Posted on January 31, 2012 at 13:25The problem is found, but there there is an eternal interrupt loop when NAK from device, so there is an another patch is required for the host lib, 'cause there is no wayto know when the device finished data transfer. Other stacks have a timeout feature for read/write, so the operation is aborted when the time is out.Does anybody know, is it possible to contact the USB Host Lib developers somehow? Do they answer in this forum?I'm trying to work with USB 3G modem using USB Host Library.There is a strange problem with USBH_BulkReceiveData function ---sometimes (probably then there is no data transfer from the USB device) the call of this function cause USB to lose synchronization an USB Host library to hung the firmware.Is there any safe way to call USBH_BulkReceiveData function? Or may be the way to determine when it's not safe to call it.I tried to call HCD_GetHCState function to get the transmission state, but it stuck to HC_XFRC forever after first call of USBH_BulkReceiveData.The USB session looks like
100981,14330299231375,USB,( OK ),OUT,e1 81 58
100982,14330299234708,USB,( OK ),DATA0,c3 41 54 49 0d 5c 62 100983,14330299240708,USB,( OK ),ACK,d2 100984,14330299242208,USB,( ),COLLAPSED [10 SOF]100985,14330309231041,USB,( OK ),OUT,e1 81 58100986,14330309234375,USB,( OK ),DATA1,4b 00 00100987,14330309237666,USB,( OK ),ACK,d2100988,14330309239166,USB,( ),COLLAPSED [2000 SOF] 100989,14332309497187,USB,( OK ),IN,69 01 c1100990,14332309500500,USB,( OK ),DATA0,c3 41 54 49 0d 5c 62100991,14332309506458,USB,( OK ),ACK,d2// READ FIRST CHUNK100994,14335809962416,USB,( OK ),IN,69 01 c1100995,14335809965708,USB,( OK ),DATA1,4b 0d 0a 4d 61 6e 75 66 61 63 74 75 72 65 72 3a 20 68 75 61 77 65 69 0d 0a 4d 6f 64 65 6c 3a 20 45 33 36 37 0d 0a 52 65 76 69 73 69 6f 6e 3a 20 31 31 2e 38 30 37 2e 30 35 2e 33 30 2e 32 30 39 0d 8d a7100996,14335810011666,USB,( OK ),ACK,d2 // READ NEXT CHUNK100999,14339310427833,USB,( OK ),IN,69 01 c1101000,14339310431125,USB,( OK ),DATA0,c3 0a 49 4d 45 49 3a 20 33 35 33 36 31 33 30 34 35 37 31 36 33 37 33 0d 0a 2b 47 43 41 50 3a 20 2b 43 47 53 4d 2c 2b 46 43 4c 41 53 53 2c 2b 44 53 0d 0a 0d 0a 4f 4b 0d 0a 77 17101001,14339310471750,USB,( OK ),ACK,d2 // BUS ERROR AND FIRMWARE CRASH01002,14339310473250,USB,( ),COLLAPSED [2000 SOF]101003,14341310983479,USB,( ),COLLAPSED [1730 SOF] [32779 IN/NAK]101004,14341310983479,USB,( ),COLLAPSED [1730 SOF] [32779 IN/NAK] <1 SYNC ERRORS>101005,14343041088770,USB,( OK ),IN,69 01 c1101006,14343041092041,USB,( BAD_SYNC; ),101007,14343041092041,USB,( ),<1 SYNC ERRORS>101008,14343041092791,USB,( BAD_SYNC; ),101009,14343041094020,USB,( OK ),NAK,5a 101010,14343041095520,USB,( ),COLLAPSED [1 SOF] [184 IN/NAK]101011,14343041095520,USB,( ),COLLAPSED [1 SOF] [184 IN/NAK] <1 SYNC ERRORS>Does anybody have any ideas how to read from BULK pipe safely?
