Merge pull request #1493 from adustm/b96b_asyn_serial_new

B96B async serial

Author: 0xc0170

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_B96B_F446VE/device.h

@@ -40,8 +40,8 @@
 #define DEVICE_ANALOGOUT        1
 
 #define DEVICE_SERIAL            1
-#define DEVICE_SERIAL_ASYNCH     0
-#define DEVICE_SERIAL_ASYNCH_DMA 0
+#define DEVICE_SERIAL_ASYNCH     1
+#define DEVICE_SERIAL_ASYNCH_DMA 1
 #define DEVICE_SERIAL_FC         0
 
 #define DEVICE_I2C              1

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_B96B_F446VE/objects.h

@@ -74,6 +74,9 @@ struct serial_s {
     uint32_t parity;
     PinName pin_tx;
     PinName pin_rx;
+#if DEVICE_SERIAL_ASYNCH
+    uint32_t events;
+#endif
 };
 
 struct spi_s {