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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。
In order to realize multi-signal communication between DSP chip and serial A / D chip, the hardware and software interface of TMS320F28335 multi-channel Buffered Serial Port (McBSP) and two ADS7863 serial A / D converters . In the hardware interface design two ADS7863 and the same McBSP pin connection, A / D conversion results are received by the same data receive pin. The system design allows the DSP to expand more ADS7863 chips, which can capture more signals. Second, the design of the A / D converter and McBSP serial port directly connected, do not need to take up the parallel data bus, to avoid bus conflicts. Through the programming and debugging in CCS environment, satisfactory experimental results are obtained, which verifies the correctness of the interface design.