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Libromi provides common abstractions and functions for ROMI applications.
The serial camera is intended to be used with a Raspberry Pi 4 (the host) and a Raspberri Pi Zero W (the camera).
In order to work, the serial ports of both Raspberry Pi's have to be set up correctly.
- Start raspi-config ($ sudo raspi-config)
- Select "Interface option", then "P6 Serial port"
- The following question will be asked: "Would you like a shell login to be accessible over serial?". Answer
- Then this question will be asked: "Would you like the serial port hardware to be enabled?". Answer
- Reboot.
- After rebooting, edit /boot/config.txt
- Replace "dtoverlay=pi3-miniuart-bt" with "dtoverlay=pi3-disable-bt" If you can't find "dtoverlay=pi3-miniuart-bt", then insert "dtoverlay=pi3-disable-bt" at the end of the file.
- Reboot again.
If also is well, the following symbolic links should be set up (TBC):
lrwxrwxrwx 1 root root 7 Apr 4 16:46 /dev/serial0 -> ttyAMA0 lrwxrwxrwx 1 root root 5 Apr 4 16:46 /dev/serial1 -> ttyS0
Make sure the kernel version is more recent than 4.8:
$ uname -a Linux hostname 5.10.17-v7l+ #1403 SMP Mon Feb 22 11:33:35 GMT 2021 armv7l GNU/Linux
Check that the GPIO devices are there. The RPi4 has two gpio chips, the Pi Zero W only one:
$ ls -al /dev/gpiochip* crw-rw---- 1 root gpio 254, 0 Apr 2 17:59 /dev/gpiochip0 crw-rw---- 1 root gpio 254, 1 Apr 2 17:59 /dev/gpiochip1
Install the gpiod package:
$ sudo apt install gpiod libgpiod-dev
Check whether the gpio tools work:
$ sudo gpiodetect $ sudo gpioinfo gpiochip0