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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-03-02 14:43:28 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-03-02 14:43:28 +0000 |
commit | dd2673f8ec1cb07aae5e94c44eaf1118491a8d64 (patch) | |
tree | 51dd8141e5501ca2532309aafbd047cf1ff3121c /nuttx/arch/arm | |
parent | dec7f69cce6af4bf8131c13467907477ffdc6500 (diff) | |
download | px4-nuttx-dd2673f8ec1cb07aae5e94c44eaf1118491a8d64.tar.gz px4-nuttx-dd2673f8ec1cb07aae5e94c44eaf1118491a8d64.tar.bz2 px4-nuttx-dd2673f8ec1cb07aae5e94c44eaf1118491a8d64.zip |
Add logic to sleep in lpc17xx idle loop
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3329 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm')
-rwxr-xr-x | nuttx/arch/arm/src/lpc17xx/Make.defs | 8 | ||||
-rwxr-xr-x | nuttx/arch/arm/src/lpc17xx/lpc17_idle.c | 104 |
2 files changed, 108 insertions, 4 deletions
diff --git a/nuttx/arch/arm/src/lpc17xx/Make.defs b/nuttx/arch/arm/src/lpc17xx/Make.defs index 2b4ea0ffc..3665b9cce 100755 --- a/nuttx/arch/arm/src/lpc17xx/Make.defs +++ b/nuttx/arch/arm/src/lpc17xx/Make.defs @@ -1,7 +1,7 @@ ############################################################################ # arch/arm/src/lpc17xx/Make.defs # -# Copyright (C) 2010 Gregory Nutt. All rights reserved. +# Copyright (C) 2010-2011 Gregory Nutt. All rights reserved. # Author: Gregory Nutt <spudmonkey@racsa.co.cr> # # Redistribution and use in source and binary forms, with or without @@ -41,7 +41,7 @@ HEAD_ASRC = lpc17_vectors.S CMN_ASRCS = up_saveusercontext.S up_fullcontextrestore.S up_switchcontext.S CMN_CSRCS = up_assert.c up_blocktask.c up_copystate.c up_createstack.c \ - up_mdelay.c up_udelay.c up_exit.c up_idle.c up_initialize.c \ + up_mdelay.c up_udelay.c up_exit.c up_initialize.c \ up_initialstate.c up_interruptcontext.c up_modifyreg8.c \ up_modifyreg16.c up_modifyreg32.c up_releasepending.c \ up_releasestack.c up_reprioritizertr.c up_schedulesigaction.c \ @@ -52,8 +52,8 @@ CMN_CSRCS = up_assert.c up_blocktask.c up_copystate.c up_createstack.c \ CHIP_ASRCS = CHIP_CSRCS = lpc17_allocateheap.c lpc17_clockconfig.c lpc17_clrpend.c \ - lpc17_gpio.c lpc17_irq.c lpc17_lowputc.c lpc17_serial.c \ - lpc17_spi.c lpc17_ssp.c lpc17_start.c lpc17_timerisr.c + lpc17_gpio.c lpc17_idle.c lpc17_irq.c lpc17_lowputc.c \ + lpc17_serial.c lpc17_spi.c lpc17_ssp.c lpc17_start.c lpc17_timerisr.c # Configuration-dependent LPC17xx files diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_idle.c b/nuttx/arch/arm/src/lpc17xx/lpc17_idle.c new file mode 100755 index 000000000..6e55bca9e --- /dev/null +++ b/nuttx/arch/arm/src/lpc17xx/lpc17_idle.c @@ -0,0 +1,104 @@ +/****************************************************************************
+ * arch/arm/src/lpc17/lpc17_idle.c
+ *
+ * Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <arch/board/board.h>
+#include <nuttx/config.h>
+
+#include <nuttx/arch.h>
+#include "up_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Does the board support an IDLE LED to indicate that the board is in the
+ * IDLE state?
+ */
+
+#if defined(CONFIG_ARCH_LEDS) && defined(LED_IDLE)
+# define BEGIN_IDLE() up_ledon(LED_IDLE)
+# define END_IDLE() up_ledoff(LED_IDLE)
+#else
+# define BEGIN_IDLE()
+# define END_IDLE()
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_idle
+ *
+ * Description:
+ * up_idle() is the logic that will be executed when their is no other
+ * ready-to-run task. This is processor idle time and will continue until
+ * some interrupt occurs to cause a context switch from the idle task.
+ *
+ * Processing in this state may be processor-specific. e.g., this is where
+ * power management operations might be performed.
+ *
+ ****************************************************************************/
+
+void up_idle(void)
+{
+#if defined(CONFIG_SUPPRESS_INTERRUPTS) || defined(CONFIG_SUPPRESS_TIMER_INTS)
+ /* If the system is idle and there are no timer interrupts, then process
+ * "fake" timer interrupts. Hopefully, something will wake up.
+ */
+
+ sched_process_timer();
+#else
+
+ /* Sleep until an interrupt occurs to save power */
+
+ BEGIN_IDLE();
+ asm("WFI");
+ END_IDLE();
+#endif
+}
+
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