Esp8266/Esp32 连接 WIFI

程序猿研究所 2021-04-12

2706

之前介绍过 NodeMCU 如何刷 Micropython 固件，刷入固件之后就可以使用 Mu 编辑器编写代码了，物联网最核心最基本的应该就是网络操作了，下面就来介绍 Micropython 连接 WIFI 上网。

所需材料：

一块 Esp8266/Esp32 开发板，这里使用 NodeMCU Esp32
Microusb 数据线

将 NodeMCU 连接到电脑上，打开 Mu 编辑器，在系统启动的时候会自动执行两个文件的脚本，一个是 boot.py, 一个是 main.py 。我们在 boot.py 文件中进行联网操作，使用 Mu 打开 boot.py，输入：

import gc
import network
gc.collect()


wlan = network.WLAN(network.STA_IF)
wlan.active(True)


if not wlan.isconnected():
    wifiName = "CMCC-PebQ"
    wifiPassword = "your wifi password"
    print('connecting to wifi network...')
    wlan.connect(wifiName, wifiPassword)
    print('wifi connected .')

编辑完之后将其拖到 NodeMCU 设备中，打开 Mu 中的 REPL，设备会自动执行 boot.py 中的程序开始连接网络：

clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:5008
ho 0 tail 12 room 4
load:0x40078000,len:10600
ho 0 tail 12 room 4
load:0x40080400,len:5684
entry 0x400806bc
;32mI (539) cpu_start: Pro cpu up.
I (539) cpu_start: Application information:m
I (539) cpu_start: Compile time:     Sep  2 2020 03:00:08
I (543) cpu_start: ELF file SHA256:  0000000000000000...0m
I (548) cpu_start: ESP-IDF:          v3.3.2m
I (553) cpu_start: Starting app cpu, entry point is 0x40082f30
I (0) cpu_start: App cpu up.m
I (564) heap_init: Initializing. RAM available for dynamic allocation:
;32mI (571) heap_init: At 3FFAFF10 len 000000F0 (0 KiB): DRAM
;32mI (577) heap_init: At 3FFB6388 len 00001C78 (7 KiB): DRAM
I (583) heap_init: At 3FFB9A20 len 00004108 (16 KiB): DRAM
0;32mI (589) heap_init: At 3FFBDB5C len 00000004 (0 KiB): DRAM
I (595) heap_init: At 3FFCA9E8 len 00015618 (85 KiB): DRAM
I (601) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (608) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (614) heap_init: At 4009DE28 len 000021D8 (8 KiB): IRAM
I (620) cpu_start: Pro cpu start user code
I (303) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (90) wifi:wifi driver task: 3ffd1148, prio:23, stack:3584, core=0
;32mI (486) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (486) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (526) wifi:wifi firmware version: 44aa95c
I (526) wifi:config NVS flash: enabled
I (526) wifi:config nano formating: disabled
I (526) wifi:Init dynamic tx buffer num: 32
I (526) wifi:Init data frame dynamic rx buffer num: 32
I (536) wifi:Init management frame dynamic rx buffer num: 32
I (536) wifi:Init management short buffer num: 32
I (546) wifi:Init static rx buffer size: 1600
I (546) wifi:Init static rx buffer num: 10
I (546) wifi:Init dynamic rx buffer num: 32
[0;32mI (646) phy: phy_version: 4180, cb3948e, Sep 12 2019, 16:39:13, 0, 0
I (646) wifi:mode : sta (98:f4:ab:00:a8:0c)
I (646) wifi: STA_START
connecting to wifi network...
wifi connected .
MicroPython v1.13 on 2020-09-02; ESP32 module with ESP32
Type "help()" for more information.
>>> I (1016) wifi:new:<3,0>, old:<1,0>, ap:<255,255>, sta:<3,0>, prof:1
I (1866) wifi:state: init -> auth (b0)
I (1866) wifi:state: auth -> assoc (0)
I (1876) wifi:state: assoc -> run (10)
I (1976) wifi:connected with CMCC-PebQ, aid = 3, channel 3, BW20, bssid = 90:47:3c:39:3b:81
I (1976) wifi:security type: 4, phy: bgn, rssi: -75
I (1976) wifi:pm start, type: 1


I (1986) network: CONNECTED
I (2006) wifi:AP's beacon interval = 102400 us, DTIM period = 1
[0;32mI (5976) event: sta ip: 192.168.1.12, mask: 255.255.255.0, gw: 192.168.1.1
I (5976) network: GOT_IP

如果有上面类似的输出就代表 WIFI 连接成功了，联网成功之后就可以使用 upip 来安装扩展，在 REPL 中输入：

>>> import upip
[0;32mI (17586) modsocket: Initializing
>>> upip.install('micropython-urequests')
Installing to: lib/
Warning: micropython.org SSL certificate is not validated
Installing micropython-urequests 0.6 from https://micropython.org/pi/urequests/urequests-0.6.tar.gz

通过 urequest 请求 api :

>>> import urequests as uq
>>> res = uq.get("http://api.example.com")
>>> res.text
'{"code":0,"data":{"title":"poetry api server","version":"0.1.0","stage":"prod"},"msg":"ok"}'
>>> res.json()
{'code': 0, 'data': {'title': 'poetry api server', 'stage': 'prod', 'version': '0.1.0'}, 'msg': 'ok'}

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Esp8266/Esp32 连接 WIFI

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