Initially, EyeTech used a commercial analog camera and computer to create a "window mouse" to control eye positioning. EyeTech eye tracking technology determines the line of sight from the pupil position and determines 850 nm infrared light from the human cornea. The technology was originally invented for disabled users to help them communicate more fully with the outside world. Includes disabled patients with ALS, cerebral palsy, muscular dystrophy, spinal cord injury, traumatic brain injury, and stroke. Because of the gaze tracking technology, the lives of people who are disturbed by these diseases have made a qualitative leap. There are a series of recommended videos on EyeTech. However, the size of the assistive technology market is relatively small, and EyeTech founder Robert Shap realized that if the implementation cost, scale, and energy consumption can be reduced, the technology may have a larger potential user base. Here are the goals of Sharp:
• Independent operation (no computer required)
• “Compact†size • Low power (< 5 w)
• Low cost (<200 USD)
• Superior eye tracking and positioning capabilities • Multiple operating system support • On-site upgrades • Reasonable development time and cost For typical embedded systems, these are not difficult. But when the algorithm needs to be processed by a computer, these goals have major design challenges. There is no doubt that Shap and his team will use the microcontroller if they can find a device with enough processing power. Faced with the existing x86 processor PC level code, it is clear that the above ideas are not easy to implement.
Sharp learned that the Xilinx Zynq SoC is the right equipment project. On the Zynq SoC chip, the dual-core ARM cortex-a9 MPCore processor can run existing computer-based code, recompile and provide an operational system. Then, to speed up the various parts of the code, Sharp's team's worst job performance task was handed over to the PL (Programmable Logic) on the Zynq SoC chip. It took two years to port the code, and the engineering team worked from two to four people, using part-time time to research projects.
Eventually, items that can be tracked can increase the product gaze frame rate from 40 to 200 + frames per second. Many line-of-sight tracking applications can accommodate slower frame rates, but some applications (such as testing brain damage) require faster frame rates and an accurate result.
This is the printed circuit board of AEye.
This is a fairly small board! The Zynq Z-7020 SoC is 17 mm wide and the board is only slightly higher than the Zynq SoC package. Note the size of the US coin on the right side of the picture above. Here is a hardware block diagram of the AEye board: 
This is how EyeTech assigns tasks to Zynq SoC's processing systems and programmable logic: 
Shap pointed out that because of the absolute division of hardware and software, the practicality of high-performance processing systems and programmable logic in the Zynq SoC helps create the ideal rapid development environment. To achieve a higher standard than the 200 fps frame rate, the design team must move tasks from the processing system to the programmable logic. How does line-of-sight tracking technology become mainstream? Each vehicle's line-of-sight tracking system helps fight driver fatigue; concentrates attention through chemical induction and helps people reduce their distraction on mobile phones and tablets. If the proof is valid, the insurance company may immediately lobby the new owner to install the tracking system. Is this a scene that appears in science fiction? Check out this Mesa, AZ TV News Channel 3 video.
(Note: This blog is a summary report. At the 2015 Embedded Visual Summit in Santa Clara, Xilinx's Robert Shap and Dan Isaacs made the above summary report.)
A Network switch is a type of network device used to connect multiple devices in a local area network (LAN). It can receive and forward data packets through physical or wireless interfaces, sending data packets from the source device to the target device. Network switches can identify and forward packets based on MAC addresses so that data can be accurately transmitted to the target device.
A network switch usually has multiple ports, each of which can connect to a device, such as a computer, server, printer, etc. When a device sends a packet, the switch forwards the packet to the corresponding port according to the MAC address of the target device, thus achieving communication between devices.
The network switch can also divide the virtual local area network (VLAN) into multiple logical subnets, so that different devices can communicate independently on the same physical network, improving network security and performance.
In short, a network switch is a network device used to connect and forward packets, which can realize communication and network management between devices. It is an important part of building local area networks and enterprise networks.
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