# SD card STM32f4 error **URL:** \ **Category:** MIDIbox NG\ **Tags:** ng, stem32f4, sd-card-error\ **Created:** [December 16, 2014, 7:42am UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754 "2014-12-16T07:42:43Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![GuitarNut67](https://forum.midibox.org/user_avatar/forum.midibox.org/guitarnut67/32/516_2.png) [@GuitarNut67](https://forum.midibox.org/u/GuitarNut67)\ **Post date:** [December 16, 2014, 7:42am UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754/1 "2014-12-16T07:42:43Z")
I may have messed up my STM32F4 board.  I accidentally plugged the 74HCT541 in backwards while trying to power it up for the first time.  No lights came on.   I replaced both chips on the  core module and got the boot loader and LCD working.  I installed Midibox NG 1.032 but my SD card fails. ☹   From MIOS Studio 2.4.6 (here are the details) [319531.507] sdcard [319531.499] SD Card Informations [319531.500] ==================== [319531.500] ERROR: Reading CID failed with status -256! [319531.500] ERROR: Reading CSD failed with status -256! [319531.500]  [319531.500] Reading Root Directory [319531.500] ====================== [319531.500] SD Card: not connected [319531.500] Failed to open root directory - error status: 12 [319531.500] done.     I tried two 8 gig sd cards (one Ultra) format FAT 32. ==========================   I checked continuity between the solder pads of the sd card before assembly nothing seemed to be causing a short circuit.   Is there a way to trouble shoot SDCard or Connector and the STM32F4 board ?   I couldn’t locate error status codes while searching the forum.   Thanks,    A confused GuitarNut ---
**Author:** ![T.K](https://forum.midibox.org/user_avatar/forum.midibox.org/t.k/32/7_2.png) [@T.K](https://forum.midibox.org/u/T.K)\ **Post date:** [December 16, 2014, 3:48pm UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754/2 "2014-12-16T15:48:24Z")
I’ve never seen this before! It seems that communication with the SD Card is working, but it doesn’t behave like a common SD Card. E.g. the CID contains some manufacturer informations, and the CSD some implementation parameters - they can be retrieved.   Would it be possible to try out a different SD Card from another manufacturer? Can also be a very cheap one. \<= 4 GB cards should be preferred,    Best Regards, Thorsten. ---
**Author:** ![GuitarNut67](https://forum.midibox.org/user_avatar/forum.midibox.org/guitarnut67/32/516_2.png) [@GuitarNut67](https://forum.midibox.org/u/GuitarNut67)\ **Post date:** [December 16, 2014, 7:26pm UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754/3 "2014-12-16T19:26:05Z")
Thank you, for the quick response. Yes, I will try a 4GB card to see if that makes it happy.   I did notice that the same errors occur when there is no SD card in the slot.   I removed the STM32F4 board from the socket and made a continuity test for all pins on the SD card and where they arrive at J16. I notice some crossed lines in my test, I’m including a drawing showing my results. \<\_\_\_base\_url\_\_\_\>/gallery/image/2694-sd-card-trouble/?do=embed   In my continuity test, pin 9 & 6 of the SD card bridge both RC1 & RC2, while pin 3 joins them at RC1 of J16. Is this a proper connection?   Thanks  ---
**Author:** ![T.K](https://forum.midibox.org/user_avatar/forum.midibox.org/t.k/32/7_2.png) [@T.K](https://forum.midibox.org/u/T.K)\ **Post date:** [December 16, 2014, 10:27pm UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754/4 "2014-12-16T22:27:57Z")
Interesting, I didn’t know this failure more yet.   Yes, if course - the two RC pins should be separated, there shouldn’t be a short between the two pins.   You can doublecheck this by removing the STM32F4DISCOVERY board. If there is still a short, check the appr. solder joints   Best Regards, Thorsten. ---
**Author:** ![GuitarNut67](https://forum.midibox.org/user_avatar/forum.midibox.org/guitarnut67/32/516_2.png) [@GuitarNut67](https://forum.midibox.org/u/GuitarNut67)\ **Post date:** [December 18, 2014, 8:03am UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754/5 "2014-12-18T08:03:29Z")
Ok,  I tried a 2 gig SD card with no improvement. :no:   Triple checked the solder connections on the board and SD card socket these seem fine and, I was **in** correct in my earlier post (I confused the orientation of J16 making me think I had a short between RC1 & RC2 it was actually Vs & Vs).    Do you think I may have damaged the STM32F4 board by powering it up with an incorrectly oriented 74HCT541 chip?   I’m considering purchasing another STM32F4 for comparison.   Thanks  ---
**Author:** ![GuitarNut67](https://forum.midibox.org/user_avatar/forum.midibox.org/guitarnut67/32/516_2.png) [@GuitarNut67](https://forum.midibox.org/u/GuitarNut67)\ **Post date:** [December 23, 2014, 4:12am UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754/6 "2014-12-23T04:12:30Z")
Ok, Good news   I ordered more STM32F4 boards and they all react the same with my Core breakout board. I didn’t fry the processor board. 🙂   Bad news, Still have a non-functioning SD interface.   I guess I need to remove the current SD Connector and start over. ---
**Author:** ![GuitarNut67](https://forum.midibox.org/user_avatar/forum.midibox.org/guitarnut67/32/516_2.png) [@GuitarNut67](https://forum.midibox.org/u/GuitarNut67)\ **Post date:** [January 19, 2015, 3:48am UTC](https://forum.midibox.org/t/sd-card-stm32f4-error/18754/7 "2015-01-19T03:48:14Z")
OK, Finally completed a second Breakout board, this time it worked!  😄   Must have messed it up while building it.    Please disregard the graphic earlier in the thread.   I incorrectly labeled the connector. I wouldn’t want to confuse anyone.   If TK could delete this thread that would be OK with me.