how to read memory card hex file data without using FATFs lib

 Not sure what you mean with "FATFs lib". But if I understand you correct, you read a file from a medium formatted with the FAT file system? If you want you can of course implement the file system access logic your own in the most specialized and resource limited way for your application. If this is too much work for you, did you also have already a look at our MDK Middleware and the File System library part of it: www.keil.com/.../fs_resource_requirements.html

 Not sure what you mean with "FATFs lib". But if I understand you correct, you read a file from a medium formatted with the FAT file system? If you want you can of course implement the file system access logic your own in the most specialized and resource limited way for your application. If this is too much work for you, did you also have already a look at our MDK Middleware and the File System library part of it: www.keil.com/.../fs_resource_requirements.html