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The document describes how to support Realtek UART Bluetooth driver in Linux system.
The supported kernel version is 2.6.32 - 4.15
The default serial protocol of Realtek Bluetooth chip is Three-wire (H5) protocol
with flow control on, parity even and internel 32k clock.
The default baud rate is 115200.
To support Three-wire (H5) protocol, you need to install Realtek hci_uart driver
and rtk_hciattach tool.
1. make sure your UART setting is correct.
host tx - controller rx
host rx - controller tx
host rts - controller cts
host cts - ground
NC - controller rts
2. Install Bluetooth kernel driver and rtk_hciattach tool
$ sudo make install
If you encounter an error like "depmod: ERROR: Bad version passed /lib/modules/...",
please change the lines "depmod -a $(MDL_DIR)" to "depmod -a $(shell uname -r)"
3. Initialize Realtek Bluetooth chip by rtk_hciattach
$ sudo rtk_hciattach -n -s 115200 ttyUSB0 rtk_h5
for H4 protocol chip
$ sudo rtk_hciattach -n -s 115200 ttyUSB0 rtk_h4
Tips: ttyUSB0 is serial port name in your system, you should change it
according to hardware such as ttyS0.
4. Uninstall
$ sudo make uninstall
If you want to change the parameter such as baud rate and pcm settings, you
should modify rtl8xxx_config file.
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