STIR_OUTPUT_HEADER_SIZE
IRDA_MAX_FRAME_SIZE + STIR_OUTPUT_HEADER_SIZE,
#define MAX_USTIR_OUTPUT_FRAME (2*IRDA_MAX_FRAME_SIZE + IRDA_MAX_EBOFS + STIR_OUTPUT_HEADER_SIZE + 4)
sirlength = irda_sir_frame(&wrbuf[STIR_OUTPUT_HEADER_SIZE],
STIR_OUTPUT_HEADER_SIZE,
btlen = STIR_OUTPUT_HEADER_SIZE + sirlength;