WhaleTeq SECG(Single Channel ECG System) SDK for Linux platform:
0. SECG USB connection on Linux:
   A. "/dev/ttyACM0" would be linked after the SECG device be connected through USB cable:
   [cloud-user@localhost dev]$ ls -l ttyA*
   crw-rw----. 1 root dialout 166, 0 Feb 21 09:57 ttyACM0

   B. Add user account into "dialout" group to grant access permission for "/dev/ttyACM0":
   [cloud-user@localhost dev]$ cat ttyACM0
   cat: ttyACM0: Permission denied
   [cloud-user@localhost dev]$ sudo "usermod -a -G dialout cloud-user"
   [cloud-user@localhost dev]$ cat ttyACM0

1. Build Environment:
   Linux version : 2.6.32-696.el6.x86_64
   gcc version : 4.4.7

2. Package Structure:
   Header : SECG_SDK/include/WhaleTeqSECG_SDK.h
   32 bits library : SECG_SDK/lib/libSECG_SDK.so
   64 bits library : SECG_SDK/lib64/libSECG_SDK.so

3. Compiler Defined (-D) for WhaleTeqSECG_SDK.h : LINUX_GCC
#ifdef WHALETEQSECG_SDK_EXPORTS
#  ifdef LINUX_GCC
#    define WHALETEQSECG_SDK_API __attribute__ ((visibility ("default")))
#  else
#    define WHALETEQSECG_SDK_API __declspec(dllexport)
#  endif
#else
#  if defined(LINUX_GCC) || defined(ANDROID)
#    define WHALETEQSECG_SDK_API
#  else
#    define WHALETEQSECG_SDK_API __declspec(dllimport)
#  endif
#endif

4. Thread for "TimeAmplitudeCB" :
   WHALETEQSECG_SDK_API void RegisterTimeAmpCB(TimeAmplitudeCB cb);
The callback would be triggered from another thread. Please take care the GUI thread limitation if do GUI drawing in "TimeAmplitudeCB" for output signal display.