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{{ApplicableFor | |||
|MPUs list=STM32MP13x, STM32MP15x, STM32MP25x | |||
|MPUs checklist=STM32MP13x, STM32MP15x, STM32MP25x | |||
}} | |||
<noinclude></noinclude> | |||
== Article purpose == | == Article purpose == | ||
This article explains how to configure ''Bluetooth'' <ref name="Bluetooth"> [[WLAN_and_Bluetooth_hardware_component|Bluetooth]] </ref> ''' when the peripheral ''(or peripheral associated to the framework)'' is assigned to the Linux<sup>®</sup> OS'''. | This article explains how to configure ''Bluetooth'' <ref name="Bluetooth"> [[WLAN_and_Bluetooth_hardware_component|Bluetooth]] </ref> ''' when the peripheral ''(or peripheral associated to the framework)'' is assigned to the Linux<sup>®</sup> OS'''. | ||
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The configuration is performed using the '''device tree mechanism''' <ref> [[Device tree]]</ref>. | The configuration is performed using the '''device tree mechanism''' <ref> [[Device tree]]</ref>. | ||
The Bluetooth companion chip chosen on our platform is a Cypress chip <ref>[http://wireless.murata.com/datasheet?/RFM/data/lbee5kl1dx.pdf MURATA CYW4343W datasheet]</ref> | The Bluetooth companion chip chosen on our platform is a Cypress chip | ||
* for {{MicroprocessorDevice | device=13}} and {{MicroprocessorDevice | device=15}} <ref>[http://wireless.murata.com/datasheet?/RFM/data/lbee5kl1dx.pdf MURATA CYW4343W datasheet]</ref> | |||
* for {{MicroprocessorDevice | device=25}} <ref>[https://www.murata.com/products/productdata/8815814344734/type1yn.pdf MURATA CYW43439 datasheet]</ref> | |||
== Bluetooth DT bindings documentation == | == Bluetooth DT bindings documentation == | ||
The ''Bluetooth''<ref name="WLAN and BT external peripheral"> [[WLAN_and_Bluetooth_hardware_component]]</ref> ''' tree bindings are composed of: | The ''Bluetooth''<ref name="WLAN and BT external peripheral"> [[WLAN_and_Bluetooth_hardware_component]]</ref> ''' tree bindings are composed of: | ||
* STM32 USART device tree bindings <ref>[[Serial TTY device tree configuration]]</ref> | * STM32 USART device tree bindings <ref>[[Serial TTY device tree configuration]]</ref> | ||
* The Cypress device, used as child node <ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/net/broadcom-bluetooth. | * The Cypress device, used as child node <ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml}}</ref> of the host USART device to which the slave device is attached. | ||
== Bluetooth DT configuration == | == Bluetooth DT configuration == | ||
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=== Bluetooth DT configuration (STM32 level) === | === Bluetooth DT configuration (STM32 level) === | ||
The USART peripheral node is located in | The USART peripheral node is located | ||
* This is a set of properties that may not vary for given STM32 device, such as: registers address, clock, reset... | * for {{MicroprocessorDevice | device=13}} in stm32mp131.dtsi <ref name="stm32mp131.dtsi">{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp131.dtsi | stm32mp131.dtsi}}</ref> | ||
* for {{MicroprocessorDevice | device=15}} in stm32mp151.dtsi <ref name="stm32mp151.dtsi">{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp151.dtsi | stm32mp151.dtsi}}</ref> | |||
* for {{MicroprocessorDevice | device=25}} in stm32mp251.dtsi <ref name="stm32mp251.dtsi">{{CodeSource | Linux kernel | arch/arm64/boot/dts/st/stm32mp251.dtsi | stm32mp251.dtsi}}</ref> | |||
This is | |||
This is a set of properties that may not vary for given STM32 device, such as: registers address, clock, reset... | |||
The USART DT configuration is explained in [[Serial TTY device tree configuration]] | The USART DT configuration is explained in [[Serial TTY device tree configuration]] | ||
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== How to configure Bluetooth using CubeMX == | == How to configure Bluetooth using CubeMX == | ||
The [[STM32CubeMX]] tool can be used to configure the STM32MPU device and get the corresponding [[Device_tree# | The [[STM32CubeMX]] tool can be used to configure the STM32MPU device and get the corresponding [[Device_tree#STM32_MPU|platform configuration device tree]] files.<br /> | ||
The STM32CubeMX may not support all the properties described in the above [[#Bluetooth DT bindings documentation|DT bindings documentation]] paragraph. If so, the tool inserts '''user sections''' in the generated device tree. These sections can then be edited to add some properties and they are preserved from one generation to another. Refer to [[STM32CubeMX]] user manual for further information. | The STM32CubeMX may not support all the properties described in the above [[#Bluetooth DT bindings documentation|DT bindings documentation]] paragraph. If so, the tool inserts '''user sections''' in the generated device tree. These sections can then be edited to add some properties and they are preserved from one generation to another. Refer to [[STM32CubeMX]] user manual for further information. | ||
Latest revision as of 15:00, 5 June 2024
1. Article purpose
This article explains how to configure Bluetooth [1] when the peripheral (or peripheral associated to the framework) is assigned to the Linux® OS.
The configuration is performed using the device tree mechanism [2].
The Bluetooth companion chip chosen on our platform is a Cypress chip
- for STM32MP13x lines
and STM32MP15x lines [3]
- for STM32MP25x lines [4]
2. Bluetooth DT bindings documentation
The Bluetooth[5] tree bindings are composed of:
- STM32 USART device tree bindings [6]
- The Cypress device, used as child node [7] of the host USART device to which the slave device is attached.
3. Bluetooth DT configuration
This hardware description is a combination of the STM32 microprocessor device tree files (.dtsi extension) and board device tree files (.dts extension). See the device tree for an explanation of the device tree file split.
3.1. Bluetooth DT configuration (STM32 level)
The USART peripheral node is located
- for STM32MP13x lines in stm32mp131.dtsi [8]
- for STM32MP15x lines in stm32mp151.dtsi [9]
- for STM32MP25x lines in stm32mp251.dtsi [10]
This is This is a set of properties that may not vary for given STM32 device, such as: registers address, clock, reset... The USART DT configuration is explained in Serial TTY device tree configuration
3.2. Bluetooth DT configuration (board level)
&usart2 { ... uart-has-rtscts; /* enable hardware flow control */ ... bluetooth { /* node of Bluetooth companion chip */ shutdown-gpios = <&gpioz 6 GPIO_ACTIVE_HIGH>; /* GPIO specifier, used to enable the BT module */ compatible = "brcm,bcm43438-bt"; max-speed = <3000000>; }; };
Specific properties for USART:
- uart-has-rtscts; bool flag to enable hardware flow control
4. How to configure Bluetooth using CubeMX
The STM32CubeMX tool can be used to configure the STM32MPU device and get the corresponding platform configuration device tree files.
The STM32CubeMX may not support all the properties described in the above DT bindings documentation paragraph. If so, the tool inserts user sections in the generated device tree. These sections can then be edited to add some properties and they are preserved from one generation to another. Refer to STM32CubeMX user manual for further information.
5. References