AM85C30 datasheet(189/194 Pages) AMD

189 / 194 page

SCC Application Notes

AMD

7–40

Software to Receive Data at 1 Mb/s using DMA

#include “stdio.h”

#define arraysize 40

/*size of array for the 8530 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 22

/*size of array for 8530 asynch. init.*/

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;

/*RECEIVE ROUTINE*/

main()

{

unsigned int result, res;

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

{

/*Choose synchronous or asynchronous receiving*/

printf(“IS THIS DEVICE A PRINTER(Y/N)? “);

var_nam = scanf(“%s”, string1);

result = strcamp(string1, “N”);

res = strcmp(string1, “n’);

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

{

/*Main routine for asynchronous receive*/

num = 0x03;

opnfile();

asccinit();

/*Initialize 8530 for async rec.*/

printf(“WAITING FOR DATA\n”);

recnum();

/*Receive length of file*/

length();

/*Determine length of file*/

opnfile();

recfile();

/*Receive the entire file*/

printf(“WOW!! I RECEIVED THE DATA!\N”);

closfile();

/*Transfer received file to disk*/

}

else

{

/*Main routine for synchronous receive*/

num = 0x03;

opnfile();

sccinit();

dmainit();

printf(“WAITING FOR DATA\n”);

end();

length();

opnfile();

dminit();

end();

printf(“WOW!! I RECEIVED THE DATA\n”);

closfile();

}

/*Allows user continuous reception of files*/

printf(“Do you wish to receive another file(Y/N)? “);

AM85C30 Datasheet(PDF) 189 Page - Advanced Micro Devices

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