Special IDLE for STM32 will execut WFI to sleep until an interrupt occurs
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3324 42af7a65-404d-4744-a932-0658087f49c3
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@ -62,32 +62,30 @@
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* Name: up_idle
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*
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* Description:
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* up_idle() is the logic that will be executed when their
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* is no other ready-to-run task. This is processor idle
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* time and will continue until some interrupt occurs to
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* cause a context switch from the idle task.
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* up_idle() is the logic that will be executed when their is no other
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* ready-to-run task. This is processor idle time and will continue until
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* some interrupt occurs to cause a context switch from the idle task.
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*
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* Processing in this state may be processor-specific. e.g.,
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* this is where power management operations might be
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* performed.
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* Processing in this state may be processor-specific. e.g., this is where
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* power management operations might be performed.
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*
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****************************************************************************/
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void up_idle(void)
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{
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#if defined(CONFIG_SUPPRESS_INTERRUPTS) || defined(CONFIG_SUPPRESS_TIMER_INTS)
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/* If the system is idle and there are no timer interrupts,
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* then process "fake" timer interrupts. Hopefully, something
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* will wake up.
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/* If the system is idle and there are no timer interrupts, then process
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* "fake" timer interrupts. Hopefully, something will wake up.
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*/
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sched_process_timer();
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#endif
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#else
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/* Sleep until an interrupt occurs to save power */
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#if 0
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asm("WFI"); /* For example */
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#endif
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#endif
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}
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@ -1,7 +1,7 @@
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############################################################################
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# arch/arm/src/stm32/Make.defs
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#
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# Copyright (C) 2009 Gregory Nutt. All rights reserved.
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# Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
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# Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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#
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# Redistribution and use in source and binary forms, with or without
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@ -38,14 +38,14 @@ HEAD_ASRC = stm32_vectors.S
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CMN_ASRCS = up_saveusercontext.S up_fullcontextrestore.S up_switchcontext.S
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CMN_CSRCS = up_allocateheap.c up_assert.c up_blocktask.c up_copystate.c \
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up_createstack.c up_mdelay.c up_udelay.c up_exit.c \
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up_idle.c up_initialize.c up_initialstate.c up_interruptcontext.c \
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up_initialize.c up_initialstate.c up_interruptcontext.c \
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up_modifyreg8.c up_modifyreg16.c up_modifyreg32.c \
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up_releasepending.c up_releasestack.c up_reprioritizertr.c \
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up_schedulesigaction.c up_sigdeliver.c up_unblocktask.c \
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up_usestack.c up_doirq.c up_hardfault.c up_svcall.c
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CHIP_ASRCS =
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CHIP_CSRCS = stm32_start.c stm32_rcc.c stm32_gpio.c stm32_irq.c \
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stm32_timerisr.c stm32_dma.c stm32_lowputc.c stm32_serial.c \
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stm32_spi.c stm32_usbdev.c stm32_sdio.c
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CHIP_CSRCS = stm32_start.c stm32_rcc.c stm32_gpio.c stm32_idle.c \
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stm32_irq.c stm32_timerisr.c stm32_dma.c stm32_lowputc.c \
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stm32_serial.c stm32_spi.c stm32_usbdev.c stm32_sdio.c
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104
arch/arm/src/stm32/stm32_idle.c
Executable file
104
arch/arm/src/stm32/stm32_idle.c
Executable file
@ -0,0 +1,104 @@
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/****************************************************************************
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* arch/arm/src/stm32/stm32_idle.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <arch/board/board.h>
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include "up_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Does the board support an IDLE LED to indicate that the board is in the
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* IDLE state?
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*/
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#if defined(CONFIG_ARCH_LEDS) && defined(LED_IDLE)
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# define BEGIN_IDLE() up_ledon(LED_IDLE)
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# define END_IDLE() up_ledoff(LED_IDLE)
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#else
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# define BEGIN_IDLE()
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# define END_IDLE()
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_idle
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*
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* Description:
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* up_idle() is the logic that will be executed when their is no other
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* ready-to-run task. This is processor idle time and will continue until
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* some interrupt occurs to cause a context switch from the idle task.
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*
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* Processing in this state may be processor-specific. e.g., this is where
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* power management operations might be performed.
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*
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****************************************************************************/
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void up_idle(void)
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{
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#if defined(CONFIG_SUPPRESS_INTERRUPTS) || defined(CONFIG_SUPPRESS_TIMER_INTS)
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/* If the system is idle and there are no timer interrupts, then process
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* "fake" timer interrupts. Hopefully, something will wake up.
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*/
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sched_process_timer();
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#else
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/* Sleep until an interrupt occurs to save power */
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BEGIN_IDLE();
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asm("WFI");
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END_IDLE();
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#endif
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}
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