Modbus

Tai lieu mo phong AVR. co the tham khao mot so thong tin de ung dung duoc.

avr单片机的串口程序，用于操作avr单片机的串口，可以实现发送接收字符、字符串。-SCM avr serial procedures, for the operation of single-chip serial avr can be achieved Send receive characters, strings.

系统由AT89C51、LED 数码管、按键、发光二极管等部分构成，能实现时间的调整、定 时时间的设定，输出等功能。系统的功能选择由SB0、SB1、SB2、SB3、SB4 完成。其中SB0 -System consists of AT89C51, LED digital tube, keys, light-emitting diodes and other parts, to achieve the adjustment of the time, will be When the time set, the output functions. Function of the system choose from SB0, SB1, SB2, SB3, SB4 completed. One SB0

单片机对DAC转换器的操作，很简便使用的。-Single-chip DAC converters on the operation, it is easy to use.

MCS５１和CH374做USB主机与HID设备通信-MCS51 and CH374 to do USB host and HID equipment communications

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

本书是嵌入式系统不可缺少的工具

51单片机可在线编程多功能实验板使用手册 内附多个实验程序（供初学者参考）-51 Single-chip can be online programming multi-function board user manual containing a number of experimental procedures (for beginners reference)

蜂鸣器响 改变蜂鸣器的频率，通过改变延时时间 蜂鸣器的时间要是是靠延时来完成的-Buzzer buzzer ring to change the frequency by changing the delay time if the buzzer is the time to be completed by the time delay

Source for scanners barcode fu-Source for scanners barcode full