Ok, I have added a 100uF cap over the powerline as close as possible to the sd socket, but things still don’t work on my panda I. The Cobra is reading/writing the same sd cards just fine.
Is it possible to connect the SD card adapter to the Cobra in order to exclude a HW fault? If so, how should i connect this. The SD card adapter is home made like explained in the wiki [url]GHI Electronics – Where Hardware Meets Software
Just curious… Was the problem with certain SD cards not working ever resolved? We are having the same problem, and my searches through the forums have so far led to dead ends.
I have a Patriot 4GB SDHC card in an SD expansion card connected to a Panda. For whatever reason, the constructor for PersistentStorage throws an exception:
Just FYI, I tried running on a different Panda1 board with the same results (exception thrown in PersistentStorage constructor).
If you’d like, we can send you the whole setup. The Panda, SD Expansion card, and another SD card that doesn’t work (assuming we can get everything back when you are done with it).
There is a transistor on the SD exp that seems to be causing problems.
We connected the SD power directly to VCC without transistor and it worked fine…
We will send what we used back to you.