bulkin.c

用Keil uVision2编写得批量in传输程序

/* bulkin_a.C 6-18-00   LTH
 A Simple bulk IN transfer.  Loads EP2IN buffer with an incrementing count, 
 then arms IN2 for transfer.  When transmitted, replace byte zero of the 
 EP2IN buffer with a count indicating the number of IN transfers and re-arm
 EP2IN for the next IN transfer.
*/
xdata volatile char IN2BUF[64] _at_ 0x7E00;  	// TRM p. 12-3
xdata volatile char IN2BC _at_ 0x7FB9; 	     	// TRM p. 12-34
xdata volatile char IN2CS _at_ 0x7FB8;	     	// TRM p. 12-32
#define	bBSY	0x02				// TRM p. 12-32
char j,count;
main()
{
for (j=0; j<64; j++)	// fill IN2 buffer with incrementing count
	IN2BUF[j]=j;
IN2BC = 50;		// arm the first transfer
count = 0;		// initialize transfer counter
while (1)		// forever
	{
	while (IN2CS & bBSY);	// loop while IN2 busy bit is HI
	count++;         	// busy bit went LO--IN2BUF ready for more data
	IN2BUF[0] = count;	// replace first buffer byte with count
	IN2BC	  = 50;	// arm the next IN2 transfer by loading byte count
	}	
}