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feat(sd_mmc) Make UHS-I SDR the default for ESP-P4 SD_MMC #12038

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feat(sd_mmc) Make UHS-I SDR the default for ESP-P4 SD_MMC #12038

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b333d4c
feat(sd_mmc): Make UHS-I SDR the default for ESP-P4 SD_MMC
lbernstone Nov 17, 2025
bca5f68
Allow setting DDR, and only enable UHS for higher frequencies
lbernstone Dec 6, 2025
4716fc0
Fix indentation
lbernstone Dec 6, 2025
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4 changes: 4 additions & 0 deletions libraries/SD_MMC/src/SD_MMC.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -246,6 +246,10 @@ bool SDMMCFS::begin(const char *mountpoint, bool mode1bit, bool format_if_mount_
.width = 4,
.flags = 0,
};
#ifdef SOC_SDMMC_UHS_I_SUPPORTED
host.flags &= ~SDMMC_HOST_FLAG_DDR;
slot_config.flags = SDMMC_SLOT_FLAG_UHS1;
#endif
#else
host.slot = SDMMC_HOST_SLOT_1;
#endif
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4 changes: 4 additions & 0 deletions libraries/SD_MMC/src/SD_MMC.h
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Expand Up @@ -30,8 +30,12 @@
// you can define BOARD_MAX_SDMMC_FREQ with lower value (Ex. SDMMC_FREQ_DEFAULT)
// in pins_arduino.h for your board variant.
#ifndef BOARD_MAX_SDMMC_FREQ
#ifdef SOC_SDMMC_UHS_I_SUPPORTED
#define BOARD_MAX_SDMMC_FREQ SDMMC_FREQ_SDR50
#else
#define BOARD_MAX_SDMMC_FREQ SDMMC_FREQ_HIGHSPEED
#endif
#endif

namespace fs {

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