adafruit · dhalbert · Apr 2, 2026 · Dec 18, 2025 · Apr 1, 2026 · Apr 1, 2026
diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
@@ -2411,6 +2411,7 @@ msgstr ""
 msgid "Update failed"
 msgstr ""
 
+#: ports/zephyr-cp/common-hal/audiobusio/I2SOut.c
 #: ports/zephyr-cp/common-hal/busio/I2C.c
 #: ports/zephyr-cp/common-hal/busio/SPI.c
 #: ports/zephyr-cp/common-hal/busio/UART.c

diff --git a/ports/zephyr-cp/Makefile b/ports/zephyr-cp/Makefile
@@ -68,7 +68,7 @@ run-sim:
 		echo "Populating build-native_native_sim/flash.bin from ./CIRCUITPY"; \
 		mcopy -s -i build-native_native_sim/flash.bin CIRCUITPY/* ::; \
 	fi
-	build-native_native_sim/firmware.exe --flash=build-native_native_sim/flash.bin --flash_rm -wait_uart -rt
+	build-native_native_sim/firmware.exe --flash=build-native_native_sim/flash.bin --flash_rm -wait_uart -rt --i2s_capture=build-native_native_sim/i2s_capture.wav
 
 menuconfig:
 	west build $(WEST_SHIELD_ARGS) --sysbuild -d $(BUILD) -t menuconfig -- $(WEST_CMAKE_ARGS)

diff --git a/ports/zephyr-cp/background.c b/ports/zephyr-cp/background.c
@@ -9,17 +9,7 @@
 #include "py/runtime.h"
 #include "supervisor/port.h"
 
-#if CIRCUITPY_DISPLAYIO
-#include "shared-module/displayio/__init__.h"
-#endif
-
-#if CIRCUITPY_AUDIOBUSIO
-#include "common-hal/audiobusio/I2SOut.h"
-#endif
-
-#if CIRCUITPY_AUDIOPWMIO
-#include "common-hal/audiopwmio/PWMAudioOut.h"
-#endif
+#include <zephyr/kernel.h>
 
 void port_start_background_tick(void) {
 }
@@ -28,12 +18,7 @@ void port_finish_background_tick(void) {
 }
 
 void port_background_tick(void) {
-    #if CIRCUITPY_AUDIOPWMIO
-    audiopwmout_background();
-    #endif
-    #if CIRCUITPY_AUDIOBUSIO
-    i2s_background();
-    #endif
+    // No, ticks. We use Zephyr threads instead.
 }
 
 void port_background_task(void) {

diff --git a/ports/zephyr-cp/boards/adafruit/feather_nrf52840_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/adafruit/feather_nrf52840_zephyr/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/frdm_mcxn947_mcxn947_cpu0.conf b/ports/zephyr-cp/boards/frdm_mcxn947_mcxn947_cpu0.conf
@@ -0,0 +1 @@
+CONFIG_DMA_TCD_QUEUE_SIZE=4
diff --git a/ports/zephyr-cp/boards/frdm_rw612_rw612_cpu0.overlay b/ports/zephyr-cp/boards/frdm_rw612_rw612_cpu0.overlay
@@ -0,0 +1,12 @@
+&w25q512jvfiq {
+    partitions {
+        /delete-node/ storage_partition;
+        circuitpy_partition: partition@620000 {
+				label = "circuitpy";
+				reg = <0x00620000 (DT_SIZE_M(58) - DT_SIZE_K(128))>;
+			};
+    }
+
+};
+
+#include "../app.overlay"
diff --git a/ports/zephyr-cp/boards/mimxrt1170_evk_mimxrt1176_cm7.conf b/ports/zephyr-cp/boards/mimxrt1170_evk_mimxrt1176_cm7.conf
@@ -0,0 +1 @@
+CONFIG_DMA_TCD_QUEUE_SIZE=4
diff --git a/ports/zephyr-cp/boards/mimxrt1170_evk_mimxrt1176_cm7.overlay b/ports/zephyr-cp/boards/mimxrt1170_evk_mimxrt1176_cm7.overlay
@@ -8,4 +8,8 @@
     };
 };
 
+&sai1 {
+	mclk-output;
+};
+
 #include "../app.overlay"
diff --git a/ports/zephyr-cp/boards/native/native_sim/autogen_board_info.toml b/ports/zephyr-cp/boards/native/native_sim/autogen_board_info.toml
@@ -15,14 +15,14 @@ alarm = false
 analogbufio = false
 analogio = false
 atexit = false
-audiobusio = false
-audiocore = false
-audiodelays = false
-audiofilters = false
-audiofreeverb = false
+audiobusio = true # Zephyr board has audiobusio
+audiocore = true # Zephyr board has audiobusio
+audiodelays = true # Zephyr board has audiobusio
+audiofilters = true # Zephyr board has audiobusio
+audiofreeverb = true # Zephyr board has audiobusio
 audioio = false
-audiomixer = false
-audiomp3 = false
+audiomixer = true # Zephyr board has audiobusio
+audiomp3 = true # Zephyr board has audiobusio
 audiopwmio = false
 audiospeed = false
 aurora_epaper = false
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false
@@ -97,7 +97,7 @@ ssl = false
 storage = true # Zephyr board has flash
 struct = true
 supervisor = true
-synthio = false
+synthio = true # Zephyr board has audiobusio
 terminalio = true # Zephyr board has busio
 tilepalettemapper = true # Zephyr board has busio
 time = true

diff --git a/ports/zephyr-cp/boards/native/nrf5340bsim/autogen_board_info.toml b/ports/zephyr-cp/boards/native/nrf5340bsim/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/native_sim.conf b/ports/zephyr-cp/boards/native_sim.conf
@@ -23,6 +23,9 @@ CONFIG_EEPROM=y
 CONFIG_EEPROM_AT24=y
 CONFIG_EEPROM_AT2X_EMUL=y
 
+# I2S SDL emulation for audio testing
+CONFIG_I2S_SDL=y
+
 CONFIG_NETWORKING=y
 CONFIG_NET_IPV4=y
 CONFIG_NET_TCP=y

diff --git a/ports/zephyr-cp/boards/nordic/nrf5340dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf5340dk/autogen_board_info.toml
@@ -15,14 +15,14 @@ alarm = false
 analogbufio = false
 analogio = false
 atexit = false
-audiobusio = false
-audiocore = false
-audiodelays = false
-audiofilters = false
-audiofreeverb = false
+audiobusio = true # Zephyr board has audiobusio
+audiocore = true # Zephyr board has audiobusio
+audiodelays = true # Zephyr board has audiobusio
+audiofilters = true # Zephyr board has audiobusio
+audiofreeverb = true # Zephyr board has audiobusio
 audioio = false
-audiomixer = false
-audiomp3 = false
+audiomixer = true # Zephyr board has audiobusio
+audiomp3 = true # Zephyr board has audiobusio
 audiopwmio = false
 audiospeed = false
 aurora_epaper = false
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false
@@ -97,7 +97,7 @@ ssl = false
 storage = true # Zephyr board has flash
 struct = true
 supervisor = true
-synthio = false
+synthio = true # Zephyr board has audiobusio
 terminalio = true # Zephyr board has busio
 tilepalettemapper = true # Zephyr board has busio
 time = true

diff --git a/ports/zephyr-cp/boards/nordic/nrf54h20dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf54h20dk/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/nordic/nrf54l15dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf54l15dk/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/nordic/nrf7002dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf7002dk/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/nrf5340dk_nrf5340_cpuapp.overlay b/ports/zephyr-cp/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,24 @@
+&pinctrl {
+	i2s0_default_alt: i2s0_default_alt {
+		group1 {
+			psels = <NRF_PSEL(I2S_MCK, 0, 12)>,
+				<NRF_PSEL(I2S_SCK_M, 1, 15)>,
+				<NRF_PSEL(I2S_LRCK_M, 1, 12)>,
+				<NRF_PSEL(I2S_SDOUT, 1, 13)>,
+				<NRF_PSEL(I2S_SDIN, 1, 14)>;
+		};
+	};
+};
+
+&clock {
+	hfclkaudio-frequency = <11289600>;
+};
+
+i2s_rxtx: &i2s0 {
+	status = "okay";
+	pinctrl-0 = <&i2s0_default_alt>;
+	pinctrl-names = "default";
+	clock-source = "ACLK";
+};
+
+#include "../app.overlay"
diff --git a/ports/zephyr-cp/boards/nxp/frdm_mcxn947/autogen_board_info.toml b/ports/zephyr-cp/boards/nxp/frdm_mcxn947/autogen_board_info.toml
@@ -15,14 +15,14 @@ alarm = false
 analogbufio = false
 analogio = false
 atexit = false
-audiobusio = false
-audiocore = false
-audiodelays = false
-audiofilters = false
-audiofreeverb = false
+audiobusio = true # Zephyr board has audiobusio
+audiocore = true # Zephyr board has audiobusio
+audiodelays = true # Zephyr board has audiobusio
+audiofilters = true # Zephyr board has audiobusio
+audiofreeverb = true # Zephyr board has audiobusio
 audioio = false
-audiomixer = false
-audiomp3 = false
+audiomixer = true # Zephyr board has audiobusio
+audiomp3 = true # Zephyr board has audiobusio
 audiopwmio = false
 audiospeed = false
 aurora_epaper = false
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false
@@ -97,7 +97,7 @@ ssl = false
 storage = true # Zephyr board has flash
 struct = true
 supervisor = true
-synthio = false
+synthio = true # Zephyr board has audiobusio
 terminalio = true # Zephyr board has busio
 tilepalettemapper = true # Zephyr board has busio
 time = true

diff --git a/ports/zephyr-cp/boards/nxp/frdm_rw612/autogen_board_info.toml b/ports/zephyr-cp/boards/nxp/frdm_rw612/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/nxp/mimxrt1170_evk/autogen_board_info.toml b/ports/zephyr-cp/boards/nxp/mimxrt1170_evk/autogen_board_info.toml
@@ -15,14 +15,14 @@ alarm = false
 analogbufio = false
 analogio = false
 atexit = false
-audiobusio = false
-audiocore = false
-audiodelays = false
-audiofilters = false
-audiofreeverb = false
+audiobusio = true # Zephyr board has audiobusio
+audiocore = true # Zephyr board has audiobusio
+audiodelays = true # Zephyr board has audiobusio
+audiofilters = true # Zephyr board has audiobusio
+audiofreeverb = true # Zephyr board has audiobusio
 audioio = false
-audiomixer = false
-audiomp3 = false
+audiomixer = true # Zephyr board has audiobusio
+audiomp3 = true # Zephyr board has audiobusio
 audiopwmio = false
 audiospeed = false
 aurora_epaper = false
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false
@@ -97,7 +97,7 @@ ssl = false
 storage = false
 struct = true
 supervisor = true
-synthio = false
+synthio = true # Zephyr board has audiobusio
 terminalio = true # Zephyr board has busio
 tilepalettemapper = true # Zephyr board has busio
 time = true

diff --git a/ports/zephyr-cp/boards/renesas/da14695_dk_usb/autogen_board_info.toml b/ports/zephyr-cp/boards/renesas/da14695_dk_usb/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/renesas/ek_ra6m5/autogen_board_info.toml b/ports/zephyr-cp/boards/renesas/ek_ra6m5/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/renesas/ek_ra8d1/autogen_board_info.toml b/ports/zephyr-cp/boards/renesas/ek_ra8d1/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/st/nucleo_n657x0_q/autogen_board_info.toml b/ports/zephyr-cp/boards/st/nucleo_n657x0_q/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/st/nucleo_u575zi_q/autogen_board_info.toml b/ports/zephyr-cp/boards/st/nucleo_u575zi_q/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/st/stm32h750b_dk/autogen_board_info.toml b/ports/zephyr-cp/boards/st/stm32h750b_dk/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/st/stm32h7b3i_dk/autogen_board_info.toml b/ports/zephyr-cp/boards/st/stm32h7b3i_dk/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false

diff --git a/ports/zephyr-cp/boards/st/stm32wba65i_dk1/autogen_board_info.toml b/ports/zephyr-cp/boards/st/stm32wba65i_dk1/autogen_board_info.toml
@@ -63,7 +63,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mcp4822 = false
 mdns = false
-Original file line number
+Diff line change
@@ Expand Up / @@ -8,4 +8,8 @@ @@
         };
     };
+    &sai1 {
+    	mclk-output;
+    };
     #include "../app.overlay"