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SD Card FAT CCS
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hemasc_



Joined: 01 Aug 2012
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SD Card FAT CCS
PostPosted: Thu Sep 12, 2013 2:52 pm     Reply with quote

Guys, I'm trying to write data to an SD Card (FAT).
I tried to use the library of CCS but no success.

Could anyone help me which way to go?
temtronic



Joined: 01 Jul 2010
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PostPosted: Thu Sep 12, 2013 3:11 pm     Reply with quote

99% of all 'problems' are with hardware !
You either need a 3V ( LF series) PIC dirctly connected to the SD card OR logic level translator chip between 5V PIC and 3V SD card.

Use the 'search' feature here and you'll get 100s of hits about how to interface PICs with SD cards...

If I knew I'd get paid, I'd write a book about this one subject.....

hth
jay
hemasc_



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PostPosted: Thu Sep 12, 2013 3:28 pm     Reply with quote

My hardware was tested. It´s okay. I make a simple communication by SPI and it´s okay.
But the problem is FAT format.
I tried to use the library of CCS, but not compiled.
I have not found here topics that FAT library was used correctly...
temtronic



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PostPosted: Thu Sep 12, 2013 6:06 pm     Reply with quote

obvious question...

what size is the SD card ?
hemasc_



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PostPosted: Thu Sep 12, 2013 7:29 pm     Reply with quote

temtronic, what can be obvious for you, can not be for others...

my SD card is 2G, but I can't compile the FAT library
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Thu Sep 12, 2013 9:30 pm     Reply with quote

1. What's your CCS compiler version ?

2. What's your PIC ?

3. Post a list of the CCS files that you are trying to compile.

3. Post the compiler errors that you get. If there are many of them,
then just post the first 10 errors.
temtronic



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PostPosted: Fri Sep 13, 2013 5:17 am     Reply with quote

I asked about the size, as the library only runs on 2GB or smaller cards.Your reply to me, says you can't compile which is different than what I read in your OP.
As PCM P says, we need more 'data'.
Since you say the hardware is 'ok', then it's probably a simple miscoding issue.

jay
hemasc_



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PostPosted: Fri Sep 13, 2013 8:45 am     Reply with quote

PCM progammer:

1 - 4.120
2 - 18F87k90
3 - fat.h and mmcsd.h (I changed the extension to .h, both were .c)

4 -
fat.h" Line 607(26,27): Undefined identifier -- mmcsd_write_data
fat.h" Line 614(28,29): Undefined identifier -- mmcsd_read_data

temtronic:

I knew the size of the SD card that can be used with FAT
Ttelmah



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PostPosted: Fri Sep 13, 2013 9:10 am     Reply with quote

Change the extensions back to c. The files each 'use' the names of the other part as .c.

It is a matter of 'taste' using .h, or .c. The point is that these are compilable code, not just 'defines', so .c is perfectly correct as the extension for these. Most CCS examples, use .h for the files that just define things or link other stuff, and .c for actual code, _and are setup to compile this way_. mmcsd_write_data, and read_data, are defined in mmcsd.c. Which is 'where' fat.c looks for it.

If you change the extension, you will need to change every reference to the files as well.

Best Wishes
hemasc_



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PostPosted: Fri Sep 13, 2013 9:46 am     Reply with quote

I changed the extensions to .c and

fat.c" Line 607(26,27): Undefined identifier -- mmcsd_write_data
fat.c" Line 614(28,29): Undefined identifier -- mmcsd_read_data

when I changed to .h, I modified all references
PCM programmer



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PostPosted: Fri Sep 13, 2013 12:14 pm     Reply with quote

It compiled OK for me. First I did a text search to find which CCS
example files use those driver files and I found Ex_Fat.c is the file.

I installed PCH vs. 4.120 and used the Project Wizard in MPLAB vs. 8.91
to make a project called Ex_Fat in the CCS \Examples directory. I added
the source file Ex_Fat.c to the project and made sure MPLAB was set to
compile in Release mode.

I edited the first few lines of Ex_Fat.c to change the #include for the PIC
and the #fuses so they would work with the 18F87K90:
Code:

//#include <18F67J60.h>
#include <18F87K90.h>    // *** Changed PIC
#device PASS_STRINGS = IN_RAM
//#fuses NOWDT, HS, NOPROTECT
#fuses NOWDT, HSH, NOPROTECT   // *** Changed oscillator fuse
#use delay(clock=25M)


Then I clicked the compile button and it compiled without errors:
Quote:

Executing: "C:\Program Files\PICC\Ccsc.exe" +FH "ex_fat.c" +DF +LN -T +A +M -Z +Y=9 +EA #__18F87K90=TRUE
>>> Warning 202 "ex_fat.c" Line 28(5,8): Variable never used: rs232_errors
Memory usage: ROM=21% RAM=36% - 47%
0 Errors, 1 Warnings.
Loaded C:\Program Files\PICC\Examples\ex_fat.cof.
BUILD SUCCEEDED: Fri Sep 13 11:06:38 2013

From the .LST file:
Code:

CCS PCH C Compiler, Version 4.120, xxxx        13-Sep-13 11:06

               Filename: C:\Program Files\PICC\Examples\ex_fat.lst

               ROM used: 27778 bytes (21%)
                         Largest free fragment is 65536
               RAM used: 1381 (36%) at main() level
                         1806 (47%) worst case
               Stack:    17 locations
ckielstra



Joined: 18 Mar 2004
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PostPosted: Fri Sep 13, 2013 12:20 pm     Reply with quote

Sigh...
Why did you start to modify the CCS supplied library code? It is supposed to work the way it is.
I hope you have learned an important lesson: don't fix anything if it ain't broken!!!


Go back to the original situation. Perhaps install the CCS compiler again to make 100% sure you have not modified anything.

The error you show is because the function mmcsd_write_data() can not be found. If you look into the file fat.c you will see it is not there, that's because it is in the file mmcsd.c. To fix the error you will have to include this file as well.

All these problems would have been avoided when you would have started to use the example program ex_fat.c. My suggestion is that you start using this program now and only when things are working you make the next step to create your own program.

Just a few more tips to help you:
- Don't use the format function from the CCS fat driver. It only implements a limited format and several people reported problems with it.
- The CCS FAT driver can not handle cards that are formatted with multiple partitions. Once a card is formatted with multiple partitions this is hard to remove again. Even brand new cards often come pre-formatted and might be wrong for this library. Best is to format your card in a photo camera.
- The CCS library is known to have a few bugs. Have a look in the Code Library section of this forum to find the work arounds.

Edit: I see PCM posted an answer while I was typing this but decided to have my answer here as well.
hemasc_



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PostPosted: Fri Sep 13, 2013 12:46 pm     Reply with quote

thanks PCM programmer, I compiled
I will make tests and then post the results here

ckielstra, I learned my lesson
hemasc_



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PostPosted: Fri Sep 20, 2013 12:41 pm     Reply with quote

I was testing new hardware and noticed something very strange

when I run output_high(MMCSD_PIN_SELECT); //port D7 (18F87k90).... the voltage was 3.3 V for 0.3V with or without the SD card

when I run output_low(MMCSD_PIN_SELECT); //port D7 (18F87k90).... the voltage was 0.3 V for 3,8V with SD Card and for 3,2V without the SD card

I dont found short circuit

my electrical schematic
http://dl.dropboxusercontent.com/u/3490869/c%C3%B3digos/Sd%20Card/esquema/esquema.png
ckielstra



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PostPosted: Fri Sep 20, 2013 2:30 pm     Reply with quote

First answer in this thread was:
temtronic wrote:
99% of all 'problems' are with hardware !
You either need a 3V ( LF series) PIC dirctly connected to the SD card OR logic level translator chip between 5V PIC and 3V SD card.
Your answer:
hemasc_ wrote:
My hardware was tested. It´s okay.
Now it turns out you are using a 5V processor and voltage divider... Rolling Eyes

I'm out.
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