Research Of LWIP Transplantation In OS20 Operating System

Digital TV set-top box is the fastest growing and most popular technology research recently. Internet-based digital TV set-top box business is one of the most important applications.At present, the main processors of digital TV set-top boxes have two solutions, the MCU and the embedded systems. For the situation of SCM as the main processor, this paper realized a TCPIP stack on it. This paper uses the environment of the SCM system and the PC system. The SCM client software is Keil. The computer software is Visual Basic 6.0. Particularly, PC sends data through the serial port to SCM, MCU transmitted the data to the computer via ethernet, PC is responsible for testing and displaying the data received and gives the inspection reports. Experiments show that Ethernet transceiver package and ping command can be successfully performed.For the set-top boxes of embedded operating systems, this paper chooses STx5105 as the platform which is the solution of the company of ST, this paper realized a LWIP transplant network solution based on the network chip card DM9000A. LWIP is one kind of TCP / IP protocol which means Light-Weight TCP/IP stack. The main purpose of LWIP is to reduce the use of memory, so LWIP suites for small, limited resources such as embedded system processors. There are several modules in LWIP, in addition to TCP/IP basic modules (IP, ICMP, UDP, and TCP), it also contains supporting modules. These modules contain operating system simulation layer, buffer and storage subsystem, several network interface functions and so on. In order to facilitate the transplant to different operating system, LWIP packages all protocols into a single process, with the core operating system separately. The paper described the OS20 operating system, and elaborated on the packaging problem between LWIP and the OS20 operating system, the application layer and the driver layer.