| Along with the development of communication technology, wireless digital communication application domain expands unceasingly, especially in the urban construction of intelligent transportation systems, adopting the monitoring system of the public has been gradually in domestic cities pilot construction. But for now the taxi scheduling system is still the basic use of early VHF/UHF communication means with shortwave, ultrashort voice communications channels, the basic function already can not adapt to the current operation monitoring data transmission of digital needs.This paper focuses on the kind of situation, put forward a kind of solution, using a digital demodulation technology combining common car FM radio transceivers for second modulation to transmit digital information in simulate channel, this scheme both effective use of the existing equipment, and meet the modern scheduling monitoring system of high-speed data transmission.The subject bases on ARM7 processor LPC2365 embedded microcontroller as the core to design based the on-board scheduling hardware terminal. Introduces the CMX909B demodulation chip ,microprocessor control unit LPC2365 and power circuit, reset circuit, dial JTAG debugging code switch circuit and UART function modules hardware design. In the software design is briefly introducedμC/OS-II embedded real-time operating system, completeμC/OS-II based on ARM7 - TDMI system startup code design, realize the chip drive initialize program design. Including the T2365 driver software,μC/OS-II initial configuration of the operating system, data sending programs and data receiving application design etc.Embedded on-board communication platform of scheduling design, both theory and practice has strong advancement and practicability, its development and application prospect of very optimistic, along with the continuous development of embedded technology, it will be used in the communication and more control. |
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