d12hal.c

来自「单片机C语言程序」· C语言 代码 · 共 67 行

#include<ds89c4xx.h>
#include"mytype.h"

#define USB_COMMAND_ADD		1
#define USB_DATA_ADD		0

//USB芯片连接引脚
#define USB_DATA	P0
#define USB_A0		P35
#define USB_WR		P36
#define USB_RD		P37
#define USB_INT		P32

//延时函数 
void delay(uint8 idata n)                
{
	uint8 idata i;
	while(n--)
	{
		i = 10;
		while(i--);
	}
}

//写USB命令
void WriteUsbCommand(uint8 idata command)
{
	USB_A0 = USB_COMMAND_ADD;
	delay(1);
	USB_DATA = command;
	delay(1);
	USB_WR = 0;
	delay(1);
	USB_WR = 1;
	//delay(5);
	USB_DATA = 0xff;
}

//写一字节USB数据
void WriteUsbData(uint8 idata wdata)       
{
	USB_A0 = USB_DATA_ADD;
	delay(1);
	USB_DATA = wdata;
	delay(1);
	USB_WR = 0;
	delay(1);
	USB_WR = 1;
	//delay(5);
	USB_DATA = 0xff;
}

//读一字节USB数据
uint8 ReadUsbData(void)
{
	uint8 idata temp;
	//USB_DATA = 0xff;
	USB_A0 = USB_DATA_ADD;
	delay(1);
	USB_RD = 0;
	delay(1);
	temp = USB_DATA;
	delay(1);
	USB_RD = 1;
	delay(1);
	return temp;
}