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Matthias Ringwald
2024-12-03 12:20:59 +01:00
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# nRF5340 Bluetooth Controller with Support for LE ISO Timesync
This fork of the Zephyr HCI UART example adds a custom HCI Command to allow for timesync between the Bluetooth Host and the Bluetooth Controller. When the HCI LE Read ISO Clock command is received, the Controller toggles a GPIO and returns its current Bluetooth LE ISO Clock in the Command Complete Event.
This fork of the Zephyr HCI UART example adds a custom HCI Command to allow for timesync between the Bluetooth Host
and the Bluetooth Controller. When the HCI LE Read ISO Clock command is received, the Controller toggles a GPIO and
returns its current Bluetooth LE ISO Clock in the Command Complete Event.
It has been tested on the nRF5340 Audio DK, but it should work with any nRF5340 dev kit.
## Requirements
- nRF Connect SDK v2.8 or newer
## HCI LE Read ISO Clock Command
- OGF: 0x3f, OCF: 0x200
- Parameters: Flags (1 Octet) unused
@@ -25,25 +30,25 @@ _HCI over UART and timesync not tested._
### HCI over USB CDC
```sh
west build -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf
west build --pristine -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf
```
### HCI over UART 0 connected to Virtual UART in J-Link Probe
```sh
west build -b nrf5340_audio_dk_nrf5340_cpuapp
west build --pristine -b nrf5340_audio_dk_nrf5340_cpuapp
```
### HCI over UART 1 connected to Virtual UART in J-Link Probe as well as Arduino Headers
Release build:
```sh
west build -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=uart1.overlay
west build --pristine -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=uart1.overlay
```
Debug build:
```sh
west build -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=uart1.overlay -DOVERLAY_CONFIG=debug.conf
west build --pristine -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=uart1.overlay -DOVERLAY_CONFIG=debug.conf
```
To use UART 1 via Arduino headers, the virtual UART of the J-Link probe needs to be disabled, e.g. with the JLink Configuration Tool.