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README
Apache-2.0

EventOS项目说明

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邮箱:event-os@outlook.com,QQ群:667432915


一、EventOS是什么?

EventOS,是一个面向单片机、事件驱动的嵌入式开发平台。它主要有两大技术特色:一是事件驱动,二是分布式。EventOS的目标,是开发一个企业级的嵌入式开发平台,以事件总线为核心,打造一个统一、分布式的嵌入式技术生态,涵盖RTOS内核、IO框架、设备框架、文件系统和中间件,为广大企业用户和嵌入式开发者们,提供搞可靠性的、高性能的、现代且高开发效率的嵌入式开发环境。

经过几个月艰苦的开发,EventOS V0.2终于释放出Alpha版本,期间走了不少弯路。开源软件的艰辛,我终于品味一二。在V0.2中,EventOS实现了一个完整的嵌入式操作系统内核。

目前EventOS V0.2支持的功能与特性如下:

  • 内核与中断功能
  • 任务管理
  • 层次化状态机框架
  • Reactor框架
  • 定时器管理
  • 事件总线
  • 数据库
  • 线程锁

相比于V0.1,EventOS V0.2有了较大的修改,完全不再兼容V0.1。最大的修改,就是为了支持分布式特性,修改事件主题,从枚举类型,修改至字符串类型。

需要特别说明的是,为了加快EventOS的开发进度,EventOS内核中的e_kernel部分,是基于RT-Thread的内核,保留任务、定时器、信号量和线程锁,删除其他,整理、简化与修改而来。在此声明,需要EventOS的e_kernel部分,对RT-Thread的源码进行了大量的修改,但它仍旧遵循Apache-2.0开源协议,其版权属于RT-Thread开发团队。向RT-Thread团队的专业与开发精神,致以敬意和感谢!

二、EventOS的特色

1. 强大的事件系统

事件总线为核心组件,灵活易用,是进行线程(状态机)间同步或者通信的主要手段,也是对EventOS分布式特性和跨平台开发进行支持的唯一手段。事件支持通知型,块事件、流事件、时间事件等不同的类型,支持发布-订阅直接发送两种投递方式。

2. 事件机制与数据库的紧密结合

EventOS中,创新性的对事件机制与数据库,进行了充分的结合。二者的结合,衍生出了强大而友好的任务间通信机制,使用起来,远好于传统RTOS的邮箱或者消息队列。

3. 最大限度的兼容性

EventOS会对常见的处理器架构,如ARM Cortex、RISC-V等进行支持,并对常见的RTOS如FreeRTOS等进行支持,最大限度的兼容当前的嵌入式开发生态,使每一个想尝试EventOS的网友,以最小的代价迁移到EventOS平台。

EventOS支持的硬件平台:

  • ARM Cortex-M0/M0+
  • ARM Cortex-M3
  • ARM Cortex-M4
  • ARM Cortex-M7

EventOS支持的软件平台:

  • FreeRTOS
  • uC/OS-II
  • uc/OS-III
  • embos

EventOS支持的IDE和编译器:

  • MDK KEIL
  • IAR
  • STM32CubeIDE
  • GCC

4. 功能强大的软定时器和时间事件

EventOS不仅支持传统的软定时器,还以时间事件的形式,对软定时器功能,进行优雅且功能强大的实现。

5. 简约的基础设施

EventOS的远期目标,定位于可跨平台开发,并具备分布式通信能力的RTOS,因此其基础设施,都需要具备分布式能力。目前,EventOS支持任务、定时器、事件、KV数据库和线程锁五种基础设施。

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