Hi Kevin
You write that you are planning to access the drive directly from the PIC=2E
Are you going to implement an IDE interface from the PIC? This sounds
interesting=2E
Anyway, the int25 and int13 calls are as you may know interface calls to PC
DOS, the very code that does the trick is hidden in the DOS=2E
I have used int calls a lot but not in Turbo C, unfortunately=2E Hope you ge=
t
the help you need=2E
--------------------------------------------
Hans Nielsen
NIELSEN Elektronik
nielsen=2Eelek@wanadoo=2Efr
-------------------------------------------


> -----Ursprungligt meddelande-----
> Fr=E5n: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA=2EMIT=2EEDU]F=F6r Kevin A=2E Benedict
> Skickat: den 25 september 2001 07:34
> Till: PICLIST@MITVMA=2EMIT=2EEDU
> =C4mne: [PIC]: C source code for int25 or int13
>
>
> Hi,
> Does anyone have a C program with source code for reading a sector
> from a hard drive with int25 or int13 ?
> I eventually plan to access the drive with a PIC, but thought I
> would start with a simple(?) C program=2E
> The program I was trying to use is below, it was written in MS C 5=2E10,
> I have TurboC 2=2E0=2E If I include the far pointer it won't compile,
> if I don't include it, it doesn't like the FP_ statements=2E
> Any help/comments would be appreciated=2E
>
> Thanks,
> Kevin
>
>
> /* Read a Sector from the Harddrive */
> #include <stdio=2Eh>
> #include <dos=2Eh>
>
> struct parm_block {
>      unsigned long start_sector;
>      unsigned num_of_sectors;
>      char far *buffer;
> }
>
> main()
> {
>   union REGS inregs, outregs;
>   struct SREGS segregs;
>
> /* original code had struct far parm_block p_block; */
>   struct parm_block p_block;
>
> /* construct parameter block */
>
>   p_block=2Estart_sector =3D 0;
>   p_block=2Enum_of_sectors =3D 1;
>   p_block=2Ebuffer =3D (char far *) farmalloc(512) ; /* buffer for 1 secto=
r */
>
> /* call function */
>   inregs=2Eh=2Eal =3D 0x02;              /* drive c */
>   inregs=2Ex=2Ecx =3D 0xffff;            /* extended calling format */
>   inregs=2Ex=2Ebx =3D FP_OFF(p_block);   /* xfer pblock offset to bx */
>   segregs=2Eds =3D FP_SEG(p_block);    /* xfer pblock segment to ds */
>     int86x(0x25, &inregs, &outregs, &segregs); /* read sector to buffer */
>
>
>   if ((outregs=2Ex=2Ecflag & 0x01) =3D=3D 0x01) {
>      printf("\nError Code: %x", outregs=2Ex=2Eax);  /* check for error */
>      exit(1);
>      }
>                  /* Process sector here*/
>   exit(0);
> }
> Code from The indispensible PC hardware book by Hans-Peter Messmer
>
> --
> http://www=2Epiclist=2Ecom hint: The list server can filter out subtopics
> (like ads or off topics) for you=2E See http://www=2Epiclist=2Ecom/#topics
>
>

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics