diff --git a/Downstream/.cproject b/Downstream/.cproject
index 2730d12..a64ae34 100644
--- a/Downstream/.cproject
+++ b/Downstream/.cproject
@@ -48,7 +48,7 @@
 							<builder autoBuildTarget="all" buildPath="${workspace_loc:/Downstream}/Debug" cleanBuildTarget="clean" command="${cross_make}" id="org.eclipse.cdt.build.core.internal.builder.1804403788" incrementalBuildTarget="all" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" superClass="org.eclipse.cdt.build.core.internal.builder"/>
 							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.789837881" name="Cross ARM GNU Assembler" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler">
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor.1524992420" name="Use preprocessor" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor" value="true" valueType="boolean"/>
-								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs.559716966" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs" valueType="definedSymbols">
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs.559716966" name="Defined symbols (-D)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="STM32F401xC"/>
 								</option>
 								<inputType id="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.input.1659311775" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.input"/>
@@ -61,6 +61,7 @@
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Drivers/CMSIS/Include}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Middlewares/ST/STM32_USB_Host_Library/Core/Inc}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/MSC/Inc}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Inc}&quot;"/>
 								</option>
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.defs.914524327" name="Defined symbols (-D)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.defs" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="STM32F401xC"/>
@@ -103,7 +104,7 @@
 						</toolChain>
 					</folderInfo>
 					<sourceEntries>
-						<entry excluding="Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c|Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_conf_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_sdmmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fsmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_wwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_usart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_spdifrx.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_smartcard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sdram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rng.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_qspi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pccard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nor.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nand.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_msp_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_ltdc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_irda.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_eth.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma2d.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cec.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_can.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc_ex.c" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
+						<entry excluding="Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid_keybd.c|Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid_mouse.c|Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid_parser.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c|Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_conf_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_sdmmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fsmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_wwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_usart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_spdifrx.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_smartcard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sdram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rng.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_qspi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pccard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nor.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nand.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_msp_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_ltdc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_irda.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_eth.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma2d.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cec.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_can.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc_ex.c" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
 					</sourceEntries>
 				</configuration>
 			</storageModule>
@@ -169,7 +170,7 @@
 							<builder autoBuildTarget="all" buildPath="${workspace_loc:/Downstream}/Release" cleanBuildTarget="clean" command="${cross_make}" id="org.eclipse.cdt.build.core.internal.builder.1921336679" incrementalBuildTarget="all" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" superClass="org.eclipse.cdt.build.core.internal.builder"/>
 							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.314526004" name="Cross ARM GNU Assembler" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler">
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor.2143421487" name="Use preprocessor" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor" value="true" valueType="boolean"/>
-								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs.1659712048" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs" valueType="definedSymbols">
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs.1659712048" name="Defined symbols (-D)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="STM32F401xC"/>
 								</option>
 								<inputType id="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.input.2143048963" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.input"/>
@@ -182,6 +183,7 @@
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Drivers/CMSIS/Include}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Middlewares/ST/STM32_USB_Host_Library/Core/Inc}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/MSC/Inc}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Inc}&quot;"/>
 								</option>
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.defs.569825136" name="Defined symbols (-D)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.defs" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="STM32F401xC"/>
@@ -223,7 +225,7 @@
 						</toolChain>
 					</folderInfo>
 					<sourceEntries>
-						<entry excluding="Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c|Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_conf_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_sdmmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fsmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_wwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_usart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_spdifrx.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_smartcard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sdram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rng.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_qspi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pccard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nor.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nand.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_msp_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_ltdc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_irda.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_eth.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma2d.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cec.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_can.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc_ex.c" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
+						<entry excluding="Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid_keybd.c|Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid_mouse.c|Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid_parser.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c|Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_conf_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_sdmmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fsmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fmc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_wwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_usart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_spdifrx.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_smartcard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sdram.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sai_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rng.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_qspi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pcd_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pccard.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nor.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_nand.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_msp_template.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_ltdc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_irda.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2s_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hash_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_fmpi2c_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_eth.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma2d.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dcmi_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cryp_ex.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cec.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_can.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc.c|Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc_ex.c" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
 					</sourceEntries>
 				</configuration>
 			</storageModule>
diff --git a/Downstream/.settings/org.eclipse.cdt.codan.core.prefs b/Downstream/.settings/org.eclipse.cdt.codan.core.prefs
index 77386c2..ff135cf 100644
--- a/Downstream/.settings/org.eclipse.cdt.codan.core.prefs
+++ b/Downstream/.settings/org.eclipse.cdt.codan.core.prefs
@@ -3,6 +3,10 @@ org.eclipse.cdt.codan.checkers.errnoreturn=Warning
 org.eclipse.cdt.codan.checkers.errnoreturn.params={launchModes\=>{RUN_ON_FULL_BUILD\=>true,RUN_ON_INC_BUILD\=>true,RUN_ON_FILE_OPEN\=>false,RUN_ON_FILE_SAVE\=>false,RUN_AS_YOU_TYPE\=>true,RUN_ON_DEMAND\=>true},implicit\=>false}
 org.eclipse.cdt.codan.checkers.errreturnvalue=Error
 org.eclipse.cdt.codan.checkers.errreturnvalue.params={launchModes\=>{RUN_ON_FULL_BUILD\=>true,RUN_ON_INC_BUILD\=>true,RUN_ON_FILE_OPEN\=>false,RUN_ON_FILE_SAVE\=>false,RUN_AS_YOU_TYPE\=>true,RUN_ON_DEMAND\=>true}}
+org.eclipse.cdt.codan.checkers.nocommentinside=-Error
+org.eclipse.cdt.codan.checkers.nocommentinside.params={launchModes\=>{RUN_ON_FULL_BUILD\=>true,RUN_ON_INC_BUILD\=>true,RUN_ON_FILE_OPEN\=>false,RUN_ON_FILE_SAVE\=>false,RUN_AS_YOU_TYPE\=>true,RUN_ON_DEMAND\=>true}}
+org.eclipse.cdt.codan.checkers.nolinecomment=-Error
+org.eclipse.cdt.codan.checkers.nolinecomment.params={launchModes\=>{RUN_ON_FULL_BUILD\=>true,RUN_ON_INC_BUILD\=>true,RUN_ON_FILE_OPEN\=>false,RUN_ON_FILE_SAVE\=>false,RUN_AS_YOU_TYPE\=>true,RUN_ON_DEMAND\=>true}}
 org.eclipse.cdt.codan.checkers.noreturn=Error
 org.eclipse.cdt.codan.checkers.noreturn.params={launchModes\=>{RUN_ON_FULL_BUILD\=>true,RUN_ON_INC_BUILD\=>true,RUN_ON_FILE_OPEN\=>false,RUN_ON_FILE_SAVE\=>false,RUN_AS_YOU_TYPE\=>true,RUN_ON_DEMAND\=>true},implicit\=>false}
 org.eclipse.cdt.codan.internal.checkers.AbstractClassCreation=Error
diff --git a/Downstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hcd.c b/Downstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hcd.c
index 1c26e4d..cb659bf 100644
--- a/Downstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hcd.c
+++ b/Downstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_hcd.c
@@ -879,11 +879,14 @@ static void HCD_HC_IN_IRQHandler(HCD_HandleTypeDef *hhcd, uint8_t chnum)
         hhcd->hc[chnum].urb_state = URB_NOTREADY;
       }
       
-      /* re-activate the channel  */
-      tmpreg = USBx_HC(chnum)->HCCHAR;
-      tmpreg &= ~USB_OTG_HCCHAR_CHDIS;
-      tmpreg |= USB_OTG_HCCHAR_CHENA;
-      USBx_HC(chnum)->HCCHAR = tmpreg;
+      if (hhcd->hc[chnum].ep_type != EP_TYPE_INTR)  //DON'T re-enable an interrupt-in transaction
+      {
+          /* re-activate the channel  */
+          tmpreg = USBx_HC(chnum)->HCCHAR;
+          tmpreg &= ~USB_OTG_HCCHAR_CHDIS;
+          tmpreg |= USB_OTG_HCCHAR_CHENA;
+          USBx_HC(chnum)->HCCHAR = tmpreg;
+      }
     }
     __HAL_HCD_CLEAR_HC_INT(chnum, USB_OTG_HCINT_CHH);
     HAL_HCD_HC_NotifyURBChange_Callback(hhcd, chnum, hhcd->hc[chnum].urb_state);
diff --git a/Downstream/Inc/downstream_interface_def.h b/Downstream/Inc/downstream_interface_def.h
index 435d6e8..b3dfaf2 100644
--- a/Downstream/Inc/downstream_interface_def.h
+++ b/Downstream/Inc/downstream_interface_def.h
@@ -15,7 +15,7 @@
 
 //***************
 // Attention!
-// Keep this file synchronised with downstream_interface_def.h
+// Keep this file synchronised with upstream_interface_def.h
 // in the Upstream project.
 //***************
 
@@ -29,6 +29,7 @@ typedef enum
 {
     COMMAND_CLASS_INTERFACE,
     COMMAND_CLASS_MASS_STORAGE,
+    COMMAND_CLASS_HID_MOUSE,
     //...
     COMMAND_CLASS_ERROR
 }
@@ -53,6 +54,13 @@ typedef enum
 InterfaceCommandMscTypeDef;
 
 
+typedef enum
+{
+    COMMAND_HID_REPORT,               //Downstream initiates HID report transfer to Upstream. Upstream just needs to Upstream_ReceivePacket each time.
+}
+InterfaceCommandHidTypeDef;
+
+
 typedef enum
 {
     COMMAND_ERROR_GENERIC,
diff --git a/Downstream/Inc/usbh_config.h b/Downstream/Inc/usbh_config.h
index a576fa4..59e70eb 100644
--- a/Downstream/Inc/usbh_config.h
+++ b/Downstream/Inc/usbh_config.h
@@ -62,13 +62,13 @@
 #define USBH_KEEP_CFG_DESCRIPTOR      1 
  
 /*----------   -----------*/
-#define USBH_MAX_NUM_SUPPORTED_CLASS      1 
+#define USBH_MAX_NUM_SUPPORTED_CLASS      2
  
 /*----------   -----------*/
 #define USBH_MAX_SIZE_CONFIGURATION      256 
  
 /*----------   -----------*/
-#define USBH_MAX_DATA_BUFFER      512 
+#define USBH_MAX_DATA_BUFFER      256       //was 512, string descriptors are max 255 bytes
  
 /*----------   -----------*/
 #define USBH_DEBUG_LEVEL      0 
diff --git a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Inc/usbh_hid.h b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Inc/usbh_hid.h
index 9d4bdd2..1f292f3 100644
--- a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Inc/usbh_hid.h
+++ b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Inc/usbh_hid.h
@@ -112,8 +112,8 @@ typedef enum
 {
   HID_INIT= 0,  
   HID_IDLE,
-  HID_SEND_DATA,
-  HID_BUSY,
+//  HID_SEND_DATA,
+//  HID_BUSY,
   HID_GET_DATA,   
   HID_SYNC,     
   HID_POLL,
@@ -227,9 +227,9 @@ typedef struct _HID_Process
   uint8_t              ep_addr;
   uint16_t             poll; 
   uint32_t             timer;
-  uint8_t              DataReady;
+//  uint8_t              DataReady;
   HID_DescTypeDef      HID_Desc;  
-  USBH_StatusTypeDef  ( * Init)(USBH_HandleTypeDef *phost);
+  //USBH_StatusTypeDef  ( * Init)(USBH_HandleTypeDef *phost);
 }
 HID_HandleTypeDef;
 
diff --git a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c
index 8b8ea93..972bf23 100644
--- a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c
+++ b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c
@@ -37,6 +37,8 @@
   * limitations under the License.
   *
   ******************************************************************************
+  *
+  * Modifications by Robert Fisk
   */
 
 /* Includes ------------------------------------------------------------------*/
@@ -105,8 +107,8 @@ static USBH_StatusTypeDef USBH_HID_Process(USBH_HandleTypeDef *phost);
 static USBH_StatusTypeDef USBH_HID_SOFProcess(USBH_HandleTypeDef *phost);
 static void  USBH_HID_ParseHIDDesc (HID_DescTypeDef *desc, uint8_t *buf);
 
-extern USBH_StatusTypeDef USBH_HID_MouseInit(USBH_HandleTypeDef *phost);
-extern USBH_StatusTypeDef USBH_HID_KeybdInit(USBH_HandleTypeDef *phost);
+//extern USBH_StatusTypeDef USBH_HID_MouseInit(USBH_HandleTypeDef *phost);
+//extern USBH_StatusTypeDef USBH_HID_KeybdInit(USBH_HandleTypeDef *phost);
 
 USBH_ClassTypeDef  HID_Class = 
 {
@@ -162,12 +164,12 @@ static USBH_StatusTypeDef USBH_HID_InterfaceInit (USBH_HandleTypeDef *phost)
     if(phost->device.CfgDesc.Itf_Desc[phost->device.current_interface].bInterfaceProtocol == HID_KEYBRD_BOOT_CODE)
     {
       USBH_UsrLog ("KeyBoard device found!"); 
-      HID_Handle->Init =  USBH_HID_KeybdInit;     
+      //HID_Handle->Init =  USBH_HID_KeybdInit;
     }
     else if(phost->device.CfgDesc.Itf_Desc[phost->device.current_interface].bInterfaceProtocol  == HID_MOUSE_BOOT_CODE)		  
     {
       USBH_UsrLog ("Mouse device found!");         
-      HID_Handle->Init =  USBH_HID_MouseInit;     
+      //HID_Handle->Init =  USBH_HID_MouseInit;
     }
     else
     {
@@ -296,22 +298,22 @@ static USBH_StatusTypeDef USBH_HID_ClassRequest(USBH_HandleTypeDef *phost)
     {
       
       USBH_HID_ParseHIDDesc(&HID_Handle->HID_Desc, phost->device.Data);
-      HID_Handle->ctl_state = HID_REQ_GET_REPORT_DESC;
+      HID_Handle->ctl_state = HID_REQ_SET_IDLE;     //HID_REQ_GET_REPORT_DESC;
     }
     
     break;     
-  case HID_REQ_GET_REPORT_DESC:
-    
-    
-    /* Get Report Desc */ 
-    if (USBH_HID_GetHIDReportDescriptor(phost, HID_Handle->HID_Desc.wItemLength) == USBH_OK)
-    {
-      /* The descriptor is available in phost->device.Data */
-
-      HID_Handle->ctl_state = HID_REQ_SET_IDLE;
-    }
-    
-    break;
+//  case HID_REQ_GET_REPORT_DESC:
+//
+//
+//    /* Get Report Desc */
+//    if (USBH_HID_GetHIDReportDescriptor(phost, HID_Handle->HID_Desc.wItemLength) == USBH_OK)
+//    {
+//      /* The descriptor is available in phost->device.Data */
+//
+//      HID_Handle->ctl_state = HID_REQ_SET_IDLE;
+//    }
+//
+//    break;
     
   case HID_REQ_SET_IDLE:
     
@@ -356,41 +358,41 @@ static USBH_StatusTypeDef USBH_HID_ClassRequest(USBH_HandleTypeDef *phost)
   */
 static USBH_StatusTypeDef USBH_HID_Process(USBH_HandleTypeDef *phost)
 {
-  USBH_StatusTypeDef status = USBH_OK;
+  USBH_URBStateTypeDef urbStatus;
   HID_HandleTypeDef *HID_Handle =  (HID_HandleTypeDef *) phost->pActiveClass->pData;
   
   switch (HID_Handle->state)
   {
   case HID_INIT:
-    HID_Handle->Init(phost); 
-  case HID_IDLE:
-    if(USBH_HID_GetReport (phost,
-                           0x01,
-                            0,
-                            HID_Handle->pData,
-                            HID_Handle->length) == USBH_OK)
-    {
-      
-      fifo_write(&HID_Handle->fifo, HID_Handle->pData, HID_Handle->length);  
-      HID_Handle->state = HID_SYNC;
-    }
-    
-    break;
+//    HID_Handle->Init(phost);
+      HID_Handle->pData = phost->device.Data;
+
+//  case HID_IDLE:
+//    if(USBH_HID_GetReport (phost,
+//                           0x01,
+//                            0,
+//                            HID_Handle->pData,
+//                            HID_Handle->length) == USBH_OK)
+//    {
+//
+//      fifo_write(&HID_Handle->fifo, HID_Handle->pData, HID_Handle->length);
+//      HID_Handle->state = HID_SYNC;
+//    }
+//
+//    break;
     
   case HID_SYNC:
-
     /* Sync with start of Even Frame */
+    //Uhhh, doesn't this sync with an odd frame?
+    //Also, do we need to sync at all?
+
     if(phost->Timer & 1)
     {
       HID_Handle->state = HID_GET_DATA; 
     }
-#if (USBH_USE_OS == 1)
-    osMessagePut ( phost->os_event, USBH_URB_EVENT, 0);
-#endif   
     break;
     
   case HID_GET_DATA:
-
     USBH_InterruptReceiveData(phost, 
                               HID_Handle->pData,
                               HID_Handle->length,
@@ -398,42 +400,43 @@ static USBH_StatusTypeDef USBH_HID_Process(USBH_HandleTypeDef *phost)
     
     HID_Handle->state = HID_POLL;
     HID_Handle->timer = phost->Timer;
-    HID_Handle->DataReady = 0;
     break;
     
   case HID_POLL:
+    urbStatus = USBH_LL_GetURBState(phost , HID_Handle->InPipe);
     
-    if(USBH_LL_GetURBState(phost , HID_Handle->InPipe) == USBH_URB_DONE)
+    if (urbStatus == USBH_URB_DONE)
     {
-      if(HID_Handle->DataReady == 0)
-      {
-        fifo_write(&HID_Handle->fifo, HID_Handle->pData, HID_Handle->length);
-        HID_Handle->DataReady = 1;
         USBH_HID_EventCallback(phost);
-#if (USBH_USE_OS == 1)
-    osMessagePut ( phost->os_event, USBH_URB_EVENT, 0);
-#endif          
-      }
+        HID_Handle->state = HID_IDLE;
+        break;
     }
-    else if(USBH_LL_GetURBState(phost , HID_Handle->InPipe) == USBH_URB_STALL) /* IN Endpoint Stalled */
+
+    if (urbStatus == USBH_URB_NOTREADY)
+    {
+        HID_Handle->state = HID_IDLE;
+        break;
+    }
+
+    if (urbStatus == USBH_URB_STALL)
     {
-      
       /* Issue Clear Feature on interrupt IN endpoint */ 
       if(USBH_ClrFeature(phost,
                          HID_Handle->ep_addr) == USBH_OK)
       {
-        /* Change state to issue next IN token */
-        HID_Handle->state = HID_GET_DATA;
+        HID_Handle->state = HID_IDLE;
       }
-    } 
-    
-
+    }
     break;
+
+  case HID_IDLE:
+      break;
+
     
   default:
     break;
   }
-  return status;
+  return USBH_OK;
 }
 
 /**
@@ -446,14 +449,11 @@ static USBH_StatusTypeDef USBH_HID_SOFProcess(USBH_HandleTypeDef *phost)
 {
   HID_HandleTypeDef *HID_Handle =  (HID_HandleTypeDef *) phost->pActiveClass->pData;
   
-  if(HID_Handle->state == HID_POLL)
+  if (HID_Handle->state == HID_IDLE)
   {
-    if(( phost->Timer - HID_Handle->timer) >= HID_Handle->poll)
+    if ((int32_t)(phost->Timer - HID_Handle->timer) >= HID_Handle->poll)
     {
       HID_Handle->state = HID_GET_DATA;
-#if (USBH_USE_OS == 1)
-    osMessagePut ( phost->os_event, USBH_URB_EVENT, 0);
-#endif       
     }
   }
   return USBH_OK;
diff --git a/Downstream/Src/downstream_statemachine.c b/Downstream/Src/downstream_statemachine.c
index d4482cd..75ea5b3 100644
--- a/Downstream/Src/downstream_statemachine.c
+++ b/Downstream/Src/downstream_statemachine.c
@@ -190,7 +190,7 @@ void Downstream_HostUserCallback(USBH_HandleTypeDef *phost, uint8_t id)
     }
 
     //Called from main()
-    if (id == HOST_USER_CLASS_ACTIVE)
+    if (id == HOST_USER_CLASS_SELECTED)
     {
         switch (phost->pActiveClass->ClassCode)
         {
diff --git a/Downstream/Src/usb_host.c b/Downstream/Src/usb_host.c
index 442eea1..5db673e 100644
--- a/Downstream/Src/usb_host.c
+++ b/Downstream/Src/usb_host.c
@@ -38,6 +38,7 @@
 #include "usb_host.h"
 #include "usbh_core.h"
 #include "usbh_msc.h"
+#include "usbh_hid.h"
 #include "downstream_statemachine.h"
 
 /* USB Host Core handle declaration */
@@ -51,6 +52,7 @@ void USB_Host_Init(void)
   USBH_Init(&hUsbHostFS, Downstream_HostUserCallback, HOST_FS);
 
   USBH_RegisterClass(&hUsbHostFS, USBH_MSC_CLASS);
+  USBH_RegisterClass(&hUsbHostFS, USBH_HID_CLASS);
 
   USBH_Start(&hUsbHostFS);
 }
diff --git a/Upstream/Inc/upstream_interface_def.h b/Upstream/Inc/upstream_interface_def.h
index d2366a6..f76a6df 100644
--- a/Upstream/Inc/upstream_interface_def.h
+++ b/Upstream/Inc/upstream_interface_def.h
@@ -58,7 +58,7 @@ InterfaceCommandMscTypeDef;
 
 typedef enum
 {
-  COMMAND_HID_REPORT,               //Downstream initiates HID report transfer to Upstream. Upstream just needs to Upstream_ReceivePacket each time.
+    COMMAND_HID_REPORT,               //Downstream initiates HID report transfer to Upstream. Upstream just needs to Upstream_ReceivePacket each time.
 }
 InterfaceCommandHidTypeDef;
 
diff --git a/Upstream/Src/upstream_hid.c b/Upstream/Src/upstream_hid.c
index cd7502f..6a48b2d 100644
--- a/Upstream/Src/upstream_hid.c
+++ b/Upstream/Src/upstream_hid.c
@@ -21,7 +21,7 @@
 
 
 
-InterfaceCommandClassTypeDef    ActiveHidClass = COMMAND_CLASS_INTERFACE;
+InterfaceCommandClassTypeDef    ActiveHidClass    = COMMAND_CLASS_INTERFACE;
 UpstreamPacketTypeDef*          UpstreamHidPacket = NULL;
 
 
@@ -37,7 +37,8 @@ void Upstream_HID_Init(InterfaceCommandClassTypeDef newClass)
         return;
     }
 
-    if (UpstreamHidPacket != NULL)
+    if ((ActiveHidClass != COMMAND_CLASS_INTERFACE) ||
+        (UpstreamHidPacket != NULL))
     {
         UPSTREAM_SPI_FREAKOUT;
         return;
@@ -81,7 +82,7 @@ void Upstream_HID_GetNextReport(UpstreamHidSendReportCallback callback)
 
 void Upstream_HID_GetNextReportReceiveCallback(UpstreamPacketTypeDef* receivedPacket)
 {
-    uint8_t reportLength;
+    uint8_t reportLength = 0;
 
     if (UpstreamHidPacket != NULL)
     {
@@ -111,7 +112,14 @@ void Upstream_HID_GetNextReportReceiveCallback(UpstreamPacketTypeDef* receivedPa
     //Other HID classes go here...
 
 
+    if (reportLength == 0)
+    {
+        UPSTREAM_SPI_FREAKOUT;
+        return;
+    }
+
     UpstreamHidPacket = receivedPacket;           //Save packet so we can free it when upstream USB transaction is done
     USBD_HID_SendReport(receivedPacket->Data, reportLength);
 }
 
+
diff --git a/Upstream/Src/upstream_statemachine.c b/Upstream/Src/upstream_statemachine.c
index 1f1fdbe..0b38360 100644
--- a/Upstream/Src/upstream_statemachine.c
+++ b/Upstream/Src/upstream_statemachine.c
@@ -176,11 +176,11 @@ void Upstream_StateMachine_NotifyDeviceReplyCallback(UpstreamPacketTypeDef* repl
         break;
 
     case COMMAND_CLASS_HID_MOUSE:
-      newActiveClass = COMMAND_CLASS_HID_MOUSE;
-      newClassPointer = &USBD_HID_Mouse;
-      break;
+        newActiveClass = COMMAND_CLASS_HID_MOUSE;
+        newClassPointer = &USBD_HID_Mouse;
+        break;
 
-    //Add other supported classes here...
+        //Add other supported classes here...
     }
 
     Upstream_ReleasePacket(replyPacket);