luckfox-eng29 8f34c2760d project:build.sh: Added fastboot support; custom modifications to U-Boot and kernel implemented using patches.

project:cfg:BoardConfig_IPC: Added fastboot BoardConfig file and firmware post-scripts, distinguishing between
the BoardConfigs for Luckfox Pico Pro and Luckfox Pico Max. project:app: Added fastboot_client and rk_smart_door
for quick boot applications; updated rkipc app to adapt to the latest media library. media:samples: Added more
usage examples. media:rockit: Fixed bugs; removed support for retrieving data frames from VPSS. media:isp:
Updated rkaiq library and related tools to support connection to RKISP_Tuner. sysdrv:Makefile: Added support for
compiling drv_ko on Luckfox Pico Ultra W using Ubuntu; added support for custom root filesystem.
sysdrv:tools:board: Updated Buildroot optional mirror sources, updated some software versions, and stored device
tree files and configuration files that undergo multiple modifications for U-Boot and kernel separately.
sysdrv:source:mcu: Used RISC-V MCU SDK with RT-Thread system, mainly for initializing camera AE during quick
boot. sysdrv:source:uboot: Added support for fastboot; added high baud rate DDR bin for serial firmware upgrades.
sysdrv:source:kernel: Upgraded to version 5.10.160; increased NPU frequency for RV1106G3; added support for
fastboot.

Signed-off-by: luckfox-eng29 <eng29@luckfox.com>

2024-10-14 09:47:04 +08:00

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RT-Thread A2DP-SINK demo

Demo of A2DP audio sink role

This is the demo of API implementing Advanced Audio Distribution Profile to receive an audio stream.

This example involves the use of Bluetooth legacy profile A2DP for audio stream reception, AVRCP for media information notifications, and I2S for audio stream output interface.

Applications such as bluetooth speakers can take advantage of this example as a reference of basic functionalities.

How to use this example

Hardware Required

To play the sound, there is a need of loudspeaker and possibly an external I2S codec. Otherwise the example will only show a count of audio data packets received silently. Internal DAC can be selected and in this case external I2S codec may not be needed.

Configure the project

scons --menuconfig

Configure the protocol stack and open the a2dp function.

RT-Thread Components  --->
	Bluetooth  --->
        [*] 	Bluedroid Enable  --->
            [*]   Classic Bluetooth (NEW)
            [*]     A2DP
            (2048)    A2DP sink (audio stream decoding) task stack size (NEW)
            (2048)    A2DP source (audio stream encoding) task stack size (NEW)

Open a2dp sink example.

RT-Thread Components  --->
    Bluetooth  --->
        examples bluetooth  --->
            Example 'A2DP SINK' Config  --->
                [*] Demo of a2dp audio sink role

Example Output

After the program is started, the example starts inquiry scan and page scan, awaiting being discovered and connected. Other bluetooth devices such as smart phones can discover a device named "RK_SPEAKER". A smartphone or another RT-Thread example of A2DP source can be used to connect to the local device.

Once A2DP connection is set up, there will be a notification message with the remote device's bluetooth MAC address like the following:

I (106427) BT_AV: A2DP connection state: Connected, [64:a2:f9:69:57:a4]

If a smartphone is used to connect to local device, starting to play music with an APP will result in the transmission of audio stream. The transmitting of audio stream will be visible in the application log including a count of audio data packets, like this:

I (120627) BT_AV: A2DP audio state: Started
I (122697) BT_AV: Audio packet count 100
I (124697) BT_AV: Audio packet count 200
I (126697) BT_AV: Audio packet count 300
I (128697) BT_AV: Audio packet count 400

Also, the sound will be heard if a loudspeaker is connected and possible external I2S codec is correctly configured. For A2DP source example, the sound is noise as the audio source generates the samples with a random sequence.

Troubleshooting

For current stage, the supported audio codec in A2DP is SBC. SBC data stream is transmitted to A2DP sink and then decoded into PCM samples as output. The PCM data format is normally of 44.1kHz sampling rate, two-channel 16-bit sample stream. Other decoder configurations in A2DP sink is supported but need additional modifications of protocol stack settings.
As a usage limitation, A2DP sink can support at most one connection with remote A2DP source devices. Also, A2DP sink cannot be used together with A2DP source at the same time, but can be used with other profiles such as SPP and HFP.

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