Some SD/MMC breakout boards don't support 4-bit bus mode. This adds a new macro MICROPY_HW_SDMMC_BUS_WIDTH that allows each board to define the width of the SD/MMC bus interface used on that board, defaulting to 4 bits.
Some SD/MMC breakout boards don't support 4-bit bus mode. This adds a new macro MICROPY_HW_SDMMC_BUS_WIDTH that allows each board to define the width of the SD/MMC bus interface used on that board, defaulting to 4 bits.