Replace the custom image with the above three paths
Note that the image format is PNG.
Update boot animation picture
$ sudo update-initramfs -u
$ reboot
Set boot self-start command
Write the required commands into the system /etc/rc.local
Set the wifi hotspot mode
iw list | grep AP
#Check if AP mode is supported
Device supports AP-side u-APSD.
* AP
* AP/VLAN
HE Iftypes: AP
HE Iftypes: AP
* wake up on EAP identity request
* AP/VLAN
* #{ managed } <= 1, #{ AP, P2P-client, P2P-GO } <= 1, #{ P2P-device } <= 1,
Driver supports full state transitions for AP/GO clients
Driver/device bandwidth changes during BSS lifetime (AP/GO mode)
* AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
* AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
# AP/VLAN It can indicate hardware support
#Create dependencies
sudo apt-get install util-linux hostapd dnsmasq iptables iproute2 haveged
# Create a virtual network interface card
sudo iw dev <wirelessname> interface add <virtualwlanname> type __ap
# < WirelessName > is the real wireless network interface card name, which can be viewed through ifconfig, #<virtualwlanname > is the virtual wireless network interface card name
#Such as command
sudo iw dev wlan0 interface add wlo2 type __ap
#Add physical address for virtual network interface card
sudo ip link set dev <virtualwlanname> address 22:33:44:55:66:00
# Feel free to fill in, if there is a conflict, change it, < virtualwlanname > is the virtual wireless # network interface card name
#For example, the command:
sudo ip link set dev wlo2 address 22:33:44:55:66:00
#View creation status
sudo iw dev <virtualwlanname> info
sudo iw dev wlo2 info
# The output is similar
Interface wlo2
ifindex 5
wdev 0x5
addr 04:e2:b9:17:18:72
type managed
wiphy 0
txpower 0.00 dBm
multicast TXQ:
qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytestx-packets
0 0 0 0 0 0 0 0 0
#Note: After restarting the computer, the virtual network interface card created here will be invalid
#Note: After restarting the computer, the virtual network interface card created here will be invalid
#Note: After restarting the computer, the virtual network interface card created here will be invalid
1. Download the installation tool create_ap
git clone https://github.com/oblique/create_ap
cd */create_ap
sudo make install
2. Use create_ap to create hotspots
sudo create_ap -c 11 <virtualwlanname> <wirelessname> <SSID> <password>
# < WirelessName > is the name of your wireless network interface card, < virtualwlanname > virtual network interface card name, < SSID > < password > is the hotspot wifi name and password created respectively
#For example
sudo create_ap -c 11 wlo2 wlan0 m3 88888888
3. If the created hotspot gets stuck
Open Hotspot Times with the following error:
#RTNETLINK answers: Device or resource busy
#ERROR: Maybe your WiFi adapter does not fully support virtual interfaces.
# Try again with --no-virt.
You can stop the hotspot created before, and then restart the hotspot as follows.
sudo create_ap --stop <virtualwlanname>
#<virtualwlanname> Virtual network interface card name
SSH login
The ubuntu-server version system has SSH installed by default. Open Windows cmd
ssh kickpi@<IP> //password kickpi
SSH root login
Root connection is not supported by default, root connection needs to be configured.
$ vim /etc/ssh/ssh_config
+ PermitRootLogin yes
$ vim /etc/ssh/sshd_config
+ PermitRootLogin yes
$ sudo /etc/init.d/ssh restart
Notes:
Make sure the board IP is normal.
Make sure that the IP of the board can be connected normally.
UBUNTU installs packages from the official website
Installing gcc as an example
wget http://ports.ubuntu.com/pool/main/g/gcc-9/gcc-9_9.3.0-10ubuntu2_arm64.debsudo dpkg -i *.deb The website is https://ubuntu.pkgs.org/20.04/ubuntu-main-arm64/gcc-9_9.3.0-10ubuntu2_arm64.deb.html can directly search for the desired dependent package name
f78e90f7748d198d11dbbd163bb33a9
PIN control
Pin calculation
( B ~ J ) A group is counted as 32 bits
If PB2 is 2 groups, foot 2
32 x ( 2 - 1) + 2 = 34
PH3 is 8 groups, foot 3.
32 x ( 8 - 1) + 3 = 227
Other pins can be calculated by analogy.
Sys gpio control
When there is a need to configure the extension pin as an input, the default software's GPIO-LED does not meet the requirement.
Release the GPIO and control it with/sys/class/gpio
Step one
Note the corresponding GPIO pins first,/sys/class/gpio/export can only import unregistered gpio.
For example, PH8, if you need other pins, just comment under the leds node. The following content is based on PH8 as an example
You can see that PH8 is not used, and the corresponding pin value is 232. See pin calculation for pin calculation.
Step four
Register and control PH8 through /sys/class/gpio/export
// Register
root@kickpi:~# echo 232 > /sys/class/gpio/export
// Check if it is generated
root@kickpi:~# ls /sys/class/gpio/
export gpio232 gpiochip0 gpiochip352 unexport
// Node content after registration
root@kickpi:~# ls /sys/class/gpio/gpio232
active_low device direction edge power subsystem uevent value
root@kickpi:~#
Control gpio through the content under the node, commonly used as follows
direction
in / out
echo in > /sys/class/gpio/gpio232/direction
echo out > /sys/class/gpio/gpio232/direction
value
0 / 1
cat /sys/class/gpio/gpio232/value // read
echo 1 > /sys/class/gpio/gpio232/value // Configure High
echo 0 > /sys/class/gpio/gpio232/value // Configure low
Sunxi gpio control
# cd /sys/kernel/debug/sunxi_pinctrl
Check the configuration of the pin.
# echo PH8 > sunxi_pin
# cat sunxi_pin_configure
Configure pin to gpio mode
# echo 'PH8 0' > function
Modify the pull-up properties of pin
# echo 'PH8 1' > pull
Check the modification status
# cat pull
# cat sunxi_pin_configure
Check pin level
# cat data
Attention:
When operating PL and subsequent pins, you need to switch the device of the pin, otherwise the operation fails.
# echo pio > /sys/kernel/debug/sunxi_pinctrl/dev_name
# cat /sys/kernel/debug/sunxi_pinctrl/dev_name
# echo r_pio > /sys/kernel/debug/sunxi_pinctrl/dev_name
# cat /sys/kernel/debug/sunxi_pinctrl/dev_name
