mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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144 lines
6.7 KiB
C
144 lines
6.7 KiB
C
/*
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FreeRTOS V9.0.0rc1 - Copyright (C) 2016 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
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>>! NOTE: The modification to the GPL is included to allow you to !<<
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>>! distribute a combined work that includes FreeRTOS without being !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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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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/* System port includes */
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#include "appcfg.h"
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#include "platform.h"
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#include "MEC14xx/mec14xx.h"
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#include "MEC14xx/mec14xx_girqs.h"
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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/* The priority of the high speed timer interrupt. */
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#define timerTEST_INT_PRIORITY ( 7 )
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/* MEC14xx Timer 3 Timer MMCR's */
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#define portMMCR_TMR3_COUNT *((volatile uint32_t *)(0xA0000C60ul))
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#define portMMCR_TMR3_PRELOAD *((volatile uint32_t *)(0xA0000C64ul))
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#define portMMCR_TMR3_STATUS *((volatile uint32_t *)(0xA0000C68ul))
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#define portMMCR_TMR3_INTEN *((volatile uint32_t *)(0xA0000C6Cul))
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#define portMMCR_TMR3_CONTROL *((volatile uint32_t *)(0xA0000C70ul))
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/* MEC14xx JTVIC external interrupt controller
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* is mapped to M14K closely-coupled peripheral space.
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*/
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#define portGIRQ23_TMR3_TIMER_BITPOS (3)
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#define portGIRQ23_TMR3_TIMER_MASK (1ul << (portGIRQ23_TMR3_TIMER_BITPOS))
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#define portMMCR_JTVIC_GIRQ23_SRC *((volatile uint32_t *)(0xBFFFC0F0ul))
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#define portMMCR_JTVIC_GIRQ23_SETEN *((volatile uint32_t *)(0xBFFFC0F4ul))
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#define portMMCR_JTVIC_GIRQ23_PRIA *((volatile uint32_t *)(0xBFFFC3F0ul))
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/*-----------------------------------------------------------*/
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/* Incremented every 20,000 interrupts, so should count in seconds. */
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unsigned long ulHighFrequencyTimerInterrupts = 0;
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/*-----------------------------------------------------------*/
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void vSetupTimerTest( unsigned short usFrequencyHz )
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{
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/* Timer 3 is going to interrupt at usFrequencyHz Hz. */
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const uint32_t ulPreload = ( unsigned short ) ( ( configPERIPHERAL_CLOCK_HZ / ( unsigned long ) usFrequencyHz ) - 1 );
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/* Timer 3 is used to generate interrupts above the kernel and max syscall
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interrupt priorities. No system library calls are used here as they are not
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guaranteed to be re-entrant. */
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portMMCR_TMR3_CONTROL = 1ul;
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portMMCR_TMR3_PRELOAD = ulPreload;
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portMMCR_TMR3_COUNT = ulPreload;
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portMMCR_TMR3_INTEN = 0x0001ul;
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portMMCR_TMR3_STATUS = 0x0001ul;
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/* Enable Timer 3, and set for auto restart, counting down. */
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portMMCR_TMR3_CONTROL |= 0x0008;
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portMMCR_TMR3_CONTROL |= 0x0020;
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/* Configure interrupts from the Timer 3. */
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portMMCR_JTVIC_GIRQ23_SRC = ( portGIRQ23_TMR3_TIMER_MASK );
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portMMCR_JTVIC_GIRQ23_PRIA &= ~( 0x0Ful << 12 );
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portMMCR_JTVIC_GIRQ23_PRIA |= ( ( portIPL_TO_CODE( timerTEST_INT_PRIORITY ) ) << 12 );
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portMMCR_JTVIC_GIRQ23_SETEN = ( portGIRQ23_TMR3_TIMER_MASK );
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}
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/*-----------------------------------------------------------*/
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/* Interrupt handler for Timer 3 interrupts, no library functions are used
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here as they may not be re-entrant. */
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void __attribute__((interrupt, nomips16)) girq23_b3( void )
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{
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ulHighFrequencyTimerInterrupts++;
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/* The interrupt flag registered is shared with the lower priority timer
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interrupts and the RTOS timer so disable interrupts here. This is not
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strictly necessary since this is the highest priority interrupt. */
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__asm volatile( "di" );
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/* Clear the timer interrupt. */
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portMMCR_JTVIC_GIRQ23_SRC = portGIRQ23_TMR3_TIMER_MASK;
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__asm volatile( "ei" );
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}
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