Among the standalone commercial RTOSs, QNX has established itself as a major brand name and enjoys great popularity in a wide array of data acquisition and control applications. Thus, it was an easy decision for UEI to write drivers that work specifically with that environment.

UEI's support for QNX takes a special form due to that OS's architecture. The QNX SDK includes all the definition files and libraries you need to link into an application. Further, you get startup code as well as example programs with C source code that illustrate both software-clocked and hardware-paced analog inputs.

Implementing a QNX driver is different than working with Windows or Linux drivers. QNX allows applications with root privileges to directly access PCI bus addresses and resources including interrupts. Thus the driver contains no read()/write()/ioctl() routines. We've implemented the PowerDAQ/DNA for QNX data acquisition and control driver as a library to link with user back-end applications (server).

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