dac_spi

说明：  一本讲述proteus与51单片机仿真的书(A book about the simulation of Proteus and 51 single chip computer)

YM1602C液晶显示“OK!”字符串。(YM1602C displays the "OK!".)

该模块实现串口DMA发送中断接收，与系统或者外设通信，一发一答的方式，发送一帧数据，需等待对方应答，如果在规定时间内未等到ACK数据，发送端 会重发该数据，采用状态机制原理，对串口使用以及协议搭建很参考价值(The module DMA send serial interrupt receiving, and system or peripheral communication, one answer, send a frame of data, need to wait for the answer, if ACK did not wait until the data within the specified time, the sender will retransmit the data, using the state mechanism principle, build a reference value for the use of serial port and protocol)

利用定时器产生PWM，使LED灯由亮到灭，由灭到亮逐步变化( Use timer produce PWM, make the light to destroy LED lamp, the gradual change to light out )

用单片机产生频率，占空比可调的方波，这是C语言的原代码。(Produced with single-chip frequency, variable duty cycle square wave, which is the C language source code.)

RC500原厂代码，支持ISO14443A所有的层(RC500 original code to support all of the layers ISO14443A)

基于学习板的数字温度计设计程序，可以在数码管上动态显示实时温度，按键控制温度范围，可以使用蜂鸣器报警等。(Based on the study of the board, can design program digital thermometer in digital displays real-time temperature on the tube, button control temperature range, can use the buzzer alarm and etc.)

使用奇异值分解算法的prony算法用于电机故障诊断(SVD algorithm prony algorithm for the motor fault diagnosis)

STM32L151的例程，包括ADC,DAC,DMA,PWM,EXTI等等，很全(STM32L151 routines, including ADC, DAC, DMA, PWM, EXTI, and so forth, very full)

说明：  使用Jk触发器实现PLL鉴频器电路 还没仿真测试 只作为参考(jk flipflop for PLL frequency discriminator)