Add I2S MCLK support to iMX RT

tannewt · tannewt · commit 8c5c73df38ea · 2023-08-17T11:39:14.000-07:00
diff --git a/ports/atmel-samd/common-hal/audiobusio/I2SOut.c b/ports/atmel-samd/common-hal/audiobusio/I2SOut.c
@@ -98,7 +98,10 @@ void i2sout_reset(void) {
 // Caller validates that pins are free.
 void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t *self,
     const mcu_pin_obj_t *bit_clock, const mcu_pin_obj_t *word_select,
-    const mcu_pin_obj_t *data, bool left_justified) {
+    const mcu_pin_obj_t *data, const mcu_pin_obj_t *main_clock, bool left_justified) {
+    if (main_clock != NULL) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_main_clock);
+    }
     uint8_t serializer = 0xff;
     uint8_t bc_clock_unit = 0xff;
     uint8_t ws_clock_unit = 0xff;
diff --git a/ports/espressif/common-hal/audiobusio/I2SOut.c b/ports/espressif/common-hal/audiobusio/I2SOut.c
@@ -49,8 +49,10 @@
 // Caller validates that pins are free.
 void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t *self,
     const mcu_pin_obj_t *bit_clock, const mcu_pin_obj_t *word_select,
-    const mcu_pin_obj_t *data, bool left_justified) {
-
+    const mcu_pin_obj_t *data, const mcu_pin_obj_t *main_clock, bool left_justified) {
+    if (main_clock != NULL) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_main_clock);
+    }
     port_i2s_allocate_init(&self->peripheral, left_justified);
 
     i2s_pin_config_t i2s_pin_config = {
diff --git a/ports/mimxrt10xx/common-hal/audiobusio/I2SOut.c b/ports/mimxrt10xx/common-hal/audiobusio/I2SOut.c
@@ -74,13 +74,22 @@ STATIC void config_periph_pin(const mcu_periph_obj_t *periph) {
 // Caller validates that pins are free.
 void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t *self,
     const mcu_pin_obj_t *bit_clock, const mcu_pin_obj_t *word_select,
-    const mcu_pin_obj_t *data, bool left_justified) {
+    const mcu_pin_obj_t *data, const mcu_pin_obj_t *main_clock, bool left_justified) {
 
     int instance = -1;
     const mcu_periph_obj_t *bclk_periph = find_pin_function(mcu_i2s_tx_bclk_list, bit_clock, &instance, MP_QSTR_bit_clock);
     const mcu_periph_obj_t *sync_periph = find_pin_function(mcu_i2s_tx_sync_list, word_select, &instance, MP_QSTR_word_select);
     const mcu_periph_obj_t *data_periph = find_pin_function(mcu_i2s_tx_data0_list, data, &instance, MP_QSTR_data);
 
+    if (main_clock != NULL) {
+        const mcu_periph_obj_t *mclk_periph = find_pin_function(mcu_i2s_mclk_list, main_clock, &instance, MP_QSTR_main_clock);
+        self->mclk = main_clock;
+        claim_pin(main_clock);
+        config_periph_pin(mclk_periph);
+        IOMUXC_GPR->GPR1 |= IOMUXC_GPR_GPR1_SAI1_MCLK_DIR_MASK << (instance - 1);
+    }
+    self->instance = instance;
+
     sai_transceiver_t config;
     SAI_GetClassicI2SConfig(&config, 16, kSAI_Stereo, 1);
     config.syncMode = kSAI_ModeAsync;
@@ -121,6 +130,11 @@ void common_hal_audiobusio_i2sout_deinit(audiobusio_i2sout_obj_t *self) {
 
     common_hal_reset_pin(self->data);
     self->data = NULL;
+
+    IOMUXC_GPR->GPR1 &= ~(IOMUXC_GPR_GPR1_SAI1_MCLK_DIR_MASK << (self->instance - 1));
+
+    common_hal_reset_pin(self->mclk);
+    self->mclk = NULL;
 }
 
 void common_hal_audiobusio_i2sout_play(audiobusio_i2sout_obj_t *self,
diff --git a/ports/mimxrt10xx/common-hal/audiobusio/I2SOut.h b/ports/mimxrt10xx/common-hal/audiobusio/I2SOut.h
@@ -39,6 +39,8 @@ typedef struct {
     const mcu_pin_obj_t *bit_clock;
     const mcu_pin_obj_t *word_select;
     const mcu_pin_obj_t *data;
+    const mcu_pin_obj_t *mclk;
+    uint8_t instance;
 } audiobusio_i2sout_obj_t;
 
 #endif
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.c
@@ -174,6 +174,12 @@ const mcu_periph_obj_t mcu_i2s_tx_sync_list[2] = {
     PERIPH_PIN(3, 1, 0, 0, &pin_GPIO_SD_00),
 };
 
+const mcu_periph_obj_t mcu_i2s_mclk_list[2] = {
+    PERIPH_PIN(1, 0, 0, 0, &pin_GPIO_08),
+
+    PERIPH_PIN(3, 1, 0, 0, &pin_GPIO_00),
+};
+
 const mcu_periph_obj_t mcu_mqs_left_list[1] = {
     PERIPH_PIN(3, 4, 0, 0, &pin_GPIO_AD_01),
 };
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h
@@ -56,6 +56,7 @@ extern const mcu_periph_obj_t mcu_i2s_rx_sync_list[2];
 extern const mcu_periph_obj_t mcu_i2s_tx_bclk_list[2];
 extern const mcu_periph_obj_t mcu_i2s_tx_data0_list[2];
 extern const mcu_periph_obj_t mcu_i2s_tx_sync_list[2];
+extern const mcu_periph_obj_t mcu_i2s_mclk_list[2];
 
 extern const mcu_periph_obj_t mcu_mqs_left_list[1];
 extern const mcu_periph_obj_t mcu_mqs_right_list[1];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/periph.c
@@ -159,6 +159,16 @@ const mcu_periph_obj_t mcu_i2s_tx_sync_list[4] = {
     PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_SD_B1_07),
 };
 
+const mcu_periph_obj_t mcu_i2s_mclk_list[5] = {
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_EMC_20),
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_AD_B0_03),
+
+    PERIPH_PIN(2, 3, 0, 0, &pin_GPIO_EMC_16),
+
+    PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_17),
+    PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_SD_B1_05),
+};
+
 const mcu_periph_obj_t mcu_mqs_left_list[2] = {
     PERIPH_PIN(3, 2, 0, 0, &pin_GPIO_EMC_17),
     PERIPH_PIN(3, 1, 0, 0, &pin_GPIO_AD_B0_07),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/periph.h
@@ -56,6 +56,7 @@ extern const mcu_periph_obj_t mcu_i2s_rx_sync_list[3];
 extern const mcu_periph_obj_t mcu_i2s_tx_bclk_list[4];
 extern const mcu_periph_obj_t mcu_i2s_tx_data0_list[4];
 extern const mcu_periph_obj_t mcu_i2s_tx_sync_list[4];
+extern const mcu_periph_obj_t mcu_i2s_mclk_list[5];
 
 extern const mcu_periph_obj_t mcu_mqs_left_list[2];
 extern const mcu_periph_obj_t mcu_mqs_right_list[2];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.c
@@ -268,6 +268,20 @@ const mcu_periph_obj_t mcu_i2s_tx_sync_list[7] = {
     PERIPH_PIN(3, 3, kIOMUXC_SAI3_TX_SYNC_SELECT_INPUT, 1, &pin_GPIO_EMC_34),
 };
 
+const mcu_periph_obj_t mcu_i2s_mclk_list[9] = {
+    PERIPH_PIN(1, 2, kIOMUXC_SAI1_MCLK_SELECT_INPUT, 0, &pin_GPIO_SD_B0_00),
+    PERIPH_PIN(1, 3, kIOMUXC_SAI1_MCLK_SELECT_INPUT, 1, &pin_GPIO_AD_B0_03),
+    PERIPH_PIN(1, 3, kIOMUXC_SAI1_MCLK_SELECT_INPUT, 2, &pin_GPIO_AD_B1_00),
+    PERIPH_PIN(1, 3, kIOMUXC_SAI1_MCLK_SELECT_INPUT, 3, &pin_GPIO_EMC_20),
+
+    PERIPH_PIN(2, 3, kIOMUXC_SAI2_MCLK_SELECT_INPUT, 0, &pin_GPIO_SD_B0_00),
+    PERIPH_PIN(2, 3, kIOMUXC_SAI2_MCLK_SELECT_INPUT, 1, &pin_GPIO_EMC_16),
+
+    PERIPH_PIN(3, 3, kIOMUXC_SAI3_MCLK_SELECT_INPUT, 0, &pin_GPIO_SD_B1_05),
+    PERIPH_PIN(3, 3, kIOMUXC_SAI3_MCLK_SELECT_INPUT, 1, &pin_GPIO_EMC_17),
+    PERIPH_PIN(3, 3, kIOMUXC_SAI3_MCLK_SELECT_INPUT, 2, &pin_GPIO_EMC_28),
+};
+
 const mcu_periph_obj_t mcu_mqs_left_list[3] = {
     PERIPH_PIN(3, 2, 0, 0, &pin_GPIO_EMC_17),
     PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_38),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.h
@@ -56,6 +56,7 @@ extern const mcu_periph_obj_t mcu_i2s_rx_sync_list[7];
 extern const mcu_periph_obj_t mcu_i2s_tx_bclk_list[7];
 extern const mcu_periph_obj_t mcu_i2s_tx_data0_list[7];
 extern const mcu_periph_obj_t mcu_i2s_tx_sync_list[7];
+extern const mcu_periph_obj_t mcu_i2s_mclk_list[9];
 
 extern const mcu_periph_obj_t mcu_mqs_left_list[3];
 extern const mcu_periph_obj_t mcu_mqs_right_list[3];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/periph.c
@@ -254,6 +254,17 @@ const mcu_periph_obj_t mcu_i2s_tx_sync_list[6] = {
     PERIPH_PIN(3, 8, 0, 0, &pin_GPIO_SD_B1_02),
 };
 
+const mcu_periph_obj_t mcu_i2s_mclk_list[6] = {
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_B0_13),
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_SD_B1_03),
+
+    PERIPH_PIN(2, 2, 0, 0, &pin_GPIO_EMC_07),
+    PERIPH_PIN(2, 3, 0, 0, &pin_GPIO_AD_B0_10),
+
+    PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_37),
+    PERIPH_PIN(3, 8, 0, 0, &pin_GPIO_SD_B1_04),
+};
+
 const mcu_periph_obj_t mcu_mqs_left_list[3] = {
     PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_14),
     PERIPH_PIN(3, 1, 0, 0, &pin_GPIO_AD_B0_05),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/periph.h
@@ -56,6 +56,7 @@ extern const mcu_periph_obj_t mcu_i2s_rx_sync_list[6];
 extern const mcu_periph_obj_t mcu_i2s_tx_bclk_list[6];
 extern const mcu_periph_obj_t mcu_i2s_tx_data0_list[6];
 extern const mcu_periph_obj_t mcu_i2s_tx_sync_list[6];
+extern const mcu_periph_obj_t mcu_i2s_mclk_list[6];
 
 extern const mcu_periph_obj_t mcu_mqs_left_list[3];
 extern const mcu_periph_obj_t mcu_mqs_right_list[3];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/periph.c
@@ -267,6 +267,17 @@ const mcu_periph_obj_t mcu_i2s_tx_sync_list[6] = {
     PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_39),
 };
 
+const mcu_periph_obj_t mcu_i2s_mclk_list[6] = {
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_AD_B1_09),
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_B0_13),
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_SD_B1_03),
+
+    PERIPH_PIN(2, 2, 0, 0, &pin_GPIO_EMC_07),
+    PERIPH_PIN(2, 3, 0, 0, &pin_GPIO_AD_B0_10),
+
+    PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_37),
+};
+
 const mcu_periph_obj_t mcu_mqs_left_list[3] = {
     PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_14),
     PERIPH_PIN(3, 1, 0, 0, &pin_GPIO_AD_B0_05),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/periph.h
@@ -56,6 +56,7 @@ extern const mcu_periph_obj_t mcu_i2s_rx_sync_list[6];
 extern const mcu_periph_obj_t mcu_i2s_tx_bclk_list[6];
 extern const mcu_periph_obj_t mcu_i2s_tx_data0_list[6];
 extern const mcu_periph_obj_t mcu_i2s_tx_sync_list[6];
+extern const mcu_periph_obj_t mcu_i2s_mclk_list[6];
 
 extern const mcu_periph_obj_t mcu_mqs_left_list[3];
 extern const mcu_periph_obj_t mcu_mqs_right_list[3];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.c
@@ -272,6 +272,18 @@ const mcu_periph_obj_t mcu_i2s_tx_sync_list[7] = {
     PERIPH_PIN(3, 8, 0, 0, &pin_GPIO_SD_B1_02),
 };
 
+const mcu_periph_obj_t mcu_i2s_mclk_list[7] = {
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_AD_B1_09),
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_B0_13),
+    PERIPH_PIN(1, 3, 0, 0, &pin_GPIO_SD_B1_03),
+
+    PERIPH_PIN(2, 2, 0, 0, &pin_GPIO_EMC_07),
+    PERIPH_PIN(2, 3, 0, 0, &pin_GPIO_AD_B0_10),
+
+    PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_37),
+    PERIPH_PIN(3, 8, 0, 0, &pin_GPIO_SD_B1_04),
+};
+
 const mcu_periph_obj_t mcu_mqs_left_list[3] = {
     PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_14),
     PERIPH_PIN(3, 1, 0, 0, &pin_GPIO_AD_B0_05),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h
@@ -56,6 +56,7 @@ extern const mcu_periph_obj_t mcu_i2s_rx_sync_list[7];
 extern const mcu_periph_obj_t mcu_i2s_tx_bclk_list[7];
 extern const mcu_periph_obj_t mcu_i2s_tx_data0_list[7];
 extern const mcu_periph_obj_t mcu_i2s_tx_sync_list[7];
+extern const mcu_periph_obj_t mcu_i2s_mclk_list[7];
 
 extern const mcu_periph_obj_t mcu_mqs_left_list[3];
 extern const mcu_periph_obj_t mcu_mqs_right_list[3];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/periph.c
@@ -237,6 +237,15 @@ const mcu_periph_obj_t mcu_i2s_tx_sync_list[4] = {
     PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_B2_16),
 };
 
+const mcu_periph_obj_t mcu_i2s_mclk_list[4] = {
+    PERIPH_PIN(1, 0, 0, 0, &pin_GPIO_AD_17),
+    PERIPH_PIN(1, 4, 0, 0, &pin_GPIO_DISP_B2_03),
+
+    PERIPH_PIN(2, 2, 0, 0, &pin_GPIO_EMC_B2_04),
+
+    PERIPH_PIN(3, 3, 0, 0, &pin_GPIO_EMC_B2_17),
+};
+
 const mcu_periph_obj_t mcu_mqs_left_list[2] = {
     PERIPH_PIN(3, 2, 0, 0, &pin_GPIO_EMC_B1_41),
     PERIPH_PIN(3, 2, 0, 0, &pin_GPIO_DISP_B2_01),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/periph.h
@@ -56,6 +56,7 @@ extern const mcu_periph_obj_t mcu_i2s_rx_sync_list[4];
 extern const mcu_periph_obj_t mcu_i2s_tx_bclk_list[4];
 extern const mcu_periph_obj_t mcu_i2s_tx_data0_list[4];
 extern const mcu_periph_obj_t mcu_i2s_tx_sync_list[4];
+extern const mcu_periph_obj_t mcu_i2s_mclk_list[4];
 
 extern const mcu_periph_obj_t mcu_mqs_left_list[2];
 extern const mcu_periph_obj_t mcu_mqs_right_list[2];
diff --git a/ports/mimxrt10xx/tools/gen_peripherals_data.py b/ports/mimxrt10xx/tools/gen_peripherals_data.py
@@ -6,7 +6,7 @@
     "LPI2C": ["SDA", "SCL"],
     "LPSPI": ["SCK", "SDO", "SDI"],
     "LPUART": ["RX", "TX", "RTS", "CTS"],
-    "I2S": ["RX_DATA0", "RX_SYNC", "TX_BCLK", "TX_DATA0", "TX_SYNC"],
+    "I2S": ["RX_DATA0", "RX_SYNC", "TX_BCLK", "TX_DATA0", "TX_SYNC", "MCLK"],
     "MQS": ["LEFT", "RIGHT"],
 }
 
diff --git a/ports/nrf/common-hal/audiobusio/I2SOut.c b/ports/nrf/common-hal/audiobusio/I2SOut.c
@@ -202,7 +202,10 @@ static void i2s_buffer_fill(audiobusio_i2sout_obj_t *self) {
 
 void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t *self,
     const mcu_pin_obj_t *bit_clock, const mcu_pin_obj_t *word_select,
-    const mcu_pin_obj_t *data, bool left_justified) {
+    const mcu_pin_obj_t *data, const mcu_pin_obj_t *main_clock, bool left_justified) {
+    if (main_clock != NULL) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_main_clock);
+    }
     if (instance) {
         mp_raise_RuntimeError(translate("Device in use"));
     }
diff --git a/ports/raspberrypi/common-hal/audiobusio/I2SOut.c b/ports/raspberrypi/common-hal/audiobusio/I2SOut.c
@@ -103,7 +103,10 @@ void i2sout_reset(void) {
 // Caller validates that pins are free.
 void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t *self,
     const mcu_pin_obj_t *bit_clock, const mcu_pin_obj_t *word_select,
-    const mcu_pin_obj_t *data, bool left_justified) {
+    const mcu_pin_obj_t *data, const mcu_pin_obj_t *main_clock, bool left_justified) {
+    if (main_clock != NULL) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_main_clock);
+    }
     if (bit_clock->number != word_select->number - 1) {
         mp_raise_ValueError(translate("Bit clock and word select must be sequential pins"));
     }
diff --git a/shared-bindings/audiobusio/I2SOut.c b/shared-bindings/audiobusio/I2SOut.c
@@ -44,13 +44,15 @@
 //|         word_select: microcontroller.Pin,
 //|         data: microcontroller.Pin,
 //|         *,
-//|         left_justified: bool
+//|         main_clock: microcontroller.Pin = None,
+//|         left_justified: bool = False
 //|     ) -> None:
 //|         """Create a I2SOut object associated with the given pins.
 //|
 //|         :param ~microcontroller.Pin bit_clock: The bit clock (or serial clock) pin
 //|         :param ~microcontroller.Pin word_select: The word select (or left/right clock) pin
 //|         :param ~microcontroller.Pin data: The data pin
+//|         :param ~microcontroller.Pin main_clock: The main clock pin
 //|         :param bool left_justified: True when data bits are aligned with the word select clock. False
 //|           when they are shifted by one to match classic I2S protocol.
 //|
@@ -100,11 +102,12 @@ STATIC mp_obj_t audiobusio_i2sout_make_new(const mp_obj_type_t *type, size_t n_a
     mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_I2SOut);
     return NULL;                // Not reachable.
     #else
-    enum { ARG_bit_clock, ARG_word_select, ARG_data, ARG_left_justified };
+    enum { ARG_bit_clock, ARG_word_select, ARG_data, ARG_main_clock, ARG_left_justified };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_bit_clock, MP_ARG_OBJ | MP_ARG_REQUIRED },
         { MP_QSTR_word_select, MP_ARG_OBJ | MP_ARG_REQUIRED },
         { MP_QSTR_data, MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_main_clock, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
         { MP_QSTR_left_justified, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_bool = false} },
     };
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
@@ -113,10 +116,11 @@ STATIC mp_obj_t audiobusio_i2sout_make_new(const mp_obj_type_t *type, size_t n_a
     const mcu_pin_obj_t *bit_clock = validate_obj_is_free_pin(args[ARG_bit_clock].u_obj, MP_QSTR_bit_clock);
     const mcu_pin_obj_t *word_select = validate_obj_is_free_pin(args[ARG_word_select].u_obj, MP_QSTR_word_select);
     const mcu_pin_obj_t *data = validate_obj_is_free_pin(args[ARG_data].u_obj, MP_QSTR_data);
+    const mcu_pin_obj_t *main_clock = validate_obj_is_free_pin_or_none(args[ARG_main_clock].u_obj, MP_QSTR_main_clock);
 
     audiobusio_i2sout_obj_t *self = m_new_obj_with_finaliser(audiobusio_i2sout_obj_t);
     self->base.type = &audiobusio_i2sout_type;
-    common_hal_audiobusio_i2sout_construct(self, bit_clock, word_select, data, args[ARG_left_justified].u_bool);
+    common_hal_audiobusio_i2sout_construct(self, bit_clock, word_select, data, main_clock, args[ARG_left_justified].u_bool);
 
     return MP_OBJ_FROM_PTR(self);
     #endif
diff --git a/shared-bindings/audiobusio/I2SOut.h b/shared-bindings/audiobusio/I2SOut.h
@@ -37,7 +37,7 @@ extern const mp_obj_type_t audiobusio_i2sout_type;
 
 void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t *self,
     const mcu_pin_obj_t *bit_clock, const mcu_pin_obj_t *word_select, const mcu_pin_obj_t *data,
-    bool left_justified);
+    const mcu_pin_obj_t *main_clock, bool left_justified);
 
 void common_hal_audiobusio_i2sout_deinit(audiobusio_i2sout_obj_t *self);
 bool common_hal_audiobusio_i2sout_deinited(audiobusio_i2sout_obj_t *self);
