[Paparazzi-devel] Question about gps.h

[Haiyang Chao]

Hi, guys.
We are trying to hook up a IMU with Tiny13 through UART1. But I have some questions while understanding the code about the GPS part.

(1) Where is the definition for function "ChAvailable()" used in "#define GpsBuffer() GpsLink(ChAvailable()) --- gps.h "? 
I used the command "address@hidden:~/paparazzi3$  grep -r -n 'ChAvailable()' *". But I still can  not find the definition. The only possible place is in  sw/airborne/arm7/uart_hw.h:46: #define Uart0ChAvailable(). But they have different names. Some tricks here?

(2) What is this "dev##_x"?  like /dev/ttyUSB0 in linux or what?
-----------------------------From gps.h---------------------------------------------
#define __GpsLink(dev, _x) dev##_x
#define _GpsLink(dev, _x)  __GpsLink(dev, _x)
#define GpsLink(_x) _GpsLink(GPS_LINK, _x)

(3) Do u guys know any good documentations about the paparazzi programming, especially the airbore code?

Thanks
Haiyang