PX_MSEC_TO_USEC
#define PX_PME_TO_ACK_TIMEOUT (1000 * PX_MSEC_TO_USEC)
#define PX_LUP_POLL_INTERVAL (10 * PX_MSEC_TO_USEC)
delay(drv_usectohz(50 * PX_MSEC_TO_USEC));
delay(drv_usectohz(100 * PX_MSEC_TO_USEC));