heart-rate-measurement3

说明：  利用定时/计数器T0从P1.0输出周期为1s的方波，让发光二极管以1HZ闪烁，设晶振频率为12MHz(The use of timer/counter T0 from P1.0 output cycle square wave 1s, so that the light-emitting diodes 1HZ blinking, set the crystal frequency is 12MHz)

根据对应的按键值，对应输出相应的电容值，并做掉电检测(According to the corresponding key value, corresponding to the output of the corresponding capacitance values ​ ​ and do brownout detection)

crc校验的一种计算方式，可以用于网络协议或串口、can协议的校验位计算，有封装好的函数(A calculation crc check can be used for network protocols or serial port, can protocol parity bit calculation, there is a good function package)

电动工具无刷电机控制解决方案，基于单片机控制的无刷电机驱动，可立即启停，高性能，低耗能，锂电池充电。(Electric tools brushless motor control solutions, brushless motor driver based on single chip microcomputer control, can immediately stop, high performance, low energy, lithium battery.)

说明：  本系统以单片机AT89C51为主体,由芯片插座、独立按键、74HC573驱动8位数码管显示、5V直流电源控制模块等组成。根据数字集成芯片的引脚特性以及集成芯片的真值表编写检测程序。该系统能完成14脚以内常用TTL74系列数字集成芯片的功能测试。(This system is the main body of the single-chip microcomputer AT89C51, the chip socket, independent buttons, 74HC573 Driver 8 digital control, 5V DC power control module and so on. According to the characteristics of the digital chip and the chip s true value, the program is written in the chip.. The system can complete the functional test of the TTL74 series digital IC chip in 14 feet.)

C8051F320 单片机是 Silabs 公司推出的带 USB Device 接口的增强型 51 单片机，其兼容传统 51 架构，并在此基础上大大增强。基于大多数电子工程师 都熟悉经典的 51 系列及其开发环境， 我们选定这颗 MCU 作为对象进行 USB 开 发，将更多人带入 USB 开发的大门。关于 C8051F320 内部资源详情，请查看 datasheet。 本开发板的重点是针对 USB 应用， C8051F 系列单片机其他外设开 发过程将被简化以节约用户的学习、开发成本(C8051F320 microcontroller is Silabs company launched an enhanced interface with USB Device 51 SCM, which is compatible with the traditional 51 architecture, and greatly enhanced on this basis. Based on most electronic engineers Are familiar with the classic 51 series and its development environment, we have chosen as an object USB MCU Fengyun open Hair, the more people into the USB development door. About C8051F320 internal resources, please see the datasheet. The focus is on the development board USB application, C8051F MCU open other peripherals Hair process will be simplified to save the user s learning, development costs. )

一个数字梯形，选择k条路线，每条路线从第一层的某个数开始，每次进入下一层到达左下或者右下的数字，直到最后一层为止。每条路线不能经过相同的路径，但是可以经过相同的数字节点。 输出一个整数，表示能得到的最大的k条路径经过的数字之和(A digital ladder, the K route, each route the first layer of a number, each time to enter the next layer to reach the left or right next to the number, until the final layer. Each route can not pass through the same path, but can pass through the same number of nodes. Output an integer representing the sum of the number of the largest K paths that can be obtained)

飞思卡尔CAN扩展帧通信,Can盒发送数据，单片机接受并返回数据(The Carle CAN extended frame communication, Can box to send data, the microcontroller to accept and return data )

BF51实验板CAN通信器件SJA1000驱动代码(BF51 experimental board SJA1000 CAN communication device driver code)

飞思卡尔的风单片机源程序，希望有帮助哦，记得好好刊登在用看(Freescale wind microcontroller source code, hope helpful Oh, I remember the good published in see)