1 files changed, 187 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/nuc1xx/nuc_idle.c b/nuttx/arch/arm/src/nuc1xx/nuc_idle.c
new file mode 100644
index 000000000..3c7fc53da
--- /dev/null
+++ b/nuttx/arch/arm/src/nuc1xx/nuc_idle.c
@@ -0,0 +1,187 @@
+/****************************************************************************
+ *  arch/arm/src/stm32/nuc_idle.c
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <nuttx/power/pm.h>
+
+#include <arch/irq.h>
+
+#include "chip.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
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_idlepm
+ *
+ * Description:
+ *   Perform IDLE state power management.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PM
+static void up_idlepm(void)
+{
+  static enum pm_state_e oldstate = PM_NORMAL;
+  enum pm_state_e newstate;
+  irqstate_t flags;
+  int ret;
+  
+  /* Decide, which power saving level can be obtained */
+
+  newstate = pm_checkstate();
+
+  /* Check for state changes */
+
+  if (newstate != oldstate)
+    {
+      flags = irqsave();
+
+      /* Perform board-specific, state-dependent logic here */
+
+      llvdbg("newstate= %d oldstate=%d\n", newstate, oldstate);
+
+      /* Then force the global state change */
+
+      ret = pm_changestate(newstate);
+      if (ret < 0)
+        {
+          /* The new state change failed, revert to the preceding state */
+
+          (void)pm_changestate(oldstate);
+        }
+      else
+        {
+          /* Save the new state */
+
+          oldstate = newstate;
+        }
+
+      /* MCU-specific power management logic */
+
+      switch (newstate)
+        {
+        case PM_NORMAL:
+          break;
+
+        case PM_IDLE:
+          break;
+
+        case PM_STANDBY:
+          nuc_pmstop(true);
+          break;
+
+        case PM_SLEEP:
+          (void)nuc_pmstandby();
+          break;
+
+        default:
+          break;
+        }
+
+      irqrestore(flags);
+    }
+}
+#else
+#  define up_idlepm()
+#endif
+
+/****************************************************************************
+ * 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
+
+  /* Perform IDLE mode power management */
+
+  up_idlepm();
+
+  /* Sleep until an interrupt occurs to save power. */
+
+  BEGIN_IDLE();
+  asm("WFI");
+  END_IDLE();
+#endif
+}