usbgecko_command
value = usbgecko_command(USBGECKO_CMD_RECV_BYTE);
usbgecko_command(USBGECKO_CMD_SEND_BYTE | (c << 4));
usbgecko_command(USBGECKO_CMD_ID) == 0x0470;
usbgecko_command(USBGECKO_CMD_LED_ON);