| Along with our country economic development, urbanization process accelerated, people get higher requirement for urban infrastructure, the traditional static is the bus stop already cannot satisfy the passengers, then puts forward the concept of electronic bus stop. Is the so-called electronic stop, is a dynamic way, on the basis of the traditional stop for passengers in a timely manner to provide vehicle arrive station, vehicle delay, and so on and so forth, convenience of passengers, improve the level of social service and quality. However, most of the electronic bus stop is exposed to outdoors, and because the site environment of controllable, tend to the operation of the electronic bus stop have an impact. Therefore, how to improve the electronic stop forecast accuracy, and reduce the failure rate and enhanced electronic stop forecast stand effect has very important meaning and function.This thesis mainly studies LED control card of the electronic bus stop board system robustness improvement, forecast stand effect of improvement and enhancement of communications stability.LED control card with 2 g/3 g GPRS network as the data medium, UPD as communication protocol, RS232/485 as internal transport, STM32F103 to stmicroelectronics company Crotex-M3 chip as the main control chip, Altera company's EP1C3T144 chip as control chip. Among them, on the basis of the UDP protocol is improved to enhance the stability of the communication and efficiency, in view of the LED display by transplanting the algorithm to improve the efficiency of the show, in the FPGA reduces the complexity of the system, and in view of the outdoor electronic bus stop on robustness was improved.Finally, the whole bus electronic stop after optimization, the system test in the practical application, the type of bus electronic stop has passed the test, and multiple cities in JiangSu, AnHui and other provinces in operation, running in good condition, citizens reflect a positive. |
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