SD CARD CCS C

[temtronic]

the 245 is a 3 volt device. While it can ACCEPT a 5 volt input, it CANNOT output 5 volts.

I have no idea why the 245 are on the PCB.

please post what module you have, and I'll try to find a real schematic of it.

[Ttelmah]

Yes. These are part of the LCD circuitry. _not_ level shifting for the SD,

If you look a the picture you posted of the module right at the start of the
thread, and enlarge this, you can see that the data connection to the SD
run directly across the board to the pin connector at the right of the board
they go nowhere near the 245 buffers.

As designed, the unit will work with something like a Arduino, since this
accepts +2.4v as high for SPI. However even on this it could well damage
the SD card, since the inputs to the SD will be overdriven. However it
cannot work on a 5v PIC using hardware SPI.

[ilker07]

I used txs0108e level shifter but it doesn't still work.

signed int8 i;

FILE myfile;
delay_ms(2000);


i = fat_init();
fprintf(SCREEN,"init:%d\n",i);



if(fatopen((char *)"/TEST.TXT", (char *)"r", &myfile) != 0) fprintf(SCREEN,"file err\n");


else {

signed int ch_int;
unsigned char ch;
fprintf(SCREEN,"file ok\n");

fatseek(&myfile, 0, SEEK_SET); // Dosya başına git
for(i = 0; i <2; i++) {


ch_int=fatgetc(&myfile);
if (ch_int != EOF) { ch=(char)ch_int; fprintf(SCREEN,"%c",ch); }

}

fatclose(&myfile);

fprintf(SCREEN,"\n");

}

it gives me i=-1 and it says file ok but it doesn't print any character..

[ilker07]

by the way; even if I write "TST.TXT" it still gives me file ok???