Hi Valeria!

The FSM module in the TSC_ADC_SS can either get triggered by software or by 
an external hardware event (TIMER4-7 or PRU_ICSS pr1_host_intr0). See SRM 
chapter 12 <http://www.ti.com/lit/pdf/spruh73> for details.

The best way how to synchronize with an external clock depends on the clock 
frequency and the timming accuracy requirements. For high accuracy or above 
~10 KHz you may need customized software.

But below that frequency you may be happy with a simple solution: The ADC 
operates at a fast sampling rate and the host CPU just reads the current 
value when the external clock fires. This is feasible with libpruio 
<http://beagleboard.org/project/libpruio/>. (You may see some latency when 
the host CPU is busy by any system interrupt.)

BR

BTW: Cross-compiling adds further problems. Why not compiling on the BBB?

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