mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-12-09 05:05:17 -05:00
7d09b88e5a
The line 'Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.'
used to have two spaces between the first and second sentences.
This would cause the header check to fail due to the copyright regex located
ab999f9624/.github/scripts/core_checker.py (L396)
143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
/*
|
|
* FreeRTOS V202212.00
|
|
* 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.
|
|
*
|
|
* https://www.FreeRTOS.org
|
|
* https://github.com/FreeRTOS
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* High frequency timer test as described in main.c.
|
|
*/
|
|
|
|
/* Scheduler includes. */
|
|
#include "FreeRTOS.h"
|
|
|
|
/* Hardware specifics. */
|
|
#include "iodefine.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;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|