usbcontrol.c File Reference

#include "type.h"
#include "usbdebug.h"
#include "usbstruct.h"
#include "usbapi.h"

Include dependency graph for usbcontrol.c:

Defines
#define	MAX_CONTROL_SIZE   128
#define	MAX_REQ_HANDLERS   4
Functions
void	USBHandleControlTransfer (U8 bEP, U8 bEPStat)
void	USBRegisterRequestHandler (int iType, TFnHandleRequest *pfnHandler, U8 *pbDataStore)

---

Detailed Description

Control transfer handler.

In case of a control-write (host-to-device), this module collects the full control message in a local buffer, then sends it off to an installed request handler.

In case of a control-read (device-to-host), an installed request handler is asked to handle the request and provide return data. The handler can either put the data in the control data buffer through the supplied pointer, or it can supply a new data pointer. In both cases, the handler is required to update the data length in *piLen;

Currently, control transfers are handled in a very simple way, keeping almost no state about the control transfer progress (setup stage, data stage, status stage). We simply follow the host: if it sends data, we store it in the control data buffer and if it asks for data, we just send the next block.

---

Define Documentation

#define MAX_CONTROL_SIZE   128

maximum total size of control transfer data

#define MAX_REQ_HANDLERS   4

standard, class, vendor, reserved

---

Function Documentation

void USBHandleControlTransfer (  U8  bEP, U8  bEPStat )

Handles IN/OUT transfers on EP0 Parameters: [in]  bEP  Endpoint address [in]  bEPStat  Endpoint status

void USBRegisterRequestHandler (  int  iType, TFnHandleRequest *  pfnHandler, U8 *  pbDataStore )

Registers a callback for handling requests Parameters: [in]  iType  Type of request, e.g. REQTYPE_TYPE_STANDARD [in]  *pfnHandler  Callback function pointer [in]  *pbDataStore  Data storage area for this type of request

---