65 lines
1.8 KiB
Markdown
65 lines
1.8 KiB
Markdown
# 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).
|
|
|