The loops waiting for the card to leave its busy state started their yield
backoff at 100 ms. A card is typically busy for a few milliseconds after a
write, so the backoff never fired and every write was followed by hundreds
of back-to-back CMD13 commands. Occupying the host controller like this
slows down unrelated work on both cores, not just the calling task.
Delay between polls instead, starting at CONFIG_SD_READY_POLL_PERIOD_START_US
(100 us) and doubling. Both the delay and the configured start period are
capped at one FreeRTOS tick period, where vTaskDelay() already yields and one
command per tick is not a storm. A typical wait now costs a handful of
commands instead of hundreds.
Applies to sdmmc_wait_for_idle(), sdmmc_init_sd_wait_data_ready() and
read_tuning_block().
Closes https://github.com/espressif/esp-idf/issues/19034
This has the potential of speeding up SD card access significantly.
Reusing the DMA aligned buffer gives the additional option of having to
allocate the transaction buffer only once instead of for every
transaction, while still keeping the improved transaction time.
To give users the maximum amount of control, the Kconfig option for the
transaction buffer size applies only to the temporary buffer, which is
only allocated if the DMA aligned buffer has not been pre-allocated.
Closes https://github.com/espressif/esp-idf/pull/17642
Co-authored-by: Adam Múdry <adam.mudry@espressif.com>
options.
Erase command (38) for SD cards allows option for erase/dicard/fule
operation at block level and for MMC cards supports option for
discard/trim at block level. When Sanitize is executed only the
portion of data that was unmapped by a Discard command shall be
removed by the Sanitize command.
Unit test cases added to verify ERASE feature in SD/SDSPI mode.
TRIM/DISCARD/SANITIZE tests for eMMC devices.
Closes https://github.com/espressif/esp-idf/pull/7635
Closes https://github.com/espressif/esp-idf/issues/7623
FATFS provides a disk status and disk initialize callback which were not
implemented. Implementation has very low impact on SD/MMC speed and
fixes issues, when trying to open file when SD card was removed from
slot and not deinited.
If disk_status returns STA_NOINIT, it will always continue with
disk_initialize. If that returns 0, it will continue like everything is
working normally. So there has to be the same check as in disk_status.
Return of disk_initialize is always checked like this for STA_NOINIT or
STA_PROTECT so if command fails, we return the STA_NOINIT.
stat = disk_initialize(pdrv);
if (stat & STA_NOINIT) return FR_NOT_READY;
if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
Closes IDF-4125
- Add SDIO support at protocol layer (probing, data transfer, interrupts)
- Add SDIO interrupts support in SDMMC host
- Add test (communicate with ESP32 in SDIO download mode)
