-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2009.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, and distribute this software\r
- and its documentation for any purpose and without fee is hereby\r
- granted, provided that the above copyright notice appear in all\r
- copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting\r
- documentation, and that the name of the author not be used in\r
- advertising or publicity pertaining to distribution of the\r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** \file\r
- *\r
- * Main source file for the MassStorageHost demo. This file contains the main tasks of\r
- * the demo and is responsible for the initial application hardware configuration.\r
- */\r
- \r
-#include "MassStorageHost.h"\r
-\r
-/** LUFA Mass Storage Class driver interface configuration and state information. This structure is\r
- * passed to all Mass Storage Class driver functions, so that multiple instances of the same class\r
- * within a device can be differentiated from one another.\r
- */\r
-USB_ClassInfo_MS_Host_t FlashDisk_MS_Interface =\r
- {\r
- .Config =\r
- {\r
- .DataINPipeNumber = 1,\r
- .DataOUTPipeNumber = 2,\r
- },\r
- };\r
-\r
- \r
-/** Main program entry point. This routine configures the hardware required by the application, then\r
- * starts the scheduler to run the application tasks.\r
- */\r
-int main(void)\r
-{\r
- SetupHardware();\r
-\r
- puts_P(PSTR(ESC_FG_CYAN "Mass Storage Host Demo running.\r\n" ESC_FG_WHITE));\r
-\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
-\r
- for (;;)\r
- {\r
- switch (USB_HostState)\r
- {\r
- case HOST_STATE_Addressed:\r
- LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
- \r
- uint16_t ConfigDescriptorSize;\r
- uint8_t ConfigDescriptorData[512];\r
-\r
- if ((USB_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, NULL) != HOST_SENDCONTROL_Successful) ||\r
- (ConfigDescriptorSize > sizeof(ConfigDescriptorData)) ||\r
- (USB_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData)))\r
- {\r
- printf("Error Retrieving Configuration Descriptor.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
-\r
- if (MS_Host_ConfigurePipes(&FlashDisk_MS_Interface,\r
- ConfigDescriptorSize, ConfigDescriptorData) != MS_ENUMERROR_NoError)\r
- {\r
- printf("Attached Device Not a Valid Mouse.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)\r
- {\r
- printf("Error Setting Device Configuration.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- printf("Mass Storage Device Enumerated.\r\n");\r
- USB_HostState = HOST_STATE_Configured;\r
- break;\r
- case HOST_STATE_Configured:\r
- LEDs_SetAllLEDs(LEDMASK_USB_BUSY);\r
- \r
- uint8_t MaxLUNIndex;\r
- if (MS_Host_GetMaxLUN(&FlashDisk_MS_Interface, &MaxLUNIndex))\r
- {\r
- printf("Error retrieving max LUN index.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- if (MS_Host_ResetMSInterface(&FlashDisk_MS_Interface))\r
- {\r
- printf("Error resetting Mass Storage interface.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- SCSI_Request_Sense_Response_t SenseData;\r
- if (MS_Host_RequestSense(&FlashDisk_MS_Interface, 0, &SenseData) != 0)\r
- {\r
- printf("Error retrieving device sense.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- if (MS_Host_PreventAllowMediumRemoval(&FlashDisk_MS_Interface, 0, true))\r
- {\r
- printf("Error setting Prevent Device Removal bit.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
-\r
- SCSI_Inquiry_Response_t InquiryData;\r
- if (MS_Host_GetInquiryData(&FlashDisk_MS_Interface, 0, &InquiryData))\r
- {\r
- printf("Error retreiving device Inquiry data.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break; \r
- }\r
-\r
- printf("Vendor \"%.8s\", Product \"%.16s\"\r\n", InquiryData.VendorID, InquiryData.ProductID);\r
- \r
- printf("Waiting until ready...\r\n");\r
-\r
- for (;;)\r
- {\r
- uint8_t ErrorCode = MS_Host_TestUnitReady(&FlashDisk_MS_Interface, 0);\r
- \r
- if (!(ErrorCode))\r
- break;\r
-\r
- /* Check if an error other than a logical command error (device busy) received */\r
- if (ErrorCode != MS_ERROR_LOGICAL_CMD_FAILED)\r
- {\r
- printf("Error waiting for device to be ready.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- }\r
-\r
- printf("Retrieving Capacity... ");\r
-\r
- SCSI_Capacity_t DiskCapacity;\r
- if (MS_Host_ReadDeviceCapacity(&FlashDisk_MS_Interface, 0, &DiskCapacity))\r
- {\r
- printf("Error retrieving device capacity.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- printf("%lu blocks of %lu bytes.\r\n", DiskCapacity.Blocks, DiskCapacity.BlockSize);\r
-\r
- uint8_t BlockBuffer[DiskCapacity.BlockSize];\r
-\r
- if (MS_Host_ReadDeviceBlocks(&FlashDisk_MS_Interface, 0, 0x00000000, 1, DiskCapacity.BlockSize, BlockBuffer))\r
- {\r
- printf("Error reading device block.\r\n");\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- printf("\r\nContents of first block:\r\n");\r
-\r
- for (uint16_t Chunk = 0; Chunk < (DiskCapacity.BlockSize >> 4); Chunk++)\r
- {\r
- uint8_t* ChunkPtr = &BlockBuffer[Chunk << 4];\r
- \r
- /* Print out the 16 bytes of the chunk in HEX format */\r
- for (uint8_t ByteOffset = 0; ByteOffset < (1 << 4); ByteOffset++)\r
- {\r
- char CurrByte = *(ChunkPtr + ByteOffset);\r
- printf_P(PSTR("%.2X "), CurrByte);\r
- }\r
- \r
- printf(" ");\r
-\r
- /* Print out the 16 bytes of the chunk in ASCII format */\r
- for (uint8_t ByteOffset = 0; ByteOffset < (1 << 4); ByteOffset++)\r
- {\r
- char CurrByte = *(ChunkPtr + ByteOffset);\r
- putchar(isprint(CurrByte) ? CurrByte : '.');\r
- }\r
- \r
- printf("\r\n");\r
- }\r
-\r
- LEDs_SetAllLEDs(LEDMASK_USB_READY);\r
- USB_HostState = HOST_STATE_WaitForDeviceRemoval;\r
- break;\r
- }\r
- \r
- MS_Host_USBTask(&FlashDisk_MS_Interface);\r
- USB_USBTask();\r
- }\r
-}\r
-\r
-/** Configures the board hardware and chip peripherals for the demo's functionality. */\r
-void SetupHardware(void)\r
-{\r
- /* Disable watchdog if enabled by bootloader/fuses */\r
- MCUSR &= ~(1 << WDRF);\r
- wdt_disable();\r
-\r
- /* Disable clock division */\r
- clock_prescale_set(clock_div_1);\r
-\r
- /* Hardware Initialization */\r
- SerialStream_Init(9600, false);\r
- LEDs_Init();\r
- USB_Init();\r
-}\r
-\r
-/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and\r
- * starts the library USB task to begin the enumeration and USB management process.\r
- */\r
-void EVENT_USB_Host_DeviceAttached(void)\r
-{\r
- puts_P(PSTR("Device Attached.\r\n"));\r
- LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
-}\r
-\r
-/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and\r
- * stops the library USB task management process.\r
- */\r
-void EVENT_USB_Host_DeviceUnattached(void)\r
-{\r
- puts_P(PSTR("\r\nDevice Unattached.\r\n"));\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
-}\r
-\r
-/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully\r
- * enumerated by the host and is now ready to be used by the application.\r
- */\r
-void EVENT_USB_Host_DeviceEnumerationComplete(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_READY);\r
-}\r
-\r
-/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */\r
-void EVENT_USB_Host_HostError(const uint8_t ErrorCode)\r
-{\r
- USB_ShutDown();\r
-\r
- printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"\r
- " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);\r
-\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
- for(;;);\r
-}\r
-\r
-/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while\r
- * enumerating an attached USB device.\r
- */\r
-void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode, const uint8_t SubErrorCode)\r
-{\r
- printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"\r
- " -- Error Code %d\r\n"\r
- " -- Sub Error Code %d\r\n"\r
- " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);\r
- \r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
-}\r
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2012.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Main source file for the MassStorageHost demo. This file contains the main tasks of
+ * the demo and is responsible for the initial application hardware configuration.
+ */
+
+#include "MassStorageHost.h"
+
+/** LUFA Mass Storage Class driver interface configuration and state information. This structure is
+ * passed to all Mass Storage Class driver functions, so that multiple instances of the same class
+ * within a device can be differentiated from one another.
+ */
+USB_ClassInfo_MS_Host_t FlashDisk_MS_Interface =
+ {
+ .Config =
+ {
+ .DataINPipeNumber = 1,
+ .DataINPipeDoubleBank = false,
+
+ .DataOUTPipeNumber = 2,
+ .DataOUTPipeDoubleBank = false,
+ },
+ };
+
+
+/** Main program entry point. This routine configures the hardware required by the application, then
+ * enters a loop to run the application tasks in sequence.
+ */
+int main(void)
+{
+ SetupHardware();
+
+ puts_P(PSTR(ESC_FG_CYAN "Mass Storage Host Demo running.\r\n" ESC_FG_WHITE));
+
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+ sei();
+
+ for (;;)
+ {
+ MassStorageHost_Task();
+
+ MS_Host_USBTask(&FlashDisk_MS_Interface);
+ USB_USBTask();
+ }
+}
+
+/** Configures the board hardware and chip peripherals for the demo's functionality. */
+void SetupHardware(void)
+{
+ /* Disable watchdog if enabled by bootloader/fuses */
+ MCUSR &= ~(1 << WDRF);
+ wdt_disable();
+
+ /* Disable clock division */
+ clock_prescale_set(clock_div_1);
+
+ /* Hardware Initialization */
+ Serial_Init(9600, false);
+ LEDs_Init();
+ USB_Init();
+
+ /* Create a stdio stream for the serial port for stdin and stdout */
+ Serial_CreateStream(NULL);
+}
+
+/** Task to manage an enumerated USB Mass Storage device once connected, to print out
+ * data from the device.
+ */
+void MassStorageHost_Task(void)
+{
+ if (USB_HostState != HOST_STATE_Configured)
+ return;
+
+ LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
+
+ puts_P(PSTR("Waiting until ready...\r\n"));
+
+ for (;;)
+ {
+ uint8_t ErrorCode = MS_Host_TestUnitReady(&FlashDisk_MS_Interface, 0);
+
+ if (!(ErrorCode))
+ break;
+
+ /* Check if an error other than a logical command error (device busy) received */
+ if (ErrorCode != MS_ERROR_LOGICAL_CMD_FAILED)
+ {
+ puts_P(PSTR("Error waiting for device to be ready.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+ }
+
+ puts_P(PSTR("Retrieving Capacity...\r\n"));
+
+ SCSI_Capacity_t DiskCapacity;
+ if (MS_Host_ReadDeviceCapacity(&FlashDisk_MS_Interface, 0, &DiskCapacity))
+ {
+ puts_P(PSTR("Error retrieving device capacity.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+
+ printf_P(PSTR("%lu blocks of %lu bytes.\r\n"), DiskCapacity.Blocks, DiskCapacity.BlockSize);
+
+ uint8_t BlockBuffer[DiskCapacity.BlockSize];
+
+ if (MS_Host_ReadDeviceBlocks(&FlashDisk_MS_Interface, 0, 0x00000000, 1, DiskCapacity.BlockSize, BlockBuffer))
+ {
+ puts_P(PSTR("Error reading device block.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+
+ puts_P(PSTR("\r\nContents of first block:\r\n"));
+
+ for (uint16_t Chunk = 0; Chunk < (DiskCapacity.BlockSize >> 4); Chunk++)
+ {
+ uint8_t* ChunkPtr = &BlockBuffer[Chunk << 4];
+
+ /* Print out the 16 bytes of the chunk in HEX format */
+ for (uint8_t ByteOffset = 0; ByteOffset < (1 << 4); ByteOffset++)
+ {
+ char CurrByte = *(ChunkPtr + ByteOffset);
+ printf_P(PSTR("%.2X "), CurrByte);
+ }
+
+ printf_P(PSTR(" "));
+
+ /* Print out the 16 bytes of the chunk in ASCII format */
+ for (uint8_t ByteOffset = 0; ByteOffset < (1 << 4); ByteOffset++)
+ {
+ char CurrByte = *(ChunkPtr + ByteOffset);
+ putchar(isprint(CurrByte) ? CurrByte : '.');
+ }
+
+ printf_P(PSTR("\r\n"));
+ }
+
+ LEDs_SetAllLEDs(LEDMASK_USB_READY);
+ USB_Host_SetDeviceConfiguration(0);
+}
+
+/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
+ * starts the library USB task to begin the enumeration and USB management process.
+ */
+void EVENT_USB_Host_DeviceAttached(void)
+{
+ puts_P(PSTR("Device Attached.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+}
+
+/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
+ * stops the library USB task management process.
+ */
+void EVENT_USB_Host_DeviceUnattached(void)
+{
+ puts_P(PSTR("\r\nDevice Unattached.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+}
+
+/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
+ * enumerated by the host and is now ready to be used by the application.
+ */
+void EVENT_USB_Host_DeviceEnumerationComplete(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+
+ uint16_t ConfigDescriptorSize;
+ uint8_t ConfigDescriptorData[512];
+
+ if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
+ sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
+ {
+ puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ return;
+ }
+
+ if (MS_Host_ConfigurePipes(&FlashDisk_MS_Interface,
+ ConfigDescriptorSize, ConfigDescriptorData) != MS_ENUMERROR_NoError)
+ {
+ puts_P(PSTR("Attached Device Not a Valid Mass Storage Device.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ return;
+ }
+
+ if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
+ {
+ puts_P(PSTR("Error Setting Device Configuration.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ return;
+ }
+
+ uint8_t MaxLUNIndex;
+ if (MS_Host_GetMaxLUN(&FlashDisk_MS_Interface, &MaxLUNIndex))
+ {
+ puts_P(PSTR("Error retrieving max LUN index.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+
+ printf_P(PSTR("Total LUNs: %d - Using first LUN in device.\r\n"), (MaxLUNIndex + 1));
+
+ if (MS_Host_ResetMSInterface(&FlashDisk_MS_Interface))
+ {
+ puts_P(PSTR("Error resetting Mass Storage interface.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+
+ SCSI_Request_Sense_Response_t SenseData;
+ if (MS_Host_RequestSense(&FlashDisk_MS_Interface, 0, &SenseData) != 0)
+ {
+ puts_P(PSTR("Error retrieving device sense.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+
+ if (MS_Host_PreventAllowMediumRemoval(&FlashDisk_MS_Interface, 0, true))
+ {
+ puts_P(PSTR("Error setting Prevent Device Removal bit.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+
+ SCSI_Inquiry_Response_t InquiryData;
+ if (MS_Host_GetInquiryData(&FlashDisk_MS_Interface, 0, &InquiryData))
+ {
+ puts_P(PSTR("Error retrieving device Inquiry data.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ USB_Host_SetDeviceConfiguration(0);
+ return;
+ }
+
+ printf_P(PSTR("Vendor \"%.8s\", Product \"%.16s\"\r\n"), InquiryData.VendorID, InquiryData.ProductID);
+
+ puts_P(PSTR("Mass Storage Device Enumerated.\r\n"));
+ LEDs_SetAllLEDs(LEDMASK_USB_READY);
+}
+
+/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
+void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
+{
+ USB_Disable();
+
+ printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
+ " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
+
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ for(;;);
+}
+
+/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
+ * enumerating an attached USB device.
+ */
+void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
+ const uint8_t SubErrorCode)
+{
+ printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
+ " -- Error Code %d\r\n"
+ " -- Sub Error Code %d\r\n"
+ " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
+
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+}
+
projects / pub / USBasp.git / blobdiff