85a0c7cd62
a2dp: introduce context, move common code to avdtp.c a2dp: wrap source functionality a2dp: enable packet handler a2dp: draft implemetation source open stream avrcp: add streaming connection opened/released events avdtp source: introduce timer for storing audio data at const fr., encode into sbc, and prepare for sending wav_util: fix return of wav_reader_read_int16 sbc: rename sbc to msbc test sbc: improve usage output sbc: fix makefile sbc: remove hardcoded bitrate avdtp: add encode/decode sine example without using ring buffer avdtp: move ring buffer to stream endpoint avdtp: add encode/decode test with ring buffer sbc: use btstack_sbc_encoder_num_audio_frames - 1 audio frame contains 1 audio sample for mono and 2 for stereo sbc: use btstack_sbc_encoder_num_audio_frames - 1 audio frame contains 1 audio sample for mono and 2 for stereo sbc: revert sample counting avdtp: source sending correct audio first time avdtp: shorter timer for audio generation gets correct stream avdtp: set state to AVDTP_STREAM_ENDPOINT_STREAMING_W2_SEND when more data is ready avdtp: introduce transport category as mandatory avdtp: introduce transport category as mandatory
Note: Major API Changes. For older projects, you may use the v0.9 branch. Please see Migration notes
Welcome to BTstack
BTstack is BlueKitchen's implementation of the official Bluetooth stack. It is well suited for small, resource-constraint devices such as 8 or 16 bit embedded systems as it is highly configurable and comes with an ultra small memory footprint. A minimal configuration for an SPP server on a MSP430 can run in 32 kB FLASH and only 4 kB of RAM.
Targeting a variety of platforms is as simple as providing the necessary UART, CPU, and CLOCK implementations. BTstack is currently capable of connecting to Bluetooth-modules via: (H2) HCI USB, (H4) HCI UART + TI's eHCILL, and (H5) HCI Three-Wire UART.
On smaller embedded systems, a minimal run loop implementation allows to use BTstack without a Real Time OS (RTOS). If a RTOS is already provided, BTstack can be integrated and run as a single thread.
On larger systems, BTstack provides a daemon that connects to a Bluetooth module. Multiple applications can communicate with this daemon over different inter-process communication methods.
BTstack supports the Central and the Peripheral Role of Bluetooth 4.2 Low Energy specification. It can be configured to run as either single-mode stack or a dual-mode stack.
BTstack is free for non-commercial use. However, for commercial use, tell us a bit about your project to get a quote.
Discussion and Community Support: BTstack Google Group
Supported Protocols and Profiles
Protocols: L2CAP, RFCOMM, SDP, BNEP, ATT, SM (incl. LE Secure Connections).
Profiles GAP, IOP, HFP, HSP, SPP, PAN, GATT.
Coming next A2DP, AVRCP, HID, HOGP, BLE Mesh, and more.
It has been qualified with the the Bluetooth SIG for GAP, IOP, HFP, HSP, SPP, PAN profiles and GATT, SM of the Bluetooth 4.2 LE Central and Peripheral roles (QD ID 25340). For information on MFi/iAP2 support, please contact us.
Evaluation Platforms
Embedded Platforms:
| Status | Platform |
|---|---|
 |
EZ430-RF256x Bluetooth Evaluation Tool for MSP430 |
 |
MSP430F5438 Experimenter Board for MSP430 with Bluetooth CC2564 Module Evaluation Board |
 |
MSP-EXP430F5529LP LaunchPad with Bluetooth CC2564 Module Evaluation Board and EM Adapter BoosterPack with additional 32768Hz quartz oscillator |
 |
STM32 Nucleo development board NUCLEO-F103RB with Bluetooth CC2564 Module Evaluation Board and EM Adapter BoosterPack with additional 32768Hz quartz oscillator |
 |
Microchip's PIC32 Bluetooth Audio Development Kit |
 |
RedBear Duo with Broadcom BCM43438 A1 |
Other Platforms:
| Status | Platform |
|---|---|
 |
posix: Unix-based system connected to Bluetooth module via serial port |
 |
libusb: Unix-based system with dedicated USB Bluetooth dongle |
| .. | windows-h4: Win32-based system connected to Bluetooth module via serial port |
| .. | windows-winusb: Win32-based system with dedicated USB Bluetooth dongle |
 |
daemon: TCP and Unix domain named socket client-server architecture supporting multiple clients |
 |
java: Java wrapper for daemon |
 |
iOS: daemon for iOS jailbreak devices, C client-server API |
 |
mtk: daemon for rooted Android devices, based on Mediatek MT65xx processor, Java and C client-server API |
|
wiced: Broadcom platforms that support the WICED SDK |
Supported Chipsets
| Chipset | Type | HCI Transport | SCO over HCI (2) | BTstack folder | Comment |
|---|---|---|---|---|---|
| Broadcom UART | Dual mode | H4, H5 | Probably | bcm | Max UART baudrate 2 mbps |
| Broadcom USB Dongles | Dual mode | USB | Yes | bcm | |
| CSR UART | Dual mode | H4, H5 | No (didn't work) | csr | |
| CSR USB Dongles | Dual mode | USB | Yes | csr | |
| EM 9301 | LE | SPI | n.a. | em9301 | Custom HCI SPI implementation |
| Nordic nRF | LE | H4 | n.a. | Requires custom HCI firmware | |
| STM STLC2500D | Classic | H4 | No (didn't try) | stlc2500d | Custom deep sleep management not supported |
| Toshiba TC35661 | Dual mode | H4 | No (didn't try) | tc3566 | HCI version not tested. |
| TI CC256x, WL183x | Dual mode | H4, H5, eHCILL | Yes | cc256x | Also WL185x, WL187x, and WL189x |
More infos on supported chipsets
Source Tree Overview
| Path | Description |
|---|---|
| chipset | Support for individual Bluetooth chipsets |
| doc | Sources for BTstack documentation |
| example | Example applications available for all ports |
| platform | Support for special OSs and/or MCU architectures |
| port | Complete port for a MCU + Chipset combinations |
| src | Bluetooth stack implementation |
| test | Unit and PTS tests |
| tool | Helper tools for BTstack |