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楼主 #1 2020-04-09 09:59:09

aodzip
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注册时间: 2019-10-15
已发帖子: 130
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MT7601u rx urb failed: -71 解决方案

典型症状如下

[   85.238760] usb 1-1.4: new high-speed USB device number 35 using ehci-platform
[   85.418843] usb 1-1.4: New USB device found, idVendor=148f, idProduct=7601, bcdDevice= 0.00
[   85.427206] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   85.434540] usb 1-1.4: Product: 802.11 n WLAN
[   85.438909] usb 1-1.4: SerialNumber: 1.0
[   85.658773] usb 1-1.4: reset high-speed USB device number 35 using ehci-platform
[   85.711960] mt7601u 1-1.4:1.0: ASIC revision: 76010001 MAC revision: 76010500
[   85.720941] mt7601u 1-1.4:1.0: Firmware Version: 0.1.00 Build: 7640 Build time: 201302052146____
[   86.167971] mt7601u 1-1.4:1.0: EEPROM ver:0c fae:00
[   86.366367] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.371220] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.376970] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.386490] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.391620] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.397381] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.406739] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.411822] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.417575] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.426855] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.431907] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.437675] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.446980] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.452029] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.457789] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.463589] mt7601u 1-1.4:1.0: Error: mt7601u_mcu_wait_resp timed out
[   86.778760] mt7601u 1-1.4:1.0: Vendor request req:07 off:0080 failed:-71
[   87.088761] mt7601u 1-1.4:1.0: Vendor request req:02 off:0080 failed:-71
[   87.398756] mt7601u 1-1.4:1.0: Vendor request req:02 off:0080 failed:-71
[   87.405586] mt7601u: probe of 1-1.4:1.0 failed with error -110
[   87.420875] usb 1-1.4: USB disconnect, device number 35

解决方案
我跟你讲这芯片超耗电的
photo_2020-04-09_09-54-21.jpg
模块厂商会说这模块典型耗电110mA,相信的话就GG
2020-04-09%2009-57-51%20%E7%9A%84%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE.png
来看看MTK怎么说的
2020-04-09%2009-55-43%20%E7%9A%84%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE.png

加电容也许不是最好的办法,但是能稍微缓解(470uF)

还是换更好的供电吧,小LDO基本都秒杀了,按300mA的典型值设计吧

最近编辑记录 aodzip (2020-04-09 09:59:57)

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#2 2020-04-09 21:07:58

liuchangyin
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注册时间: 2020-03-17
已发帖子: 204
积分: 199

Re: MT7601u rx urb failed: -71 解决方案

手册都是实验室环境工况,实际环境肯定比手册上要耗电

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#3 2020-04-09 22:01:24

歌以咏志
会员
注册时间: 2019-09-21
已发帖子: 219
积分: 210

Re: MT7601u rx urb failed: -71 解决方案

好帖留名.

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