AM8530 datasheet(184/194 Pages) AMD

184 / 194 page

SCC Application Notes

AMD

7–35

/*THIS ROUTINE LOADS THE FILE FROM DISK TO BUFFER MEMORY*/

opnfile()

{

char var_nam, name[16],*ptrr;

extern char *alloc( );

unsigned int fd, endpos, begpos, count, numd;

unsigned int;

int num_read, i, numr;

printf(“Enter name of file to be transferred: “);

var_nam = scanf(“%s”, name);

fd = fopen(name, “rb”);

endpos = fseek(fd,OL,2);

/*looks for end of file*/

fclose(fd);

fd = open(name, BREAD);

/*opens the file as binary

file*/

if(fd<0)

{ fputs(“file not opened”, stdout); return;}

ptr = alloc(endpos+1);

/*allocates memory space for

file

beginning at ptr*/

for(i=0;i<endpos;i++) *(ptr+i)=’\0’;

ptrr = ptr;

num = 0;

num_read = 1;

while(num_read!=0)

{

/*This reads the file from disk starting at location ptrr*/

num_read = read(fed,ptrr,endpos);

num = num + num_read;

/*calculates length of file*/

ptrr = ptrr + num_read:

}

ptr = ptr – 2;

num = num + 2;

*ptr = num;

/*appends lower byte of length to beginning of

file*/

ptr++;

numd = num >> 0x08;

*ptr = 0x02;

/*address of receiving device is attached*/

adrr = 01;

segread(&rv);

data_segment = rv.sds;

data_seg = data_segment << 4;

addr = data_seg + (long int) ptr; /*absolute 20–bit address

is calculated

/*this is required by the DMA controller*/

/*num_read contains:

if –1 error

0 EOF

if >0 number of characters put in buffer*/

close(fd);

return;

}

/*THIS ROUTINE INITIALIZES THE 8530 FOR TRANSMIT*/

sccinit()

{

unsigned char array[arraysize];

/array to initialize SCC

registers*/

unsigned int i+0;

AM8530 Datasheet(PDF) 184 Page - Advanced Micro Devices

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