diff --git a/Demos/Device/ClassDriver/GenericHID/GenericHID.c b/Demos/Device/ClassDriver/GenericHID/GenericHID.c index 4315723f45..9db30cebf7 100644 --- a/Demos/Device/ClassDriver/GenericHID/GenericHID.c +++ b/Demos/Device/ClassDriver/GenericHID/GenericHID.c @@ -36,6 +36,9 @@ #include "GenericHID.h" +/** Buffer to hold the previously generated HID report, for comparison purposes inside the HID class driver. */ +uint8_t PrevHIDReportBuffer[GENERIC_REPORT_SIZE]; + /** LUFA HID Class driver interface configuration and state information. This structure is * passed to all HID Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. @@ -48,6 +51,9 @@ USB_ClassInfo_HID_Device_t Generic_HID_Interface = .ReportINEndpointNumber = GENERIC_IN_EPNUM, .ReportINEndpointSize = GENERIC_EPSIZE, + + .PrevReportINBuffer = PrevHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevHIDReportBuffer), }, }; @@ -126,14 +132,17 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) * \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID * \param[out] ReportData Pointer to a buffer where the created report should be stored + * \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent * - * \return Number of bytes written in the report (or zero if no report is to be sent + * \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent */ -uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, void* ReportData) +bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize) { // Create generic HID report here - return 0; + *ReportSize = 0; + return true; } /** HID class driver callback function for the processing of HID reports from the host. diff --git a/Demos/Device/ClassDriver/GenericHID/GenericHID.h b/Demos/Device/ClassDriver/GenericHID/GenericHID.h index 6d5de7177e..50a92ec1ee 100644 --- a/Demos/Device/ClassDriver/GenericHID/GenericHID.h +++ b/Demos/Device/ClassDriver/GenericHID/GenericHID.h @@ -72,9 +72,9 @@ void EVENT_USB_ConfigurationChanged(void); void EVENT_USB_UnhandledControlPacket(void); - uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, - void* ReportData); - void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, - const void* ReportData, const uint16_t ReportSize); + bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize); + void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, + const void* ReportData, const uint16_t ReportSize); #endif diff --git a/Demos/Device/ClassDriver/Joystick/Joystick.c b/Demos/Device/ClassDriver/Joystick/Joystick.c index ffd167ef59..f4dc32d9b7 100644 --- a/Demos/Device/ClassDriver/Joystick/Joystick.c +++ b/Demos/Device/ClassDriver/Joystick/Joystick.c @@ -36,6 +36,9 @@ #include "Joystick.h" +/** Buffer to hold the previously generated HID report, for comparison purposes inside the HID class driver. */ +uint8_t PrevJoystickHIDReportBuffer[sizeof(USB_JoystickReport_Data_t)]; + /** LUFA HID Class driver interface configuration and state information. This structure is * passed to all HID Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. @@ -48,6 +51,9 @@ USB_ClassInfo_HID_Device_t Joystick_HID_Interface = .ReportINEndpointNumber = JOYSTICK_EPNUM, .ReportINEndpointSize = JOYSTICK_EPSIZE, + + .PrevReportINBuffer = PrevJoystickHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevJoystickHIDReportBuffer), }, }; @@ -128,10 +134,12 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) * \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID * \param[out] ReportData Pointer to a buffer where the created report should be stored + * \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent * - * \return Number of bytes written in the report (or zero if no report is to be sent + * \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent */ -uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, void* ReportData) +bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize) { USB_JoystickReport_Data_t* JoystickReport = (USB_JoystickReport_Data_t*)ReportData; @@ -154,7 +162,8 @@ uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const H if (ButtonStatus_LCL & BUTTONS_BUTTON1) JoystickReport->Button |= (1 << 0); - return sizeof(USB_JoystickReport_Data_t); + *ReportSize = sizeof(USB_JoystickReport_Data_t); + return false; } /** HID class driver callback function for the processing of HID reports from the host. diff --git a/Demos/Device/ClassDriver/Joystick/Joystick.h b/Demos/Device/ClassDriver/Joystick/Joystick.h index 0f35fcce27..764de1723d 100644 --- a/Demos/Device/ClassDriver/Joystick/Joystick.h +++ b/Demos/Device/ClassDriver/Joystick/Joystick.h @@ -83,9 +83,9 @@ void EVENT_USB_ConfigurationChanged(void); void EVENT_USB_UnhandledControlPacket(void); - uint16_t CALLBACK_HID_Device_CreateNextHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, - void* ReportData); - void CALLBACK_HID_Device_ProcessReceivedHIDReport(USB_ClassInfo_HID_Device_t* HIDInterfaceInfo, const uint8_t ReportID, - const void* ReportData, const uint16_t ReportSize); + bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize); + void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, + const void* ReportData, const uint16_t ReportSize); #endif diff --git a/Demos/Device/ClassDriver/Keyboard/Keyboard.c b/Demos/Device/ClassDriver/Keyboard/Keyboard.c index fb19d02d92..040aec453e 100644 --- a/Demos/Device/ClassDriver/Keyboard/Keyboard.c +++ b/Demos/Device/ClassDriver/Keyboard/Keyboard.c @@ -37,6 +37,9 @@ #include "Keyboard.h" +/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */ +uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)]; + /** LUFA HID Class driver interface configuration and state information. This structure is * passed to all HID Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. @@ -49,6 +52,9 @@ USB_ClassInfo_HID_Device_t Keyboard_HID_Interface = .ReportINEndpointNumber = KEYBOARD_EPNUM, .ReportINEndpointSize = KEYBOARD_EPSIZE, + + .PrevReportINBuffer = PrevKeyboardHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevKeyboardHIDReportBuffer), }, }; @@ -129,10 +135,12 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) * \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID * \param[out] ReportData Pointer to a buffer where the created report should be stored + * \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent * - * \return Number of bytes written in the report (or zero if no report is to be sent + * \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent */ -uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, void* ReportData) +bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize) { USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData; @@ -154,8 +162,9 @@ uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const H if (ButtonStatus_LCL & BUTTONS_BUTTON1) KeyboardReport->KeyCode[0] = 0x09; // F - - return sizeof(USB_KeyboardReport_Data_t); + + *ReportSize = sizeof(USB_KeyboardReport_Data_t); + return false; } /** HID class driver callback function for the processing of HID reports from the host. diff --git a/Demos/Device/ClassDriver/Keyboard/Keyboard.h b/Demos/Device/ClassDriver/Keyboard/Keyboard.h index 52b07ce609..4a28d20ff2 100644 --- a/Demos/Device/ClassDriver/Keyboard/Keyboard.h +++ b/Demos/Device/ClassDriver/Keyboard/Keyboard.h @@ -86,9 +86,9 @@ void EVENT_USB_ConfigurationChanged(void); void EVENT_USB_UnhandledControlPacket(void); - uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, - void* ReportData); - void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, - const void* ReportData, const uint16_t ReportSize); + bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize); + void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, + const void* ReportData, const uint16_t ReportSize); #endif diff --git a/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c b/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c index 418ccba4e4..abaf3808b1 100644 --- a/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c +++ b/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c @@ -37,6 +37,12 @@ #include "KeyboardMouse.h" +/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */ +uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)]; + +/** Buffer to hold the previously generated Mouse HID report, for comparison purposes inside the HID class driver. */ +uint8_t PrevMouseHIDReportBuffer[sizeof(USB_MouseReport_Data_t)]; + /** LUFA HID Class driver interface configuration and state information. This structure is * passed to all HID Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. This is for the keyboard HID @@ -50,6 +56,9 @@ USB_ClassInfo_HID_Device_t Keyboard_HID_Interface = .ReportINEndpointNumber = KEYBOARD_IN_EPNUM, .ReportINEndpointSize = HID_EPSIZE, + + .PrevReportINBuffer = PrevKeyboardHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevKeyboardHIDReportBuffer), }, }; @@ -66,6 +75,9 @@ USB_ClassInfo_HID_Device_t Mouse_HID_Interface = .ReportINEndpointNumber = MOUSE_IN_EPNUM, .ReportINEndpointSize = HID_EPSIZE, + + .PrevReportINBuffer = PrevMouseHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevMouseHIDReportBuffer), }, }; @@ -151,10 +163,12 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) * \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID * \param[out] ReportData Pointer to a buffer where the created report should be stored + * \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent * - * \return Number of bytes written in the report (or zero if no report is to be sent + * \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent */ -uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, void* ReportData) +bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize) { uint8_t JoyStatus_LCL = Joystick_GetStatus(); uint8_t ButtonStatus_LCL = Buttons_GetStatus(); @@ -179,8 +193,9 @@ uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const H if (JoyStatus_LCL & JOY_PRESS) KeyboardReport->KeyCode[0] = 0x08; // E - - return sizeof(USB_KeyboardReport_Data_t); + + *ReportSize = sizeof(USB_KeyboardReport_Data_t); + return false; } else { @@ -203,7 +218,8 @@ uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const H if (JoyStatus_LCL & JOY_PRESS) MouseReport->Button = (1 << 0); - return sizeof(USB_MouseReport_Data_t); + *ReportSize = sizeof(USB_MouseReport_Data_t); + return true; } } diff --git a/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.h b/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.h index a04051bb93..15532c8169 100644 --- a/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.h +++ b/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.h @@ -90,9 +90,9 @@ void EVENT_USB_ConfigurationChanged(void); void EVENT_USB_UnhandledControlPacket(void); - uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, - void* ReportData); - void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, - const void* ReportData, const uint16_t ReportSize); + bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize); + void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, + const void* ReportData, const uint16_t ReportSize); #endif diff --git a/Demos/Device/ClassDriver/Mouse/Mouse.c b/Demos/Device/ClassDriver/Mouse/Mouse.c index 51021c0f5f..08e87e672d 100644 --- a/Demos/Device/ClassDriver/Mouse/Mouse.c +++ b/Demos/Device/ClassDriver/Mouse/Mouse.c @@ -36,6 +36,9 @@ #include "Mouse.h" +/** Buffer to hold the previously generated Mouse HID report, for comparison purposes inside the HID class driver. */ +uint8_t PrevMouseHIDReportBuffer[sizeof(USB_MouseReport_Data_t)]; + /** LUFA HID Class driver interface configuration and state information. This structure is * passed to all HID Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. @@ -48,6 +51,9 @@ USB_ClassInfo_HID_Device_t Mouse_HID_Interface = .ReportINEndpointNumber = MOUSE_EPNUM, .ReportINEndpointSize = MOUSE_EPSIZE, + + .PrevReportINBuffer = PrevMouseHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevMouseHIDReportBuffer), }, }; @@ -128,10 +134,12 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) * \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID * \param[out] ReportData Pointer to a buffer where the created report should be stored + * \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent * - * \return Number of bytes written in the report (or zero if no report is to be sent + * \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent */ -uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, void* ReportData) +bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize) { USB_MouseReport_Data_t* MouseReport = (USB_MouseReport_Data_t*)ReportData; @@ -154,7 +162,8 @@ uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const H if (ButtonStatus_LCL & BUTTONS_BUTTON1) MouseReport->Button |= (1 << 1); - return sizeof(USB_MouseReport_Data_t); + *ReportSize = sizeof(USB_MouseReport_Data_t); + return true; } /** HID class driver callback function for the processing of HID reports from the host. diff --git a/Demos/Device/ClassDriver/Mouse/Mouse.h b/Demos/Device/ClassDriver/Mouse/Mouse.h index f134d92dc0..57e4a693dd 100644 --- a/Demos/Device/ClassDriver/Mouse/Mouse.h +++ b/Demos/Device/ClassDriver/Mouse/Mouse.h @@ -85,9 +85,9 @@ void EVENT_USB_ConfigurationChanged(void); void EVENT_USB_UnhandledControlPacket(void); - uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, - void* ReportData); - void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, - const void* ReportData, const uint16_t ReportSize); + bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize); + void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, + const void* ReportData, const uint16_t ReportSize); #endif diff --git a/LUFA/Drivers/USB/Class/Device/HID.c b/LUFA/Drivers/USB/Class/Device/HID.c index eef15f26cd..fbb45acd2a 100644 --- a/LUFA/Drivers/USB/Class/Device/HID.c +++ b/LUFA/Drivers/USB/Class/Device/HID.c @@ -51,15 +51,15 @@ void HID_Device_ProcessControlPacket(USB_ClassInfo_HID_Device_t* const HIDInterf { Endpoint_ClearSETUP(); - uint8_t ReportINData[HID_MAX_REPORT_SIZE]; uint16_t ReportINSize; uint8_t ReportID = (USB_ControlRequest.wValue & 0xFF); - memset(ReportINData, 0, sizeof(ReportINData)); + memset(HIDInterfaceInfo->Config.PrevReportINBuffer, 0, HIDInterfaceInfo->Config.PrevReportINBufferSize); - ReportINSize = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportINData); + CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, + HIDInterfaceInfo->Config.PrevReportINBuffer, &ReportINSize); - Endpoint_Write_Control_Stream_LE(ReportINData, ReportINSize); + Endpoint_Write_Control_Stream_LE(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize); Endpoint_ClearOUT(); } @@ -157,20 +157,20 @@ void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo) if (Endpoint_IsReadWriteAllowed()) { - uint8_t ReportINData[HID_MAX_REPORT_SIZE]; + uint8_t ReportINData[HIDInterfaceInfo->Config.PrevReportINBufferSize]; uint8_t ReportID = 0; uint16_t ReportINSize; memset(ReportINData, 0, sizeof(ReportINData)); - ReportINSize = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportINData); + bool ForceSend = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportINData, &ReportINSize); - bool StatesChanged = (memcmp(ReportINData, HIDInterfaceInfo->State.PreviousReportINData, ReportINSize) != 0); + bool StatesChanged = (memcmp(ReportINData, HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize) != 0); bool IdlePeriodElapsed = (HIDInterfaceInfo->State.IdleCount && !(HIDInterfaceInfo->State.IdleMSRemaining)); - memcpy(HIDInterfaceInfo->State.PreviousReportINData, ReportINData, ReportINSize); + memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINData, ReportINSize); - if (ReportINSize && (StatesChanged || IdlePeriodElapsed)) + if (ReportINSize && (ForceSend || StatesChanged || IdlePeriodElapsed)) { HIDInterfaceInfo->State.IdleMSRemaining = HIDInterfaceInfo->State.IdleCount; diff --git a/LUFA/Drivers/USB/Class/Device/HID.h b/LUFA/Drivers/USB/Class/Device/HID.h index 06456cf8ad..b8ca47980a 100644 --- a/LUFA/Drivers/USB/Class/Device/HID.h +++ b/LUFA/Drivers/USB/Class/Device/HID.h @@ -56,17 +56,6 @@ #endif /* Public Interface - May be used in end-application: */ - /* Macros: */ - #if !defined(HID_MAX_REPORT_SIZE) - /** Maximum size of an IN report which can be generated by the device and sent to the host, in bytes. - * - * \note If larger reports than the default specified here are to be generated by the device, this - * value can be overridden by defining this token to the required value in the project makefile - * and passing it to the compiler via the -D switch. - */ - #define HID_MAX_REPORT_SIZE 16 - #endif - /* Type Defines: */ /** Class state structure. An instance of this structure should be made for each HID interface * within the user application, and passed to each of the HID class driver functions as the @@ -80,6 +69,16 @@ uint8_t ReportINEndpointNumber; /**< Endpoint number of the HID interface's IN report endpoint */ uint16_t ReportINEndpointSize; /**< Size in bytes of the HID interface's IN report endpoint */ + + void* PrevReportINBuffer; /** Pointer to a buffer where the previously created HID input report can be + * stored by the driver, for comparison purposes to detect report changes that + * must be sent immediately to the host. This should point to a buffer big enough + * to hold the largest HID input report sent from the HID interface. + */ + uint8_t PrevReportINBufferSize; /** Size in bytes of the given input report buffer. This is used to create a + * second buffer of the same size within the driver so that subsequent reports + * can be compared. + */ } Config; /**< Config data for the USB class interface within the device. All elements in this section * must be set or the interface will fail to enumerate and operate correctly. */ @@ -89,8 +88,6 @@ uint16_t IdleCount; /**< Report idle period, in mS, set by the host */ uint16_t IdleMSRemaining; /**< Total number of mS remaining before the idle period elapsed - this should be * decremented by the user application if non-zero each millisecond */ - - uint8_t PreviousReportINData[HID_MAX_REPORT_SIZE]; /**< Previously generated report from the HID interface */ } State; /**< State data for the USB class interface within the device. All elements in this section * are reset to their defaults when the interface is enumerated. */ @@ -137,11 +134,14 @@ * be set to the report ID of the generated HID input report. If multiple reports are not sent via the * given HID interface, this parameter should be ignored. * \param[out] ReportData Pointer to a buffer where the generated HID report should be stored. + * \param[out] ReportSize Number of bytes in the generated input report, or zero if no report is to be sent * - * \return Number of bytes in the generated input report, or zero if no report is to be sent + * \return Boolean true to force the sending of the report even if it is identical to the previous report and still within + * the idle period (useful for devices which report relative movement), false otherwise */ - uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* HIDInterfaceInfo, uint8_t* ReportID, void* ReportData); - + bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize); + /** HID class driver callback for the user processing of a received HID input report. This callback may fire in response to * either HID class control requests from the host, or by the normal HID endpoint polling procedure. Inside this callback * the user is responsible for the processing of the received HID output report from the host. diff --git a/Projects/Magstripe/Magstripe.c b/Projects/Magstripe/Magstripe.c index 6d463d6a8d..f0fd8a7d0e 100644 --- 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. */ BitBuffer_t* CurrentTrackBuffer = &TrackDataBuffers[TOTAL_TRACKS]; +/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */ +uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)]; + /** LUFA HID Class driver interface configuration and state information. This structure is * passed to all HID Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. @@ -57,6 +60,9 @@ USB_ClassInfo_HID_Device_t Keyboard_HID_Interface = .ReportINEndpointNumber = KEYBOARD_EPNUM, .ReportINEndpointSize = KEYBOARD_EPSIZE, + + .PrevReportINBuffer = PrevKeyboardHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevKeyboardHIDReportBuffer), }, }; @@ -156,15 +162,17 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) HID_Device_MillisecondElapsed(&Keyboard_HID_Interface); } -/** HID Class driver callback function for the creation of a HID report for the host. +/** HID class driver callback function for the creation of HID reports to the host. * - * \param[in] HIDInterfaceInfo Pointer to the HID interface structure for the HID interface being referenced - * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID - * \param[out] ReportData Pointer to the preallocated report buffer where the created report should be stored + * \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced + * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID + * \param[out] ReportData Pointer to a buffer where the created report should be stored + * \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent * - * \return Number of bytes in the created report + * \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent */ -uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, void* ReportData) +bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize) { USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData; @@ -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; } - return sizeof(USB_KeyboardReport_Data_t); + *ReportSize = sizeof(USB_KeyboardReport_Data_t); + return false; } /** HID Class driver callback function for the processing of a received HID report from the host. diff --git a/Projects/Magstripe/Magstripe.h b/Projects/Magstripe/Magstripe.h index 4e0aac9797..279e3db2eb 100644 --- a/Projects/Magstripe/Magstripe.h +++ b/Projects/Magstripe/Magstripe.h @@ -85,9 +85,9 @@ void EVENT_USB_ConfigurationChanged(void); void EVENT_USB_UnhandledControlPacket(void); - uint16_t CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, - void* ReportData); - void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, - const void* ReportData, const uint16_t ReportSize); + bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID, + void* ReportData, uint16_t* ReportSize); + void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID, + const void* ReportData, const uint16_t ReportSize); #endif