Lite

Install

Setup Wifi

(install raspiOS lite)

sudo apt update && sudo apt full-upgrade
sudo apt purge rpicam-apps-lite libpisp1
sudo dpkg-reconfigure tzdata
sudo dpkg-reconfigure locales
sync
reboot

sudo systemctl stop avahi-daemon
sudo systemctl disable avahi-daemon

sudo rfkill list
sudo rfkill unblock 1
sudo apt install ifupdown resolvconf wpa_supplicant
ifconfig

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf 
---
country=FR
update_config=1
ctrl_interface=/var/run/wpa_supplicant
---

wpa_passphrase MY_SSID MY_PSK | sudo tee -a /etc/wpa_supplicant/wpa_supplicant.conf

sudo mv /etc/network/interfaces /etc/network/interfaces.bak
sudo nano /etc/network/interfaces
---
auto lo
iface lo inet loopback

allow-hotplug wlan0
iface wlan0 inet static
    address 192.168.1.135/24
    netmask 255.255.255.0
    broadcast 192.168.1.255
    gateway 192.168.1.254
    dns-nameservers 8.8.8.8 8.8.4.4
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
---

sudo systemctl stop NetworkManager
sudo systemctl disable NetworkManager
sync
reboot

sudo apt purge network-manager netplan.io cloud-init
sudo apt autopurge

sudo cp /boot/firmware/config.txt /boot/firmware/config.txt.bak
sudo nano /boot/firmware/config.txt
---
auto_initramfs=1
dtoverlay=vc4-kms-v3d
max_framebuffers=2
disable_fw_kms_setup=1
arm_64bit=1
disable_overscan=1

#user config
dtoverlay=disable-bt
---

Enable SSH

sudo raspi-config
(enable ssh)

ssh hotnuma@192.168.1.135

Install custom programs

sudo apt install git meson
git config --global user.name "user_name"
git config --global user.email user_email@gmail.com

mkdir ~/DevFiles && cd ~/DevFiles

git clone https://github.com/hotnuma/libtinyc.git
pushd libtinyc
./install.sh
popd

git clone https://github.com/hotnuma/systools.git
pushd systools
./install.sh
popd

git clone https://github.com/hotnuma/sysload.git
pushd sysload
./install.sh
popd

sudo psmem.py
---
 Private  +   Shared  =  RAM used   Program

  5.9 MiB +   4.7 MiB =  10.5 MiB   systemd (2)
  3.2 MiB +   4.3 MiB =   7.5 MiB   sshd-session (2)
  4.2 MiB +   2.1 MiB =   6.3 MiB   wpa_supplicant (2)
  3.3 MiB + 838.5 KiB =   4.1 MiB   systemd-udevd
  3.7 MiB + 172.5 KiB =   3.9 MiB   bash
  2.1 MiB + 775.5 KiB =   2.9 MiB   systemd-journald
852.0 KiB +   2.0 MiB =   2.8 MiB   sudo (2)
  1.6 MiB +   1.1 MiB =   2.7 MiB   sshd
  1.4 MiB + 873.5 KiB =   2.3 MiB   systemd-logind
  1.2 MiB + 772.5 KiB =   2.0 MiB   systemd-timesyncd
  1.8 MiB + 200.5 KiB =   1.9 MiB   (sd-pam)
  1.1 MiB + 449.5 KiB =   1.5 MiB   dbus-daemon
400.0 KiB + 895.0 KiB =   1.3 MiB   avahi-daemon (2)
620.0 KiB + 426.0 KiB =   1.0 MiB   agetty (2)
288.0 KiB + 207.5 KiB = 495.5 KiB   cron
---------------------------------
                           21 prc
                         51.2 MiB
=================================
---

Passwordless login

https://www.tecmint.com/ssh-passwordless-login-using-ssh-keygen-in-5-easy-steps/

ssh-keygen -t rsa
(press enter 3 times)
ssh-copy-id hotnuma@192.168.1.135
ssh hotnuma@192.168.1.135

Enable i2c

sudo apt install i2c-tools
sudo raspi-config
(enable arm i2c)

Install IR receiver

sudo nano /boot/firmware/config.txt
---
dtoverlay=gpio-ir,gpio_pin=17
---
reboot

sudo apt install lirc liblirc-dev ir-keytable

select a protocol : sudo ir-keytable -p nec

read key codes : ir-keytable -t

create a custom keymap :

sudo nano /etc/rc_keymaps/custom.toml
---
[[protocols]]
name = "custom"
protocol = "nec"
variant = "nec"
[protocols.scancodes]
0x52 = "KEY_OK"
---

test the keymap :

sudo ir-keytable -c -w /etc/rc_keymaps/custom.toml
ir-keytable -t

sudo cp /etc/rc_maps.cfg /etc/rc_maps.cfg.bak
sudo nano /etc/rc_maps.cfg
---
* * custom.toml
---

sudo ir-keytable -a /etc/rc_maps.cfg
irw

reboot

Execute command from C code

https://www.lirc.org/api-docs/html/group__lirc__client.html

nano ~/.lircrc
---
begin
 prog = radio
 button = KEY_OK
 config = radio sabrosita
end
---

remote.c

cbuild test remote.c lirc
./test