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kalambraka
Joined: 24 Jan 2012
Posts: 4
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| SD fat32 write problem |
 Posted: Tue Jan 24, 2012 10:37 pm |
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Hi guys!
I'm interfacing a PIC18F2455 with a SD card using the mmc_spi_fat32.c library.
I send data coming from sensors to the card using the fwrite function, and then I can see it (so, it's seems that everything is OK), but I realize that it only writes the half of my data into the card. If I send 4 datas using fwrite I can only see 2 in the card. If I send 8, I see 4...
I write this test program sending the data in a loop:
| Code: |
#include <18F2455.h>
#use delay(clock=4000000)
#include "mmc_spi_fat32.h"
#include <usb_cdc.h>
#include <string.h>
#include "mmc_spi_fat32.c"
#ZERO_RAM
void main(){
delay_ms(1000);
char file,gfilename[5];
int t[3];
int h[3];
int p[3];
int l=3,x=1;
int mesura=0;
usb_cdc_init();
usb_init();
while(!usb_cdc_connected()) {} // Espera fins detectar una transmisió USB
if (usb_enumerated()){ // El PC reconeix el dispositiu
usb_task();
delay_ms(1000);
MMCInit() == MMC_OK;
while(MMCInit() != MMC_OK){ //espera inicialitzacio
printf(usb_cdc_putc,"MMC init FAIL!!!!!\r\n");
printf(usb_cdc_putc,"Try again...\r\n");
delay_ms(100);
MMCInit() == MMC_OK;
}
printf(usb_cdc_putc,"MMC init OK!!!!!\r\n");
delay_ms(1000);
InitFAT();
printf(usb_cdc_putc,"FAT init OK!!!!!\r\n");
delay_ms(1000);
strcpy(gfilename,"D.LOG");
file = fopen(gfilename,'w'); // open EVENTS.LOG for append ////
if (file & MMC_ERROR) ////
{ ////
printf(usb_cdc_putc,"Couldn't open file!\r\n"); ////
if(file == MMC_NO_CARD_INSERTED) ////
printf(usb_cdc_putc,"Please, insert MMC!"); ////
else if(file == MMC_MAX_FILES_REACHED) ////
printf(usb_cdc_putc,"ops.. =)"); ////
} ////
else ////
{
//#ZERO_RAM
DELAY_MS(1000);
t[0]=02;
t[1]=02;
t[2]=02;
h[0]=03;
h[1]=03;
h[2]=03;
p[0]=04;
p[1]=04;
p[2]=04;
while(mesura<4){
printf(usb_cdc_putc,"Start writing...\r\n");
fwrite(t,l,file);
delay_ms(10);
fwrite(h,l,file);
delay_ms(10);
fwrite(p,l,file);
delay_ms(10);
delay_ms(10);
fclose(file);
delay_ms(10);
delay_ms(100);
printf(usb_cdc_putc,"Write complete...");
mesura=mesura+1;
}
delay_ms(100);
}
}
}
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In the SD card I should see:
222333444
222333444
222333444
222333444
but I always see only half:
222333444
222333444
Can anyone help me?
Thank you. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19457
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| Posted: Wed Jan 25, 2012 2:23 am |
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I'm surprised you see half.
Don't you think the fact that you have closed the file after writing the first 9 bytes, and don't open it again, might have something to do with it.
Best Wishes |
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kalambraka
Joined: 24 Jan 2012
Posts: 4
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| Posted: Wed Jan 25, 2012 11:55 am |
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Thanks for the reply.
If I open again the file inside the loop, then I see nothing in the SD card...
It's really strange...
The only solution that I found is sending data with zeros in another loop after this... I think that maybe it's something related to cleaning the buffer afer writing again... |
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