thanks for your hints.
@bobgoar: Thanks for your effort of extracting the info; I added the pullups on the SPIs, yet to no avail. (In an AVR breadboard environment with comparable wire lengths this SD card worked even without pullups, so I left them out in my first attempt). Regarding the LCD I did add power supply in the first place but I am no longer sure the display works all right.
@pavloven: This is an interesting one as well; I hadn't noticed there is off-chip capacitance on some pins. This was in a way my question regarding pull ups etc on GPIOs. Is it equivalent to assign miso to pin 1 to avoid unsoldering C13? Pin 1 appears to be a simple GPIO without additional circuitry. I tried this (using pin 1) in the meantime, did not solve the problem... All the other pins I am using are on plain GPIOs...
Any other idea? Thanks again,
It seems to lack FS_FAT_SupportLFN () function associated with a license from Microsoft for long filenames
Yes, you can use the other contact ( pin 1)
I checked your project, it work:
(my pins: P0.5=miso 0.4=mosi 0.6=sclk 0.7=CS )
SD Kingston 1GB -OK
SDHC QUMO 4GB -OK
microSD 1GB - ERROR
I hope you are using an external power supply 3.3V
thank you SO MUCH for your efforts! This was the solution. Unfortunately, for an emergency in my family I was unable to answer earlier. I just tried my project with a different (standard SD instead of micro SD) as you suggested and IT WORKS.
So thanks again and have a wonderful Christmas :-)