL;
|
|
|
|
/* We use the timer 1 counter value to measure the clock cycles between
|
|
the timer 0 interrupts. First stop the clock. */
|
|
CMT.CMSTR1.BIT.STR3 = 0;
|
|
nop();
|
|
nop();
|
|
usCurrentCount = timerTIMER_3_COUNT_VALUE;
|
|
|
|
/* Is this the largest count we have measured yet? */
|
|
if( usCurrentCount > usMaxCount )
|
|
{
|
|
if( usCurrentCount > timerEXPECTED_DIFFERENCE_VALUE )
|
|
{
|
|
usMaxJitter = usCurrentCount - timerEXPECTED_DIFFERENCE_VALUE;
|
|
}
|
|
else
|
|
{
|
|
/* This should not happen! */
|
|
ulErrorCount++;
|
|
}
|
|
|
|
usMaxCount = usCurrentCount;
|
|
}
|
|
|
|
/* Used to generate the run time stats. */
|
|
ulHighFrequencyTickCount++;
|
|
|
|
/* Clear the timer. */
|
|
timerTIMER_3_COUNT_VALUE = 0;
|
|
|
|
/* Then start the clock again. */
|
|
CMT.CMSTR1.BIT.STR3 = 1;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|