function.h

介绍DSP通过USB与主机的数据传送代码

#define USB_CMD_PORT port01
#define USB_DAT_PORT port0

ioport unsigned USB_CMD_PORT;
ioport unsigned USB_DAT_PORT;


void Delay50ms()   //延时50毫秒
{
	unsigned int i;
	unsigned int j;
	for(i=0;i<500;i++)
	for(j=0;j<1000;j++);
}

void WR_CMD_PORT(unsigned int cmd)   //向CH375的命令端口写入命令
{  	
	asm(" nop");
	USB_CMD_PORT=cmd;
	asm(" nop");
}

void WR_DAT_PORT(unsigned int dat) // 向CH375的数据端口写入数据
{
	USB_DAT_PORT=dat;
	asm(" nop");
}

unsigned int RD_DAT_PORT()      //从CH375的数据端口读出数据
{
	unsigned int k=0; 
	asm(" nop");
	k=USB_DAT_PORT;
	return k;
}