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

1 files changed, 28 insertions, 18 deletions

diff --git a/nuttx/configs/olimex-lpc1766stk/README.txt b/nuttx/configs/olimex-lpc1766stk/README.txt
index d09d504d0..98b0bb135 100755
--- a/nuttx/configs/olimex-lpc1766stk/README.txt
+++ b/nuttx/configs/olimex-lpc1766stk/README.txt
@@ -329,6 +329,9 @@ LEDs
     if you see this at all, it probably means that the system is hanging up

     somewhere in the initialization phases.

   - ON means that the OS completed initialization.

+  - Glowing means that the LPC17 is running in a reduced power mode: LED1 is

+    turned off when the processor enters sleep mode and back on when it wakesup

+    up.

 

   LED2:

   - ON/OFF toggles means that various events are happening.

@@ -341,25 +344,32 @@ LEDs
   NOTE:  LED2 is controlled by a jumper labeled: ACC_IRQ/LED2.  That jump must be

   in the LED2 position in order to support LED2.

 

-  LED1  LED2      Meaning

-  ----- --------  --------------------------------------------------------------------

-   OFF   OFF      Still initializing and there is no interrupt activity. 

-                  Initialization is very fast so if you see this, it probably means

-                  that the system is hung up somewhere in the initialization phases.

-   OFF   Glowing  Still initializing (see above) but taking interrupts.

-   OFF   ON       This would mean that (1) initialization did not complete but the

-                  software is hung, perhaps in an infinite loop, somewhere inside

-                  of an interrupt handler.

-   OFF   Flashing Ooops!  We crashed before finishing initialization.

+  LED1    LED2      Meaning

+  ------- --------  --------------------------------------------------------------------

+   OFF    OFF      Still initializing and there is no interrupt activity. 

+                    Initialization is very fast so if you see this, it probably means

+                    that the system is hung up somewhere in the initialization phases.

+   OFF     Glowing  Still initializing (see above) but taking interrupts.

+   OFF     ON       This would mean that (1) initialization did not complete but the

+                    software is hung, perhaps in an infinite loop, somewhere inside

+                    of an interrupt handler.

+   OFF     Flashing Ooops!  We crashed before finishing initialization (or, perhaps

+                    after initialization, during an interrupt while the LPC17xx was

+                    sleeping -- see below).

  

-   ON    OFF      The system has completed initialization, but is apparently not taking

-                  any interrupts.

-   ON    Glowing  This is the normal healthy state: The OS successfully initialized

-                  and is taking interrupts.

-   ON    ON       This would mean that (1) the OS complete initialization, but (2)

-                  the software is hung, perhaps in an infinite loop, somewhere inside

-                  of a signal or interrupt handler.

-   ON    Flashing Ooops!  We crashed sometime after initialization.

+   ON      OFF      The system has completed initialization, but is apparently not taking

+                    any interrupts.

+   ON      Glowing  The OS successfully initialized and is taking interrupts (but, for

+                    some reason, is never entering a reduced power mode -- perhaps the

+                    CPU is very busy?).

+   ON      ON       This would mean that (1) the OS complete initialization, but (2)

+                    the software is hung, perhaps in an infinite loop, somewhere inside

+                    of a signal or interrupt handler.

+   Glowing Glowing  This is also a normal healthy state: The OS successfully initialized,

+                    is running in reduced power mode, but taking interrupts.  The glow

+                    is very faint and you may have to dim the lights to see that LEDs are

+                    active at all!

+   ON      Flashing Ooops!  We crashed sometime after initialization.

 

 Using OpenOCD and GDB with an FT2232 JTAG emulator

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