btstack/port/posix-h4-bcm

BTstack Port for POSIX Systems with modern Infineon (CYW) H4 Bluetooth Controller

Configuration

Newer Infineon Airoc (tm) Controllers like the CYW5557x series accept PatchRAM upload only in a so-called 'auto-baud mode' which is entered by asserting CTS (low) and starting/resetting the controller via BT_REG_EN. This port currently only supports the CYW5557x Controllers and slowly uploads the firmware at 115200.

Compilation

BTstack's posix-h4-bcm port does not have additional dependencies. You can directly run cmake and then your default build system. E.g. with Ninja:

mkdir build
cd build
cmake -G Ninja ..
ninja

Running the examples

On start, BTstack opens the serial port, which asserts CTS, and requests you to reset the Controller with a countdown.

$ ./gatt_counter
Packet Log: /tmp/hci_dump.pklg
Phase 1: Download firmware
Please reset Bluetooth Controller, e.g. via RESET button. Firmware download starts in:
3
2
1
Firmware download started
Phase 2: Main app
...
BTstack up and running at 55:56:0A:0A:76:93

ToDo

• increase baud rate for firmware upload
• query controller to select correct PatchRAM file