Support time sync on nRF52833 DK

CMakeLists.txt

@@ -10,9 +10,9 @@ set(SRCS
 )
 
 if (CONFIG_SOC_COMPATIBLE_NRF52X)
-    MESSAGE(FATAL_ERROR "nRF52 SoC series not supported yet")
+    target_sources(app PRIVATE src/controller_time_nrf52.c)
 elseif (CONFIG_SOC_COMPATIBLE_NRF5340_CPUAPP)
-    target_sources(app PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src/audio_sync_timer_rtc.c)
+    target_sources(app PRIVATE src/audio_sync_timer_rtc.c)
 elseif (CONFIG_SOC_SERIES_NRF54LX OR CONFIG_SOC_SERIES_NRF54HX)
     target_sources(app PRIVATE src/controller_time_nrf54.c)
 else()

README.md

@@ -15,6 +15,39 @@ It has been tested on the nRF5340 Audio DK, but it should work with any nRF5340
 - Response: HCI Command Complete Event with status and 4 bytes timestamp in microseconds
 
 
+
+## nRF58233 Development Kit
+
+The first  Virtual UART (UART1, ...) is Zephyr UART 0
+The second Virtual UART (UART2, ...) is Zephyr UART 1
+
+### Pinout
+
+Signal direction as seen from the nRF52833.
+
+| PIN      | Arduino | MCU   | Direction |
+|----------|---------|-------|-----------|
+|  TX      |    D0   | P0.05 |    out    |
+|  RX      |    D1   | P0.06 |    in     |
+| RTS      |    D7   | P0.07 |    out    |
+| CTS      |    D8   | P0.08 |    in     |
+| Time Sync|    D10  | P1.01 |    out    |
+
+### HCI over UART 0 connected to first Virtual UART in J-Link Probe
+
+Release build:
+```sh
+west build --pristine -b nrf52833dk/nrf52833
+```
+Debug build:
+```sh
+west build --pristine -b nrf52833dk/nrf52833 -- -DOVERLAY_CONFIG=debug.conf
+```
+
+To use UART 0 via Arduino headers, the virtual UART of the J-Link probe needs to be disabled, e.g. with the JLink Configuration Tool.
+
+
+
 ## nRF5340 Development Kit
 
 The first  Virtual UART (UART1, ...) is Zephyr UART 1
@@ -32,8 +65,6 @@ Signal direction as seen from the nRF5340.
 | CTS      |    D8   | P1.10 |    in     |
 | Time Sync|    D10  | P1.06 |    out    |
 
-
-
 ### HCI over USB CDC
 
 ```sh
@@ -104,6 +135,7 @@ west build --pristine -b nrf5340_audio_dk/nrf5340/cpuapp -- -DEXTRA_DTC_OVERLAY_
 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.
 
 
+
 ## nRF54L15
 
 ### HCI over UART 0 connected to second Virtual UART in J-Link Probe
@@ -133,7 +165,7 @@ Signal direction as seen from the nRF54L15.
 
 
 ## Maintainer Notes
-- nRF5340 use Controller configuration in `sybuild/ipc_radio/prj.conf`, while other, e.g. nRF54L15, use configuration in `prj.conf`. Please update both at the same time. 
+- nRF5340 use Controller configuration in `sybuild/ipc_radio/prj.conf`, while others, e.g. nRF54L15, use configuration from `prj.conf`. Please update both at the same time. 
 - We can detect nRF5340 SoC in CMake with `if(CONFIG_SOC STREQUAL "nrf5340")` after find_package zephyr.
 
  

boards/nrf52833dk_nrf52833.overlay

@@ -4,6 +4,17 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+/ {
+	host_interface {
+		compatible = "gpio-outputs";
+		status = "okay";
+		timesync: pin_0 {
+			gpios = <&gpio1 01 GPIO_ACTIVE_HIGH>;
+			label = "Controller to host timesync pin";
+		};
+	};
+};
+
  &uart0 {
 	compatible = "nordic,nrf-uarte";
 	current-speed = <1000000>;

src/main.c

@@ -412,7 +412,7 @@ uint8_t hci_cmd_iso_timesync_cb(struct net_buf *buf)
 	}
 #endif
 
-#ifdef CONFIG_SOC_NRF54L15_CPUAPP
+#if defined(CONFIG_SOC_NRF54L15_CPUAPP) || defined(CONFIG_SOC_NRF52833)
 	timestamp_second_us = (uint32_t) controller_time_us_get();
 #endif