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Small SD card question

 
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Small SD card question
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JensenBreck
Grand Manitou

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Message Small SD card question Répondre en citant
Hello, I have a generic question to reading/writing from/to SD/MMC cards with mikroPascal. 


There exists a library which works fine with FAT16 formatted cards. Now I tried to take one of my older 16MB CD cards. In LINUX I made a partition of type 4 (FAT16 <32MB) on it and formatted it with "mkfs.msdos -f 2 -F 16 -n FAT16 /dev/sdf1", and the result is a FAT16 which can be read and written without problems in LINUX. I also tried to leave -f 2 away to create only one FAT instead of two. No difference. 


From the PIC, I was able once to write a file to this card, I also could read the file on LINUX. But since this one lucky event, the card cannot be detected any more by mikroPascal, the init_fat16_,,, function always returns the error number 255 (No card detected). 


Because an other card (HighSpeed, 512MB, FAT16) works without problems on the same device, and because I am able to read/write both cards (the 16MB one and the 512MB one) without any problems in LINUX, I have the opinion that the small card may have a different problem instead of the FAT16 format, i.e. a timing problem (it is old? 


Because it makes no sense to use 512MB cards for only writing one file with ~2kB on it, I will be happy to receive some ideas on what I can try to get the 16MB cards working. I use a 18F2680 at 11,0592 MHz, everything running on 3,3V. 




Thanks for any useful information.





I didn't find the right solution from the Internet.
References
https://forum.mikroe.com/viewtopic.php?t=9747
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