Ajout FishPeper

OpenSky/board/xsr/README.md

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+# xsr-sb target
+
+##LEDs
+
+The XSR has a green and a red LED.
+
+##SBUS
+
+SBUS output is on USART1, TX pin is PA9, RX is PA10 but unused. SBUS is inverted leaving the board.
+
+##CC2500 Radio
+
+CC2500 is connected to SPI2, SCK is PB13, MISO is PB14 and MOSI is PB15.
+The CS pin is PA8, and the GDO2 pin is PA11 
+
+The XSR uses the Skyworks SE2431 range extender
+See: http://www.skyworksinc.com/uploads/documents/SE2431L_202410J.pdf
+
+Looks to be a similar design to this: http://www.ti.com/tool/CC2530-SE2431L
+
+Which means the RX pin selection is not needed (it is RX if TX is off)
+
+Either ANT can be used for both RX and TX.
+
+High is logic 1, Low is logic 0
+
+ANT (PB5) selection is 0 (left) or 1 (right)
+CTX (PA15) is 0 then RX LNA mode active, or 1 then tx mode
+CPS (PB3) is 0 then bypass mode is active, 1 is bypass off.
+CSD (PB4) with 1 to enable chip (0 = sleep)
+
+GDO2 is on PA11 
+
+##BIND
+
+Bind pin is attached to PC13, and pushing button pulls to ground.
+
+##EEPROM
+ 
+EEPROM is connected to PA0 (SCL) and PA1 (SDA) 
+
+Note that this is **NOT** an I2C port on the F1 so must use SOFT I2C
+
+Write enable pin is connected to PXX *TODO*
+
+##Analogue
+
+NOTE no analogue input for XSR, and no servo pins.
+
+##CPPM Output
+
+CPPM output is on PB12
+
+##Telemetry (Smart Port)
+    
+Smart port telemetry input is RX USART3 - RX on PB11, TX on PB10, this is a polling protocol, so TX is used too.
+
+The plan is to not enable the smart port protocol but use the older hub telemetry (D8) protocol, so that the unit can share a UART on the FC with SBUS!
+
+PB11 for RX and PB10 for TX both inverted once leaving board.
+Output Enable (OE) for TX is PA2, this will need to be pulled high to prevent transmissions on the sport line.
+
+TX (PB10) can then be used for debugging output (requires soldering to board before inverter). 
+