Good afternoon everyone. Does anyone knows if the SD Card works on STM32F103ZET6 in 4-bit mode.

[Tesla DeLorean]

Yes, the SDIO peripheral/card can be negotiated up to 4-bit operation. Had this work on a couple of the F1 boards

[David Soares]

Do you know where I can find and example of this application or a step-by-step tutorial?

[Tesla DeLorean]

SPL

STM3210E-EVAL_FW_V2.1.0\Project\STM3210E-EVAL

STM3210E-EVAL_FW_V2.1.0\Utilities\STM32_EVAL\STM3210E_EVAL\stm3210e_eval_sdio_sd.c

HAL

STM32Cube_FW_F1_V1.8.3\Projects\STM3210E_EVAL\Applications\FatFs\FatFs_uSD\Src

STM32Cube_FW_F1_V1.8.3\Drivers\BSP\STM3210E_EVAL\stm3210e_eval_sd.c