mainfile.c

基于SD卡的FAT文件系统

/*
  The SD card  base on FAT12/16 file system.
  Jacky.L  2008.1 

  Only Support ATMEGA16 and ATMEGA32
  SD card connected:
  
	 /--------------- -|
    /  1 2 3 4 5 6 7 8 |
   /9                  |
   |                   |
   |                   |
   |                   |
   | (bottom side)     |
   |                   |
   |                   |
   |                   |
   |                   |
   |                   |
   |___________________|

  1 --------------- SS(PB4)
  2 ---|47 ohm |--- MOSI(PB5)
  3 --------------- GND
  4 --------------- VCC (3.3V)
  5 ---|47 ohm |--- SCK(PB7)
  6 --------------- GND
  7 ---|47 ohm |--- MISO(PB6)
  8 --- NC.
  9 --- NC.
*/

// Fosc= 7.3MHz



#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <string.h>

#include "sdfs.h"
#include "dataType.h"


FILINFO finfo;
FATFS fatfs;				/* File system object for each logical drive */

static volatile 
BYTE timeDelay;



/*---------------------------------------------------------*/
/* 100Hz timer interrupt generated by OC2                  */
/*---------------------------------------------------------*/


ISR(TIMER2_COMP_vect)
{
    if(timeDelay) timeDelay--;
	disk_timerproc();	/* Drive timer procedure of low level disk I/O module */
}





/*---------------------------------------------------------*/
/* User Provided Timer Function for FatFs module           */
/*---------------------------------------------------------*/
/* This is a real time clock service to be called from     */
/* FatFs module. Any valid time must be returned even if   */
/* the system does not support a real time clock.          */
DWORD get_fattime ()
{
	return	((2006UL-1980) << 25)	// Year = 2006
			| (2UL << 21)			// Month = Feb
			| (9UL << 16)			// Day = 9
			| (22U << 11)			// Hour = 22
			| (30U << 5)			// Min = 30
			| (0U >> 1)				// Sec = 0
			;

}



static
void IoInit ()
{


	OCR2 = 90-1;		// Timer2: 100Hz interval (OC2)
	TCCR2 = 0b00001101;

	TIMSK = 0b10000000;	// Enable TC2.oc, TC0.oc interrupt

	sei();

}



/*-----------------------------------------------------------------------*/
/* Main                                                                  */

BYTE linebuf[15];
BYTE filebuf[128];
BYTE fileNamebuf[6];

void init_fileNamebuf(void)
{
 fileNamebuf[0]='0';
 fileNamebuf[1]='.';
 fileNamebuf[2]='B';
 fileNamebuf[3]='I';
 fileNamebuf[4]='N';
 fileNamebuf[5]='\0';
}

void sentdata(BYTE  indata)
{
	//add sent out function with the reading data on file.
	//.........
	//.........
	//.........
	//.........
}

int main ()
{
    BYTE i,j;
	UINT  s2; 
	FATFS *fs;
	DIR dir;			
	FIL file1;

	IoInit();
    init_fileNamebuf();


	disk_initialize(0);
	f_mount(0, &fatfs);	

 

			for(i=0;;i++,i%=4)
			{
				
				fileNamebuf[0]='1'+i;

				f_open(&file1, fileNamebuf, FA_OPEN_EXISTING | FA_READ);
				do
				{
				f_read(&file1, filebuf, 128, &s2);

		                for(j=0;j<s2;j++)
						  {
							sentdata(filebuf[j]);
						  }
			
				}while(s2);
                
				timeDelay=250;
				while(timeDelay);
				timeDelay=250;
				while(timeDelay);

				f_close(&file1);

				timeDelay=250;
				while(timeDelay);
			}

				while(1);
       
}