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## 1. 下载micropython firmware 包

$ wget https://micropython.org/resources/firmware/ESP32_GENERIC-20241129-v1.24.1.bin

## 备份固件
$ esptool --baud 115200 --port COM5 read_flash 0x00000 0x200000 esp32_origin.bin

# 2. 清除
## win
$ esptool --chip esp32 --port COM5 erase_flash
## linux
$ esptool.py --chip esp32 --port /dev/ttyUSB0 erase_flash



## 3. 刷入micropython firmware
$ esptool --chip esp32 --port COM5 --baud 460800 write_flash -z 0x1000 esp32-20190125-v1.10.bin
$ esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 esp32-20190125-v1.10.bin

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import machine

machine.freq()          # 获取CPU当前工作频率
machine.freq(240000000) # 设置CPU的工作频率为 240 MHz

# network

import network

wlan = network.WLAN(network.STA_IF) # 创建 station 接口
wlan.active(True)       # 激活接口
wlan.scan()             # 扫描允许访问的SSID
wlan.isconnected()      # 检查创建的station是否连已经接到AP
wlan.connect('essid', 'password') # 连接到指定ESSID网络
wlan.config('mac')      # 获取接口的MAC地址
wlan.ifconfig()         # 获取接口的 IP/netmask(子网掩码)/gw(网关)/DNS 地址

ap = network.WLAN(network.AP_IF) # 创捷一个AP热点接口
ap.config(essid='ESP-AP') # 激活接口
ap.config(max_clients=10) # 设置热点允许连接数量
ap.active(True)         # 设置AP的ESSID名称

def do_connect():
    import network
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    if not wlan.isconnected():
        print('connecting to network...')
        wlan.connect('essid', 'password')
        while not wlan.isconnected():
            pass
    print('network config:', wlan.ifconfig())