6. CV184x RTL8189FS WiFi FlowDescription¶

This documentDescriptionin cv1842 etc. CV184x Platform RTL8189FS SDIO WiFi afterkernelandDevice TreeConfiguration （《Configuration Description》Chapter ）、Build Path，withand STA（wpa_supplicant）and AP（hostapd）User spaceToolsofPackageandBoard-levelUseFlow。

6.1. Build and Artifacts¶

Execute build_osdrv （or etc. Commands）after， Generate 8189fs.ko。Copyto rootfs ofPath osdrv of INSTALL_DIR ，for example：

install/soc_cv1842hp_wevb_0014a_emmc/rootfs/system/ko/3rd/8189fs.ko

willon Pathunderof 8189fs.ko Copyto canAccessContents（If /mnt/sd/）。Ifalreadyin menuconfig in Install the wireless driver ko，Image can alreadyInclude Module， No need to Copy。

6.2. Board-Level Wi-Fi Connection Flow¶

6.2.1. Prepare wpa_supplicant, hostapd, and Libraries (Development Host)¶

Description：wpa_supplicant and hostapd ， hostap BuildafterofInstallTree；SDK in Contentsis ramdisk/rootfs/public/wifi/musl_arm/ （and packages_arch=musl_arm ）。No need to under hostapd Install ，and wpa ，from ContentsCopy can。

If rootfs on Tools，in onPackage PleaseNote：FAT of SD not ，needCopy of so， Copy File 。

cd /path/to/your/sdk   # ReplaceisActual SDK  Contents
W=ramdisk/rootfs/public/wifi/musl_arm
rm -rf wifi_tools
mkdir -p wifi_tools
# STA
cp $W/usr/sbin/wpa_supplicant $W/usr/sbin/wpa_cli $W/usr/sbin/wpa_passphrase wifi_tools/
# AP（and wpa  Contents， Build ）
cp $W/usr/sbin/hostapd wifi_tools/
# If incan andPackage：hostapd_cli
test -f $W/usr/sbin/hostapd_cli && cp $W/usr/sbin/hostapd_cli wifi_tools/
cp $W/usr/lib/libnl-3.so.200.26.0 wifi_tools/
cp $W/usr/lib/libnl-genl-3.so.200.26.0 wifi_tools/
cp $W/usr/lib/libnl-route-3.so.200.26.0 wifi_tools/
cp wifi_tools/libnl-3.so.200.26.0 wifi_tools/libnl-3.so.200
cp wifi_tools/libnl-genl-3.so.200.26.0 wifi_tools/libnl-genl-3.so.200
cp wifi_tools/libnl-route-3.so.200.26.0 wifi_tools/libnl-route-3.so.200
cd wifi_tools
tar -cvf ../wifi_tools.tar .

willGenerateof wifi_tools.tar Copyto canAccessContents（If U /SD of /mnt/sd/）。

Note

in 200.26.0 with Tree Actual usr/lib/libnl-*.so.* File is ；If libnl，need Modify cp of File 。

6.2.2. STA：wpa_supplicant Configuration File¶

in can Contents wpa_supplicant.conf （for example /mnt/sd/wpa_supplicant.conf），ContentExample（SSID/Password ActualModify）：

network={
    ssid="111"
    psk="1234qwer"
    key_mgmt=WPA-PSK
}

6.2.3. STA：Board-Side Operation Steps¶

following wifi_tools.tar and wpa_supplicant.conf in /mnt/sd/， 8189fs.ko alreadyCopyto （If /mnt/sd/）。

# 1. Load WiFi Driver
insmod /mnt/sd/8189fs.ko

# 2. Extract wpa_supplicant、hostapd and 
mkdir -p /mnt/sd/wifi
cd /mnt/sd/wifi
tar -xvf /mnt/sd/wifi_tools.tar

# 3. Settings Pathand  wpa_supplicant（STA）
export LD_LIBRARY_PATH=/mnt/sd/wifi
/mnt/sd/wifi/wpa_supplicant -B -i wlan0 -c /mnt/sd/wpa_supplicant.conf

# 4. Wait seconds laterGet IP
sleep 5
udhcpc -i wlan0

# 5. View wlan0 Statusand IP
ifconfig wlan0

If udhcpc ，can Hotspot DHCP； HotspotNetwork Segmentis 192.168.43.x，can Configuration：

ifconfig wlan0 192.168.43.100 netmask 255.255.255.0 up
route add default gw 192.168.43.1

6.2.4. STA：Verification¶

ifconfig wlan0 inet addr and UP BROADCAST RUNNING。
ping 192.168.43.1 （orHotspotGateway）canVerification ；IfHotspot Network，can ping 8.8.8.8 Verification 。

6.2.5. AP Mode: hostapd¶

：andon ，alreadyfrom $W/usr/sbin/hostapd Insert wifi_tools.tar，Extractafter /mnt/sd/wifi/hostapd。
：and wpa_supplicant of libnl so，Settings LD_LIBRARY_PATH=/mnt/sd/wifi can。

in /mnt/sd/ under hostapd.conf （interface= andActual AP Ethernet Port ；SSID/PasswordPlease ActualModify）：

interface=wlan1
driver=nl80211
ssid=MyAP
hw_mode=g
channel=6
country_code=CN
ieee80211d=1

auth_algs=1
wmm_enabled=1
ignore_broadcast_ssid=0

wpa=2
wpa_passphrase=12345678
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
ieee80211w=0

6.2.6. AP Steps（ eth0 NAT Uplink）¶

：wlan0 is STA Hotspot（If 192.168.43.0/24），eth0 is or on （If 192.168.137.0/24）；in wlan1 on AP，under Terminal wlan1 → NAT → eth0 。If ip route in in wlan0 of default Routing， and“Default eth0 Uplink” ，can DefaultRouting（GatewayandInterfacewith ip route is ）。

udhcpd.conf （ in /mnt/sd/udhcpd.conf；Network Segmentcan Definition）：

start 192.168.1.100
end 192.168.1.200
interface wlan1
max_leases 20

option subnet 255.255.255.0
option router 192.168.1.1
option dns 8.8.8.8

ExecutefollowingCommandsConfigurationForwarding ：

export LD_LIBRARY_PATH=/mnt/sd/wifi

# Delete STA   default，  eth0 of default（Uplink ActualModify）
ip route del default via 192.168.43.1 dev wlan0

#   IPv4 Forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

# NAT：Ifalready in not Add（Uplink  eth0  ActualModify）
iptables -t nat -C POSTROUTING -o eth0 -j MASQUERADE 2>/dev/null || \
  iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

# Forwarding 
iptables -P FORWARD ACCEPT
iptables -F FORWARD
iptables -A FORWARD -i wlan1 -j ACCEPT
iptables -A FORWARD -o wlan1 -j ACCEPT

# hostapd Need toRun Contents
mkdir -p /var/run/hostapd

killall wpa_supplicant 2>/dev/null

# AP Local Host IP mustand udhcpd in option router  
ifconfig wlan1 192.168.1.1 netmask 255.255.255.0 up

/mnt/sd/wifi/hostapd -B /mnt/sd/hostapd.conf
udhcpd /mnt/sd/udhcpd.conf

udhcpd Description：IfSystem udhcpd need rootfs or dnsmasq；before can -f； need leases File（IfExecute touch /var/lib/misc/udhcpd.leases，PathwithLocal Host udhcpd –help is ）。

DHCP ：under DevicecanUse IP（192.168.1.x，Gateway 192.168.1.1， 255.255.255.0）。

If STA、 wlan0 of default Routing，can ip route del；192.168.43.1 and wlan0 Example。iptables and ip_forward needKernelEnable netfilter rootfs iptables。

：Execute killall hostapd；If udhcpd killall udhcpd（or PID ）。