I2S support on STM32H7

[saraverbeecke]

Hello,
I flashed my NUCELO-H723ZG board with the latest MicroPython build and MicroPython runs well:

MPY: sync filesystems
MPY: soft reboot
MicroPython v1.20.0 on 2023-04-26; NUCLEO_H723ZG with STM32H723ZGT6
Type "help()" for more information.
>>>

Now I want to use the I2S bus but the machine module has no I2S...

AttributeError: 'module' object has no attribute 'I2S'

I tried to add:

#define MICROPY_HW_I2S1             (1)
#define MICROPY_HW_I2S2             (1)

to the mpconfigboard.h but then I get another build error when running make BOARD=NUCLEO_H723ZG:

CC ../../lib/mbedtls_errors/mp_mbedtls_errors.c
In file included from ./mbedtls/mbedtls_config.h:42,
                 from ../../lib/mbedtls_errors/mp_mbedtls_errors.c:25:
../../extmod/mbedtls/mbedtls_config_common.h:111:10: fatal error: mbedtls/check_config.h: No such file or directory
  111 | #include "mbedtls/check_config.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

So I removed the require("bundle-networking") line in the manifest.py (since I don't need the networking capabilities) I got the following build error when re-running make BOARD=NUCLEO_H723ZG:

CC dma.c
dma.c:137:30: error: 'dma_init_struct_i2s' defined but not used [-Werror=unused-const-variable=]
  137 | static const DMA_InitTypeDef dma_init_struct_i2s = {
      |                              ^~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Any ideas how to get the I2S bus wokring on the NUCLEO-H723ZG board?
Thanks