i never see any passengers when i play bus simulator 18

I never see any passengers when i play bus simulator 18 software#
I never see any passengers when i play bus simulator 18 Pc#

The return value is equal to the number of bytes requested, so no error is visible. Therefore, you cannot do without data toggle on the device side, anyway OHCI, UHCI and EHCI specs are linked in this USB.org page If the data sequence PID does not match the expected, the data is ignored, the transfer state is not advanced and this state is exited. If the PidCode indicates an IN, then any of following responses are expected: See section 8.6 of the USB specification for a more detailed description of Data Toggle Synchronization.Ĥ.12.1.2 Asynchronous - Do Complete Split The Data Toggle bit provides a 1-bit sequence number to check whether the previous packet completed. This bit determines which data PID is sent or expected (0=DATA0 and 1=DATA1). Data received when the data toggle mismatches is discarded and never written to host memory. The cause of a data toggle mismatch is either failure of the endpoint to receive an ACK or a broken device. It is guaranteed on each host controller spec, as follows.ĭata toggle mismatches on input data are counted as transmission errors.

I never see any passengers when i play bus simulator 18 software#

Of course if the USB device is perfect we should never see an error, but then if everything was always perfect the word 'error' wouldn't exist!!īy the way, please don't suggest that it's open-source software and I should just fix it myself - that's WAY beyond my ability!! The authors of libusb-win32 are doing a great job - it's appreciated.įirstly, host controllers follow the data toggle scheme for bulk and interrupt EPs as suggested on USB spec.

I never see any passengers when i play bus simulator 18 Pc#

So far as I can see, there is no way the PC can know there was a problem, and I think that's a poor scheme.Ĭouldn't the usb_bulk_read be written so that it gave an error if it just got an ACK but no data? Essentially I got some data and I can't tell it's rubbish. The return value is equal to the number ofīytes requested, so no error is visible. If a PC sends off a read request, so an IN setup packet, and the PIC firmware is wrong, what comes back is an ACK, and a lot of rubbish in the array that was to collect the data.

Hello again! I think I have understood the Data Toggle scheme, but I am having trouble more at a conceptual The symptom is often that the program works the first time and the second time the program will fail. For example, under Linux, especially for some kernel version, the device may not proper handle set_interface command and the interaction between the kernel and the device firmware will cause data toggle problem. The OS sometimes matters because of this. Yes the problem is that the data get silently dropped. After the next packet, data toggle is synchronized and no data drop occurs. When a device sends a packet in wrong data toggle for IN transaction, host returns ACK to the transaction, but the data is ignored. It doesn't depend on PC device driver, host app, or even OS. On the host side, data toggle is handled automatically by host controller.