两片ADS7863与TMS320F28335的接口设计

Design on Interface Between the Two Pieces of Serial AD Converter ADS7863 and TMS320F28335

为了实现DSP芯片与串行A/D芯片的多信号通信,设计了TMS320F28335的多通道缓冲串口(McBSP,Multi-channel Buffered Serial Port)与两片串行A/D转换器ADS7863的硬件与软件接口。在硬件接口设计中两片ADS7863与同样的McBSP引脚连接,A/D转换结果被同一个数据接收引脚接收。该系统设计可以使DSP扩展更多的ADS7863芯片,从而可以采集更多的信号。其次,该设计中A/D转换器与McBSP串口直接相连,不需要占用并行数据总线,避免了总线冲突。通过在CCS环境下编程、调试,得到了满意的实验结果,验证了该接口设计的正确性。

The hardware and software interface between TMS320F28335（McBSP,multi-channel buffered serial port） and two pieces of ADS7863 is designed for the realization of multi-signal communication between DSP and serial A/D converter.In this hardware interface design,two pieces of ADS7863 is conected to the same McBSP pins,and A/D conversion results are received by the same data receiving pin.The system design could make the DSP expand more ADS7863 chips and thus collect more signals,and furthermore,the A/D converter is directly connected to the serial port McBSP,occupying no parallel data bus and avoiding bus conflict.Through CCS environment programming and debugging,satisfactory experimental result is achieved,and the correctness of interface design verified.