c - what does this code mean ? -

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i'm reading project , , found code, don't unterstand. 

#define out_pins            {x2_pin, pioc, id_pioc, pio_output_0, pio_default}, \                     {y2_pin, pioc, id_pioc, pio_output_0, pio_default}, \                     {z2_pin, pioc, id_pioc, pio_output_0, pio_default}

the program running on sam3s cortex m3 atmel .

x2_pin , y2_pin , z2_pin defined .

can explain o me out_pins ?

out_pins macro defined 2d array values. check following example better understanding.

eg: int *op[] = {out_pins } similar 

int *op[] = {{x2_pin, pioc, id_pioc, pio_output_0, pio_default}, \                     {y2_pin, pioc, id_pioc, pio_output_0, pio_default}, \                     {z2_pin, pioc, id_pioc, pio_output_0, pio_default}}

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