Based On The Mcf5213 The Intercom System Design And Realization

Walkie-Talkie is one kind of two way radio, it is widely used in people's daily lives. Through decades of development, the products of Walkie-Talkie now is mature and diversified. With the development of short-distance wireless communication technology, a new trend of the combination of Walkie-Talkie and the new short-distance wireless communication technology is shown, such as Walkie-Talkie which used ZigBee technology. Besides, the combination of Walkie-Talkie with voice codec technology, and design specific function for a specific customer is also in exploration, and it is full of important research value and application significance.This paper simply introduces short wireless network technology of ZigBee and G.726 protocol. Compared with other short-distance wireless communication technology, ZigBee technology has the features of lower transceiver power, lower data rate, lower cost and lower power consumption. G.726 protocol is widely used in product development industry. The G.726 protocol contains 4 speeds, such as: 16kbps, 24kbps, 32kbps, 40kbps. According to the different demands of products development, we can choose the suitable speed. G.726 protocol reduces the speed of the voice, and does not destroy the original sound.Based on a well analysis of ZigBee technology standard and G.726 protocol, the paper presents a scheme of design and implementation of Walki-Talkie system terminal on Freescale MCF5213 microprocessor platform.Compared to the other design program of Walie-Talkie system, this design is easy to realize with low cost and well avoidable interference performance, It is suitable for wireless voice communication in home and office environment. Now, this design has been realized on the Freescale processor platform.This paper focus on introducing the overall design concept of the Walkie-Talkie, contains the hardware platform and the integration of the software module. It introduces in detail porting theμC/OS-II operating system onto hardware platform, writing and testing hardware module drivers, and designing and realizing application software of the Walkie-Talkie. Multi-level optimization has been realized to the software,not only the codes are reduced,but also the operating efficiency is improved, and it also introduces a scheme on reducing packet loss and improving the avoidable interference performance.This paper also presents system testing methods and testing results, unit tests are used to test the correctness and stability of each unit module. In the process of integration testing, it focuses on packet loss rate.Test results show that the system can perform the function of audio expected.