usps_cmd
usbd_status usps_cmd(struct usps_softc *, uint8_t, uint16_t, uint16_t);
usps_cmd(sc, USPS_CMD_GET_FIRMWARE, 0, 2);
usps_cmd(sc, USPS_CMD_GET_SERIAL, 0, 3);
if (usps_cmd(sc, USPS_CMD_GET_TEMP, 0, 2) != 0) {
if (usps_cmd(sc, USPS_CMD_GET_VOLTAGE, 0, 1) != 0) {
if (usps_cmd(sc, USPS_CMD_GET_FREQ, 0, 8) != 0) {