Add audiobusio.I2SOut() support to Zephyr

Relies on added SDL audio emulation.

Author: tannewt

locale/circuitpython.pot

@@ -2419,6 +2419,7 @@ msgstr ""
 msgid "Use board.DISPLAY"
 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

ports/zephyr-cp/Makefile

@@ -21,7 +21,7 @@ ifeq ($(DEBUG),1)
 WEST_CMAKE_ARGS += -Dzephyr-cp_EXTRA_CONF_FILE=$(DEBUG_CONF_FILE)
 endif
 
-.PHONY: $(BUILD)/zephyr-cp/zephyr/zephyr.elf flash recover debug debug-jlink debugserver attach run run-sim clean menuconfig all clean-all test fetch-port-submodules
+.PHONY: $(BUILD)/zephyr-cp/zephyr/zephyr.elf flash recover debug attach debug-jlink debugserver attach run run-sim clean menuconfig all clean-all test fetch-port-submodules
 
 $(BUILD)/zephyr-cp/zephyr/zephyr.elf:
 	python cptools/pre_zephyr_build_prep.py $(BOARD)
@@ -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)

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) {

ports/zephyr-cp/boards/frdm_mcxn947_mcxn947_cpu0.conf

@@ -0,0 +1 @@
+CONFIG_DMA_TCD_QUEUE_SIZE=4

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"

ports/zephyr-cp/boards/mimxrt1170_evk_mimxrt1176_cm7.conf

@@ -0,0 +1 @@
+CONFIG_DMA_TCD_QUEUE_SIZE=4

ports/zephyr-cp/boards/mimxrt1170_evk_mimxrt1176_cm7.overlay

@@ -8,4 +8,8 @@
     };
 };
 
+&sai1 {
+	mclk-output;
+};
+
 #include "../app.overlay"

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
 aurora_epaper = false
 bitbangio = false
@@ -62,7 +62,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mdns = false
 memorymap = false
@@ -94,7 +94,7 @@ 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

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

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
 aurora_epaper = false
 bitbangio = false
@@ -62,7 +62,7 @@ keypad = false
 keypad_demux = false
 locale = false
 lvfontio = true # Zephyr board has busio
-math = false
+math = true
 max3421e = false
 mdns = false
 memorymap = false
@@ -94,7 +94,7 @@ 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