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elephant2009
Joined: 04 Aug 2014
Posts: 7
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| Unable to create text file on sd card |
 Posted: Sat Oct 04, 2014 10:21 am |
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Hi friends !
I would like to create a text file (ie "hello.txt") on my 1GB SD memory card, using a dspic33EP MCU.
I have used the corrected drivers by mr andrewg (fat.c and mmcsd.c).
I was able to init the card and i get the following message ("MMC/SDC Found").
However, It seems that the 'fatopen' and 'mk_file' does not create any file.
And Stream value is always equal to zero: "Stream = 0"
Here is my main code:
| Code: |
#include <33EP512MU810.h>
#device PASS_STRINGS=IN_RAM
#FUSES NOWDT //No Watch Dog Timer
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOJTAG //JTAG disabled
#device ICSP=1
#use delay(clock=106MHz,crystal=8MHz)
#include <string.h>
#include <flex_lcd_16x2.c>
#use rs232(baud=9600, xmit=PIN_C2, rcv=PIN_C3)
#use fast_io(c)
#define MMCSD_PIN_SCL PIN_G6 //o
#define MMCSD_PIN_SDI PIN_G7 //i
#define MMCSD_PIN_SDO PIN_G8 //o
#define MMCSD_PIN_SELECT PIN_G9 //o
#include "mmcsd2.c"
#include "fat2.c"
void MakeFile(char *fileName)
{
FILE* stream = 0;
//char *permission="w";
lcd_gotoxy(1,1);
printf(lcd_putc, "\r\nMaking file ");
delay_ms(1000);
/*
if(mk_file(fileName) != GOODEC)
{
lcd_gotoxy(1,1);
printf(lcd_putc, "Error ");
delay_ms(1000);
return;
}
*/
fatopen(fileName, "w", stream);
fatclose(stream);
lcd_gotoxy(1,1);
printf(lcd_putc, "Stream = %d ", stream);
delay_ms(1000);
}
void main(void)
{
char fileN[]="hello.txt";
int resp;
lcd_init();
delay_ms(1000);
lcd_gotoxy(1,1);
printf(lcd_putc, "Initializing...");
delay_ms(1000);
if (mmcsd_init())
{
lcd_gotoxy(1,1);
printf(lcd_putc, "Could not init ");
lcd_gotoxy(1,2);
printf(lcd_putc, "the MMC/SD!!!!");
while(TRUE);
}
else
{
lcd_gotoxy(1,1);
printf(lcd_putc, "MMC/SDC Found ");
}
resp = fat_init();
MakeFile(fileN);
}
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And here are the modified drivers:
"FAT2.C":
https://drive.google.com/file/d/0Byt-Yg0sUAM5TFE3SlM1UUg4emc/view?usp=sharing
"MMCSD2.C"
https://drive.google.com/file/d/0Byt-Yg0sUAM5WDlrSTFsUlE5Z0U/view?usp=sharing
Any help would be appreciated. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Oct 04, 2014 11:45 am |
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Read through this 3-page thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=52738
It goes through a lot of the problems that you may have.
We were successful in read/write of a text file. Try to
do it the same way. |
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elephant2009
Joined: 04 Aug 2014
Posts: 7
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| Posted: Sat Oct 04, 2014 1:05 pm |
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Thank you mr PCM Programmer.
I will try to do the same way and keep you informed. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19515
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| Posted: Sun Oct 05, 2014 3:44 am |
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Try actually writing some data to the file. Even a single byte, before closing.
I remember some years ago, having a problem like this on a Linux distribution. It turned out that the directory entry was not actually committed to the disk, until a write occurred.
You are not printing the stream, till after you have closed it. I think the close, sets it to 'null'. |
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elephant2009
Joined: 04 Aug 2014
Posts: 7
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| Posted: Mon Oct 06, 2014 1:27 am |
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Thank you "Ttelmah" and "PCM Programmer" for your support.
1. 4x 10k Pull-up resistors have been used on data lines.
2. I have reinstalled CCS C Compiler (version 5.025) and used the provided "ex_fat.c" sample code.
3. In fact, when i run for the first time the "make hello.txt" command, the processor freeze and it didn't display
a result code.
| Code: |
ERROR INITIALIZING FAT
Formatting media (size=1048576): OK
Making file 'hello.txt':
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But when I reset and re-started the Ex_fat program, i get the following error message:
| Code: |
ERROR INITIALIZING FAT
Formatting media (size=1048576): OK
Making file 'hello.txt'
Error creating file
|
| Ttelmah wrote: | Try actually writing some data to the file. Even a single byte, before closing.
I remember some years ago, having a problem like this on a Linux distribution. It turned out that the directory entry was not actually committed to the disk, until a write occurred.
You are not printing the stream, till after you have closed it. I think the close, sets it to 'null'. |
I have also pre-formatted my sd card using both fat16 and fat32 filesystems, and added some data before running test program, but again nothing happens.
Unfortunately, i still can not commit any format/write operation to my 1GB SD Card.
Whether the sd card is inserted or not, i always get the following error messages (when i press reset button):
| Code: |
ERROR INITIALIZING FAT
Formatting media (size=1048576): OK
Making file 'hello.txt'
Error creating file
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In fact if the card is plugged in, I get the GOODEC response at a rapid rate. When I un-plug the card, the response occurs more slowly.
I have also tried to use andrewg's and Douglas Kennedy's fixes
http://www.ccsinfo.com/forum/viewtopic.php?t=51163&start=12
http://www.ccsinfo.com/forum/viewtopic.php?t=43417
http://www.ccsinfo.com/forum/viewtopic.php?t=43402
I only want to create a simple text file on the root directory.
I am very confused, and i don't know from where to start...
This is my simplified main code again (based on the "ex_fat.c" sample code):
| Code: |
#include <33EP512MU810.h>
#device PASS_STRINGS=IN_RAM
#FUSES NOWDT //No Watch Dog Timer
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOJTAG //JTAG disabled
#device ICSP=1
#use delay(clock=106MHz,crystal=8MHz)
#include <string.h>
#include <flex_lcd_16x2.c>
#use rs232(baud=9600, xmit=PIN_C2, rcv=PIN_C3)
#use fast_io(c)
#define MMCSD_PIN_SCL PIN_G6 //o
#define MMCSD_PIN_SDI PIN_G7 //i
#define MMCSD_PIN_SDO PIN_G8 //o
#define MMCSD_PIN_SELECT PIN_G9 //o
#include <stdlib.h> // for atoi32
#include <mmcsd.c>
//FAT library.
#include <fat.c>
void main(void)
{
lcd_init();
delay_ms(1000);
int i; // pointer to the buffer
// initialize the FAT
// keep in mind that this will automagically initialize the media
i = fat_init();
if (i)
printf(lcd_putc, "ERROR INITIALIZING FAT");
FormatMedia("1048576");
delay_ms(1000);
char opt_buffer[255];
strcpy(opt_buffer,"hello.txt");
MakeFile(opt_buffer);
}
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And Here is the schematic:
Pin Mapping:
----------------
SD --- DSPIC
----------------
SS2 --> G9
SDI2 --> G7
SDO2 --> G8
SCK2 --> G6
VDD --> 3.3V
Could you please provide again the final fixes of mmcsd and fat drivers.
A 10-lines working code (to start with) would be also much appreciated  |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Oct 06, 2014 12:04 pm |
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Your code is doing things substantially different than ex_fat.
You're declaring variables in mid-code. Ex_fat declares them at the
top of main(). Ex_fat makes a big deal about the current working
directory. They have this whole section which you have ignored:
| Quote: | /
/if option1 starts with a '/', that means the file in the option includes
//the full path to the file. if the file doesn't start with a '/', the
//current working directory must be added.
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You should first try to make it work with Ex_fat.
Run through the numbered sequence that I do in this post
http://www.ccsinfo.com/forum/viewtopic.php?t=52738&start=27
and show us the output on the terminal window, just as I do in that post. |
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