嵌入式系統(tǒng)中串行通信的使用十分廣泛?？墒?a href='http://qiaming.cn/soft/data/21-22/' target='_blank' class='arckwlink_none'>嵌入式主機(jī)的串口數(shù)量卻十分有限。這在需要集成多個(gè)串口設(shè)備的場(chǎng)合顯得十分掣肘。本文給出了嵌入式主機(jī)串口擴(kuò)展的兩種方法，希望能夠最大程度地解決串口不足的問題。本文的兩種方法均已實(shí)現(xiàn)，并使用在我們開發(fā)的GIS系統(tǒng)中。
關(guān)鍵字：串口 RS232 UART USB
Two Solutions of Embedded Devices’ Serial Port Expansion Jin Meng Wang Lisheng
（East China Normal University，Shanghai，200062，China) Abstract: The serial communication of the embedded systems is widely used. However, the amount of the serial port is limited. How can we do in the case of integration of multiple serial devices? This paper
shows two solutions of serial port expansion and tries best to resolve the scarcity of serial port. The two solutions have all been implemented and run in our GIS.
Keywords: Serial Port; RS232; UART; USB