LM3S9B96的例程usb_dev_bulk中断问题

只看该作者 · 2012-4-2 12:39

我看usb_dev_bulk例程，没用发现在何处处理bulk接口IN中断，下面是我的理解
首先，在启动代码startup_ewarm.c中定义了USB中断函数
__root const uVectorEntry __vector_table[] @ ".intvec" =
{
{ .ulPtr = (unsigned long)pulStack + sizeof(pulStack) },
                                          // The initial stack pointer
ResetISR,                            // The reset handler
NmiSR,                               // The NMI handler
FaultISR,                            // The hard fault handler
.......
USB0DeviceIntHandler,                // USB0
.......
};
USB0DeviceIntHandler函数在usblib/device/usbdhandler.c文件中定义
void USB0DeviceIntHandler(void)
{
unsigned long ulStatus;
//
// Get the controller interrupt status.
//
ulStatus = MAP_USBIntStatusControl(USB0_BASE);
//
// Call the internal handler.
//
USBDeviceIntHandlerInternal(0, ulStatus);
}
其实际处理usb中断的函数USBDeviceIntHandlerInternal在usblib/device/usbdenum.c  中定义，以下是这个函数的代码，可是我怎么也找不到何处是处理bulk IN
或bulk out的代码，就是说没有地方反映主机发来一个针对BULK端点的IN或OUT令牌。哪位知道，给指点指点，多谢!
USBDeviceIntHandlerInternal(unsigned long ulIndex, unsigned long ulStatus)
{
static unsigned long ulSOFDivide = 0;
tDeviceInfo *psInfo;
void *pvInstance;
//
// If device initialization has not been performed then just disconnect
// from the USB bus and return from the handler.
//
if(g_psUSBDevice[0].psInfo == 0)
{
      MAP_USBDevDisconnect(USB0_BASE);
      return;
}
psInfo = g_psUSBDevice[0].psInfo;
pvInstance = g_psUSBDevice[0].pvInstance;
//
// Received a reset from the host.
//
if(ulStatus & USB_INTCTRL_RESET)
{
      USBDeviceEnumResetHandler(&g_psUSBDevice[0]);
}
//
// Suspend was signaled on the bus.
//
if(ulStatus & USB_INTCTRL_SUSPEND)
{
      //
      // Call the SuspendHandler() if it was specified.
      //
      if(psInfo->sCallbacks.pfnSuspendHandler)
      {
         psInfo->sCallbacks.pfnSuspendHandler(pvInstance);
      }
}
//
// Resume was signaled on the bus.
//
if(ulStatus & USB_INTCTRL_RESUME)
{
      //
      // Call the ResumeHandler() if it was specified.
      //
      if(psInfo->sCallbacks.pfnResumeHandler)
      {
         psInfo->sCallbacks.pfnResumeHandler(pvInstance);
      }
}
//
// USB device was disconnected.
//
if(ulStatus & USB_INTCTRL_DISCONNECT)
{
      //
      // Call the DisconnectHandler() if it was specified.
      //
      if(psInfo->sCallbacks.pfnDisconnectHandler)
      {
         psInfo->sCallbacks.pfnDisconnectHandler(pvInstance);
      }
}
//
// Start of Frame was received.
//
if(ulStatus & USB_INTCTRL_SOF)
{
      //
      // Increment the global Start of Frame counter.
      //
      g_ulUSBSOFCount++;
      //
      // Increment our SOF divider.
      //
      ulSOFDivide++;
      //
      // Handle resume signaling if required.
      //
      USBDeviceResumeTickHandler(&g_psUSBDevice[0]);
      //
      // Have we counted enough SOFs to allow us to call the tick function?
      //
      if(ulSOFDivide == USB_SOF_TICK_DIVIDE)
      {
         //
         // Yes - reset the divider and call the SOF tick handler.
         //
         ulSOFDivide = 0;
         InternalUSBStartOfFrameTick(USB_SOF_TICK_DIVIDE);
      }
}
//
// Get the controller interrupt status.
//
ulStatus = MAP_USBIntStatusEndpoint(USB0_BASE);
//
// Handle end point 0 interrupts.
//
if(ulStatus & USB_INTEP_0)
{
      USBDeviceEnumHandler(&g_psUSBDevice[0]);
}
//
// Because there is no way to detect if a uDMA interrupt has occurred,
// check for an endpoint callback and call it if it is available.
//
if(psInfo->sCallbacks.pfnEndpointHandler)
{
      psInfo->sCallbacks.pfnEndpointHandler(pvInstance, ulStatus);
}
}

只看该作者 · 2012-4-2 20:15

不是很清楚帮楼主顶下了

只看该作者 · 2012-4-2 20:16

希望有专家帮你解答

只看该作者 · 2012-4-6 18:52

在usbdbulk.c里面有，这部分实际上被USB驱动库封装起来了，例程里采用回调函数进行数据发送和接受滴。

复制



//*****************************************************************************

//

// This function is called to handle the interrupts on the Bulk endpoints for

// the mass storage class.

//

//*****************************************************************************

static void

HandleEndpoints(unsigned long ulIndex, unsigned long ulStatus)

LM3S9B96的例程usb_dev_bulk中断问题

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