esp32/machine_i2s: Add MICROPY_PY_MACHINE_I2S option, enable by default.

Signed-off-by: Damien George <damien@micropython.org>

ports/esp32/machine_i2s.c

@@ -38,6 +38,8 @@
 #include "modmachine.h"
 #include "mphalport.h"
 
+#if MICROPY_PY_MACHINE_I2S
+
 #include "driver/i2s.h"
 #include "soc/i2s_reg.h"
 #include "freertos/FreeRTOS.h"
@@ -807,3 +809,5 @@ const mp_obj_type_t machine_i2s_type = {
     .make_new = machine_i2s_make_new,
     .locals_dict = (mp_obj_dict_t *)&machine_i2s_locals_dict,
 };
+
+#endif // MICROPY_PY_MACHINE_I2S

ports/esp32/main.c

@@ -138,7 +138,9 @@ soft_reset:
 
     // initialise peripherals
     machine_pins_init();
+    #if MICROPY_PY_MACHINE_I2S
     machine_i2s_init0();
+    #endif
 
     // run boot-up scripts
     pyexec_frozen_module("_boot.py");

ports/esp32/modmachine.c

@@ -282,7 +282,9 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     #endif
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&machine_hw_i2c_type) },
     { MP_ROM_QSTR(MP_QSTR_SoftI2C), MP_ROM_PTR(&mp_machine_soft_i2c_type) },
+    #if MICROPY_PY_MACHINE_I2S
     { MP_ROM_QSTR(MP_QSTR_I2S), MP_ROM_PTR(&machine_i2s_type) },
+    #endif
     { MP_ROM_QSTR(MP_QSTR_PWM), MP_ROM_PTR(&machine_pwm_type) },
     { MP_ROM_QSTR(MP_QSTR_RTC), MP_ROM_PTR(&machine_rtc_type) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&machine_hw_spi_type) },

ports/esp32/mpconfigport.h

@@ -156,6 +156,9 @@
 #ifndef MICROPY_PY_MACHINE_DAC
 #define MICROPY_PY_MACHINE_DAC              (1)
 #endif
+#ifndef MICROPY_PY_MACHINE_I2S
+#define MICROPY_PY_MACHINE_I2S              (1)
+#endif
 #ifndef MICROPY_HW_ENABLE_SDCARD
 #define MICROPY_HW_ENABLE_SDCARD            (1)
 #endif