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由单片机89c2051模拟IIC和ZLG7290实现键盘的识别驱动程序。-89C2051 simulated by the single-chip IIC and realize ZLG7290 identification of the keyboard driver.

单片机仿真软件proteus做的蜂鸣器例子，有助于在具备硬件情况下学习单片机-microcontroller simulation software lic do buzzer example, with the help of learning hardware MCU

《单片机原理与实用技术》第2章-"SCM principles and practical technology" Chapter 2

用C实现数字电压电流表：1、由外部输入直流电压电流，电压范围20V，电流范围1A； 2、电压/电流通过开关切换； 3、显示：数码管显示电压值/电流值，精度0.01。 -Implementation using digital voltage ammeter C: 1, by the external input DC voltage and current, voltage range of 20V, the current scope of 1A 2, voltage/current through the switch 3, Display: Digital display voltage/current value, the accuracy of 0.01.

RS-485接口具有较强的抗干扰性，数据传输的距离较远，在一些应用中常常需要把RS-232标准的信号转换为RS-485的标准信号进传输。图中所示电路允许数据在RS-232/RS-485这两个不兼容的串行数据接口间传递。传输速度为480波特时，传输距离可达1750米。图中双RS-232收发器IC1将主机(PC)输出的RS-232电平转换为TTL电平，驱动高速RS-485收发器IC2 的输入，倒相器使IC2、IC3在受到起始位时被激活。-RS-485 trying to lay all the thoroughly bleed at the nose picking up the birthday 扰 fern cavity 强 ， Chu Huai basin cavity beat escapement for the birthday candle远Now ， Which instance, using Beckmannia中

rp89comdd mcs51单片机源码一堆-rp89comdd mcs51 SCM source heap

keil C51 ISR事例-ISR stories

高速电路的信号完整性问题，共同学习，有借鉴意义-Based on the Signal Integrality theory, the key problem met during signal processing module design and its solution is given

void InitGoertzel(void) 作用：初始化算法参数 用法：采用算法进行检测前执行一次，如果需要改变参数，调用SetParameter() float CGoertzel::GetMagnitude(unsigned char * sampleData, int length) //算法主接口 作用：对采集下来的音频数据用算法处理，返回一个结果 参数：sampleData－音频数据缓冲地址指针； length-缓冲区尺寸(音频数据数量),字节数； 返回值：返回算法结果。 void SetParameter(DWORD set_SampleRate, DWORD set_TargetFreq, DWORD set_BlockSize) 作用：设置算法参数； 参数：set_SampleRate-音频数据抽样速率； set_TargetFreq-目标信号频率； set_BlockSize－算法数据块尺寸(采样点)； 用法：调用本函数后，需要调用一次InitGoertzel(void)才会生效-void InitGoertzel (void) function: initialization algorithm parameters Usage: The algorithm performs a pre-test, if the need to change the parameters, calling SetParameter () float CGoertzel:: GetMagnitude (unsigned char* sampleData, int length)// Algorithm for the main interface role: to collect audio data from the treatment algorithm to return a result parameter: sampleData-audio data buffer address pointer length-buffer size (the number of audio data), number of bytes return value: the return of

此为友善之臂micro2440板的底板原理图，更新时间是2009年2月28日。-This is a friendly arm on the Backplane board micro2440 schematic, update time is February 28, 2009.