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fix(sdmmc): Fix iomux pin initialization #11998

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Merged
merged 1 commit into from
Nov 7, 2025
+12 −10
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fix(sdmmc): Fix iomux pin initialization #11998

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22 changes: 12 additions & 10 deletions libraries/SD_MMC/src/SD_MMC.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -228,17 +228,19 @@ bool SDMMCFS::begin(const char *mountpoint, bool mode1bit, bool format_if_mount_
#if defined(CONFIG_IDF_TARGET_ESP32P4) && defined(BOARD_SDMMC_SLOT) && (BOARD_SDMMC_SLOT == 0)
host.slot = SDMMC_HOST_SLOT_0;
// reconfigure slot_config to remove all pins in order to use IO_MUX
// Use 0 instead of GPIO_NUM_NC (-1) because ESP-IDF's s_check_pin_not_set()
// function uses !pin which doesn't work correctly with -1 (GPIO_NUM_NC)
slot_config = sdmmc_slot_config_t{
.clk = GPIO_NUM_NC,
.cmd = GPIO_NUM_NC,
.d0 = GPIO_NUM_NC,
.d1 = GPIO_NUM_NC,
.d2 = GPIO_NUM_NC,
.d3 = GPIO_NUM_NC,
.d4 = GPIO_NUM_NC,
.d5 = GPIO_NUM_NC,
.d6 = GPIO_NUM_NC,
.d7 = GPIO_NUM_NC,
.clk = GPIO_NUM_0,
.cmd = GPIO_NUM_0,
.d0 = GPIO_NUM_0,
.d1 = GPIO_NUM_0,
.d2 = GPIO_NUM_0,
.d3 = GPIO_NUM_0,
.d4 = GPIO_NUM_0,
.d5 = GPIO_NUM_0,
.d6 = GPIO_NUM_0,
.d7 = GPIO_NUM_0,
.cd = SDMMC_SLOT_NO_CD,
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@me-no-dev me-no-dev Nov 7, 2025

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I suggest you report this to IDF team, as it seems this is not the proper way things should be. There is no reason why IO0 can't be used

.wp = SDMMC_SLOT_NO_WP,
.width = 4,
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