On 18 August 2014 06:48:27 Jaša Bartelj wrote: > Hi! Hi Jaša,
> I'm working on a student project where we are using SBCs (think > Raspberry Pi) with various devices. My assignment are fingerprint > readers and one of those is an Anviz U-Bio, formerly apparently also > known as OA99 (http://former.anviz.com/en/products/view.html?id=15). > > The unit is a desktop device with a USB interface. The optical sensor > within is called AFOS307, judging by their website it is also used in > many other of their devices. The SOC inside is STM32F105 R8T6 > (http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1031/LN1564/PF221021). > > Here's the Linux kernel messages at attachment: > [415414.469030] usb 6-1: new full-speed USB device number 6 using uhci_hcd > [415414.843056] usb 6-1: New USB device found, idVendor=0483, idProduct=5720 > [415414.843062] usb 6-1: New USB device strings: Mfr=1, Product=2, > SerialNumber=3 > [415414.843066] usb 6-1: Product: Mass Storage in FS Mode > [415414.843069] usb 6-1: Manufacturer: STMicroelectronics > [415414.843072] usb 6-1: SerialNumber: 00000000001B > [415414.852106] usb-storage 6-1:1.0: USB Mass Storage device detected > [415414.852407] scsi16 : usb-storage 6-1:1.0 > [415415.859110] scsi 16:0:0:0: CD-ROM ANVIZ Smart > 1.00 PQ: 0 ANSI: 0 CCS > [415415.864082] sr1: scsi3-mmc drive: 0x/0x caddy > [415415.864577] sr 16:0:0:0: Attached scsi CD-ROM sr1 > [415415.864819] sr 16:0:0:0: Attached scsi generic sg5 type 5 > > At first I had quite a bit of problems getting the reader to work with > their software but in the end found a Windows desktop application > which displayed an image. With USB capture I identified that the > device: > * class is 0x08 (USB Mass Storage), > * subclass is 0x06 (SCSI transparent command set) and > * the protocol is 0x50 (Bulk-Only Transport (BBB)) > The SCSI INQUIRY returns a SCSI Device Type 0x05. This is common for > CD-ROM Devices, and these use SCSI MMC commands. > > Here's the SCSI command reading loop that returns an image (numbers in hex): > 86000000000800020000 # 1) host sends SCSI CDB 0x86 Access Control In > f6002400000125f6 # SCSI Payload (8 B Request Data for CDB 0x86) # > device returns SCSI Status Good 0x00 for SCSI CDB 0x86 > 85000000000800020000 # 2) host sends SCSI CDB 0x85 > f6002494005eeef6 # SCSI Payload (8 B Response Data for CDB 0x85) > # device returns SCSI Status Good 0x00 for > SCSI CDB 0x86 > 85000000940100020000 # 3) host sends SCSI CDB 0x85 > [ 37889 B ] # SCSI Payload (37889 B Response Data for CDB > 0x85) # device returns SCSI Status Good 0x00 for SCSI CDB 0x86 > 85000000940200020000 # 4) host sends SCSI CDB 0x85 > [ 37890 B ] # SCSI Payload (37890 B Response Data for CDB > 0x85) # device returns SCSI Status Good 0x00 for SCSI CDB 0x86 > > The returned payload always has the first byte set to 0xF6, the rest > is image data, a 256x296 matrix of uint8. > > Here are my questions: > 1) Do you have any advice on how to figure out the meaning of the > neaning of the SCSI Payload of the first command? I have tried > analyzing the library the desktop app uses for access in IDA Pro Free > but I haven't gotten far yet. I'm afraid you have no other options than guess. > 2) My prototype reader script uses sg3_utils. For adding support to > libfprint I would ideally need a SCSI library to communicate with the > device. The only suitable seems to be the abandoned libusal > (http://web.archive.org/web/20140714024716/http://www.cdrkit.org/). Is > it possible to add a dependency to libfprint or should I support the > device with only libsusb? You can add another dependency, it would be an overkill to implement mass storage support with libusb. > Thanks for your response, other advice is also welcome! > > Jaša Regards Vasily > _______________________________________________ > fprint mailing list > fprint@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/fprint
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