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139 lines
4.8 KiB
C
139 lines
4.8 KiB
C
/*
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* FreeRTOS Kernel V10.1.1
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* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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/* High speed timer test as described in main.c. */
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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/* Library includes. */
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#include "hw_ints.h"
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#include "hw_memmap.h"
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#include "hw_types.h"
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#include "interrupt.h"
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#include "sysctl.h"
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#include "lmi_timer.h"
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/* The set frequency of the interrupt. Deviations from this are measured as
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the jitter. */
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#define timerINTERRUPT_FREQUENCY ( 20000UL )
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/* The expected time between each of the timer interrupts - if the jitter was
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zero. */
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#define timerEXPECTED_DIFFERENCE_VALUE ( configCPU_CLOCK_HZ / timerINTERRUPT_FREQUENCY )
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/* The highest available interrupt priority. */
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#define timerHIGHEST_PRIORITY ( 0 )
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/* Misc defines. */
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#define timerMAX_32BIT_VALUE ( 0xffffffffUL )
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#define timerTIMER_1_COUNT_VALUE ( * ( ( unsigned long * ) ( TIMER1_BASE + 0x48 ) ) )
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/*-----------------------------------------------------------*/
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/* Interrupt handler in which the jitter is measured. */
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void Timer0IntHandler( void );
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/* Stores the value of the maximum recorded jitter between interrupts. */
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volatile unsigned long ulMaxJitter = 0UL;
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/* Counts the total number of times that the high frequency timer has 'ticked'.
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This value is used by the run time stats function to work out what percentage
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of CPU time each task is taking. */
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volatile unsigned long ulHighFrequencyTimerTicks = 0UL;
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/*-----------------------------------------------------------*/
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void vSetupHighFrequencyTimer( void )
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{
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unsigned long ulFrequency;
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/* Timer zero is used to generate the interrupts, and timer 1 is used
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to measure the jitter. */
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SysCtlPeripheralEnable( SYSCTL_PERIPH_TIMER0 );
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SysCtlPeripheralEnable( SYSCTL_PERIPH_TIMER1 );
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TimerConfigure( TIMER0_BASE, TIMER_CFG_32_BIT_PER );
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TimerConfigure( TIMER1_BASE, TIMER_CFG_32_BIT_PER );
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/* Set the timer interrupt to be above the kernel - highest. */
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IntPrioritySet( INT_TIMER0A, timerHIGHEST_PRIORITY );
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/* Just used to measure time. */
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TimerLoadSet(TIMER1_BASE, TIMER_A, timerMAX_32BIT_VALUE );
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/* Ensure interrupts do not start until the scheduler is running. */
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portDISABLE_INTERRUPTS();
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/* The rate at which the timer will interrupt. */
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ulFrequency = configCPU_CLOCK_HZ / timerINTERRUPT_FREQUENCY;
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TimerLoadSet( TIMER0_BASE, TIMER_A, ulFrequency );
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IntEnable( INT_TIMER0A );
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TimerIntEnable( TIMER0_BASE, TIMER_TIMA_TIMEOUT );
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/* Enable both timers. */
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TimerEnable( TIMER0_BASE, TIMER_A );
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TimerEnable( TIMER1_BASE, TIMER_A );
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}
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/*-----------------------------------------------------------*/
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void Timer0IntHandler( void )
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{
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unsigned long ulDifference;
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volatile unsigned long ulCurrentCount;
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static unsigned long ulMaxDifference = 0, ulLastCount = 0;
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/* We use the timer 1 counter value to measure the clock cycles between
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the timer 0 interrupts. */
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ulCurrentCount = timerTIMER_1_COUNT_VALUE;
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TimerIntClear( TIMER0_BASE, TIMER_TIMA_TIMEOUT );
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if( ulCurrentCount < ulLastCount )
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{
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/* How many times has timer 1 counted since the last interrupt? */
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ulDifference = ulLastCount - ulCurrentCount;
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/* Is this the largest difference we have measured yet? */
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if( ulDifference > ulMaxDifference )
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{
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ulMaxDifference = ulDifference;
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ulMaxJitter = ulMaxDifference - timerEXPECTED_DIFFERENCE_VALUE;
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}
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}
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ulLastCount = ulCurrentCount;
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/* Keep a count of the total number of 20KHz ticks. This is used by the
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run time stats functionality to calculate how much CPU time is used by
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each task. */
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ulHighFrequencyTimerTicks++;
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}
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