Xcore usb audio 2.0 driver windows 101/27/2024 For me, a good example of plug and play, is Analog Device's DSP range with SigmaStudio. I think that really depends how you look at this. indeed I am surprised that XMOS has never been considered. So, if I was asked to design something, I would use FGPAs in this case. At least with FPGAs there is a solid methodology enforcing discipline, and such discipline also includes the "formal verification" methodology for the all the involved HDL parts. Which is theoretically wrong, although it's proven to work (at least for hobbyists). Worse still, since modern computers have clock frequencies above 1Ghz, then this somehow is assumed "enforcing" the assumption that "there is enough time" to respect the 1msec deadline on the /dev/lpt port. The time deadline for a lot of mechanisms is about 1msec, and these things simply "work" without a solid feedback and assuming the deadline is 1msec which is "assumed" because someone has "measured" something on a DSO and found it respected in the worst case in a lab environment. I want to konw if you success, I also have this problem.I am surprised that big projects like "LinuxCNC" are still a thing made with a "dumb" (just a latch with some resistors and optocouplers) parallel port driver attached to a common PC running a RTAI/RT-patched vanilla-kernel rather than a PC interfaced via Ethernet (EtherCAT? AFDX?) to a standalone "black-box" internally made with an FPGA (for the hard real time stuff) coupled with a MPU for the miscellaneous services (for instance storing the CAM file, interfacing the FPGA to the remote computer by running TCP/IP, etc). If you want my HID setup, that was done on the TAS1020 decade ago but I could look it up and post it here if you are interested. I have never done this so I would not know if it works in all OS's. Table 6 Types of status interrupts that AppleUSBAudio supports and example device and Mac behavioįeature unit Volume and mute: User turns volume knob->Volume is updated in AMS and Sound Preferences UI Currently, AppleUSBAudio updates certain audio controls on the Mac for interrupts originating from Feature, Selector and Clock units as described in Table 6. This feedback maintains synchronization between the Mac’s user interface and the device state. Not sure if Windows or Linux supports this:Ī status interrupt pipe can be used to inform the host that a setting has changed on the device. I do remember the Apple USB Audio goddess reminding me there was another way, so I just looked it up. When someone hits say a key on your device you send the HID report which then comes down and changes the volume and everyone is happy. When experimenting with the HID-loop i found that i can probably get it to work like that, so i wont need to send absolute values, it just is a bit more fiddly.Įnable an HID with parameters to do volume up, down, mute, track control etc. We had to adjust the MIN and MAX volume in devicedefines.h like this to get the volume from windows to "show up" as the correct values when moving the slider on Windows/Mac. I have already modified the Volume range that the xmos communicates with windows so i get the 0-100 values when adjusting the windows slider, but now i am trying to get it to work the other way around. What i mean by absolute volume is that i want windows to be able to read this volume over USB somehow and adjust the slider in windows (which also shows 0-100) so that the volume on the product and in windows would be the same. Xmos just sends raw data via i2s and we do all the volume control further down the line. Our product has a volume range of 0-100 "%" totally independent of xmos. I have been looking more into endpoints and usb communications but i found it hard to start with. Possibly implement an interrupt endpoint to notify the host of a change?Ĭan you describe what you mean by absolute volume? You mean a multipiler (if so what format?) or a dB? Sure, you could close the loop using HID. Everything is host-centric and so the host is not expecting or checking the volume for device side changes. Infiniteimprobability wrote:The answer will probably be in the depths of the UAC2 spec but *I think* that what you are asking is not supported.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |