Using the SD card on the WunderboardECE152

Overview What is a file system? How can I open files? How do I read and write from files? What about 'error codes'? Coding example

What is a file system? Memory is just a long list of locations File systems organize memory File systems are created based on the

memory

uint8_t initializeFAT(FATFS* fs)

How can I open files? Files are opened for reading or writing Files can be created, overwritten, or

appended to

f_open(&log, "/log.txt", FA_WRITE | FA_CREATE_ALWAYS)

How do I write to files? You write data as bytes When writing, tell the function how many bytes

f_write (FIL*, const void*, UINT, UINT*)

FIL - File 'handle' const void* - data to be written UINT - number of bytes to write UINT* - number of bytes written

What about 'error codes'?switch (err) { case ERR_FMOUNT: sendStringUART("ERROR: Could not mount SD\r\n"); break; case ERR_NODISK: sendStringUART("ERROR: No SDC/MMC present\r\n"); break; case ERR_NOINIT: sendStringUART("ERROR: Unable to initialize FAT.\r\n"); break;

...etc...

Coding example

Things to Remember Always double check the error codes When in doubt, ask questions.