引脚烧录说明
| USB TTL | ESP8266 |
|---|---|
| VCC(3.3V) | VCC |
| VCC(3.3V) | EN(运行时也是高电平) |
| GND | GND |
| GND | GPIO 15(运行时也是低电平) |
| GND | GPIO 0(运行时断开) |
| RX | TX |
| TX | RX |
注意：如果芯片处于运行模式，烧录的时候。插拔一次 VCC 复位进入烧写模式，引脚插拔需要在断开 VCC 以后进行
参考内容
- https://blog.csdn.net/C_huamao/article/details/108628080
- https://www.cnblogs.com/Tangledice/p/7067214.html
- https://blog.csdn.net/zuoguaishouxiao/article/details/106446729
- https://www.cnblogs.com/arrive/p/10281757.html
- http://docs.gizwits.com/zh-cn/deviceDev/ESP8266 串口烧写说明.html
- https://blog.csdn.net/yunyin_link/article/details/77676886
- https://blog.csdn.net/weixin_43550752/article/details/116745028