//*****************************************************************************
//
// Device instance specific handler.
//
//*****************************************************************************
static void
HandleDevice(void *pvInstance, unsigned int ulRequest, void *pvRequestData)
{
tBulkInstance *psInst;
unsigned char *pucData;
//
// Create the serial instance data.
//
psInst = ((tUSBDBulkDevice *)pvInstance)->psPrivateBulkData;
//
// Create the char array used by the events supported by the USB CDC
// serial class.
//
pucData = (unsigned char *)pvRequestData;
switch(ulRequest)
{
//
// This was an interface change event.
//
case USB_EVENT_COMP_IFACE_CHANGE:
{
psInst->ucInterface = pucData[1];
break;
}
//
// This was an endpoint change event.
//
case USB_EVENT_COMP_EP_CHANGE:
{
//
// Determine if this is an IN or OUT endpoint that has changed.
//
if(pucData[0] & USB_EP_DESC_IN)
{
psInst->ucINEndpoint = INDEX_TO_USB_EP((pucData[1] & 0x7f));
}
else
{
//
// Extract the new endpoint number.
//
psInst->ucOUTEndpoint = INDEX_TO_USB_EP(pucData[1] & 0x7f);
}
break;
}
default:
{
break;
}
}
}
//*****************************************************************************
//
//! Configure the USB controller appropriately for the device whose config
//! descriptor is passed.
//!
//! \param ulIndex is the zero-based index of the USB controller which is to
//! be configured.
//! \param psConfig is a pointer to the configuration descriptor that the
//! USB controller is to be set up to support.
//! \param psFIFOConfig is a pointer to an array of NUM_USB_EP tFIFOConfig
//! structures detailing how the FIFOs are to be set up for each endpoint
//! used by the configuration.
//!
//! This function may be used to initialize a USB controller to operate as
//! the device whose configuration descriptor is passed. The function
//! enables the USB controller, partitions the FIFO appropriately and
//! configures each endpoint required by the configuration. If the supplied
//! configuration supports multiple alternate settings for any interface,
//! the USB FIFO is set up assuming the worst case use (largest packet size
//! for a given endpoint in any alternate setting using that endpoint) to
//! allow for on-the-fly alternate setting changes later. On return from this
//! function, the USB controller is configured for correct operation of
//! the default configuration of the device described by the descriptor passed.
//!
//! The \e psFIFOConfig parameter allows the caller to provide additional
//! information on USB FIFO configuration that cannot be determined merely
//! by parsing the configuration descriptor. The descriptor provides
//! information on the endpoints that are to be used and the maximum packet
//! size for each but cannot determine whether, for example, double buffering
//! is to be used or how many packets the application wants to be able to
//! store in a given endpoint's FIFO.
//!
//! USBDCDConfig() is an optional call and applications may chose to make
//! direct calls to SysCtlPeripheralEnable(), SysCtlUSBPLLEnable(),
//! USBDevEndpointConfigSet() and USBFIFOConfigSet() instead of using this
//! function. If this function is used, it must be called prior to
//! USBDCDInit() since this call assumes that the low level hardware
//! configuration has been completed before it is made.
//!
//! \return Returns \b true on success or \b false on failure.
//
//*****************************************************************************
tBoolean
USBDeviceConfig(unsigned long ulIndex, const tConfigHeader *psConfig,
const tFIFOConfig *psFIFOConfig)
{
unsigned long ulLoop;
unsigned long ulCount;
unsigned long ulNumInterfaces;
unsigned long ulEpIndex;
unsigned long ulEpType;
unsigned long ulMaxPkt;
unsigned long ulNumEndpoints;
unsigned long ulFlags;
unsigned long ulBytesUsed;
unsigned long ulSection;
tInterfaceDescriptor *psInterface;
tEndpointDescriptor *psEndpoint;
tUSBEndpointInfo psEPInfo[NUM_USB_EP - 1];
//
// We only support 1 USB controller currently.
//
ASSERT(ulIndex == 0);
//
// Catch bad pointers in a debug build.
//
ASSERT(psConfig);
ASSERT(psFIFOConfig);
//
// Clear out our endpoint info.
//
for(ulLoop = 0; ulLoop < (NUM_USB_EP - 1); ulLoop++)
{
psEPInfo[ulLoop].ulSize[EP_INFO_IN] = 0;
psEPInfo[ulLoop].ulType[EP_INFO_IN] = 0;
psEPInfo[ulLoop].ulSize[EP_INFO_OUT] = 0;
psEPInfo[ulLoop].ulType[EP_INFO_OUT] = 0;
}
//
// How many (total) endpoints does this configuration describe?
//
ulNumEndpoints = USBDCDConfigDescGetNum(psConfig,
USB_DTYPE_ENDPOINT);
//
// How many interfaces are included?
//
ulNumInterfaces = USBDCDConfigDescGetNum(psConfig,
USB_DTYPE_INTERFACE);
//
// Look at each endpoint and determine the largest max packet size for
// each endpoint. This will determine how we partition the USB FIFO.
//
for(ulLoop = 0; ulLoop < ulNumEndpoints; ulLoop++)
{
//
// Get a pointer to the endpoint descriptor.
//
psEndpoint = (tEndpointDescriptor *)USBDCDConfigDescGet(
psConfig, USB_DTYPE_ENDPOINT, ulLoop,
&ulSection);
//
// Extract the endpoint number and whether it is an IN or OUT
// endpoint.
//
ulEpIndex = (unsigned long)
psEndpoint->bEndpointAddress & USB_EP_DESC_NUM_M;
ulEpType = (psEndpoint->bEndpointAddress & USB_EP_DESC_IN) ?
EP_INFO_IN : EP_INFO_OUT;
//
// Make sure the endpoint number is valid for our controller. If not,
// return false to indicate an error. Note that 0 is invalid since
// you shouldn't reference endpoint 0 in the config descriptor.
//
if((ulEpIndex >= NUM_USB_EP) || (ulEpIndex == 0))
{
return(false);
}
//
// Does this endpoint have a max packet size requirement larger than
// any previous use we have seen?
//
if(psEndpoint->wMaxPacketSize >
psEPInfo[ulEpIndex - 1].ulSize[ulEpType])
{
//
// Yes - remember the new maximum packet size.
//
psEPInfo[ulEpIndex - 1].ulSize[ulEpType] =
psEndpoint->wMaxPacketSize;
}
}
//
// At this point, we have determined the maximum packet size required
// for each endpoint by any possible alternate setting of any interface
// in this configuration. Now determine the endpoint settings required
// for the interface setting we are actually going to use.
//
for(ulLoop = 0; ulLoop < ulNumInterfaces; ulLoop++)
{
//
// Get the next interface descriptor in the config descriptor.
//
psInterface = USBDCDConfigGetInterface(psConfig,
ulLoop,
USB_DESC_ANY,
&ulSection);
//
// Is this the default interface (bAlternateSetting set to 0)?
//
if(psInterface && (psInterface->bAlternateSetting == 0))
{
//
// This is an interface we are interested in so gather the
// information on its endpoints.
//
ulNumEndpoints = (unsigned long)psInterface->bNumEndpoints;
//
// Walk through each endpoint in this interface and configure
// it appropriately.
//
for(ulCount = 0; ulCount < ulNumEndpoints; ulCount++)
{
//
// Get a pointer to the endpoint descriptor.
//
psEndpoint = USBDCDConfigGetInterfaceEndpoint(psConfig,
psInterface->bInterfaceNumber,
psInterface->bAlternateSetting,
ulCount);
//
// Make sure we got a good pointer.
//
if(psEndpoint)
{
//
// Determine maximum packet size and flags from the
// endpoint descriptor.
//
GetEPDescriptorType(psEndpoint, &ulEpIndex, &ulMaxPkt,
&ulFlags);
//
// Make sure no-one is trying to configure endpoint 0.
//
if(!ulEpIndex)
{
return(false);
}
//
// Include any additional flags that the user wants.
//
if((ulFlags & (USB_EP_DEV_IN | USB_EP_DEV_OUT)) ==
USB_EP_DEV_IN)
{
//
// This is an IN endpoint.
//
ulFlags |= (unsigned long)(
psFIFOConfig->sIn[ulEpIndex - 1].usEPFlags);
psEPInfo[ulEpIndex - 1].ulType[EP_INFO_IN] = ulFlags;
}
else
{
//
// This is an OUT endpoint.
//
ulFlags |= (unsigned long)(
psFIFOConfig->sOut[ulEpIndex - 1].usEPFlags);
psEPInfo[ulEpIndex - 1].ulType[EP_INFO_OUT] = ulFlags;
}
//
// Set the endpoint configuration.
//
USBDevEndpointConfigSet(USB0_BASE,
INDEX_TO_USB_EP(ulEpIndex),
ulMaxPkt, ulFlags);
}
}
}
}
//
// At this point, we have configured all the endpoints that are to be
// used by this configuration's alternate setting 0. Now we go on and
// partition the FIFO based on the maximum packet size information we
// extracted earlier. Endpoint 0 is automatically configured to use the
// first MAX_PACKET_SIZE_EP0 bytes of the FIFO so we start from there.
//
ulCount = MAX_PACKET_SIZE_EP0;
for(ulLoop = 1; ulLoop < NUM_USB_EP; ulLoop++)
{
//
// Configure the IN endpoint at this index if it is referred to
// anywhere.
//
if(psEPInfo[ulLoop - 1].ulSize[EP_INFO_IN])
{
//
// What FIFO size flag do we use for this endpoint?
//
ulMaxPkt = GetEndpointFIFOSize(
psEPInfo[ulLoop - 1].ulSize[EP_INFO_IN],
&(psFIFOConfig->sIn[ulLoop - 1]),
&ulBytesUsed);
//
// If we are told that 0 bytes of FIFO will be used, this implies
// that there is an error in psFIFOConfig or the descriptor
// somewhere so return an error indicator to the caller.
//
if(!ulBytesUsed)
{
return(false);
}
//
// Now actually configure the FIFO for this endpoint.
//
USBFIFOConfigSet(USB0_BASE, INDEX_TO_USB_EP(ulLoop), ulCount,
ulMaxPkt, USB_EP_DEV_IN);
ulCount += ulBytesUsed;
}
//
// Configure the OUT endpoint at this index.
//
if(psEPInfo[ulLoop - 1].ulSize[EP_INFO_OUT])
{
//
// What FIFO size flag do we use for this endpoint?
//
ulMaxPkt = GetEndpointFIFOSize(
psEPInfo[ulLoop - 1].ulSize[EP_INFO_OUT],
&(psFIFOConfig->sOut[ulLoop - 1]),
&ulBytesUsed);
//
// If we are told that 0 bytes of FIFO will be used, this implies
// that there is an error in psFIFOConfig or the descriptor
// somewhere so return an error indicator to the caller.
//
if(!ulBytesUsed)
{
return(false);
}
//
// Now actually configure the FIFO for this endpoint.
//
USBFIFOConfigSet(USB0_BASE, INDEX_TO_USB_EP(ulLoop), ulCount,
ulMaxPkt, USB_EP_DEV_OUT);
ulCount += ulBytesUsed;
}
}
//
// If we get to the end, all is well.
//
return(true);
}
//*****************************************************************************
//
//! Configure the affected USB endpoints appropriately for one alternate
//! interface setting.
//!
//! \param ulIndex is the zero-based index of the USB controller which is to
//! be configured.
//! \param psConfig is a pointer to the configuration descriptor that contains
//! the interface whose alternate settings is to be configured.
//! \param ucInterfaceNum is the number of the interface whose alternate
//! setting is to be configured. This number corresponds to the
//! bInterfaceNumber field in the desired interface descriptor.
//! \param ucAlternateSetting is the alternate setting number for the desired
//! interface. This number corresponds to the bAlternateSetting field in the
//! desired interface descriptor.
//!
//! This function may be used to reconfigure the endpoints of an interface
//! for operation in one of the interface's alternate settings. Note that this
//! function assumes that the endpoint FIFO settings will not need to change
//! and only the endpoint mode is changed. This assumption is valid if the
//! USB controller was initialized using a previous call to USBDCDConfig().
//!
//! In reconfiguring the interface endpoints, any additional configuration
//! bits set in the endpoint configuration other than the direction (\b
//! USB_EP_DEV_IN or \b USB_EP_DEV_OUT) and mode (\b USB_EP_MODE_MASK) are
//! preserved.
//!
//! \return Returns \b true on success or \b false on failure.
//
//*****************************************************************************
tBoolean
USBDeviceConfigAlternate(unsigned long ulIndex, const tConfigHeader *psConfig,
unsigned char ucInterfaceNum,
unsigned char ucAlternateSetting)
{
unsigned long ulNumInterfaces;
unsigned long ulNumEndpoints;
unsigned long ulLoop;
unsigned long ulCount;
unsigned long ulMaxPkt;
unsigned long ulOldMaxPkt;
unsigned long ulFlags;
unsigned long ulOldFlags;
unsigned long ulSection;
unsigned long ulEpIndex;
tInterfaceDescriptor *psInterface;
tEndpointDescriptor *psEndpoint;
//
// How many interfaces are included in the descriptor?
//
ulNumInterfaces = USBDCDConfigDescGetNum(psConfig,
USB_DTYPE_INTERFACE);
//
// Find the interface descriptor for the supplied interface and alternate
// setting numbers.
//
for(ulLoop = 0; ulLoop < ulNumInterfaces; ulLoop++)
{
//
// Get the next interface descriptor in the config descriptor.
//
psInterface = USBDCDConfigGetInterface(psConfig, ulLoop, USB_DESC_ANY,
&ulSection);
//
// Is this the default interface (bAlternateSetting set to 0)?
//
if(psInterface &&
(psInterface->bInterfaceNumber == ucInterfaceNum) &&
(psInterface->bAlternateSetting == ucAlternateSetting))
{
//
// This is an interface we are interested in and the descriptor
// representing the alternate setting we want so go ahead and
// reconfigure the endpoints.
//
//
// How many endpoints does this interface have?
//
ulNumEndpoints = (unsigned long)psInterface->bNumEndpoints;
//
// Walk through each endpoint in turn.
//
for(ulCount = 0; ulCount < ulNumEndpoints; ulCount++)
{
//
// Get a pointer to the endpoint descriptor.
//
psEndpoint = USBDCDConfigGetInterfaceEndpoint(psConfig,
psInterface->bInterfaceNumber,
psInterface->bAlternateSetting,
ulCount);
//
// Make sure we got a good pointer.
//
if(psEndpoint)
{
//
// Determine maximum packet size and flags from the
// endpoint descriptor.
//
GetEPDescriptorType(psEndpoint, &ulEpIndex, &ulMaxPkt,
&ulFlags);
//
// Make sure no-one is trying to configure endpoint 0.
//
if(!ulEpIndex)
{
return(false);
}
//
// Get the existing endpoint configuration and mask in the
// new mode and direction bits, leaving everything else
// unchanged.
//
ulOldFlags = ulFlags;
USBDevEndpointConfigGet(USB0_BASE,
INDEX_TO_USB_EP(ulEpIndex),
&ulOldMaxPkt,
&ulOldFlags);
//
// Mask in the previous DMA and auto-set bits.
//
ulFlags = (ulFlags & EP_FLAGS_MASK) |
(ulOldFlags & ~EP_FLAGS_MASK);
//
// Set the endpoint configuration.
//
USBDevEndpointConfigSet(USB0_BASE,
INDEX_TO_USB_EP(ulEpIndex),
ulMaxPkt, ulFlags);
}
}
//
// At this point, we have reconfigured the desired interface so
// return indicating all is well.
//
return(true);
}
}
return(false);
}
//*****************************************************************************
//
//! Configure the affected USB endpoints appropriately for one alternate
//! interface setting.
//!
//! \param psDevInst is a pointer to the device instance being configured.
//! \param psConfig is a pointer to the configuration descriptor that contains
//! the interface whose alternate settings is to be configured.
//! \param ucInterfaceNum is the number of the interface whose alternate
//! setting is to be configured. This number corresponds to the
//! bInterfaceNumber field in the desired interface descriptor.
//! \param ucAlternateSetting is the alternate setting number for the desired
//! interface. This number corresponds to the bAlternateSetting field in the
//! desired interface descriptor.
//!
//! This function may be used to reconfigure the endpoints of an interface
//! for operation in one of the interface's alternate settings. Note that this
//! function assumes that the endpoint FIFO settings will not need to change
//! and only the endpoint mode is changed. This assumption is valid if the
//! USB controller was initialized using a previous call to USBDCDConfig().
//!
//! In reconfiguring the interface endpoints, any additional configuration
//! bits set in the endpoint configuration other than the direction (\b
//! USB_EP_DEV_IN or \b USB_EP_DEV_OUT) and mode (\b USB_EP_MODE_MASK) are
//! preserved.
//!
//! \return Returns \b true on success or \b false on failure.
//
//*****************************************************************************
tBoolean
USBDeviceConfigAlternate(tDeviceInstance *psDevInst, const tConfigHeader *psConfig,
unsigned char ucInterfaceNum,
unsigned char ucAlternateSetting)
{
unsigned long ulNumInterfaces;
unsigned long ulNumEndpoints;
unsigned long ulLoop;
unsigned long ulCount;
unsigned long ulMaxPkt;
unsigned long ulFlags;
unsigned long ulSection;
unsigned long ulEpIndex;
tInterfaceDescriptor *psInterface;
tEndpointDescriptor *psEndpoint;
tFIFOConfig const *psFIFOConfig;
//
// How many interfaces are included in the descriptor?
//
ulNumInterfaces = USBDCDConfigDescGetNum(psConfig,
USB_DTYPE_INTERFACE);
psFIFOConfig = psDevInst->psInfo->psFIFOConfig;
//
// Find the interface descriptor for the supplied interface and alternate
// setting numbers.
//
for(ulLoop = 0; ulLoop < ulNumInterfaces; ulLoop++)
{
//
// Get the next interface descriptor in the config descriptor.
//
psInterface = USBDCDConfigGetInterface(psConfig, ulLoop, USB_DESC_ANY,
&ulSection);
//
// Is this the default interface (bAlternateSetting set to 0)?
//
if(psInterface &&
(psInterface->bInterfaceNumber == ucInterfaceNum) &&
(psInterface->bAlternateSetting == ucAlternateSetting))
{
//
// This is an interface we are interested in and the descriptor
// representing the alternate setting we want so go ahead and
// reconfigure the endpoints.
//
//
// How many endpoints does this interface have?
//
ulNumEndpoints = (unsigned long)psInterface->bNumEndpoints;
//
// Walk through each endpoint in turn.
//
for(ulCount = 0; ulCount < ulNumEndpoints; ulCount++)
{
//
// Get a pointer to the endpoint descriptor.
//
psEndpoint = USBDCDConfigGetInterfaceEndpoint(psConfig,
psInterface->bInterfaceNumber,
psInterface->bAlternateSetting,
ulCount);
//
// Make sure we got a good pointer.
//
if(psEndpoint)
{
//
// Determine maximum packet size and flags from the
// endpoint descriptor.
//
GetEPDescriptorType(psEndpoint, &ulEpIndex, &ulMaxPkt,
&ulFlags);
//
// Make sure no-one is trying to configure endpoint 0.
//
if(!ulEpIndex)
{
return(false);
}
//
// Include any additional flags that the user wants.
//
if((ulFlags & (USB_EP_DEV_IN | USB_EP_DEV_OUT)) ==
USB_EP_DEV_IN)
{
//
// This is an IN endpoint.
//
ulFlags |= (unsigned long)(
psFIFOConfig->sIn[ulEpIndex - 1].usEPFlags);
}
else
{
//
// This is an OUT endpoint.
//
ulFlags |= (unsigned long)(
psFIFOConfig->sOut[ulEpIndex - 1].usEPFlags);
}
//
// Set the endpoint configuration.
//
USBDevEndpointConfigSet(USB0_BASE,
INDEX_TO_USB_EP(ulEpIndex),
ulMaxPkt, ulFlags);
}
}
//
// At this point, we have reconfigured the desired interface so
// return indicating all is well.
//
return(true);
}
}
return(false);
}