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Enable the receiver in the UART termios (options). #3
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In most systems, usually the CREAD bit is on, so the termios structure in the configuration inside the piksi_open() function typically works (for instance, in the case of a serial-to-USB adapter on a PC). We found that this is not the case with the beaglebone black (and probably many other embedded platforms). The bit must be set, otherwise in most cases (sometimes you might get lucky if the bit is ON from previous UART use by another program) the driver will not intercept the data.
Regards
George Terzakis and Jaime Conde
Dynium Robot