Solar LED road lamp based on ZigBee remote online upgrade firmware

Embedded products put into use in stage due to various reasons need to maintenance or software upgrade of product, if use the traditional way of local application update, need to recall the products, increase the enterprise cost. If the embedded products placed in extreme environment, the traditional way of upgrading to. Therefore, research of embedded products online upgrade firmware is particularly important.

click upgrade data transmission in a different way, currently used online upgrade method can be divided into the embedded system and wireless transmission cable transmission. Common cable transmission mode is based on serial cable ¨ transmission and Ethernet connection. Cable transmission performance is stable, easy to use, but the upgrade nodes between the server and need to set up a special cable or Ethernet cable ( Equipped with network card) And the high cost; Commonly used wireless transmission mode based on GPRS/CDMA data transmission and data transmission based on wireless sensor network. Using GPRS/CDMA is connected to the Internet, convenient and reliable network upgrades, but communication module is expensive, require additional data traffic fee payment. Wireless sensor network upgrade mostly depend on the operating system provides the bootloader, code maintenance convenience, high accuracy, this method but upgrade operation is relatively complex, the operating system of higher hardware requirements.

this study, we propose a kind of embedded system based on ZigBee remote firmware online upgrade technology, and the author participated in the design of LED street lamp energy saving system of the remote online upgrade firmware program as an example, this paper introduces the process of online upgrade. Summary of

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the remote firmware upgrade, the upgrade code is ZigBee protocol used by wireless transmission. ZigBee is a kind of wireless network protocol, set by the ZigBeeAlliance ( Since 1998 development) , the bottom is the IEEE 802. 15. 4 standard media access layer and physical layer. Its main characteristic is low speed, low power, low cost, support a large number of network nodes, supports a variety of network topology, low complexity, fast, reliable and safe. Zig— Bee in the network equipment in accordance with the features of different can be divided into coordinator ( 协调器) And router ( 路由器) And terminal nodes, endde— 副) 。 Among them, the ZigBee coordinator ZigBee as initiator and maintainer of network management of the entire network, through the router connection relay, the coordinator can control coverage beyond its energy equipment.