topic Re: SD Card in LPCXpresso IDE

SD Card

lpcware — Wed, 15 Jun 2016 22:13:05 GMT

Content originally posted in LPCWare by rtos on Sat Jun 26 16:03:45 MST 2010
I need to write data to an SD card. I was thinking of getting this SD Card connector here: http://www.sparkfun.com/commerce/product_info.php?products_id=204

From what I've been researching, it seems that there are at least these two ways I can do this:
1) Write data directly to the card without a file system. This would not be readable by a PC.
2) Use a file system and write data to a file on the card. This would be readable by a PC. Is there a free File System that is FAT16 compatible?

In either case, is there any sample code for the 1343 for option 1 and/or 2?

Thanks.

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:05 GMT

Content originally posted in LPCWare by CodeRedSupport on Sun Jun 27 04:21:32 MST 2010
Here are a couple of LPC17 related things that you might want to look at - should be fairly simple to transfer over to LPC13...

[LIST]
[*]AN10916 FAT library EFSL and FatFs port on NXP LPC1700
[/LIST]
[INDENT]http://ics.nxp.com/support/documents/microcontrollers/
[/INDENT]
[LIST]
[*]Embedded Filesystems Library Example
[/LIST]
[INDENT]http://support.code-red-tech.com/CodeRedWiki/RDB1768cmsisExampleProjects
[/INDENT]Regards,
CodeRedSupport

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:06 GMT

Content originally posted in LPCWare by giamby3000 on Thu Nov 11 01:06:26 MST 2010
Good morning, RTOS!
Look at this document:

http://elm-chan.org/docs/mmc/mmc_e.html

If anyone of you has information about examples of code in order to use SD card with LPCXpresso and LPC1100 family, please contact me!

Thank you very much

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:07 GMT

Content originally posted in LPCWare by rtos on Mon Nov 22 20:11:33 MST 2010
This is a really great link. Thanks!

Quote: giamby3000
Good morning, RTOS!
Look at this document:

http://elm-chan.org/docs/mmc/mmc_e.html

If anyone of you has information about examples of code in order to use SD card with LPCXpresso and LPC1100 family, please contact me!

Thank you very much

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:07 GMT

Content originally posted in LPCWare by cfb on Mon Nov 22 23:13:21 MST 2010

Quote: rtos
1) Write data directly to the card without a file system. This would not be readable by a PC.

You CAN write software to use a PC to access data on a card which doesn't have a file system. There is an outline of some Delphi code and other URLs leading to C code in this discussion:

https://forums.embarcadero.com/thread.jspa?messageID=150471

Your SDCard code on the LPCXpresso can then be as small and as simple as possible with all the hard work being done on the PC.

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:08 GMT

Content originally posted in LPCWare by NXP_USA on Wed Nov 24 16:01:28 MST 2010

If you purchase the Embedded Artists baseboard, it includes an SD card socket. If you register the board on EA's website, you will get access to a code library which includes a FAT filesystem to read and write to the SD card.

http://www.embeddedartists.com/products/lpcxpresso/xpr_base.php

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:08 GMT

Content originally posted in LPCWare by rompacz on Wed May 18 03:26:02 MST 2011
I have an EaBaseBoard with LPC1769 and I need to write an application which will write a file on SD card.
Example provided with the board is very simple and it doesn't operate on files.
Can you help me to extend this example to write/read a file?

simon

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:09 GMT

Content originally posted in LPCWare by giamby3000 on Tue May 24 03:16:34 MST 2011

Quote: rompacz
I have an EaBaseBoard with LPC1769 and I need to write an application which will write a file on SD card.
Example provided with the board is very simple and it doesn't operate on files.
Can you help me to extend this example to write/read a file?

simon

I will start the same task next weeks with 1768 Board and I will try to write an SD card. You must have a file system on it.

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:10 GMT

Content originally posted in LPCWare by james on Thu Jan 05 03:12:29 MST 2012
Hi there, I am trying to save data logged data into sdcard and/or read sdcard value to control leds.

i tried to extend the efsl_demo from red_code_examples but i cant seems to write anything. here is my code:

{
    int8_t res;

    MESSAGE("\nRDB1768 EFSL / microSD card Demonstration\n");
    MESSAGE("=========================================\n");

    MESSAGE("CARD init...");
    if ( ( res = efs_init( &efs, 0 ) ) != 0 ) {
        MESSAGE("failed with %i\n",res);
    }
    else {
        MESSAGE("ok\n");
        MESSAGE("Directory of 'root':\n");
        ls_openDir( &list, &(efs.myFs) , "/");
        while ( ls_getNext( &list ) == 0 ) {
            list.currentEntry.FileName
[LIST_MAXLENFILENAME-1] = '\0';
            MESSAGE( "%s ( %li bytes )\n" ,
                list.currentEntry.FileName,
                list.currentEntry.FileSize ) ;
        }
    }

// This part is provided by red_code_examples and is working perfectly

Here is my code for writing a file

        euint8 *buffer = "1234567" ;
        euint16 e = 0;
        euint8 buffer1[512] ;
        euint16 f ;
        File filew, filer;

        /*Open file for writing */
        if (file_fopen (&filew , &efs.myFs , "read3.txt" , 'a' ) !=0){
        MESSAGE("Could not open file for writing. \n", res ) ;
        return -1;
        }
        else
        MESSAGE("File opened for writing. \n", res) ;

        /* Write buffer to file */
//        strcpy((char*)buf, "Martin hat's angehaengt\n");
        int ll;
        if ( (file_write (&filew , 512 , *buffer )) == strlen( buffer ) )
//        if ( (file_write( &filew, strlen((char*)buf), buf )) == strlen((char*)buf))
        MESSAGE("File written . %d %d \n", file_write, strlen(buffer));
        else
        MESSAGE("Could not write file. \n", res);
        fclose (&filew);

it returns "file written"
It creates a file call "read3.txt" but it doesnt write any thing into it. the file is has 0bytes.
I copied it from a user manual found at efsl.be

I am using a rdb1768v2r4 board and a 2gb micro sd-card formatted to fat16 with 32kb allocation unit size.

Anyone who has used this before please kindly point out what i might have missed. Thank you :)

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:10 GMT

Content originally posted in LPCWare by Ex-Zero on Thu Jan 05 03:34:12 MST 2012
Create a valid buffer, your buffer is nonsense :eek:

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:11 GMT

Content originally posted in LPCWare by james on Thu Jan 05 22:26:58 MST 2012
Oh my, i spend too much time copying and forgotten to use my brain.

Thanks to rob :), its working fine now.

i replaced the write line to :

if(file_write(&file_w,strlen((eint8 *)buffer),buffer) == strlen((eint8 *)buffer))

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:12 GMT

Content originally posted in LPCWare by james on Fri Jan 06 02:42:58 MST 2012
I have notice that the function: euint32 file_write(File *file, euint32 size,euint8 *buf)
means that buf has to be a char, how can i write binary into the sd card? Could someone provide a hint/trick to do this?

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:12 GMT

Content originally posted in LPCWare by Ex-Zero on Fri Jan 06 04:07:41 MST 2012
euint8 *buf is a pointer to a buffer (* = pointer) :eek:

This read/write functions use pointers to buffer :rolleyes:

As in the sample you have started with, you could use a buffer like:

char buffer[512];

This is a real array of 512 bytes

And you can point to this buffer with your read/ write function.

Re: SD Card

lpcware — Wed, 15 Jun 2016 22:13:13 GMT

Content originally posted in LPCWare by james on Sun Jan 08 18:27:58 MST 2012
Thanks for the suggestion, i got the buffer fixed, now i can write "strings" into the SD card. But how do i write binaries? for example if i want to write 8, i can convert the 8 to 1000, but sending "1000" would write "1000" in ASCII instead of just 1000.bin.

Could anyone point me how to write binaries in EFSL?

Opps solved, i just change the values to binary, edit and changed back

Re: SD Card

lpcware — Thu, 16 Jun 2016 15:29:18 GMT

Content originally posted in LPCWare by Rob65 on Thu Jan 05 13:03:30 MST 2012

Quote:
MESSAGE("File opened for writing. \n", res) ;

/* Write buffer to file */
// strcpy((char*)buf, "Martin hat's angehaengt\n");
int ll;
if ( (file_write (&filew , 512 , *buffer )) == strlen( buffer ) )

Quote:

What do you think the *buffer in file_write does ?
My C bible tells me this evaluates to one byte being the ASCII value of "M" :eek:

Rob