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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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20 changes: 20 additions & 0 deletions libraries/SD_MMC/examples/SDMMC_Test/SDMMC_Test.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -211,6 +211,25 @@ void testFileIO(fs::FS &fs, const char *path) {
file.close();
}

void testRawIO(uint32_t sectors, uint8_t sequential) {
uint32_t readSect = 0;
uint32_t startTime = millis();
uint8_t* buf = (uint8_t*)heap_caps_malloc(SD_MMC.sectorSize(), MALLOC_CAP_DMA);
for (uint32_t x=0; x<sectors; x++) {
if (! SD_MMC.readRAW(buf, readSect)) {
log_e("Unable to read sector %lu\n", readSect);
free(buf);
return;
}
readSect = sequential ? readSect + 1 : random(SD_MMC.numSectors()-1);
}
uint32_t passed = millis() - startTime;
uint32_t rate = sectors * SD_MMC.sectorSize() / passed;
Serial.printf("%lu %s sectors read in %lu msec (%luKB/s)\n",
sectors, sequential ? "sequential" : "random", passed, rate);
free(buf);
}

void setup() {
Serial.begin(115200);
/*
Expand Down Expand Up @@ -262,6 +281,7 @@ void setup() {
renameFile(SD_MMC, "/hello.txt", "/foo.txt");
readFile(SD_MMC, "/foo.txt");
testFileIO(SD_MMC, "/test.txt");
testRawIO(2000, 1);
Serial.printf("Total space: %lluMB\n", SD_MMC.totalBytes() / (1024 * 1024));
Serial.printf("Used space: %lluMB\n", SD_MMC.usedBytes() / (1024 * 1024));
}
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9 changes: 9 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 +246,15 @@ bool SDMMCFS::begin(const char *mountpoint, bool mode1bit, bool format_if_mount_
.width = 4,
.flags = 0,
};
#ifdef SOC_SDMMC_UHS_I_SUPPORTED
if (sdmmc_frequency == SDMMC_FREQ_DDR50) {
host.flags |= SDMMC_HOST_FLAG_DDR;
slot_config.flags = SDMMC_SLOT_FLAG_UHS1;
}
if (sdmmc_frequency == SDMMC_FREQ_SDR50) {
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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Original file line number Diff line number Diff line change
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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