Dear Developers,

I am writing a real time thread function in which I need to use the
channel number. Take pid.c as an example, the number of channel =
num_chan. For each channel, we have exported

calc_pid(void* arg, long period).

by using

 hal_export_funct(bu, calc_pid, &(pid_array[num]), 1, 0, comp_id).

My question is in the function of calc_pid(void* arg, long period),
how can I know for which channel I am doing the calculations. As from
the arguments (void* arg, long period), there is no information
regarding the number of channel.

regards
Xuecheng

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