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orangepi-xunlong
GitHub Repository: orangepi-xunlong/orangepi-build
 Path: blob/next/external/cache/sources/rtk_hciattach/Readme.txt
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The document describes how to support Realtek UART Bluetooth driver in Linux system.

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The supported kernel version is 2.6.32 - 4.15

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The default serial protocol of Realtek Bluetooth chip is Three-wire (H5) protocol

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with flow control on, parity even and internel 32k clock.

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The default baud rate is 115200.

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To support Three-wire (H5) protocol, you need to install Realtek hci_uart driver

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and rtk_hciattach tool.

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1. make sure your UART setting is correct.

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   host tx  - controller rx

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   host rx  - controller tx

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   host rts - controller cts

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   host cts - ground

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        NC  - controller rts

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2. Install Bluetooth kernel driver and rtk_hciattach tool

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   $ sudo make install

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   If you encounter an error like "depmod: ERROR: Bad version passed /lib/modules/...",

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   please change the lines "depmod -a $(MDL_DIR)" to "depmod -a $(shell uname -r)"

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3. Initialize Realtek Bluetooth chip by rtk_hciattach

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   $ sudo rtk_hciattach -n -s 115200 ttyUSB0 rtk_h5

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   for H4 protocol chip

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   $ sudo rtk_hciattach -n -s 115200 ttyUSB0 rtk_h4

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Tips: ttyUSB0 is serial port name in your system, you should change it

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      according to hardware such as ttyS0.

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4. Uninstall

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   $ sudo make uninstall

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If you want to change the parameter such as baud rate and pcm settings, you

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should modify rtl8xxx_config file.

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