Restore UART/ttyAMA0 over GPIO, by Disable BT¶
Release the serial port, GPIO:
| GPIO | FUNC |
|---|---|
| 6 | TXD0(UART) |
| 8 | RXD0(UART) |
Modify Boot Configuration¶
Edit /boot/config.txt, append:
# Disable BT
dtoverlay=pi3-disable-bt
Reboot.
Check¶
$ ls -l /dev
...
lrwxrwxrwx 1 root root 7 Dec 21 21:10 serial0 -> ttyAMA0
lrwxrwxrwx 1 root root 5 Dec 21 21:10 serial1 -> ttyS0
...
Permit access for pi¶
$ sudo raspi-config
Select: Interfacing Options - Serial:
- Disable the login shell on the serial
- Enable the serial port hardware
- Reboot
| ref: | https://www.raspberrypi.org/forums/viewtopic.php?t=180254 |
|---|
Disable hciuart.service¶
$ sudo systemctl disable hciuart
Removed /etc/systemd/system/multi-user.target.wants/hciuart.service.