git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@380 35acf78f-673a-0410-8e92-d51de3d6d3f4

ports/ARMCM3/chcore.c

@@ -27,7 +27,9 @@ __attribute__((weak))
 void _IdleThread(void *p) {
 
   while (TRUE) {
-//    asm volatile ("wfi");
+#if ENABLE_WFI_IDLE != 0
+    asm volatile ("wfi");
+#endif
   }
 }
 

ports/ARMCM3/chcore.h

@@ -29,6 +29,7 @@ typedef void *regarm;
  */
 #define BASEPRI_USER    0       /* User level BASEPRI, 0 = disabled.    */
 #define BASEPRI_KERNEL  0x10    /* BASEPRI level within kernel lock.    */
+#define ENABLE_WFI_IDLE 0       /* Enables the use of the WFI ins.      */
 
 /*
  * Interrupt saved context, empty in this architecture.

readme.txt

@@ -91,6 +91,11 @@ Win32-MinGW            - ChibiOS/RT simulator and demo into a WIN32 process,
   performance.
 - Added a test_terminate_threads() function to the test framework.
 - Made the Cortex-M3 port preemption code more readable.
+- Added a ENABLE_WFI_IDLE option to the chcore.h file in the Cortex-M3 port,
+  setting this option to 1 enables the kernel to enter a low power mode when
+  executing the idle thread. Be careful however, this option can be not
+  compatible with some JTAB probes, it is better to enable it only on final
+  builds and not when debugging.
 
 *** 0.6.8 ***
 - FIX: Fixed a bug in the priority inheritance mechanism, the bug was only a