BM83 Audio Transceiver v1.0 Release Note

VERSION 1.0

The following are attributes of the Audio Transceiver (AT) firmware, which supports A2DP source. The BM83SM1-00TA module is programmed with this firmware and defaulted to Host Mode. Navigate at the directory structure below for software.

IS2083_Turnkey_1.1.0\Software\IS2083 Image\AT v1.0

Documents and Utility Tools

1. New Features and Enhancements

Support both Tx and Rx Mode. See below major supported features for both modes.

Dual Link Supported

• Tx Mode: Two A2DP connections.
• Rx Mode: Two A2DP + 1 HF connections.

Support TX Mode and RX Mode mode switch via GPIO level switch or UART Commands.

Tx Mode Features:

• Nearby Bluetooth audio devices discovery and connections:
  • Embedded Mode: Auto connection operation based on RSSI value.
  • Host Mode: Filter discovered devices based on UART command asserted conditions.
• Support both I2S IN or AUX IN audio input source. Input source is controlled through GPIO or UART Commands.
• Auto re-connect with existing paired devices after power on.
• Audio streaming toggle operation under dual link:
  • Embedded mode: One key operation.
  • Host Mode: UART command initiated by Host MCU.
• Support SBC Encoder with 48 KHz or 44.1 KHz sampling rate. This initialization setting can be configured via Configuration Tool or UART command.
• Dual streaming supported: Streaming to two A2DP Sinks simultaneously. It can be enabled through Configuration tool.
• Specific tab in Configuration Tool for Tx mode configuration. See Configuration tool in detail.

Rx Mode Features:

• Inherited from BM83 MSPK2 v1.2:
  • A2DP, AVRCP and HF device role.
  • Charging, LED and button control behavior.
• Bluetooth 5.0 compliant and end product listing.

2. Issues Fixed

N/A. First release.

3. Errata

• Dual Streaming issues and limitation:
  • While one Bluetooth audio device is connected and playback streaming, audio streaming may be stuttering if the another Bluetooth audio device link back to BM83 AT device.
  • While one Bluetooth TWS headset is connected and playback streaming, audio break may be observed if BM83 AT is trying to connect to another speaker.
  • Under dual streaming condition, no audio or audio breaks may be observed while 1 connected Bluetooth audio device goes out of range.
• BLE + TX Mode Streaming Co-Existence Limitation:
  • When LE is connected using Android MBA app, a short period of audio break is observed in connected Bluetooth audio device due to RF Bandwidth limitation.
• IOP issues with HUAWEI FreeBids3 TWS Headset:
  • No audio out while earbuds are taken out from box. Earbud link back to BM83 AT but link is lost suddenly.
• Repeated plug in and out, Aux-in cable would cause noise at the receiver.
• Audio switching between receivers using toggle play back command causes noise at the receiver.

Document Revision History

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