Spirit Network Device: Fix a deadlock. Also several other design improvements to eliminate corner cases.

configs/b-l475e-iot01a/README.txt

@@ -273,8 +273,9 @@ Configuration sub-directories
 
     This is another version of nsh that is similar to the above 'nsh'
     configuration but is focused on testing the Spirit1 integration with
-    the 6LoWPAN network stack.    Additional differences
-    are summarized below:
+    the 6LoWPAN network stack.  It supports point-to-point, 6LoWPAN
+    communications between two b-l47e-iot01a boards.  Additional differences
+    from the 'nsh" configuration are summarized below:
 
     NOTES:
 
@@ -292,14 +293,19 @@ Configuration sub-directories
 
             nsh> ifconfig wpan0 hw 37
 
-            Where 37 is address as an example.  It should be different in the
-            the range 1..ed and ef..fe (ee and ff are the reseerd multicast
-            and broadcast addresses.  Zero is valid but not a good idea).
+            Where 37 the address is an example.  It should be different for
+            each radio, but in the the range 1..ed and ef..fe (ee and ff are
+            the reserved for multicast and broadcast addresses, respectively.
+            Zero is a valid address but not recommeded).
 
          b) Bring each the network up on each board in the WPAN:
 
             nsh> ifup wpan0
 
+            You can entry nsh> ifconfig to see if the node address and
+            derived IPv4 are set correctly (the IPv6 address will not be
+            determined until the network is UP).
+
     4. examples/udp is enabled.  This will allow two Spirit1 nodes to
        exchange UDP packets.  Basic instructions:
 

configs/stm32f746g-disco/src/stm32_buttons.c

@@ -124,8 +124,6 @@ int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
 {
   int ret = -EINVAL;
 
-  /* The following should be atomic */
-
   if (id >= MIN_IRQBUTTON && id <= MAX_IRQBUTTON)
     {
       ret = stm32_gpiosetevent(g_buttons[id], true, true, true, irqhandler, arg);

drivers/wireless/spirit/include/spirit_irq.h

@@ -416,7 +416,7 @@ int spirit_irq_get_pending(FAR struct spirit_library_s *spirit,
  * Name: spirit_irq_clr_pending
  *
  * Description:
- *   Clear the IRQ status registers.
+ *   Clear all IRQ status registers.
  *
  * Input Parameters:
  *   spirit - Reference to a Spirit library state structure instance