67 lines
2.1 KiB
Markdown
67 lines
2.1 KiB
Markdown
# nRF5340 Bluetooth Controller with Support for LE ISO Timesync
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This fork of the Zephyr HCI UART example adds a custom HCI Command to allow for timesync between the Bluetooth Host
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and the Bluetooth Controller. When the HCI LE Read ISO Clock command is received, the Controller toggles a GPIO and
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returns its current Bluetooth LE ISO Clock in the Command Complete Event.
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It has been tested on the nRF5340 Audio DK, but it should work with any nRF5340 dev kit.
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## Requirements
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- nRF Connect SDK v2.8 or newer
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## HCI LE Read ISO Clock Command
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- OGF: 0x3f, OCF: 0x200
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- Parameters: Flags (1 Octet) unused
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- Response: HCI Command Complete Event with status and 4 bytes timestamp in microseconds
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## nRF5340 Development Kit
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### HCI over USB CDC
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```sh
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west build -b nrf5340dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf
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```
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_HCI over UART and timesync not tested._
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## nRF5340 Audio DK
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### HCI over USB CDC
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```sh
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west build --pristine -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf
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```
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### HCI over UART 0 connected to Virtual UART in J-Link Probe
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```sh
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west build --pristine -b nrf5340_audio_dk_nrf5340_cpuapp
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```
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### HCI over UART 1 connected to Virtual UART in J-Link Probe as well as Arduino Headers
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Release build:
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```sh
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west build --pristine -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=uart1.overlay
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```
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Debug build:
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```sh
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west build --pristine -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=uart1.overlay -DOVERLAY_CONFIG=debug.conf
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```
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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.
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### UART 1 + Time Sync Pinout
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Signal direction as seen from the nRF5340.
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| PIN | Arduino | nrf | Direction |
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|----------|---------|-------|-----------|
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| TX | D0 | P1.09 | out |
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| RX | D1 | P1.08 | in |
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| RTS | D7 | P1.11 | out |
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| CTS | D8 | P1.10 | in |
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| Timesync | D10 | P1.01 | out |
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