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Showing results for tags 'USB'.
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So, Back a while ago I ordered some USB wings to play with, with just an USB 1.1 transceiver (TUSB1106PWR). Easy to solder. Only supports 12Mbit though, but the advantage is you can fit everything on a 8-bit wing. Jack actually did a demo of the PCB as an example for the 3D brd Viewer a while ago (you can watch it here: ). Since the transceiver is not actually a PHY, I've used a PHY from Opencores , with only some small modifications so I could use 96MHz as clock instead of the usual 48/60MHz. This PHY presents a UTMI interface which allows me to switch to a hard PHY in the future with minimal modifications. I then needed a packet decoder of some sort. I used  also from Opencores, and translated it (the packet decoder only) to VHDL (original is Verilog). This helps decode the PID from USB packets and perform CRC checks. Still a lot to go though. I then wrote a packet engine, that understands all important USB transactions, implements endpoint buffers and endpoint configuration. This took me a while, and required me to understand almost all of USB1.1 (with exception of hub transfers). Learned a lot. This packet engine is tied to a wishbone interface that goes directly into a ZPUino slot, so it can be controlled. All upper layer (descriptors, data transfer, so on) are handed in software, as typical microcontrollers do. Right now it works! The device can be enumerated, in Windows and Linux, and things look promising for the next days: [1547151.706742] usb 2-1.5: new full-speed USB device number 74 using ehci-pci[1547151.801847] usb 2-1.5: New USB device found, idVendor=efbe, idProduct=adde[1547151.801853] usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3[1547151.801856] usb 2-1.5: Product: USB Wing[1547151.801859] usb 2-1.5: Manufacturer: Alvie[1547151.801861] usb 2-1.5: SerialNumber: Rev 1.0[1547151.802582] cdc_acm 2-1.5:1.0: ttyACM0: USB ACM deviceStill needs a proper PID/VID though Another test was to present it as a CDC device, so we could use it as a serial port. Things are looking great too in that area, should be fully working tomorrow after some software changes. Lots of interrupts going on. I'll keep you posted Alvie  http://opencores.org/project,usb11_phy_translation  http://opencores.org/project,usb1_funct
Hello everyone. I am planning on making a simple usb capture device (I know they exist, but I want to do it myself), that can capture analog rgb video from scart. I know how to do this (I have 2 2 channel high speed adc's and a lm1881 sync separator), but before I begin, I want to be sure I can send the required amount of data over the usb. Using the serial on the papilio this is not possible, so I am considering buying an evaluation board for the FT232H high speed usb chip (UM232H). The required speed needs to be arround 35MByte/s for 24 bit rgb, but if needed I can lower it by using 16 bit instead. According to the datasheet of the FT232H, it should be able to do speeds up to 40MByte/s. My question is if this is possible with the FT232H. Or is there maybe another chip/evaluation board I can better use instead.
Hi all, I was enjoying playing successfully with a Papilio One 500K board, but after some unknown event (maybe trying a home-made wing that seemed OK?), my board is no longer recognized on the USB by my computer. Symptoms: when I plug the board on the computer, the Power LED is on, Power is supplied to the Wings supply pins (3.3V OK), but I no longer see the board from the computer. I tried even with low level tools, basically nothing is seen from the computer. Any idea how I could repair/debug this? (if this is even possible :-() Thanks, Jérôme