It took me a long time to figure out that the board has no 32KHz crystal

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3069 42af7a65-404d-4744-a932-0658087f49c3

configs/avr32dev1/README.txt

@@ -62,10 +62,16 @@ OSC1 between MCUZone.com and Atmel:
    23    31   PA12 XOUT32    XOUT32 (32 Khz)
   ----- ----- ---- --------- --------------------
 
-NOTE: These crystal inputs/outputs are analog signals and my
+NOTE 1: These crystal inputs/outputs are analog signals and my
 assumption is that they need no pin multiplexing setting to
 enable them for the external crystal function.
 
+NOTE 2: There is no support for OSC1.
+
+NOTE 3: There are solder pads for the 32KHz OSC32, but the
+crystal is not populated on my board.  Therefore, the RTC will
+have to run from the (uncalibrated) RCOSC.
+
 Serial Connection
 ^^^^^^^^^^^^^^^^^
 

configs/avr32dev1/include/board.h

@@ -54,8 +54,10 @@
 /* Oscillator setup:  RCOSC, OSC32, OSC0, OSC1.  Only RCOSC, OSC0, or PLL0 can drive
  * the main clock.
  */
- 
-/* #define AVR32_FRCOSC      15200         RCOSC frequency in Hz */
+
+/* The RCOSC frequency needs to be calibrated! */
+
+#define AVR32_FRCOSC         115000     /* RCOSC frequency in Hz. 115KHz nominal */
 
 #define AVR32_FOSC32         32768      /* OSC32 frequency in Hz */
 #define AVR32_OSC32STARTUP   3          /* OSC32 startup time in RCOSC periods */
@@ -117,10 +119,17 @@
 #undef  AVR32_CLOCK_USB_OSC1
 #define AVR32_CLOCK_USB_DIV   0
 
-/* Main Clock settup: Select OSC0 as the main clock */
+/* Main Clock settup: Select OSC0 as the main clock.
+ *
+ * - A 12Mhz crystal is provided on he board for OSC0.
+ * - The AVR32DEV1 board has no support for OSC1.
+ * - There are pads for he 32Khz OSC32, but it is not populated on the
+ *   board.
+ */
 
 #define AVR32_CLOCK_OSC0      1
-#undef  AVR32_CLOCK_OSC1
+#undef  AVR32_CLOCK_OSC1          /* Not supported */
+#undef  AVR32_CLOCK_OSC32         /* Not populated */
 #undef  AVR32_CLOCK_PLL0
 #undef  AVR32_CLOCK_PLL1