AM8530 datasheet(183/194 Pages) AMD

183 / 194 page

SCC Application Notes

AMD

7–34

SOFTWARE ROUTINES

Software to Transmit Data at 1 Mb/s Using DMA

#include “stdio.h”

#define arraysize 40

/*size of array for the 8530 sync. init*/

#define port 0x0382

/*I/O port address for the SCC channel A*/

#define aport 0x0380

/*I/O port address for 8530 channel B*/

#define aportd 0x0381

/*I/O data address for 8530 channel B*/

#define arraysiz 18

/*size of array for the 8530 async. init*/

unsigned char *ptr;

unsigned int segread();

struct(int scs, sss, sds, ses; ) rv;

unsigned long int data_segment;

unsigned long int data_seg;

unsigned int num;

unsigned long int adrr;

/*TRANSMIT ROUTINE*/

main()

{

unsigned char var_nam, string1[8], N, n;

unsigned int result, res;

{

/*This routine chooses between synchronous

and asynchronous data transfers*/

printf(“Do you want to print a file(Y/N)? “);

var_nam = scanf(“%s”, string1);

result + strcmp(string1,”N”);

res = strcmp(string1,”n”);

if(result != 0 && res != 0)

{

/*Main routine for asynchronous data transfer*/

printf(“Asynch transmit\n”);

opnfile();

/*Read file from disk into system memory*/

asccinit();

/*Initialize the 8530 for asynchronous trans-

mit*/

trnum();

/*Transmit length of file*/

cont();

atrans();

/*Transmit the entire file*/

else

{

/*Main routine for synchronous data transfer*/

printf(“Synchronous transmit\n” );

opnfile();

sccinit();

dmainit();

cont();

dminit();

}

/*This allows the user to continue transmission of next

file*/

printf(“Do you want to transmit another file(Y/N)? “);

var_nam = scanf(“%s”, string1);

result = strcmp(string1,”N”);

res = strcmp(string1,”n”);

}

while(result != 0 && != 0);

}

AM8530 Datasheet(PDF) 183 Page - Advanced Micro Devices

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