Read data from sd card

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Read data from sd card

Topic last updated 24 Oct 2016, by jayendra mishra. 4 replies

aditya yembuluru

# 20 Jul 2011

Is it possible to read the stored data from the SDcard.If it is possible please give me an example. Thanking you

Dirck Sowada

# 20 Jul 2011

Have a look in the cookbook ;-) There are some examples ....

Regards kokisan

Gert van der Knokke

# 20 Jul 2011

I have used the SDHC filesystem with succes already:

http://mbed.org/users/xxll/programs/SDHCFileSystem/5zdtq/docs/main_8cpp_source.html

Gert van der Knokke

# 21 Jul 2011

for reading just replace the "w" in the fopen command with "r" and use fgetc or fgets to read a single byte or a string from the file:

      // example of reading a file one byte at a time
      // and display it in hex format on the terminal

      unsigned char c;                          // a single byte buffer

      FILE *fp = fopen("/sd/myfile.txt", "r");  // open the file in 'read' mode

      while (!feof(fp)){                        // while not end of file
           c=fgetc(fp);                         // get a character/byte from the file
           printf("Read from file %02x\n\r",c); // and show it in hex format
      }
      fclose(fp);                               // close the file

If you want to read more data at once use fgets instead.

jayendra mishra

# 24 Oct 2016

how can I save and read integer values from sdcard. Do I have to write fgetd?

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