FelipeMdeO opened a new pull request, #20004:
URL: https://github.com/apache/nuttx/pull/20004
The XIAO ESP32-S3 Sense's onboard microSD slot (Seeed XIAOML Kit) is wired
to SPI2 through the GPIO matrix: SCK=GPIO7, MOSI=GPIO9, MISO=GPIO8 (confirmed
against espressif/arduino-esp32's XIAO_ESP32S3/pins_arduino.h) and CS=GPIO21
(confirmed against this project's own working xiaoml_bench_logger.ino, which
tries CS candidates {21, 3} in that order -- GPIO3 is a documented fallback,
not the real pin; a Seeed wiki page that names GPIO3 as CS turned out to be
wrong and was the initial, unsuccessful attempt here).
Wires up board_sdmmc_spi_initialize() (common esp32s3 board code,
CONFIG_MMCSD_SPI) into this board's bringup, and adds the esp32s3_spi2_status()
callback (SPI_STATUS_PRESENT for SPIDEV_MMCSD(0)) that esp32s3-devkit and other
in-tree boards already provide -- the esp32s3-xiao board had no SPI board file
at all before this.
Validated on the bench: CMD0/CMD41/CMD58 handshake succeeds, SD ver2 card
identified (SanDisk 32GB, 62333952 sectors), mounts as vfat, survives
umount+remount with a written file intact.
Needed board defconfig additions (not included in this NuttX-tree commit;
see the 61680_FW project repo for the board config that turns this on):
```
CONFIG_ESP32S3_SPI2=y
CONFIG_ESP32S3_SPI2_CSPIN=21
CONFIG_ESP32S3_SPI2_CLKPIN=7
CONFIG_ESP32S3_SPI2_MOSIPIN=9
CONFIG_ESP32S3_SPI2_MISOPIN=8
CONFIG_MMCSD=y
CONFIG_NSH_MMCSDSPIPORTNO=2
CONFIG_FS_FAT=y
CONFIG_FAT_LFN=y
CONFIG_FAT_LCNAMES=y
```
- Real Testing
```
nsh> mount -t vfat /dev/mmcsd0 /mnt
fat_checkbootrecord: WARNING: Signature: aa55 FS sectorsize: 0 HW
sectorsize: 512
nsh> mount
/etc type romfs
/mnt type vfat
/proc type procfs
nsh> echo "hello sd card 61680_FW" > /mnt/test.txt
nsh> ls -l /mnt
/mnt:
drw-rw-rw- 0 RUN00001/
drw-rw-rw- 0 RUN00002/
drw-rw-rw- 0 RUN00003/
-rw-rw-rw- 23 test.txt
drw-rw-rw- 0 System Volume Information/
nsh> cat /mnt/test.txt
hello sd card 61680_FW
nsh> umount /mnt
nsh> mount -t vfat /dev/mmcsd0 /mnt
fat_checkbootrecord: WARNING: Signature: aa55 FS sectorsize: 0 HW
sectorsize: 512
nsh> cat /mnt/test.txt
hello sd card 61680_FW
```
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