HamsterBear F1C200s v5.17 Linux RTL8188EUS 適配
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平臺- F1C200s -
Linux版本- 5.17.2 -
Buildroot- v2022.2
底板做了USB HUB， 用的是FE1.1s，一共做了4路，其中一路拿來連wifi模組，另外
3個直接做成了USB Type-A介面
進入 kernel menuconfig 開啟如下選項
（該驅動位於staging下，選擇編譯進核心）
buildroot中選擇如下軟體包
（主要是net-tools iw工具包）
啟動系統後
1. 修改musb 為host模式
echo host > /sys/devices/platform/soc/1c13000.usb/musb-hdrc.1.auto/mode
[ 1379.560411] phy phy-1c13400.phy.0: Changing dr_mode to 1
[ 1380.223933] usb 1-1: new high-speed USB device number 2 using musb-hdrc
[ 1380.405841] hub 1-1:1.0: USB hub found
[ 1380.409764] hub 1-1:1.0: 4 ports detected
[ 1380.833942] usb 1-1.1: new high-speed USB device number 3 using musb-hdrc
[ 1381.146412] r8188eu: module is from the staging directory, the quality is unknown, you have been warned.
[ 1381.170314] Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_D_CUT_1T1R_RomVer(0)
[ 1381.205020] EEPROM ID = 0x8129
[ 1381.212399] usbcore: registered new interface driver r8188eu
ip addr 可以看到對應wifi介面
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: usb0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 52:8c:6f:55:1f:64 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 54:ef:33:d6:5e:72 brd ff:ff:ff:ff:ff:ff
2. 連線到wifi
上電
# ifconfig wlan0 up
[ 1687.899356] R8188EU: Firmware Version 11, SubVersion 1, Signature 0x88e1
[ 1688.274263] MAC Address = 54:ef:33:d6:5e:72
掃描附近wifi
# iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 8C:DE:F9:EC:55:8B
ESSID:""
Protocol:IEEE 802.11bgn
Mode:Master
Frequency:2.422 GHz (Channel 3)
Encryption key:off
Bit Rates:144 Mb/s
Quality:0 Signal level:0 Noise level:0
Cell 02 - Address: 96:DE:F9:EC:55:8B
ESSID:"kernelbot"
Protocol:IEEE 802.11bgn
Mode:Master
Frequency:2.422 GHz (Channel 3)
Encryption key:off
Bit Rates:144 Mb/s
IE: Unknown: DD820050F204104A0001101044000101103B00010310470010876543219ABCDEF012340AA3C33C838F102100067869616F6D69102300045241383110240004303030321042000531323334351054000800060050F2040001101100135849414F4D495F524F555445525F4755455354100800020000103C0001031049000600372A000120
Quality:0 Signal level:0 Noise level:0
連線到wifi
# iwconfig wlan0 essid kernelbot
# iwconfig
lo no wireless extensions.
usb0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"kernelbot" Nickname:"<WIFI@REALTEK>"
Mode:Managed Frequency:2.422 GHz Access Point: 96:DE:F9:EC:55:8B
Bit Rate:72.2 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=100/100 Signal level=0 dBm Noise level=0 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
請求ip
# udhcpc -i wlan0
udhcpc: started, v1.35.0
udhcpc: broadcasting discover
udhcpc: broadcasting select for 192.168.19.234, server 192.168.19.1
udhcpc: lease of 192.168.19.234 obtained from 192.168.19.1, lease time 43200
deleting routers
adding dns 192.168.19.1
嘗試訪問外網(沒接天線)
# ping baidu.com
PING baidu.com (220.181.38.148): 56 data bytes
64 bytes from 220.181.38.148: seq=0 ttl=50 time=201.784 ms
64 bytes from 220.181.38.148: seq=1 ttl=50 time=225.148 ms
64 bytes from 220.181.38.148: seq=2 ttl=50 time=15.126 ms
64 bytes from 220.181.38.148: seq=3 ttl=50 time=116.496 ms
64 bytes from 220.181.38.148: seq=4 ttl=50 time=115.356 ms
64 bytes from 220.181.38.148: seq=5 ttl=50 time=21.000 ms
64 bytes from 220.181.38.148: seq=6 ttl=50 time=114.353 ms
64 bytes from 220.181.38.148: seq=7 ttl=50 time=122.406 ms
^C
--- baidu.com ping statistics ---
8 packets transmitted, 8 packets received, 0% packet loss
round-trip min/avg/max = 15.126/116.458/225.148 ms
更多玩法
1. MQTT與上位機通訊
大概業務就是 掃描感測器資料上報給上位機
上位機也可以指定從機行為
2. 移植瀏覽器訪問網頁
3. 掛載主機NFS檔案系統
4. 做內網WEB伺服器
5. 暫時沒想到
總結以及遇到的一些問題
總結
因為一開始設計思路就比較清晰，所以整個過程還是比較順利的，底板設計的時候，因為
粗心大意連錯了線，所以又再版了。
核心 buildroot那兩塊等有空再寫詳細點。
有問題可以聯絡我郵箱(writeforever@foxmail.com)
問題
- 模組上電後掃描自動斷開連線
後來發現是供電不夠，一開始一直用電腦USB介面供電，但那個最大電流貌似就500mA，
換了個充電頭就ok了。