The whole baud thing is ridiculous.
We are decades past the concept of discrete bitrates but it is deeply embedded in the kernel for serial ports.
I thought this had been changed, allowing non-standard baud to be set but recent try to install bento-ttymidi, which uses
an overlay to request the standard 312500 Midi Baud rate for TX and RX pins 14 -15, returned an error. A function in the overlay
is trying to change the baud rate to a non standard (?) rate. This function is deprecated.
https://github.com/terioto/bento_ttymidi
https://github.com/terioto/bento_ttymidi/issues/1
bento_ttymidi is a lightweight MIDI bridge that connects ALSA MIDI with UART MIDI hardware. It supports both sending (TX via GPIO14) and receiving (RX via GPIO15) standard 5-pin DIN MIDI messages. Designed for Raspberry Pi systems.
Could there be some setting that needs to be set up in order for the DEVICE to be able to request a custom Baud rate?
https://github.com/terioto/bento_ttymid ... _ttymidi.c
After setting up the service, and making all the system configurations
included in the github, there is no much else I can do...
3. Check service status
systemctl status bento_ttymidi.service
Raspberry Pi UART Configuration (config.txt)
To enable UART MIDI on Raspberry Pi GPIO14 (TX), edit the config.txt:
sudo nano /boot/config.txt
Add or ensure the following lines are present:
enable_uart=1
dtoverlay=disable-bt
dtoverlay=midi-uart0
After editing, reboot your system:
sudo reboot
You should now see /dev/serial0 → usually linked to /dev/ttyAMA0
License
Based on ttymidi by Jonathan Lissajoux (https://github.com/lathoub/ttymidi), licensed under the MIT License. The original repository is no longer available, but various forks and archives remain accessible.
Contact
Website: https://www.terioto.com
Email: info@terioto.com
We are decades past the concept of discrete bitrates but it is deeply embedded in the kernel for serial ports.
I thought this had been changed, allowing non-standard baud to be set but recent try to install bento-ttymidi, which uses
an overlay to request the standard 312500 Midi Baud rate for TX and RX pins 14 -15, returned an error. A function in the overlay
is trying to change the baud rate to a non standard (?) rate. This function is deprecated.
https://github.com/terioto/bento_ttymidi
https://github.com/terioto/bento_ttymidi/issues/1
bento_ttymidi is a lightweight MIDI bridge that connects ALSA MIDI with UART MIDI hardware. It supports both sending (TX via GPIO14) and receiving (RX via GPIO15) standard 5-pin DIN MIDI messages. Designed for Raspberry Pi systems.
Could there be some setting that needs to be set up in order for the DEVICE to be able to request a custom Baud rate?
https://github.com/terioto/bento_ttymid ... _ttymidi.c
Code:
void open_serial() { struct termios tty; serial_fd = open(DEVICE, O_RDWR | O_NOCTTY); if (serial_fd < 0) { perror("[ERROR] open serial device"); exit(1); } if (debug) printf("[INFO] Opened serial device: %s\n", DEVICE); memset(&tty, 0, sizeof tty); if (tcgetattr(serial_fd, &tty) != 0) { perror("[ERROR] tcgetattr"); exit(1); } cfmakeraw(&tty); cfsetspeed(&tty, B38400); tty.c_cflag |= (CLOCAL | CREAD); tty.c_cflag &= ~CRTSCTS; if (tcsetattr(serial_fd, TCSANOW, &tty) != 0) { perror("[ERROR] tcsetattr"); exit(1); } set_custom_baudrate(serial_fd, BAUDRATE);After setting up the service, and making all the system configurations
included in the github, there is no much else I can do...
3. Check service status
systemctl status bento_ttymidi.service
Raspberry Pi UART Configuration (config.txt)
To enable UART MIDI on Raspberry Pi GPIO14 (TX), edit the config.txt:
sudo nano /boot/config.txt
Add or ensure the following lines are present:
enable_uart=1
dtoverlay=disable-bt
dtoverlay=midi-uart0
After editing, reboot your system:
sudo reboot
You should now see /dev/serial0 → usually linked to /dev/ttyAMA0
License
Based on ttymidi by Jonathan Lissajoux (https://github.com/lathoub/ttymidi), licensed under the MIT License. The original repository is no longer available, but various forks and archives remain accessible.
Contact
Website: https://www.terioto.com
Email: info@terioto.com
Statistics: Posted by Zool64Pi — Wed Jul 02, 2025 3:09 pm