76 lines
2.4 KiB
Plaintext
76 lines
2.4 KiB
Plaintext
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This directory is intended for project specific (private) libraries.
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PlatformIO will compile them to static libraries and link into the executable file.
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The source code of each library should be placed in a separate directory
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("lib/your_library_name/[Code]").
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For example, see the structure of the following example libraries `Foo` and `Bar`:
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|--lib
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| |--Bar
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| | |--docs
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| | |--examples
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| | |--src
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| | |- Bar.c
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| | |- Bar.h
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| | |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
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| |--Foo
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| | |- Foo.c
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| | |- Foo.h
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| |- README --> THIS FILE
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|- platformio.ini
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|--src
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|- main.c
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Example contents of `src/main.c` using Foo and Bar:
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```
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#include <Foo.h>
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#include <Bar.h>
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int main (void)
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{
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...
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}
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```
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The PlatformIO Library Dependency Finder will find automatically dependent
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libraries by scanning project source files.
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More information about PlatformIO Library Dependency Finder
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- https://docs.platformio.org/page/librarymanager/ldf.html
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在使用 ESP32 通过 USB 转串口芯片（如 CH340、CP2102、FTDI）与上位机通信控制舵机时，常见一个现象：
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1.ESP32 刚上电或复位后，上位机发送串口指令无响应；
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2.加入串口 RTS/DTR 信号线的“唤醒操作”后，通信恢复正常，舵机动作也变得可靠。
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产生原因：
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ESP32 芯片的启动和复位机制依赖两个硬件引脚：
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引脚 功能
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EN 低电平复位芯片
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IO0 低电平进入固件下载模式
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USB 转串口芯片通过 RTS 和 DTR 两条信号线控制 ESP32 的这两个引脚：
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RTS（Request To Send） 通常控制 EN（复位）；
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DTR（Data Terminal Ready） 通常控制 IO0；
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当 RTS 和 DTR 信号都为低电平时，ESP32 进入下载模式（等待烧录固件），而非正常运行模式。
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问题的本质
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上位机打开串口时，如果没有正确的 RTS/DTR 信号跳变，ESP32 可能卡在下载模式；
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此时，ESP32 不会运行主程序，导致串口指令无法被响应；
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唤醒操作即是人为让 RTS/DTR 先拉低（复位 ESP32），再拉高（启动运行），让 ESP32 正常启动。
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解决方案总结
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在上位机串口打开时主动唤醒 在 openSerialPort() 后设置 RTS/DTR，模拟复位流程。
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代码烧写
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1.使用vscode内的platformIO插件，安装后点击该软件
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2.使用build进行编译
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3.使用upload进行烧录
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