nodemcu 未定义常量 uart.PARITY_NONE

问题描述

我遇到了与此问题中发布的相同的问题,除了 uart.STOPBITS_1 已定义而 parity_NONE 未定义:

nodemcu uart undefined constants?

>
uart=require("uart")
>
=uart
table: 0x4028d530
>
=print(uart.parity_NONE)
nil
>
=uart.STOPBITS_1
1
> 

当前固件

NodeMCU 3.0.0.0 built on nodemcu-build.com provided by frightanic.com
    branch: release
    commit: 136e09739b835d6dcdf04034141d70ab755468c6
    release: 3.0.0-release_20210201
    release DTS: 202102010145
    SSL: true
    build type: float
    LFS: 0x0 bytes total capacity
    modules: adc,bit,file,gpio,net,node,tmr,uart,wifi,tls
 build 2021-03-17 08:20 powered by Lua 5.1.4 on SDK 3.0.1-dev(fce080e)

测试代码

    uart=require("uart")
    print(uart.STOPBITS_1)
    print(uart.parity_NONE)
    uart.setup(0,19200,8,uart.parity_NONE,uart.STOPBITS_1,0)

错误:stdin:1: 'setup' 的错误参数 #4(预期的数字,没有)

解决方法

问题已解决,奇偶校验区分大小写,所以应该是:

install.packages("utf8")