PM update

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4982 42af7a65-404d-4744-a932-0658087f49c3

configs/stm3210e-eval/pm/defconfig

@@ -468,6 +468,7 @@ CONFIG_SCHED_ATEXIT=n
 CONFIG_PM=y
 CONFIG_PM_CUSTOMINIT=y
 CONFIG_IDLE_CUSTOM=y
+CONFIG_PM_SLEEP_WAKEUP=n
 
 #
 # Board/Application-Specific Power Management Configuration.

configs/stm3210e-eval/src/up_idle.c

@@ -74,16 +74,50 @@
 #  define END_IDLE()
 #endif
 
-/* Values for the RTC Alarm to wake up from the PM_STANDBY mode */
+/* Values for the RTC Alarm to wake up from the PM_STANDBY mode
+ * (which corresponds to STM32 stop mode).  If this alarm expires,
+ * the logic in this file will wakeup from PM_STANDBY mode and
+ * transition to PM_SLEEP mode (STM32 standby mode).
+ */
 
 #ifndef CONFIG_PM_ALARM_SEC
-#  define CONFIG_PM_ALARM_SEC 3
+#  define CONFIG_PM_ALARM_SEC 15
 #endif
 
 #ifndef CONFIG_PM_ALARM_NSEC
 #  define CONFIG_PM_ALARM_NSEC 0
 #endif
 
+/* Values for the RTC Alarm to reset from the PM_SLEEP mode (STM32
+ * standby mode).  If CONFIG_PM_SLEEP_WAKEUP is defined in the
+ * configuration, then the logic in this file will program the RTC
+ * alarm to wakeup the processor after an a delay.
+ *
+ * This feature might be useful, for example, in a system that needs to
+ * use minimal power but awake up to perform some task at periodic
+ * intervals.
+ */
+
+#ifdef CONFIG_PM_SLEEP_WAKEUP
+
+#  ifndef CONFIG_RTC_ALARM
+#    error "CONFIG_RTC_ALARM should be enabled to use CONFIG_PM_SLEEP_WAKEUP"
+#  endif
+
+   /* If CONFIG_PM_SLEEP_WAKEUP is defined, then ifndefCONFIG_PM_SLEEP_WAKEUP_SEC
+    * and ifndefCONFIG_PM_SLEEP_WAKEUP_NSEC define the delay until the STM32
+    * awakens from PM_SLEEP mode.
+    */
+
+#  ifndefCONFIG_PM_SLEEP_WAKEUP_SEC
+#    defineCONFIG_PM_SLEEP_WAKEUP_SEC 10
+#  endif
+
+#  ifndefCONFIG_PM_SLEEP_WAKEUP_NSEC
+#    defineCONFIG_PM_SLEEP_WAKEUP_NSEC 0
+#  endif
+#endif
+
 /****************************************************************************
  * Private Data
  ****************************************************************************/
@@ -112,7 +146,6 @@ static void up_idlepm(void)
 #endif
   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 */
@@ -125,7 +158,7 @@ static void up_idlepm(void)
     {
       lldbg("newstate= %d oldstate=%d\n", newstate, oldstate);
 
-      flags = irqsave();
+      sched_lock();
 
       /* Force the global state change */
 
@@ -138,7 +171,7 @@ static void up_idlepm(void)
 
           /* No state change... */
 
-          goto errout;
+          return;
         }
 
       /* Then perform board-specific, state-dependent logic here */
@@ -147,6 +180,14 @@ static void up_idlepm(void)
         {
         case PM_NORMAL:
           {
+            /* If we just awakened from PM_STANDBY mode, then reconfigure
+             * clocking.
+             */
+
+            if (oldstate == PM_STANDBY)
+              {              
+                stm32_clockconfig();
+              }
           }
           break;
 
@@ -189,9 +230,9 @@ static void up_idlepm(void)
                 lldbg("Warning: The alarm is already set\n");
               }
 #endif
-            /* Call the STM32 stop mode */
+            /* Enter the STM32 stop mode */
 
-            stm32_pmstop(true);
+            (void)stm32_pmstop(false);
 
             /* We have been re-awakened by some even:  A button press?
              * An alarm?  Cancel any pending alarm and resume the normal
@@ -208,7 +249,6 @@ static void up_idlepm(void)
             /* Resume normal operation */
 
             pm_changestate(PM_NORMAL);
-            newstate = PM_NORMAL;
           }
           break;
 
@@ -218,6 +258,37 @@ static void up_idlepm(void)
              * of standby is via the reset path.
              */
 
+#ifdef CONFIG_PM_SLEEP_WAKEUP
+            /* Configure the RTC alarm to Auto Reset the system */
+
+            (void)up_rtc_gettime(&alarmtime);
+
+            alarmtime.tv_sec  +=CONFIG_PM_SLEEP_WAKEUP_SEC;
+            alarmtime.tv_nsec +=CONFIG_PM_SLEEP_WAKEUP_NSEC;
+
+            /* The tv_nsec value must not exceed 1,000,000,000. That
+             * would be an invalid time.
+             */
+
+            if (alarmtime.tv_nsec >= NSEC_PER_SEC)
+              {
+                /* Carry to the seconds */
+
+                alarmtime.tv_sec++;
+                alarmtime.tv_nsec -= NSEC_PER_SEC;
+              }
+
+            /* Set the alarm */
+
+            ret = up_rtc_setalarm(&alarmtime, &up_alarmcb);
+            if (ret < 0)
+              {
+                lldbg("Warning: The alarm is already set\n");
+              }
+#endif
+            /* Enter the STM32 standby mode */
+
+            up_mdelay(10);
             (void)stm32_pmstandby();
           }
           break;
@@ -230,8 +301,7 @@ static void up_idlepm(void)
 
       oldstate = newstate;
 
-errout:
+      sched_unlock();
-      irqrestore(flags);
     }
 }
 #else

configs/stm3210e-eval/src/up_lcd.c

@@ -2,9 +2,13 @@
  * configs/stm3210e-eval/src/up_lcd.c
  * arch/arm/src/board/up_lcd.c
  *
- *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
+ * With power management enhancements by:
+ *
+ *   Author: 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:
@@ -1187,7 +1191,7 @@ static void stm3210e_pm_notify(struct pm_callback_s *cb , enum pm_state_e pmstat
               duty--;
             }
 
-          /* Reduce the LCD light to 50% of the MAXPOWER */
+          /* Reduce the LCD backlight to 50% of the MAXPOWER */
 
           duty >>= 1;
           putreg16((uint16_t)duty, STM32_TIM1_CCR1);
@@ -1197,7 +1201,7 @@ static void stm3210e_pm_notify(struct pm_callback_s *cb , enum pm_state_e pmstat
 
       case(PM_STANDBY):
         {
-          /* Entering STANDBY mode - Turn display off */
+          /* Entering STANDBY mode - Turn display backlight off */
 
 #ifdef CONFIG_LCD_PWM
           putreg16(0, STM32_TIM1_CCR1);
@@ -1207,8 +1211,9 @@ static void stm3210e_pm_notify(struct pm_callback_s *cb , enum pm_state_e pmstat
 
       case(PM_SLEEP):
         {
-          /* Entering SLEEP mode - Logic for PM_SLEEP goes here */
+          /* Entering SLEEP mode - Turn off LCD */
 
+          (void)stm3210e_poweroff();
         }
         break;