Add STM32 PM sleep support

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4953 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/stm32/Make.defs

@@ -84,7 +84,7 @@ ifneq ($(CONFIG_IDLE_CUSTOM),y)
 CHIP_CSRCS	+= stm32_idle.c
 endif
 
-CHIP_CSRCS	+= stm32_pmstop.c stm32_pmstandby.c
+CHIP_CSRCS	+= stm32_pmstop.c stm32_pmstandby.c stm32_pmsleep.c
 
 ifneq ($(CONFIG_PM_CUSTOMINIT),y)
 CHIP_CSRCS	+= stm32_pminitialize.c

arch/arm/src/stm32/stm32_exti.h

@@ -42,6 +42,8 @@
 
 #include <nuttx/config.h>
 
+#include <nuttx/irq.h>
+
 #include "chip.h"
 #include "chip/stm32_exti.h"
 

arch/arm/src/stm32/stm32_exti_alarm.c

@@ -135,12 +135,12 @@ xcpt_t stm32_exti_alarm(bool risingedge, bool fallingedge, bool event,
 
   if (func)
     {
-      irq_attach(STM32_IRQ_RTCALRM, stm32_exti_alarm_isr);
+      irq_attach(STM32_IRQ_RTCALR, stm32_exti_alarm_isr);
-      up_enable_irq(STM32_IRQ_RTCALRM);
+      up_enable_irq(STM32_IRQ_RTCALR);
     }
   else
     {
-      up_disable_irq(STM32_IRQ_RTCALRM);
+      up_disable_irq(STM32_IRQ_RTCALR);
     }
 
   /* Configure rising/falling edges */

arch/arm/src/stm32/stm32_pm.h

@@ -111,6 +111,28 @@ EXTERN int stm32_pmstop(bool lpds);
 
 EXTERN int stm32_pmstandby(void);
 
+/****************************************************************************
+ * Name: stm32_pmsleep
+ *
+ * Description:
+ *   Enter SLEEP mode. 
+ *
+ * Input Parameters:
+ *   sleeponexit - true:  SLEEPONEXIT bit is set when the WFI instruction is
+ *                        executed, the MCU enters Sleep mode as soon as it 
+ *                        exits the lowest priority ISR.
+ *               - false: SLEEPONEXIT bit is cleared, the MCU enters Sleep mode
+ *                        as soon as WFI or WFE instruction is executed.
+ * Returned Value:
+ *   Zero means that the STOP was successfully entered and the system has
+ *   been re-awakened.  The internal volatage regulator is back to its
+ *   original state.  Otherwise, STOP mode did not occur and a negated
+ *   errno value is returned to indicate the cause of the failure.
+ *
+ ****************************************************************************/
+
+EXTERN void stm32_pmsleep(bool sleeponexit);
+
 #undef EXTERN
 #ifdef __cplusplus
 }

arch/arm/src/stm32/stm32_pmsleep.c

@@ -0,0 +1,117 @@
+/****************************************************************************
+ * arch/arm/src/stm32/stm32_pmsleep.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Authors: Gregory Nutt <gnutt@nuttx.org>
+ *            Diego Sanchez <dsanchez@nx-engineering.com>
+ *
+ * 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 <nuttx/config.h>
+
+#include <stdbool.h>
+
+#include "up_arch.h"
+#include "nvic.h"
+#include "stm32_pwr.h"
+#include "stm32_pm.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_pmsleep
+ *
+ * Description:
+ *   Enter SLEEP mode. 
+ *
+ * Input Parameters:
+ *   sleeponexit - true:  SLEEPONEXIT bit is set when the WFI instruction is
+ *                        executed, the MCU enters Sleep mode as soon as it 
+ *                        exits the lowest priority ISR.
+ *               - false: SLEEPONEXIT bit is cleared, the MCU enters Sleep mode
+ *                        as soon as WFI or WFE instruction is executed.
+ * Returned Value:
+ *   Zero means that the STOP was successfully entered and the system has
+ *   been re-awakened.  The internal volatage regulator is back to its
+ *   original state.  Otherwise, STOP mode did not occur and a negated
+ *   errno value is returned to indicate the cause of the failure.
+ *
+ ****************************************************************************/
+
+void stm32_pmsleep(bool sleeponexit)
+{
+  uint32_t regval;
+
+  /* Clear SLEEPDEEP bit of Cortex System Control Register */
+
+  regval  = getreg32(NVIC_SYSCON);
+  regval &= ~NVIC_SYSCON_SLEEPDEEP;
+  if (sleeponexit)
+    {
+      regval |= NVIC_SYSCON_SLEEPONEXIT;
+    }
+  else
+    {
+      regval &= ~NVIC_SYSCON_SLEEPONEXIT;
+    }
+ 
+  putreg32(regval, NVIC_SYSCON);
+
+  /* Sleep until the wakeup interrupt or event occurs */
+
+#ifdef CONFIG_PM_WFE
+  /* Mode: SLEEP + Entry with WFE */
+
+  __asm("wfe");
+#else
+  /* Mode: SLEEP + Entry with WFI */
+
+  __asm("wfi");
+#endif
+}