说明：  MIC输入接ADC0809通道IN2，DAC0832输出接 扬声器。编程以每秒钟5000次的速率采集IN2输入的语音数据并存入内存，共采集60000个数据（录12秒），然后再以同样的速率将数据送 DAC0832使扬声器放音。
(MIC input channel ADC0809 access IN2, DAC0832 output next speaker. Programming to 5000 times per second the rate of acquisition in2 input voice data and deposited in the memory, a total of 60,000 data collection (recorded in 12 seconds) and then the rate of the same data sent to enable the speaker playback DAC0832.)