LPC1768的USB使用-枚举过程

枚举过程如下

#ifndef __USBCORE_H__

#define __USBCORE_H__

/* USB端点0 发送数据结构体*/

typedefstruct _USB_EP_DATA

{

U8*pData;

U16 Count;

}USB_EP_DATA;

/* USB全局变量 */

extern U16 USB_DeviceStatus;

extern U8 USB_DeviceAddress;

extern U8 USB_Configuration;

/* 端点0输出数据缓冲区 */

extern U8 EP0Buf[USB_MAX_PACKET0];

/* 端点输入信息暂存 */

extern USB_EP_DATA EP0Data;

/* usb setup包数据暂存 */

extern USB_SETUP_PACKET SetupPacket;

/* usb初始化类内核变量 */

extern void USB_ResetCore(void);

#endif

#include "usb.h"

#include "usbcfg.h"

#include "usbhw.h"

#include "usbcore.h"

#include "usbdesc.h"

#include "usbuser.h"

#include "hid.h"

#pragma diag_suppress 111,1441

U16 USB_DeviceStatus;//usb的设备状态,比如唤醒之类的

U8 USB_DeviceAddress;//usb设备的地址,在枚举阶段主机会设置地址

U8 USB_Configuration;//usb设备的当前配置(usb可以有几套配置)

U8 EP0Buf[USB_MAX_PACKET0];

USB_EP_DATA EP0Data;

USB_SETUP_PACKET SetupPacket;//usb setup包

//usb设备复位

void USB_ResetCore(void)

{

USB_DeviceStatus=0;//设备上电初始状态

USB_DeviceAddress=0;

USB_Configuration=0;

}

//usbsetup包的获取

void USB_SetupStage(void)

{

USB_ReadEP(0x00,(U8*)&SetupPacket);

}

//usb写入数据 端点0 in

void USB_DataInStage(void)

{

U32 cnt;

if(EP0Data.Count>USB_MAX_PACKET0)

{

cnt=USB_MAX_PACKET0;

}else

{

cnt=EP0Data.Count;

}

cnt=USB_WriteEP(0x80,EP0Data.pData,cnt);

EP0Data.pData+=cnt;

EP0Data.Count-=cnt;

}

//usb输出数据 out

void USB_DataOutStage(void)

{

U32 cnt;

cnt=USB_ReadEP(0x00,EP0Data.pData);

EP0Data.pData+=cnt;

EP0Data.Count-=cnt;

}

//usb发送0状态包

void USB_StatusInStage(void)

{

USB_WriteEP(0x80,NULL,0);

}

//usb读取状态包

void USB_StatusOutStage(void)

{

USB_ReadEP(0x00,EP0Buf);

}

//usb请求描述符(标准请求)

__inline BOOL USB_ReqGetDescriptor(void)

{

U8*pD;

U32 len,n;

switch(SetupPacket.bmRequestType.BM.Recipient)

{

caseREQUEST_TO_DEVICE://设备请求

switch(SetupPacket.wValue.WB.H)

{

caseUSB_DEVICE_DESCRIPTOR_TYPE://设备描述符

EP0Data.pData=(U8*)USB_DeviceDescriptor;

len=USB_DEVICE_DESC_SIZE;

usb_debug_printf("获取设备描述符rn");

break;

caseUSB_CONFIGURATION_DESCRIPTOR_TYPE://配置描述符

pD=(U8*)USB_ConfigDescriptor;

for(n=0;n!=SetupPacket.wValue.WB.L;n++)//可能有多个配置,选择指定的配置

{

if(((USB_CONFIGURATION_DESCRIPTOR*)pD)->bLength!=0)

{

pD+=((USB_CONFIGURATION_DESCRIPTOR*)pD)->wTotalLength;

}

}

if(((USB_CONFIGURATION_DESCRIPTOR*)pD)->bLength==0)

{

usb_debug_printf("没有指定的配置描述符rn");

return(__FALSE);

}

EP0Data.pData=pD;

len=((USB_CONFIGURATION_DESCRIPTOR*)pD)->wTotalLength;

usb_debug_printf("获取配置描述符rn");

break;

caseUSB_STRING_DESCRIPTOR_TYPE://字符串描述符

pD=(U8*)USB_StringDescriptor;

for(n=0;n!=SetupPacket.wValue.WB.L;n++)//根据字符串描述符的ID选择相应的字符串,这一项和设备描述符中的字符串ID相关

{

if(((USB_STRING_DESCRIPTOR*)pD)->bLength!=0)

{

pD+=((USB_STRING_DESCRIPTOR*)pD)->bLength;

}

}

if(((USB_STRING_DESCRIPTOR*)pD)->bLength==0)

{

usb_debug_printf("获取字符串描述符不支持rn");

return(__FALSE);

}

EP0Data.pData=pD;

len=((USB_STRING_DESCRIPTOR*)pD)->bLength;

usb_debug_printf("获取字符串描述符 %drn",n);

break;

default:

usb_debug_printf("不支持的请求对象rn");

return(__FALSE);

}

break;

caseREQUEST_TO_INTERFACE://请求接口

switch(SetupPacket.wValue.WB.H)//接口请求类型

{

caseHID_REPORT_DESCRIPTOR_TYPE://报告描述符

if(SetupPacket.wIndex.WB.L!=USB_HID_IF_NUM)

{

return(__FALSE);/* Only Single HID Interface is supported */

}

EP0Data.pData=(U8*)HID_ReportDescriptor;

len=HID_ReportDescSize;

usb_debug_printf("请求报告描述符rn");

break;

caseHID_PHYSICAL_DESCRIPTOR_TYPE://端点物理特性描述符

usb_debug_printf("不支持的