完成了基于TMS320VC5402 DSP的R5_485通信的硬件设计和软件编程.基于美国TI公司TMS320VC5402 DSP芯片的多通道缓冲口(McBSP)进行适当的硬件扩展,以SPI方式直接和MAXIM公司的MAX3100通用异步串行收发器接口,然后经Linear Technology公司的LTC 1480超低功耗RS_485收发器,从而实现了一种新的基于RS_485标准接口串行通讯的数据传输,充分利用了DSP的片上资源,使硬件和软件结构尽量简单化.%The hardware design and software programming of the RS_485 communication is completed based on the TMS320VC5402 DSP. In order to extend the hardware, designer connects directly the multi-channel buffered port (McBSP) of Texas Instrument's TMS320VC5402 DSP chip by the SPI mode with MAXIM's MAX3100 universal a-synchronous serial transceiver interface, and then get through Linear Technology's LTC1480 which is a low power RS _485 transceiver,thus achieve a new standard interface based on RS_485 serial communication. The design makes full use of the DSP on-chip resources to simplify the hardware and software architecture as much as possible. The paper presents a hardware connection principle diagram and introduces related software programming.
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