SDIO sd 4 bit bus, stm32f103 problem

[mn]

Posted on June 30, 2014 at 14:28The original post was too long to process during our migration. Please click on the attachment to read the original post.

[mn]

Posted on July 05, 2014 at 02:20

I check Clive1 SDIO&FATFS code on Discovery F4 board and compare CMD

behavior on STM32F407 and STM32F103 with oscilloscope.  on STM32F103 problem is when Host send CMD and HiZ CMD line, CMD line get Pull Down!! what is wrong with my configuration that CMD line get pull down

Instead of

HiZ?

[Tesla DeLorean]

Posted on July 05, 2014 at 12:38

Sorry, not so much practical experience with SDIO on the F1 parts. Seem to remember it working on an STM3210E-EVAL board, and perhaps another board in SPI mode. Had to add code to support SDHC and >2GB as I recall.

The only other thing I'd note is that all the board I've used have 10K-47K pull-ups externally on the SDIO pins (except CLK) close to the card socket.