The BR21 integrates the following major subsystems on a single die:
The BR21 won't win any audiophile awards, but for $3–$5 per module, it is arguably the best bang-for-buck solution for turning any passive speaker into a smart, portable Bluetooth boombox. Jieli Br21 Driver
For the more technically inclined, the BR21 chip is part of a family that supports single-wire serial port upgrades. The DP and DM (Data Plus/Minus) pins on some Jieli tools are repurposed for JTAG communication to flash or debug the on-chip firmware. Finding the Driver The BR21 integrates the following major subsystems on
Typical development steps: