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readme: sort by dev kit, document intention and timesync pin

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Matthias Ringwald
2024-06-25 14:19:38 +02:00
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# build for USB CDC
# 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.
It has been tested on the nRF5340 Audio DK, but it should work with any nRF5340 dev kit.
## HCI LE Read ISO Clock Command
- OGF: 0x3f, OCF: 0x200
- Parameters: Flags (1 Octet) unused
- Response: HCI Command Complete Event with status and 4 bytes timestamp in microseconds
## nRF5340 Development Kit
### HCI over USB CDC
```sh
west build -b nrf5340dk_nrf5340_cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf
```
_HCI over UART and timesync not tested._
## nRF5340 Audio DK
### HCI over UART 0 connected to Virtual UART in J-Link Probe
# build for build in serial adapter of the nrf5340_audio_dk a.k. uart0
```sh
west build -b nrf5340_audio_dk_nrf5340_cpuapp
```
# build for uart1 a.k. arduino_serial
### 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
```
# build for debug and uart1
Debug build:
```sh
west build -b nrf5340_audio_dk_nrf5340_cpuapp -- -DEXTRA_DTC_OVERLAY_FILE=uart1.overlay -DOVERLAY_CONFIG=debug.conf
```
# pinout for nrf5340_audio_dk for uart1
| PIN | Arduino | nrf |
|:---:|:-------:|:-----:|
| TX | D0 | P1.09 |
| RX | D1 | P1.08 |
| RTS | D7 | P1.11 |
| CTS | D8 | P1.10 |
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.
### UART 1 + Time Sync Pinout
Signal direction as seen from the nRF5340.
| PIN | Arduino | nrf | Direction |
|----------|---------|-------|-----------|
| TX | D0 | P1.09 | out |
| RX | D1 | P1.08 | in |
| RTS | D7 | P1.11 | out |
| CTS | D8 | P1.10 | in |
| Timesync | D10 | P1.01 | out |