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Is there any sample source code about R/W operations to SD?

 
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theasus



Joined: 31 May 2009
Posts: 79

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Is there any sample source code about R/W operations to SD?
PostPosted: Wed Dec 16, 2009 11:13 am     Reply with quote
Is there any sample source code about Read/Write operations to SD/MMC card?


Thanks.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Dec 16, 2009 12:19 pm     Reply with quote
Get a text search engine (or use the F3 key in Windows) and run it on
the CCS directories. Search for "SD". Set the file extensions to *.h
and *.c, and you will quickly see all files that have SD in them. Examples:
Quote:

c:\program files\picc\examples\ex_mmcsd.c
c:\program files\picc\examples\ex_fat.c

Also look in the CCS code library forum.
theasus



Joined: 31 May 2009
Posts: 79

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PostPosted: Sun Dec 20, 2009 6:08 am     Reply with quote
I couldn't understand exactly this source code. Where is Microcontroller writing information to text file or something like that? And what is the basic function of Read write operation? I want to write or read something in MMC from a text file. How can I do it?
I have showed the points that I couldn't understand;
Code:

do {
      do {
         printf("\r\nRead or Write: ");
         cmd=getc();
         cmd=toupper(cmd);
         putc(cmd);
      } while ( (cmd!='R') && (cmd!='W') );

      printf("\n\rLocation: ");        ////How can I determine the location?

      address = gethex();                         
      address = (address<<8)+gethex();    ////What does this code work???

      if(cmd=='R')
      { 
         mmcsd_read_byte(address, &value);
         printf("\r\nValue: %X\r\n", value);
      }

      if(cmd=='W') {
         printf("\r\nNew value: ");
         value = gethex();     //////Is "gethex()" our value to write?
         printf("\n\r");
         mmcsd_write_byte(address, value);  //////Where is the address?
         mmcsd_flush_buffer();
      }
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Dec 20, 2009 2:54 pm     Reply with quote
This code is getting Hexadecimal (0 to F) characters that you type in
from a terminal window on your PC (such as HyperTerminal or TeraTerm).

The user (you) must type in the hex numbers (and also 'W' or' R') when prompted by the program.
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