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.
125 lines
5.2 KiB
C
125 lines
5.2 KiB
C
/*
|
|
FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
|
|
|
|
***************************************************************************
|
|
* *
|
|
* If you are: *
|
|
* *
|
|
* + New to FreeRTOS, *
|
|
* + Wanting to learn FreeRTOS or multitasking in general quickly *
|
|
* + Looking for basic training, *
|
|
* + Wanting to improve your FreeRTOS skills and productivity *
|
|
* *
|
|
* then take a look at the FreeRTOS books - available as PDF or paperback *
|
|
* *
|
|
* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
|
|
* http://www.FreeRTOS.org/Documentation *
|
|
* *
|
|
* A pdf reference manual is also available. Both are usually delivered *
|
|
* to your inbox within 20 minutes to two hours when purchased between 8am *
|
|
* and 8pm GMT (although please allow up to 24 hours in case of *
|
|
* exceptional circumstances). Thank you for your support! *
|
|
* *
|
|
***************************************************************************
|
|
|
|
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 exception 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. See the GNU General Public License for
|
|
more details. You should have received a copy of the GNU General Public
|
|
License and the FreeRTOS license exception along with FreeRTOS; if not it
|
|
can be viewed here: http://www.freertos.org/a00114.html and also obtained
|
|
by writing to Richard Barry, contact details for whom are available on the
|
|
FreeRTOS WEB site.
|
|
|
|
1 tab == 4 spaces!
|
|
|
|
http://www.FreeRTOS.org - Documentation, latest information, license and
|
|
contact details.
|
|
|
|
http://www.SafeRTOS.com - A version that is certified for use in safety
|
|
critical systems.
|
|
|
|
http://www.OpenRTOS.com - Commercial support, development, porting,
|
|
licensing and training services.
|
|
*/
|
|
|
|
/* High speed timer test as described in main.c. */
|
|
|
|
|
|
/* Scheduler includes. */
|
|
#include "FreeRTOS.h"
|
|
|
|
/* The maximum value the 16bit timer can contain. */
|
|
#define timerMAX_COUNT 0xffff
|
|
|
|
/* The timer 2 interrupt handler. As this interrupt uses the FreeRTOS assembly
|
|
entry point the IPL setting in the following function prototype has no effect.
|
|
The interrupt priority is set by ConfigIntTimer2() in vSetupTimerTest(). */
|
|
void __attribute__( (interrupt(ipl0), vector(_TIMER_2_VECTOR))) vT2InterruptWrapper( void );
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/* Incremented every 20,000 interrupts, so should count in seconds. */
|
|
unsigned long ulHighFrequencyTimerInterrupts = 0;
|
|
|
|
/* The frequency at which the timer is interrupting. */
|
|
static unsigned long ulFrequencyHz;
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vSetupTimerTest( unsigned short usFrequencyHz )
|
|
{
|
|
/* Remember the frequency so it can be used from the ISR. */
|
|
ulFrequencyHz = ( unsigned long ) usFrequencyHz;
|
|
|
|
/* T2 is used to generate interrupts above the kernel and max syscall interrupt
|
|
priority. */
|
|
T2CON = 0;
|
|
TMR2 = 0;
|
|
|
|
/* Timer 2 is going to interrupt at usFrequencyHz Hz. */
|
|
PR2 = ( unsigned short ) ( ( configPERIPHERAL_CLOCK_HZ / ( unsigned long ) usFrequencyHz ) - 1 );
|
|
|
|
/* Setup timer 2 interrupt priority to be above the kernel priority so
|
|
the timer jitter is not effected by the kernel activity. */
|
|
ConfigIntTimer2( T2_INT_ON | ( configMAX_SYSCALL_INTERRUPT_PRIORITY + 1 ) );
|
|
|
|
/* Clear the interrupt as a starting condition. */
|
|
IFS0bits.T2IF = 0;
|
|
|
|
/* Enable the interrupt. */
|
|
IEC0bits.T2IE = 1;
|
|
|
|
/* Start the timer. */
|
|
T2CONbits.TON = 1;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vT2InterruptHandler( void )
|
|
{
|
|
static unsigned long ulCalls = 0;
|
|
|
|
++ulCalls;
|
|
if( ulCalls >= ulFrequencyHz )
|
|
{
|
|
/* Increment the count that will be shown on the LCD.
|
|
The increment occurs once every 20,000 interrupts so
|
|
ulHighFrequencyTimerInterrupts should count in seconds. */
|
|
ulHighFrequencyTimerInterrupts++;
|
|
ulCalls = 0;
|
|
}
|
|
|
|
/* Clear the timer interrupt. */
|
|
IFS0bits.T2IF = 0;
|
|
}
|
|
|
|
|