esp32-sparrow-kit: Add I2S support for the board's microphone

The board's microphone uses 24-bit i2s and this commit also fixes
the segmentation fault caused by the audio buffer overflow.

arch/xtensa/src/esp32/esp32_i2s.c: Fix bug regarding 24-bit audio and add AUDIOIOC_STOP to ioctl
drivers/audio/audio_i2s.c: Report number of channels on AUDIOIOC_GETCAPS
in boards/xtensa/esp32/esp32-sparrow-kit:
	/configs/nsh/defconfig: Add I2S configs
	/src/esp32-sparrow-kit.h: Add the signature of esp32_i2sdev_initialize()
	/src/esp32_bringup.c: Add call to esp32_i2sdev_initialize()

Signed-off-by: simonatoaca <simona.alexandra2000@gmail.com>

boards/xtensa/esp32/esp32-sparrow-kit/configs/nsh/defconfig

@@ -22,12 +22,26 @@ CONFIG_ARCH_CHIP_ESP32=y
 CONFIG_ARCH_CHIP_ESP32WROVER=y
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_XTENSA=y
+CONFIG_AUDIO=y
+CONFIG_AUDIO_DMA=y
+CONFIG_AUDIO_FORMAT_RAW=y
+CONFIG_AUDIO_I2S=y
 CONFIG_BME680_ENABLE_IIR_FILTER=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
+CONFIG_DMA=y
+CONFIG_DMA_LINK=y
+CONFIG_DRIVERS_AUDIO=y
 CONFIG_DRIVERS_VIDEO=y
 CONFIG_ESP32_I2C0=y
 CONFIG_ESP32_I2C0_SDAPIN=21
+CONFIG_ESP32_I2S0=y
+CONFIG_ESP32_I2S0_BCLKPIN=25
+CONFIG_ESP32_I2S0_DATA_BIT_WIDTH_24BIT=y
+CONFIG_ESP32_I2S0_DINPIN=26
+CONFIG_ESP32_I2S0_SAMPLE_RATE=8000
+CONFIG_ESP32_I2S0_WSPIN=27
+CONFIG_ESP32_I2S=y
 CONFIG_ESP32_LEDC=y
 CONFIG_ESP32_LEDC_CHANNEL0_PIN=14
 CONFIG_ESP32_LEDC_CHANNEL1_PIN=13
@@ -47,6 +61,7 @@ CONFIG_FS_FAT=y
 CONFIG_FS_PROCFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_I2S_DMADESC_NUM=4
 CONFIG_IDLETHREAD_STACKSIZE=3072
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_INTELHEX_BINARY=y
@@ -75,6 +90,7 @@ CONFIG_RGBLED_INVERT=y
 CONFIG_RGBLED_LIGHTNESS_CORRECTION=y
 CONFIG_RGBLED_PWM_FREQ=200
 CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_SENSORS=y
 CONFIG_SENSORS_BME680=y

boards/xtensa/esp32/esp32-sparrow-kit/src/esp32-sparrow-kit.h

@@ -106,6 +106,28 @@ int esp32_mmcsd_initialize(int minor);
 
 int esp32_spiflash_init(void);
 
+/****************************************************************************
+ * Name: board_i2sdev_initialize
+ *
+ * Description:
+ *   This function is called by platform-specific, setup logic to configure
+ *   and register the generic I2S audio driver.  This function will register
+ *   the driver as /dev/audio/pcm[x] where x is determined by the I2S port
+ *   number.
+ *
+ * Input Parameters:
+ *   port  - The I2S port used for the device
+ *
+ * Returned Value:
+ *   Zero is returned on success.  Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+#if defined CONFIG_ESP32_I2S0 || defined CONFIG_ESP32_I2S1
+int board_i2sdev_initialize(int port);
+#endif
+
 /****************************************************************************
  * Name: esp32_gpio_init
  ****************************************************************************/

boards/xtensa/esp32/esp32-sparrow-kit/src/esp32_bringup.c

@@ -80,6 +80,10 @@
 #  include "esp32_board_i2c.h"
 #endif
 
+#ifdef CONFIG_ESP32_I2S
+#  include "esp32_i2s.h"
+#endif
+
 #ifdef CONFIG_SENSORS_BMP180
 #  include "esp32_bmp180.h"
 #endif
@@ -343,6 +347,23 @@ int esp32_bringup(void)
 
 #endif
 
+#ifdef CONFIG_ESP32_I2S
+
+#ifdef CONFIG_ESP32_I2S0
+
+  /* Configure I2S generic audio on I2S0 */
+
+  ret = board_i2sdev_initialize(ESP32_I2S0);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to initialize I2S%d driver: %d\n",
+             CONFIG_ESP32_I2S0, ret);
+    }
+
+#endif  /* CONFIG_ESP32_I2S0 */
+
+#endif /* CONFIG_ESP32_I2S */
+
 #ifdef CONFIG_SENSORS_BMP180
   /* Try to register BMP180 device in I2C0 */