• RTXCusb Product Overview
• RTXCusb Host Solutions
• RTXCusb Device Solutions
• RTXCusb On-the-Go (OTG)
• Application Examples
  • Support a USB Memory Stick
  • Connect your system to a PC via USB
  • Add a WiFi connection via USB

These are some common applications for USB in an embedded system. Please contact your local Quadros Systems sales representative for information on other applications supported by RTXCusb software.

• Host and Device (Function) Support
  RTXCusb supports development on both sides of the USB bus. This solution includes host and device stacks, class drivers and controller drivers.
• Modular solution -- Choose only the components you need
  RTXCusb is designed to be a fully modular solution. Developers can license either the host stack or the device stack along with the class drivers and controller drivers they need for their application.
• Portable -- Use with any operating system
  RTXCusb has been designed to work closely with the RTXC Quadros real-time operating system; however the RTOS abstraction layer included with RTXCusb means it can be used with any kernel or operating system.
• Integrated with RTXC middleware
  RTXCusb can take full advantage of RTXC communications stacks and middleware. This includes integration between the RTXCusb mass storage class driver and RTXCfatfile embedded file system, and between RTXCusb CDC Ethernet class driver and the RTXC Quadnet TCP/IP stack.

Support a USB memory stick

You want to be able to attach a USB flash memory device to your existing embedded system to upload files to a PC. This is a common embedded application for USB technology. Your embedded system needs to function as a USB host. The memory stick is a USB device (function).

Software you will need to add to your embedded system:

1. RTXCusb Host Stack
2. RTXCusb Mass Storage Class Driver (host)
   Allows the USB host to recognize and write to a memory device
3. RTXCfatfile FAT file system
   Allows you to write files that are compatible with a PC
4. Real-time operating system
   1. Use the RTXC Quadros RTOS – already integrated with the above
   2. or your real-time operating system

Hardware will you need to add or have available

1. USB host controller
2. USB type A connector

Connect your Embedded System to a PC via USB

You want to be able to attach your embedded system to a PC so that a technician can read log files and perhaps do a firmware update.

In this scenario, the PC is the USB host. The embedded system is the USB device.

Software you will need to add to your embedded system:

1. RTXCusb Device Stack
2. RTXCfatfile FAT32 file system
   Allows you to write files that are compatible with a PC
3. RTXCftl File Translation Layer
   Allows a NAND device to be addressed as a set of standard 512 byte logical sectors so that a FAT32 file system can write to resident flash. The Flash translation layer also provides wear leveling and protection against data loss from power failure
4. Real-time operating system
   1. Use the RTXC Quadros RTOS – already integrated with the above
   2. or your RTOS needs to support tasks for use by USB

Hardware will you need to have on your system

1. USB device controller
2. USB type B connector on your board

NOTE: This implementation does not allow concurrent access to the resident Flash. The PC host and the embedded device will each need to reinitialize the file system before reading/writing to the Flash memory, and the embedded system needs to know not to attempt to write to the NAND flash while the PC is attached.

Add WiFi (WLAN) to your system via a USB connection*

You want to be able to attach a USB WiFi device to your existing embedded system to connect to a wireless network.

Software you will need to add to your embedded system:

1. RTXCusb Host Stack
2. RTXCusb CDC Ethernet Class Driver (host)
   Allows the USB host to transfer TCP/IP packets
3. RTXC Quadnet TCP/IP stack
4. The RTXC Quadros RTOS

Hardware will you need to add

1. USB host controller
2. USB type A connector on your board

*Quadros Systems also provides an SDIO stack to support WiFi, Bluetooth and other removable devices via an SD card slot.