mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-08-20 01:58:32 -04:00
Add tickless idle support in Cortex-M ports.
Change CCS R4 directory name.
This commit is contained in:
Richard Barry
parent
6ec4c7cecb
commit
e03ab659f3
21 changed files with 2395 additions and 596 deletions
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@ -1,6 +1,6 @@
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/*
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FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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***************************************************************************
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* *
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@ -40,7 +40,7 @@
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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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@ -50,17 +50,17 @@
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, training, latest information,
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http://www.FreeRTOS.org - Documentation, training, latest information,
|
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license 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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@ -72,7 +72,7 @@
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#include "FreeRTOS.h"
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#include "task.h"
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#ifndef __TARGET_FPU_VFP
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#ifndef __TARGET_FPU_VFP
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#error This port can only be used when the project options are configured to enable hardware floating point support.
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#endif
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@ -80,17 +80,35 @@
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#error configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to 0. See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html
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#endif
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/* Constants required to manipulate the NVIC. */
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#define portNVIC_SYSTICK_CTRL ( ( volatile unsigned long *) 0xe000e010 )
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#define portNVIC_SYSTICK_LOAD ( ( volatile unsigned long *) 0xe000e014 )
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#define portNVIC_INT_CTRL ( ( volatile unsigned long *) 0xe000ed04 )
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#define portNVIC_SYSPRI2 ( ( volatile unsigned long *) 0xe000ed20 )
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#define portNVIC_SYSTICK_CLK 0x00000004
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#define portNVIC_SYSTICK_INT 0x00000002
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#define portNVIC_SYSTICK_ENABLE 0x00000001
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#define portNVIC_PENDSVSET 0x10000000
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#define portNVIC_PENDSV_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 16 )
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#define portNVIC_SYSTICK_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 24 )
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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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/* 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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#define portNVIC_SYSTICK_LOAD_REG ( * ( ( volatile unsigned long * ) 0xe000e014 ) )
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#define portNVIC_SYSTICK_CURRENT_VALUE_REG ( * ( ( volatile unsigned long * ) 0xe000e018 ) )
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#define portNVIC_INT_CTRL_REG ( * ( ( volatile unsigned long * ) 0xe000ed04 ) )
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#define portNVIC_SYSPRI2_REG ( * ( ( volatile unsigned long * ) 0xe000ed20 ) )
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/* ...then bits in the registers. */
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#define portNVIC_SYSTICK_CLK_BIT ( 1UL << 2UL )
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#define portNVIC_SYSTICK_INT_BIT ( 1UL << 1UL )
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#define portNVIC_SYSTICK_ENABLE_BIT ( 1UL << 0UL )
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#define portNVIC_SYSTICK_COUNT_FLAG_BIT ( 1UL << 16UL )
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#define portNVIC_PENDSVSET_BIT ( 1UL << 28UL )
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#define portNVIC_PENDSVCLEAR_BIT ( 1UL << 27UL )
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#define portNVIC_PEND_SYSTICK_CLEAR_BIT ( 1UL << 25UL )
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#define portNVIC_PENDSV_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 16 )
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#define portNVIC_SYSTICK_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 24 )
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/* Constants required to manipulate the VFP. */
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#define portFPCCR ( ( volatile unsigned long * ) 0xe000ef34 ) /* Floating point context control register. */
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@ -104,7 +122,7 @@
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variable. */
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static unsigned portBASE_TYPE uxCriticalNesting = 0xaaaaaaaa;
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/*
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/*
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* Setup the timer to generate the tick interrupts.
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*/
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static void prvSetupTimerInterrupt( void );
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@ -125,27 +143,41 @@ static void prvStartFirstTask( void );
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* Functions defined in portasm.s to enable the VFP.
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*/
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static void prvEnableVFP( void );
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/*-----------------------------------------------------------*/
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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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/*
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* The maximum number of tick periods that can be suppressed is limited by the
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* 24 bit resolution of the SysTick timer.
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*/
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#if configUSE_TICKLESS_IDLE == 1
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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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/*
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* See header file for description.
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/*
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* See header file for description.
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*/
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portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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{
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/* Simulate the stack frame as it would be created by a context switch
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interrupt. */
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/* Offset added to account for the way the MCU uses the stack on entry/exit
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of interrupts, and to ensure alignment. */
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pxTopOfStack--;
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*pxTopOfStack = portINITIAL_XPSR; /* xPSR */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* PC */
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pxTopOfStack--;
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*pxTopOfStack = 0; /* LR */
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/* Save code space by skipping register initialisation. */
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pxTopOfStack -= 5; /* R12, R3, R2 and R1. */
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*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */
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@ -156,7 +188,7 @@ portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE
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*pxTopOfStack = portINITIAL_EXEC_RETURN;
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pxTopOfStack -= 8; /* R11, R10, R9, R8, R7, R6, R5 and R4. */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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@ -173,7 +205,7 @@ __asm void vPortSVCHandler( void )
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ldmia r0!, {r4-r11, r14}
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msr psp, r0
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mov r0, #0
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msr basepri, r0
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msr basepri, r0
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bx r14
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}
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/*-----------------------------------------------------------*/
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@ -199,41 +231,41 @@ __asm void prvStartFirstTask( void )
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__asm void prvEnableVFP( void )
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{
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PRESERVE8
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/* The FPU enable bits are in the CPACR. */
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ldr.w r0, =0xE000ED88
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ldr r1, [r0]
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/* Enable CP10 and CP11 coprocessors, then save back. */
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orr r1, r1, #( 0xf << 20 )
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str r1, [r0]
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bx r14
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bx r14
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nop
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}
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/*-----------------------------------------------------------*/
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/*
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* See header file for description.
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/*
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* See header file for description.
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*/
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portBASE_TYPE xPortStartScheduler( void )
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{
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/* Make PendSV, CallSV and SysTick the same priroity as the kernel. */
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*(portNVIC_SYSPRI2) |= portNVIC_PENDSV_PRI;
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*(portNVIC_SYSPRI2) |= portNVIC_SYSTICK_PRI;
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portNVIC_SYSPRI2_REG |= portNVIC_PENDSV_PRI;
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portNVIC_SYSPRI2_REG |= portNVIC_SYSTICK_PRI;
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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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/* Initialise the critical nesting count ready for the first task. */
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uxCriticalNesting = 0;
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/* Ensure the VFP is enabled - it should be anyway. */
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prvEnableVFP();
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/* Lazy save always. */
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*( portFPCCR ) |= portASPEN_AND_LSPEN_BITS;
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/* Start the first task. */
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prvStartFirstTask();
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@ -252,7 +284,7 @@ void vPortEndScheduler( void )
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void vPortYieldFromISR( void )
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{
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/* Set a PendSV to request a context switch. */
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*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
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portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
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}
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/*-----------------------------------------------------------*/
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@ -281,11 +313,11 @@ __asm void xPortPendSVHandler( void )
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PRESERVE8
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mrs r0, psp
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mrs r0, psp
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/* Get the location of the current TCB. */
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ldr r3, =pxCurrentTCB
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ldr r2, [r3]
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ldr r3, =pxCurrentTCB
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ldr r2, [r3]
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/* Is the task using the FPU context? If so, push high vfp registers. */
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tst r14, #0x10
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@ -293,85 +325,198 @@ __asm void xPortPendSVHandler( void )
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vstmdbeq r0!, {s16-s31}
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/* Save the core registers. */
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stmdb r0!, {r4-r11, r14}
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stmdb r0!, {r4-r11, r14}
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/* Save the new top of stack into the first member of the TCB. */
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str r0, [r2]
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stmdb sp!, {r3, r14}
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mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
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msr basepri, r0
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bl vTaskSwitchContext
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bl vTaskSwitchContext
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mov r0, #0
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msr basepri, r0
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ldmia sp!, {r3, r14}
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/* The first item in pxCurrentTCB is the task top of stack. */
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ldr r1, [r3]
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ldr r1, [r3]
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ldr r0, [r1]
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/* Pop the core registers. */
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ldmia r0!, {r4-r11, r14}
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/* Is the task using the FPU context? If so, pop the high vfp registers
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/* Is the task using the FPU context? If so, pop the high vfp registers
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too. */
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tst r14, #0x10
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it eq
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vldmiaeq r0!, {s16-s31}
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msr psp, r0
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bx r14
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nop
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msr psp, r0
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bx r14
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nop
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}
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/*-----------------------------------------------------------*/
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void xPortSysTickHandler( void )
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{
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unsigned long ulDummy;
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/* If using preemption, also force a context switch. */
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#if configUSE_PREEMPTION == 1
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*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
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{
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/* If using preemption, also force a context switch. */
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portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
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}
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#endif
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ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
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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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( void ) portSET_INTERRUPT_MASK_FROM_ISR();
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{
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vTaskIncrementTick();
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}
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portCLEAR_INTERRUPT_MASK_FROM_ISR( ulDummy );
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portCLEAR_INTERRUPT_MASK_FROM_ISR( 0 );
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}
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/*-----------------------------------------------------------*/
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#if configUSE_TICKLESS_IDLE == 1
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__weak void vPortSuppressTicksAndSleep( portTickType xExpectedIdleTime )
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{
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unsigned long ulReloadValue, ulCompleteTickPeriods, ulCompletedSysTickIncrements;
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/* Make sure the SysTick reload value does not overflow the counter. */
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if( xExpectedIdleTime > xMaximumPossibleSuppressedTicks )
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{
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xExpectedIdleTime = xMaximumPossibleSuppressedTicks;
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}
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/* Calculate the reload value required to wait xExpectedIdleTime
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tick periods. -1 is used because this code will execute part way
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through one of the tick periods, and the fraction of a tick period is
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accounted for later. */
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ulReloadValue = ( ulTimerReloadValueForOneTick * ( xExpectedIdleTime - 1UL ) );
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if( ulReloadValue > ulStoppedTimerCompensation )
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{
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ulReloadValue -= ulStoppedTimerCompensation;
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}
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/* Stop the SysTick momentarily. The time the SysTick is stopped for
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is accounted for as best it can be, but using the tickless mode will
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inevitably result in some tiny drift of the time maintained by the
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kernel with respect to calendar time. */
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portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT;
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/* If a context switch is pending then abandon the low power entry as
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the context switch might have been pended by an external interrupt that
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requires processing. */
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if( ( portNVIC_INT_CTRL_REG & portNVIC_PENDSVSET_BIT ) != 0 )
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{
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/* Restart SysTick. */
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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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else
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{
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/* Adjust the reload value to take into account that the current
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time slice is already partially complete. */
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ulReloadValue += ( portNVIC_SYSTICK_LOAD_REG - ( portNVIC_SYSTICK_LOAD_REG - portNVIC_SYSTICK_CURRENT_VALUE_REG ) );
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portNVIC_SYSTICK_LOAD_REG = ulReloadValue;
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/* Clear the SysTick count flag and set the count value back to
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zero. */
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portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
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/* Restart SysTick. */
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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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portPRE_SLEEP_PROCESSING();
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__wfi();
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portPOST_SLEEP_PROCESSING();
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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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inevitably result in some tiny drift of the time maintained by the
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kernel with respect to calendar time. */
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portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT;
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if( ( portNVIC_SYSTICK_CTRL_REG & portNVIC_SYSTICK_COUNT_FLAG_BIT ) != 0 )
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{
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/* The tick interrupt has already executed, and the SysTick
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count reloaded with the portNVIC_SYSTICK_LOAD_REG value.
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Reset the portNVIC_SYSTICK_LOAD_REG with whatever remains of
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this tick period. */
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portNVIC_SYSTICK_LOAD_REG = ulTimerReloadValueForOneTick - ( ulReloadValue - portNVIC_SYSTICK_CURRENT_VALUE_REG );
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/* The tick interrupt handler will already have pended the tick
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processing in the kernel. As the pending tick will be
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processed as soon as this function exits, the tick value
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maintained by the tick is stepped forward by one less than the
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time spent waiting. */
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ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
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}
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else
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{
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/* Something other than the tick interrupt ended the sleep.
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Work out how long the sleep lasted. */
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ulCompletedSysTickIncrements = ( xExpectedIdleTime * ulTimerReloadValueForOneTick ) - portNVIC_SYSTICK_CURRENT_VALUE_REG;
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/* How many complete tick periods passed while the processor
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was waiting? */
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ulCompleteTickPeriods = ulCompletedSysTickIncrements / ulTimerReloadValueForOneTick;
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/* The reload value is set to whatever fraction of a single tick
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period remains. */
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portNVIC_SYSTICK_LOAD_REG = ( ( ulCompleteTickPeriods + 1 ) * ulTimerReloadValueForOneTick ) - ulCompletedSysTickIncrements;
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}
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/* Restart SysTick so it runs from portNVIC_SYSTICK_LOAD_REG
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again, then set portNVIC_SYSTICK_LOAD_REG back to its standard
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value. */
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portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
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portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
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vTaskStepTick( ulCompleteTickPeriods );
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}
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}
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#endif /* #if configUSE_TICKLESS_IDLE */
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/*-----------------------------------------------------------*/
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/*
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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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{
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/* Calculate the constants required to configure the tick interrupt. */
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ulTimerReloadValueForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
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#if configUSE_TICKLESS_IDLE == 1
|
||||
xMaximumPossibleSuppressedTicks = 0xffffffUL / ( ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL );
|
||||
#endif /* configUSE_TICKLESS_IDLE */
|
||||
|
||||
/* Configure SysTick to interrupt at the requested rate. */
|
||||
*(portNVIC_SYSTICK_LOAD) = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
|
||||
*(portNVIC_SYSTICK_CTRL) = portNVIC_SYSTICK_CLK | portNVIC_SYSTICK_INT | portNVIC_SYSTICK_ENABLE;
|
||||
portNVIC_SYSTICK_LOAD_REG = ulTimerReloadValueForOneTick;
|
||||
portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
__asm void vPortSetInterruptMask( void )
|
||||
__asm unsigned long ulPortSetInterruptMask( void )
|
||||
{
|
||||
PRESERVE8
|
||||
|
||||
mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
|
||||
msr basepri, r0
|
||||
mrs r0, basepri
|
||||
mov r1, #configMAX_SYSCALL_INTERRUPT_PRIORITY
|
||||
msr basepri, r1
|
||||
bx r14
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
__asm void vPortClearInterruptMask( void )
|
||||
__asm void vPortClearInterruptMask( unsigned long ulNewMask )
|
||||
{
|
||||
PRESERVE8
|
||||
|
||||
/* FAQ: Setting BASEPRI to 0 is not a bug. Please see
|
||||
http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html before disagreeing. */
|
||||
mov r0, #0
|
||||
msr basepri, r0
|
||||
bx r14
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue