mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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146 lines
6.9 KiB
C
146 lines
6.9 KiB
C
/*
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FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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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 distribute
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>>! a combined work that includes FreeRTOS without being obliged to provide
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>>! the source code for proprietary components outside of the FreeRTOS
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>>! 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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#include "FreeRTOS.h"
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#include "task.h"
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/* Constants used to configure the interrupts. */
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#define portPRESCALE_VALUE 64
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#define portPRESCALE_REG_SETTING ( 5 << 8 )
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#define portPIT_INTERRUPT_ENABLED ( 0x08 )
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#define configPIT0_INTERRUPT_VECTOR ( 55 )
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/*
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* FreeRTOS.org requires two interrupts - a tick interrupt generated from a
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* timer source, and a spare interrupt vector used for context switching.
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* The configuration below uses PIT0 for the former, and vector 16 for the
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* latter. **IF YOUR APPLICATION HAS BOTH OF THESE INTERRUPTS FREE THEN YOU DO
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* NOT NEED TO CHANGE ANY OF THIS CODE** - otherwise instructions are provided
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* here for using alternative interrupt sources.
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*
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* To change the tick interrupt source:
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*
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* 1) Modify vApplicationSetupInterrupts() below to be correct for whichever
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* peripheral is to be used to generate the tick interrupt.
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*
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* 2) Change the name of the function __cs3_isr_interrupt_119() defined within
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* this file to be correct for the interrupt vector used by the timer peripheral.
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* The name of the function should contain the vector number, so by default vector
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* number 119 is being used.
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*
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* 3) Make sure the tick interrupt is cleared within the interrupt handler function.
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* Currently __cs3_isr_interrupt_119() clears the PIT0 interrupt.
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*
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* To change the spare interrupt source:
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*
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* 1) Modify vApplicationSetupInterrupts() below to be correct for whichever
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* interrupt vector is to be used. Make sure you use a spare interrupt on interrupt
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* controller 0, otherwise the register used to request context switches will also
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* require modification. By default vector 16 is used which is free on most MCF52xxx
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* devices.
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*
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* 2) Change the definition of configYIELD_INTERRUPT_VECTOR within FreeRTOSConfig.h
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* to be correct for your chosen interrupt vector.
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*
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* 3) Change the name of the function __cs3_isr_interrupt_80() within portasm.S
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* to be correct for whichever vector number is being used. By default interrupt
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* controller 0 vector number 16 is used, which corresponds to vector number 80.
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*/
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void vApplicationSetupInterrupts( void )
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{
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const unsigned portSHORT usCompareMatchValue = ( ( configCPU_CLOCK_HZ / portPRESCALE_VALUE ) / configTICK_RATE_HZ );
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/* Configure interrupt priority and level and unmask interrupt for PIT0. */
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MCF_INTC0_ICR55 = ( 1 | ( configKERNEL_INTERRUPT_PRIORITY << 3 ) );
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MCF_INTC0_IMRH &= ~( MCF_INTC_IMRH_INT_MASK55 );
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/* Do the same for vector 16 (interrupt controller 0). I don't think the
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write to MCF_INTC0_IMRH is actually required here but is included for
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completeness. */
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MCF_INTC0_ICR16 = ( 0 | ( configKERNEL_INTERRUPT_PRIORITY << 3 ) );
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MCF_INTC0_IMRH &= ~( MCF_INTC_IPRL_INT16 );
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/* Configure PIT0 to generate the RTOS tick. */
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MCF_PIT0_PCSR |= MCF_PIT_PCSR_PIF;
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MCF_PIT0_PCSR = ( portPRESCALE_REG_SETTING | MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD | MCF_PIT_PCSR_EN );
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MCF_PIT0_PMR = usCompareMatchValue;
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}
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/*-----------------------------------------------------------*/
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void __attribute__ ((interrupt)) __cs3_isr_interrupt_119( void )
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{
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unsigned portLONG ulSavedInterruptMask;
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/* Clear the PIT0 interrupt. */
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MCF_PIT0_PCSR |= MCF_PIT_PCSR_PIF;
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/* Increment the RTOS tick. */
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ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
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if( xTaskIncrementTick() != pdFALSE )
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{
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taskYIELD();
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}
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portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
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}
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