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USB端点描述符bInterval的时间周期解释 - USB中文网
http://www.usbzh.com/article/detail-637.html#:~:text=bInterval%E4%B8%BA1%E3%80%82%20%E9%80%89%E6%8B%A9%E9%85%8D%E7%BD%AE%E5%90%8E%EF%BC%8C%E5%90%8C%E6%AD%A5%E7%AE%A1%E9%81%93%E7%9A%84MaximumPacketSize%E4%B8%BA1024%2A%20%282%2B1%29%3D3072%E4%B8%AA%E5%AD%97%E8%8A%82%EF%BC%882%E4%B8%AA%E9%A2%9D%E5%A4%96%E7%9A%84%20%E4%BA%8B%E5%8A%A1%20%EF%BC%89%EF%BC%8C%E6%89%80%E4%BB%A5%E8%BF%99%E6%A0%B7USB%E8%AE%BE%E5%A4%87%E7%AB%AF%E5%8F%AF%E4%BB%A5%E5%9C%A8%E6%AF%8F%E4%B8%AA%E5%BE%AE%E5%B8%A7%E4%B8%AD%E4%BC%A0%E8%BE%933072%E4%B8%AA%E5%AD%97%E8%8A%82%EF%BC%8C%E4%B8%80%E5%B8%A7%EF%BC%888%E4%B8%AA%E5%BE%AE%E5%B8%A7%EF%BC%89%E4%B8%AD%E4%BC%A0%E8%BE%933072%2A8%3D24576%E4%B8%AA%E5%AD%97%E8%8A%82%E3%80%82%20%E4%B8%8B%E5%9B%BE%E6%98%BE%E7%A4%BA%E4%BA%86%E4%B8%8D%E5%90%8C%E7%9A%84bInterval%E9%85%8D%E7%BD%AE%E5%9C%A8%E9%AB%98%E9%80%9F%20%E5%90%8C%E6%AD%A5%E4%BC%A0%E8%BE%93,%E4%B8%AD%E7%9A%84%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93%E9%A2%91%E7%8E%87%E3%80%82%20%E6%AF%8F%E4%B8%AA%E6%96%B9%E6%A0%BC%E4%BB%A3%E8%A1%A8%E4%B8%80%E4%B8%AA%E5%BE%AE%E5%B8%A7%20%E8%B6%85%E9%AB%98%E9%80%9F%E7%AB%AF%E7%82%B9%E7%9A%84%E5%90%8C%E6%AD%A5%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93%20%E5%AF%B9%E4%BA%8E%E4%B8%80%E4%B8%AA%E8%B6%85%E9%AB%98%E9%80%9F%E7%AB%AF%E7%82%B9%EF%BC%8C%E5%AE%83%E7%9A%84%E7%AB%AF%E7%82%B9%E7%89%B9%E6%80%A7%E4%B8%BA%EF%BC%9A%20wMaxPacketSize%E6%98%AF%201024%E3%80%82%20bMaxBurst%20%E6%98%AF15
How to choose bInterval in USB Audio 2.0 Standard AS ...
https://stackoverflow.com/questions/62377939/how-to-choose-binterval-in-usb-audio-2-0-standard-as-isochronous-audio-data-endp
I am implementing an USB audio input device (STM32 with two microphones), following the Universal Serial Bus Device Class Definition for Audio Devices, Release 2.0.. I want to use USB High Speed, not Full Speed. The Standard AS Isochronous Audio Data Endpoint Descriptor has the field bInterval.. How should I choose the value for bInterval?Can I use a …
What is bInterval?
https://microchipsupport.force.com/s/article/What-is-bInterval
Figure 1: USB Device Tree Viewer of bInterval Note: bInterval is located within the “Endpoint Descriptor” section of USB Device Tree Viewer.Also, note that the bInterval is 4ms in the image above. This image demonstrates how to locate and determine the bInterval value of your USB Hub/Device.
USB Audio and Composite Devices
https://chamod.net/USB-Audio-and-Composite-Devices/
The bInterval and wMaxPacketSize decides that bandwith. Simply put, host allocates bandwith to transfer wMaxPacketSize amount of data once every bInterval number of USB frames. (For Full-Speed USB this interval is 1 millisecond). For 16 bit 48kHz mono audio, the packet size will be 96bytes if bInterval is set to 1. Requests
usb: gadget: u_audio: fix calculations for small bInterval ...
If bInterval is 1, then p_interval is 8000 and p_interval_mil is 8E9, which is too big for a 32-bit value. While the storage is indeed 64-bit, this value is used as the divisor in do_div() which will truncate it into a uint32_t leading to incorrect calculated values. ... ("usb: gadget: u_audio.c: Adding Playback Pitch ctl for sync playback ...
LKML: John Keeping: [PATCH] usb: gadget: u_audio: fix ...
https://lkml.org/lkml/2022/1/4/845
Subject. [PATCH] usb: gadget: u_audio: fix calculations for small bInterval. Date. Tue, 4 Jan 2022 18:32:42 +0000. share 0. If bInterval is 1, then p_interval is 8000 and p_interval_mil is 8E9, which is too big for a 32-bit value. While the storage is indeed. 64-bit, this value is used as the divisor in do_div () which will.
USB端点描述符bInterval的时间周期解释 - USB中文网
http://www.usbzh.com/article/detail-637.html
bInterval为1。 选择配置后，同步管道的MaximumPacketSize为1024*(2+1)=3072个字节（2个额外的事务），所以这样USB设备端可以在每个微帧中传输3072个字节，一帧（8个微帧）中传输3072*8=24576个字节。 下图显示了不同的bInterval配置在高速同步传输中的数据传输频率。
'[PATCH] usb: gadget: u_audio: fix calculations for small ...
https://marc.info/?l=linux-usb&m=164132107818318
[prev in list] [next in list] [prev in thread] [next in thread] List: linux-usb Subject: [PATCH] usb: gadget: u_audio: fix calculations for small bInterval From: John Keeping <john metanate ! com> Date: 2022-01-04 18:32:42 Message-ID: 20220104183243.718258-1-john metanate ! com [Download RAW message or body] If bInterval is 1, then p_interval is 8000 and p_interval_mil is …
USB Audio 2.0 Drivers - Windows drivers | Microsoft Docs
https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/usb-2-0-audio-drivers
See the USB audio 2.0 specification for subclass types. USB Audio 2.0 Devices with MIDI (subclass 0x03 above) will enumerate the MIDI function as a separate multi-function device with usbaudio.sys (USB Audio 1.0 driver) loaded. The USB Audio 1.0 class driver registers this compatible ID with wdma_usb.inf. USB\Class_01 And has these exclusions:
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