Fix demos based on the device mode HID class driver, as well as the driver itself...

[pub/USBasp.git] / Projects / Magstripe / Magstripe.c

diff --git a/Projects/Magstripe/Magstripe.c b/Projects/Magstripe/Magstripe.c
index 6d463d6..f0fd8a7 100644 (file)
--- a/Projects/Magstripe/Magstripe.c
+++ b/Projects/Magstripe/Magstripe.c
@@ -45,6 +45,9 @@ BitBuffer_t TrackDataBuffers[TOTAL_TRACKS];
 /** Pointer to the current track buffer being sent to the host. */\r
 BitBuffer_t* CurrentTrackBuffer = &TrackDataBuffers[TOTAL_TRACKS];\r
 \r
+/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */\r
+uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)];\r
+\r
 /** LUFA HID Class driver interface configuration and state information. This structure is\r
  *  passed to all HID Class driver functions, so that multiple instances of the same class\r
  *  within a device can be differentiated from one another.\r
@@ -57,6 +60,9 @@ USB_ClassInfo_HID_Device_t Keyboard_HID_Interface =
 \r
                                .ReportINEndpointNumber  = KEYBOARD_EPNUM,\r
                                .ReportINEndpointSize    = KEYBOARD_EPSIZE,\r
+\r
+                               .PrevReportINBuffer      = PrevKeyboardHIDReportBuffer,\r
+                               .PrevReportINBufferSize  = sizeof(PrevKeyboardHIDReportBuffer),\r
                        },\r
        };\r
 \r
@@ -156,15 +162,17 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK)
        HID_Device_MillisecondElapsed(&Keyboard_HID_Interface);\r
 }\r
 \r
-/** HID Class driver callback function for the creation of a HID report for the host.\r
+/** HID class driver callback function for the creation of HID reports to the host.\r
  *\r
- *  \param[in] HIDInterfaceInfo  Pointer to the HID interface structure for the HID interface being referenced\r
- *  \param[in,out] ReportID      Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID\r
- *  \param[out] ReportData       Pointer to the preallocated report buffer where the created report should be stored\r
+ *  \param[in] HIDInterfaceInfo  Pointer to the HID class interface configuration structure being referenced\r
+ *  \param[in,out] ReportID  Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID\r
+ *  \param[out] ReportData  Pointer to a buffer where the created report should be stored\r
+ *  \param[out] ReportSize  Number of bytes written in the report (or zero if no report is to be sent\r
  *\r
- *  \return Number of bytes in the created report\r
+ *  \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent\r
  */\r
-uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, void* ReportData)\r
+bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID,\r
+                                         void* ReportData, uint16_t* ReportSize)\r
 {\r
        USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData;\r
 \r
@@ -190,7 +198,8 @@ uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const H
                KeyboardReport->KeyCode = BitBuffer_GetNextBit(CurrentTrackBuffer) ? KEY_1 : KEY_0;\r
        }\r
        \r
-       return sizeof(USB_KeyboardReport_Data_t);\r
+       *ReportSize = sizeof(USB_KeyboardReport_Data_t);\r
+       return false;\r
 }\r
 \r
 /** HID Class driver callback function for the processing of a received HID report from the host.\r