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I have interfaced 256Mb sdcard with stm32f051 using FATFS driver, find_volume() function is giving FR_NO_FILESYSTEM response because ld_word(fs->win + BS_55AA) != 0xAA55. Please give me some solution for this issue.
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My statement refers to MDK 5.28a, which today is our latest release.
The Pack Installer of MDK offers for many ST devices demonstrating FileSystem example projects (i.e."File System Demo" for STM32F4):
http://www2.keil.com/mdk5/packinstaller/
Compare with one of these projects your implementation.
See also our "File System Component Documentation" at:
https://www.keil.com/pack/doc/mw/FileSystem/html/index.html
Note - File System access as part of the MDK-Middleware requires either MDK-Pro or MDK-Plus:
http://www2.keil.com/mdk5/middleware
http://www2.keil.com/mdk5/selector