【摘要】 TMS320DM642(DM642)作为一款高性能的多媒体DSP有着广泛的应用。由于不具备通用异步串行收发接口(UART),使得与其他UART设备之间的通信存在困难。本文分析了异步串行通信的特点和其数据帧结构,利用片上同步多通道缓冲串行口(McBSP)和增强型直接存储器存取(EDMA)实现了UART功能。重点论述了McBSP与EDMA相关寄存器的初始化设置,发送接收数据的编解码软件处理等。该方法无需其他外部器件,硬件实现简单,程序流程简洁,丰富了DM642的接口功能,提高了其使用的灵活性。更多还原

【Abstract】 TMS320DM642(DM642)has been widely used as a high performance DSP for digital media applications.As with no universal asynchronous receiver and transmitter(UART)provided,it is difficult to communicate with other UART devices.In this paper,a method using the on-chip multichannel buffered serial port(McBSP)and enhanced direct memory access(EDMA)to emulate software UART is provided.The initialization of the McBSP and EDMA and the data coding/decoding in process of transmitting/receiving are discussed in detail.This method can be implemented with easy program flow and no other device.It enriches the DM642’s interface function and extends its application as well.更多还原