mbed library sources, mbed-dev only for TYBLE16

Fork of mbed-dev by mbed official

Please refer flowing link.
/users/kenjiArai/notebook/tyble16-module-will-become-a-mbed-family--mbedliza/

Revision:
169:e3b6fe271b81
Parent:
168:9672193075cf
Child:
170:19eb464bc2be
--- a/drivers/SPI.h	Thu Jul 06 15:42:05 2017 +0100
+++ b/drivers/SPI.h	Wed Jul 19 17:31:21 2017 +0100
@@ -271,6 +271,12 @@
     int _bits;
     int _mode;
     int _hz;
+
+private:
+    /* Private acquire function without locking/unlocking
+     * Implemented in order to avoid duplicate locking and boost performance
+     */
+    void _acquire(void);
 };
 
 } // namespace mbed