embedded - strange #define statements in C -


i have embedded c source code. in it's definitions, has lot of #define lines following:

#define xnv_spi_tx(x)               st(u1csr &= 0xfd; u1dbuf = (x);)

any idea st( ) means , does? using iar compiler , toolchain.

thanks comments, here found:

/* (the while condition below evaluates false without generating  *  constant-controlling-loop type of warning on compilers.)  */ #define st(x)      { x } while (__line__ == -1)

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