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Hi I notice this list has been very quite recently, so I hope someone is still out there? I am trying to write an interface in C so I can communicate with a PIC chip via USB using libhid, but I do not understand how to use the path information I am seeing to send and receive massages. This is the output I get when I run the example code that I downloaded from the libhid site. NOTICE: hid_find_usb_device(): found a matching USB device 004/003[0]. TRACE: hid_force_open(): claiming USB device 004/003[0]. NOTICE: hid_force_open(): successfully claimed USB device 004/003[0]. TRACE: hid_init_parser(): initialising the HID parser for USB Device 004/003[0]... TRACE: hid_init_parser(): allocating space for HIDData structure... TRACE: hid_init_parser(): successfully allocated memory for HIDData strcture. TRACE: hid_init_parser(): allocating space for HIDParser structure... TRACE: hid_init_parser(): successfully allocated memory for HIDParser strcture. NOTICE: hid_init_parser(): successfully initialised the HID parser for USB Device 004/003[0]. TRACE: hid_prepare_hid_descriptor(): initialising the HID descriptor for USB device 004/003[0]... TRACE: hid_prepare_hid_descriptor(): retrieving HID descriptor for USB device 004/003[0]... NOTICE: hid_prepare_hid_descriptor(): successfully initialised HID descriptor for USB device 004/003[0] (29 bytes). TRACE: hid_prepare_report_descriptor(): initialising the report descriptor for USB device 004/003[0]... TRACE: hid_prepare_report_descriptor(): retrieving report descriptor for USB device 004/003[0]... NOTICE: hid_prepare_report_descriptor(): successfully initialised report descriptor for USB device 004/003[0]. TRACE: hid_prepare_parser(): setting up the HID parser for USB device 004/003[0]... TRACE: hid_reset_parser(): resetting the HID parser for USB device 004/003[0]... TRACE: hid_prepare_parser(): dumping the raw report descriptor TRACE: hid_prepare_parser(): 0x000: 0x06 0x00 0xff 0x09 0x01 0xa1 0x01 0x19 TRACE: hid_prepare_parser(): 0x008: 0x01 0x29 0x40 0x15 0x00 0x26 0xff 0x00 TRACE: hid_prepare_parser(): 0x010: 0x75 0x08 0x95 0x40 0x81 0x00 0x19 0x01 TRACE: hid_prepare_parser(): 0x018: 0x29 0x40 0x91 0x00 0xc0 TRACE: hid_prepare_parser(): parsing the HID tree of USB device 004/003[0]... NOTICE: hid_prepare_parser(): successfully set up the HID parser for USB device 004/003[0]. NOTICE: hid_force_open(): successfully opened USB device 004/003[0]. device identification of HIDInterface 004/003[0]: dev_handle: 0x00a68ea0 device: 0x00a7c470 location: 004/003 manufacturer: Microchip Technology Inc. product: Simple HID Device Demo TRACE: hid_reset_parser(): resetting the HID parser for USB device 004/003[0]... TRACE: hid_dump_tree(): iterating the parse tree for USB device 004/003[0]... parse tree of HIDInterface 004/003[0]: path: 0xff000001.0x00000000; type: 0x80 {listed a total of 64 times} path: 0xff000001.0x00000000; type: 0x90 {listed a total of 64 times} TRACE: hid_reset_parser(): resetting the HID parser for USB device 004/003[0]... TRACE: hid_close(): closing USB device 004/003[0]... TRACE: hid_close(): closing handle of USB device 004/003[0]... NOTICE: hid_close(): successfully closed USB device 004/003[0]. TRACE: hid_reset_parser(): resetting the HID parser for USB device 004/003[0]... TRACE: hid_close(): freeing memory allocated for HID parser... TRACE: hid_close(): resetting HIDInterface... NOTICE: hid_cleanup(): successfully deinitialised HID library. I have tried the following code in an attempt to read some data: unsigned char const RECV_PACKET_LEN = 64; char packet[RECV_PACKET_LEN]; unsigned char const PATHLEN = 2; int const PATH_IN[2] = { 0xff000001, 0 }; int i; ret = hid_get_input_report(hid, PATH_IN, PATHLEN, packet, RECV_PACKET_LEN); if (ret != HID_RET_SUCCESS) { fprintf(stderr, "hid_get_input_report failed with return code %d\n", ret); } else { printf("data...\n"); for (i=0; i<RECV_PACKET_LEN; i++) printf("0x%02X ", (unsigned char) packet[i]); printf("\n"); } But it complains of a broken pipe..... TRACE: hid_reset_parser(): resetting the HID parser for USB device 004/003[0]... TRACE: hid_get_input_report(): looking up report ID... TRACE: hid_prepare_parse_path(): preparing search path of depth 2 for parse tree of USB device 004/003[0]... TRACE: hid_prepare_parse_path(): search path prepared for parse tree of USB device 004/003[0]. NOTICE: hid_find_object(): found requested item. TRACE: hid_get_input_report(): retrieving report ID 0x00 (length: 64) from USB device 004/003[0]... WARNING: hid_get_input_report(): failed to retrieve report from USB device 004/003[0]:error sending control message: Broken pipe. hid_get_input_report failed with return code 20 TRACE: hid_close(): closing USB device 004/003[0]... TRACE: hid_close(): closing handle of USB device 004/003[0]... NOTICE: hid_close(): successfully closed USB device 004/003[0]. TRACE: hid_reset_parser(): resetting the HID parser for USB device 004/003[0]... TRACE: hid_close(): freeing memory allocated for HID parser... TRACE: hid_close(): resetting HIDInterface... NOTICE: hid_cleanup(): successfully deinitialised HID library. This is the output I get from lsusb $ sudo lsusb -d 0x04d8:0x003f -vvv Bus 004 Device 003: ID 04d8:003f Microchip Technology, Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x04d8 Microchip Technology, Inc. idProduct 0x003f bcdDevice 0.02 iManufacturer 1 Microchip Technology Inc. iProduct 2 Simple HID Device Demo iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 41 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 No Subclass bInterfaceProtocol 0 None iInterface 0 ** UNRECOGNIZED: 09 21 11 01 00 01 22 1d 00 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 Device Status: 0x0001 Self Powered Can someone give me some pointers as I am a little stuck. Thanks Tim |
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