f_ Read function [easy to understand]

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f_read The function is declared as follows ： [cpp] view plain copy FRESULT f_read ( FIL* fp, /* [IN] File object */ void* buff, /* [OUT] Buffer to store read data */ UINT btr, /* [IN] Number of bytes to read */ UINT* br /* [OUT] Number of bytes read */ ); btr Is the amount of data the user wants to read ,br Is the amount of data actually read , So when it is judged that br==0 when , After reading the file .

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