| The application of Internet exists everywhere in our life. The main objects connecting with Internet have changed and in addition to computers, embedded equipments are trying to do it which produces the technology of Embedded Internet. While many people domestic and overseas are focusing on combing embedded systems with Internet, some difficulties still exist including: on the one hand, many communication protocols of Internet raise higher demand of memory and operation speed, while many existing 8-bit and 16bit MCU(micro controller unit), except 32-bit MCU, have difficulties in running TCP/IP protocols; on the other hand, there are various kinds of MCU in the fields of application of embedded system and if you want to realize the networking function on MCU, you have to be very familiar with the framework specialty of this type and relating programming language, but there are some differences between different types of MCU.Combining the development of Embedded Internet at present, the solution of Embedded Ethernet Gateway was put forward based on the Ethernet networking controller and 32-bit MCU. The solution makes use of ENC running protocols of physical layer and data link layer and 32-bit MCU running TCP/IP protocol stacks. The module in the form of gateway realizes the function of transformation of Ethernet frames and RS232 serial datum providing the possibility of many embedded system with RS232 serial port connecting with Internet. |
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