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https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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Make CM3/4 tick configuration a weak function to allow application writers to use an alternative tick source.
This commit is contained in:
Richard Barry
parent
5e7c99d2aa
commit
ba686260ca
9 changed files with 338 additions and 214 deletions
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@ -1,7 +1,7 @@
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/*
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FreeRTOS V7.3.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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@ -42,7 +42,7 @@
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FreeRTOS WEB site.
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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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@ -52,17 +52,17 @@
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, training, latest versions, license
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and contact details.
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http://www.FreeRTOS.org - Documentation, training, latest versions, license
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and 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.
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Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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the code with commercial support, indemnification, and middleware, under
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Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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the code with commercial support, indemnification, and middleware, under
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the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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provide a safety engineered and independently SIL3 certified version under
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provide a safety engineered and independently SIL3 certified version under
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the SafeRTOS brand: http://www.SafeRTOS.com.
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*/
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@ -70,6 +70,9 @@
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* Implementation of functions defined in portable.h for the ARM CM4F port.
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*----------------------------------------------------------*/
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/* Compiler includes. */
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#include <intrinsics.h>
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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@ -84,15 +87,7 @@
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#ifndef configSYSTICK_CLOCK_HZ
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#define configSYSTICK_CLOCK_HZ configCPU_CLOCK_HZ
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#if configUSE_TICKLESS_IDLE == 1
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static const unsigned long ulStoppedTimerCompensation = 45UL;
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#endif
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#else /* configSYSTICK_CLOCK_HZ */
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#if configUSE_TICKLESS_IDLE == 1
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/* Assumes the SysTick clock is slower than the CPU clock. */
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static const unsigned long ulStoppedTimerCompensation = 45UL / ( configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ );
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#endif
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#endif /* configSYSTICK_CLOCK_HZ */
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#endif
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/* Constants required to manipulate the core. Registers first... */
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#define portNVIC_SYSTICK_CTRL_REG ( * ( ( volatile unsigned long * ) 0xe000e010 ) )
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@ -125,9 +120,11 @@ variable. */
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static unsigned portBASE_TYPE uxCriticalNesting = 0xaaaaaaaa;
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/*
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* Setup the timer to generate the tick interrupts.
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* Setup the timer to generate the tick interrupts. The implementation in this
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* file is weak to allow application writers to change the timer used to
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* generate the tick interrupt.
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*/
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static void prvSetupTimerInterrupt( void );
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void vPortSetupTimerInterrupt( void );
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/*
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* Exception handlers.
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@ -149,7 +146,9 @@ extern void vPortEnableVFP( void );
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/*
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* The number of SysTick increments that make up one tick period.
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*/
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static unsigned long ulTimerReloadValueForOneTick = 0;
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#if configUSE_TICKLESS_IDLE == 1
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static unsigned long ulTimerReloadValueForOneTick = 0;
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#endif
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/*
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* The maximum number of tick periods that can be suppressed is limited by the
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@ -159,6 +158,14 @@ static unsigned long ulTimerReloadValueForOneTick = 0;
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static unsigned long xMaximumPossibleSuppressedTicks = 0;
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#endif /* configUSE_TICKLESS_IDLE */
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/*
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* Compensate for the CPU cycles that pass while the SysTick is stopped (low
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* power functionality only.
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*/
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#if configUSE_TICKLESS_IDLE == 1
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static unsigned long ulStoppedTimerCompensation = 0;
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#endif /* configUSE_TICKLESS_IDLE */
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/*-----------------------------------------------------------*/
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/*
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@ -205,7 +212,7 @@ portBASE_TYPE xPortStartScheduler( void )
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/* Start the timer that generates the tick ISR. Interrupts are disabled
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here already. */
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prvSetupTimerInterrupt();
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vPortSetupTimerInterrupt();
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/* Initialise the critical nesting count ready for the first task. */
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uxCriticalNesting = 0;
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@ -262,6 +269,10 @@ void xPortSysTickHandler( void )
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portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
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#endif
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/* Only reset the systick load register if configUSE_TICKLESS_IDLE is set to
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1. If it is set to 0 tickless idle is not being used. If it is set to a
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value other than 0 or 1 then a timer other than the SysTick is being used
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to generate the tick interrupt. */
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#if configUSE_TICKLESS_IDLE == 1
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portNVIC_SYSTICK_LOAD_REG = ulTimerReloadValueForOneTick;
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#endif
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@ -325,9 +336,12 @@ void xPortSysTickHandler( void )
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portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
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/* Sleep until something happens. */
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configPRE_SLEEP_PROCESSING();
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__WFI();
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configPOST_SLEEP_PROCESSING();
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configPRE_SLEEP_PROCESSING( xExpectedIdleTime );
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if( xExpectedIdleTime > 0 )
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{
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__WFI();
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}
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configPOST_SLEEP_PROCESSING( xExpectedIdleTime );
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/* Stop SysTick. Again, the time the SysTick is stopped for is
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accounted for as best it can be, but using the tickless mode will
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@ -382,16 +396,19 @@ void xPortSysTickHandler( void )
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* Setup the systick timer to generate the tick interrupts at the required
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* frequency.
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*/
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void prvSetupTimerInterrupt( void )
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__weak void vPortSetupTimerInterrupt( void )
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{
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/* Configure the constants required to setup the tick interrupt. */
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ulTimerReloadValueForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
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/* Calculate the constants required to configure the tick interrupt. */
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#if configUSE_TICKLESS_IDLE == 1
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{
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ulTimerReloadValueForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
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xMaximumPossibleSuppressedTicks = 0xffffffUL / ( ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL );
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ulStoppedTimerCompensation = 45UL / ( configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ );
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}
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#endif /* configUSE_TICKLESS_IDLE */
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/* Configure SysTick to interrupt at the requested rate. */
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portNVIC_SYSTICK_LOAD_REG = ulTimerReloadValueForOneTick;
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portNVIC_SYSTICK_LOAD_REG = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;;
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portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
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}
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/*-----------------------------------------------------------*/
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