Description: A whole has been unable to find the source. It was written to help a friend host a telephone. In order to test, but also specifically to buy a telephone exchange. KEIL C-based operating system of the telephone ringing RTXTiny testing procedures. LPC900 microcontroller series. This procedure can not be directly used, but sufficient to describe the problem. If you want to use you need to define the contents of the relevant variables, such as
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单片机检测电话振铃程序.txt
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