NBOOT1st

基于51单片机的电能表软件设计，电能测量芯片是ATT7022C，有完整的读写和校表程序，已通过测试。(SCM based on the 51 Meter software design, power measurement chip ATT7022C, and write a complete calibration procedures, it has been tested.)

msp430 program for flash read write and copy from ram to flash

SMSC公司USB3300芯片评估板原理图、datasheet、STM32代码(SMSC corp s USB3300 chip sch, datasheet and sourcecode for STM32 MCU)

三天入门 Cortex-M4 ----Kinetis(正式版)，PDF文件，野火Kinetis开发教程，主要有 IAR的使用教程、Kinetis启动流程讲解、野火K60库的调用 三个部分组成。(Three days entry Cortex-M4---- Kinetis (official version), PDF file, wildfires Kinetis development tutorials, mainly use the IAR tutorial, Kinetis start the process to explain, wildfires K60 library calls three parts.)

使用stm32的滴答定时器辅助实现按键非阻塞扫描，响应及时，不阻塞占用cpu，值得新手学习(Use STM32 tick timer to help button non blocking scanning, respond timely, do not block up occupying CPU, worthy of novice learning.)

NRF905程序，基于STM32F101开发的NRF905串口透明传输程序，里面有自动进入待机模式，(NRF905 program based the STM32F101 the development of NRF905 serial transparent transfer program, which automatically enter standby mode)

说明：  STM32103+SHT31温湿度传感器检测温湿度值(Detection of Temperature and Humidity Value by STM32103+SHT31 Temperature and Humidity Sensor)

说明：  用STM32F103C8T6的3组串口，分别连接cdebyte的无线收发模块，usar1接收到上位机命令，通过usart2向下转发，USart2接收到下位机数据，再由USart1向上转发， 实现中继转发功能。(Three groups of serial ports of stm32f103c8t6 are used to connect the wireless transceiver module of cdebyte. Usar1 receives the command from the upper computer, usar2 forwards downward, usar2 receives the data, and then usar1 forwards upward to realize the relay forwarding function.)

NuttX I2C demo代码，基于Atmel SAMV71 XPlained Pro平台，NuttX内核版本V7.23(I2C demo source code for NuttX RTOS based-on Atmel SAMV71 XPlained Pro, NuttX kernel version was 7.23)

说明：  专门针对周立功Smart2200开发板的引导程序。(Specifically for weeks Smart2200 Ligong development board of the boot.)