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Add Report descriptor length function. Change the internal Translate function to return the length of each item added to the raw buffer. Fix some out-of-date comments.

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This commit is contained in:
mbanth
2021-05-25 16:51:54 +01:00
parent d1650afd37
commit fcee74d912
2 changed files with 33 additions and 11 deletions
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29
lib_xua/src/hid/hid_report_descriptor.c
View File

@@ -154,6 +154,7 @@ static const USB_HID_Short_Item_t* const hidReportDescriptorItems[] = {
( sizeof ( USB_HID_Short_Item_t ) - HID_REPORT_ITEM_LOCATION_SIZE ))
static unsigned char hidReportDescriptor[ HID_REPORT_DESCRIPTOR_MAX_LENGTH ];
static size_t hidReportDescriptorLength = 0;
static unsigned hidReportDescriptorPrepared = 0;
/**
@@ -216,12 +217,14 @@ static unsigned hidGetItemType( const unsigned char header );
*
* Parameters:
*
* @param[in] inPtr A pointer to a \c USB_HID_Short_Item
* @param[in,out] outPtr A pointer to the next available space in the raw byte buffer
* @param[in] inPtr A pointer to a \c USB_HID_Short_Item
* @param[in,out] outPtrPtr A pointer to a pointer to the next available space in the raw
* byte buffer. Passed as a pointer to a pointer to allow this
* function to return the updated pointer to the raw byte buffer.
*
* @return The updated \a outPtr
* @return The number of bytes placed in the raw byte buffer
*/
static unsigned char* hidTranslateItem( const USB_HID_Short_Item_t* inPtr, unsigned char* outPtr );
static size_t hidTranslateItem( const USB_HID_Short_Item_t* inPtr, unsigned char** outPtrPtr );
static unsigned hidGetItemBitLocation( const unsigned char location )
@@ -265,12 +268,18 @@ unsigned char* hidGetReportDescriptor( void )
return retVal;
}
size_t hidGetReportDescriptorLength( void )
{
return ( hidReportDescriptorPrepared ) ? hidReportDescriptorLength : 0;
}
void hidPrepareReportDescriptor( void )
{
if( !hidReportDescriptorPrepared ) {
hidReportDescriptorLength = 0;
unsigned char* ptr = hidReportDescriptor;
for( unsigned idx = 0; idx < sizeof hidReportDescriptorItems / sizeof( USB_HID_Short_Item_t ); ++idx ) {
ptr = hidTranslateItem( hidReportDescriptorItems[ idx ], ptr );
hidReportDescriptorLength += hidTranslateItem( hidReportDescriptorItems[ idx ], &ptr );
}
hidReportDescriptorPrepared = 1;
@@ -311,14 +320,16 @@ unsigned hidSetReportItem( const unsigned byte, const unsigned bit, const unsign
return retVal;
}
static unsigned char* hidTranslateItem( const USB_HID_Short_Item_t* inPtr, unsigned char* outPtr )
static size_t hidTranslateItem( const USB_HID_Short_Item_t* inPtr, unsigned char** outPtrPtr )
{
*outPtr++ = inPtr->header;
size_t count = 0;
*(*outPtrPtr)++ = inPtr->header;
unsigned dataLength = hidGetItemSize( inPtr->header );
for( unsigned idx = 0; idx < dataLength; ++idx ) {
*outPtr++ = inPtr->data[ idx ];
*(*outPtrPtr)++ = inPtr->data[ idx ];
++count;
}
return outPtr;
return count;
}

15
lib_xua/src/hid/xua_hid_report_descriptor.h
View File

@@ -56,13 +56,24 @@ typedef struct
* @brief Get the HID Report descriptor
*
* This function returns a pointer to the USB HID Report descriptor.
* It returns NULL if the Report descriptor has not been initialised,
* i.e., no one has called \c hidInitReportDescriptor().
* It returns NULL if the Report descriptor has not been prepared,
* i.e., no one has called \c hidPrepareReportDescriptor().
*
* @return A pointer to a list of unsigned char containing the Report descriptor
*/
unsigned char* hidGetReportDescriptor( void );
/**
* @brief Get the length of the HID Report descriptor
*
* This function returns the length of the USB HID Report descriptor.
* It returns zero if the Report descriptor has not been prepared,
* i.e., no one has called \c hidPrepareReportDescriptor().
*
* @return The length of the Report descriptor in bytes
*/
size_t hidGetReportDescriptorLength( void );
/**
* @brief Prepare the USB HID Report descriptor
*