Hi again, (off-list now) Quer explicar em português os problemas ? O que você está tentando fazer e o que está dando errado ? regards On Wed, Sep 02, 2015 at 06:47:21PM -0500, Felipe Balbi wrote: > Hi, > > On Wed, Sep 02, 2015 at 08:12:19PM -0300, Rodolfo Labiapari Mansur wrote: > > Your answering a help wanted me doubt. I am developing a driver for > > communication with an FPGA. For communication I am using a UART > > converter that is making the USB converter of paper for serial. And > > which USB-to-UART converter would that be ? Most likely we already have > support for it in the kernel and if we do, it's far better that you read > the source code that's in place, than try to roll your own. If you want > to start learning kernel development, my suggestion would be spend time > on something else, rather than trying to solve something that was > already solved (in this USB-to-UART devices). > > > I'm doing my own driver this converter because I want to learn how to > > develop drivers. > > > > I followed the example usb-skel.c available on the internet. In my > > driver, I can recognize the converter device, get all your > > information. :) > > However, when we send data to the drive, the driver reports it was > > sent successfully but the converter does not receive. (I also tried > > what do you mean it "it was sent successfully but the converted does not > receive." ? Do you mean to say that a function returned zero ? Or that > the device returned you an ACK package > > > with Arduino and RS-232, but did not succeed). :( > > okay, so what happened there ? Have you tried usbmon ? (see > Documentation/usb/usbmon.txt from a kernel source tree for details) > > > So in the current situation, my driver informs that has been sent, but > > the device connected to the computer receives no signal. > > and how do you know it "received no signal" ? Which signal are you > talking about ? > > > My main question is: I need to 'start' communication before sending a > > package? For example, you would have to tell the device will start > > sending the package? Because it makes no sense I send my package, > > return success and the device does not receive anything. My driver > > needs to send pro device control signals warning that he wants to > > start data transmission? > > you need to figure out the protocol which your device talks. Sometimes > they just want raw data, but sometimes there's something else they need. > > Also, are you sending your data to the correct endpoints ? Grab some > usbmon traces, then it'll be easier to figure out what's going on. > > -- > balbi -- balbi
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