CC3D - Add Buzzer support to PA15.

See Docs for details.

docs/Buzzer.md

@@ -20,3 +20,16 @@ Example of a known-working buzzer.
 
 http://www.rapidonline.com/Audio-Visual/Hcm1205x-Miniature-Buzzer-5v-35-0055
 
+## Connections
+
+### Naze32
+
+Connect a supported buzzer directly to the BUZZ pins.  Observe polarity.
+
+### CC3D
+
+Buzzer support on the CC3D requires that a buzzer circuit be created to which the input is PA15.
+PA15 is unused and not connected according to the CC3D Revision A schematic.
+Connecting to PA15 requires careful soldering.
+
+See the CC3D - buzzer circuir.pdf for details.

src/main/target/CC3D/target.h

@@ -29,6 +29,11 @@
 #define GYRO
 #define INVERTER
 
+#define BEEP_GPIO GPIOA
+#define BEEP_PIN Pin_15 // PA15 (Beeper)
+#define BEEP_PERIPHERAL RCC_APB2Periph_GPIOA
+
+
 // #define SOFT_I2C // enable to test software i2c
 // #define SOFT_I2C_PB1011 // If SOFT_I2C is enabled above, need to define pinout as well (I2C1 = PB67, I2C2 = PB1011)
 // #define SOFT_I2C_PB67