<p>cgminer's FPGA and ASIC support was originally taken from <a href="http://bfgminer.com" rel="nofollow">BFGMiner</a>. Due to the maintainers of GPU mining being upset over the obsoletion of GPU mining, they forked the project and eventually (poorly) rewrote the FPGA/ASIC drivers. You are seeing the effects of that.</p>

<p>BFGMiner continues to maintain the original (working) drivers, but you will need to remove the Zadig/WinUSB driver and install <a href="http://www.silabs.com/products/mcu/pages/usbtouartbridgevcpdrivers.aspx" rel="nofollow">the official CP210x driver</a> provided by Silabs. (CP210x is the chip used by the Block Erupters)</p>

CC BY-SA 3.0
2013-11-27T12:43:09.210Z
BfgMiner seems to require the `libusb` driver. On launch it gives the error `usb_devinfo_scan: Error opening device: LIBUSB_ERROR_NOT_SUPPORTED`
Ian Boyd
CC BY-SA 3.0
2013-11-28T13:04:04.927Z
Only for devices that speak raw USB, not block erupters.
Luke Dashjr
CC BY-SA 3.0
2013-11-21T07:37:18.957Z
2013-11-21T07:37:18.957Z
Luke Dashjr
<p>4.10.0 found my old asic usb miner</p>

CC BY-SA 3.0
2018-01-15T08:07:46.110Z
2018-01-15T08:07:46.110Z
Jere Nissinen
<p>I've been using <a href="http://ck.kolivas.org/apps/cgminer/3.4/" rel="nofollow noreferrer">CgMiner 3.4.1</a> since late September. It can see my four USB Block Erupters, and works:</p>

<pre><code> cgminer version 3.4.1 - Started: [2013-11-20 07:48:07]
--------------------------------------------------------------------------------
 (5s):1.223G (avg):978.4Mh/s | A:18  R:0  HW:1  WU:17.4/m
 ST: 2  SS: 0  NB: 1  LW: 37  GF: 0  RF: 0
 Connected to stratum.bitcoin.cz diff 3 with stratum as user joesmith
 Block: 00070bedfe64cbc8...  Diff:609M  Started: [07:48:07]  Best share: 124
--------------------------------------------------------------------------------
 [P]ool management [S]ettings [D]isplay options [Q]uit
 AMU 0:                | 307.2M/327.5Mh/s | A:12 R:0 HW:0 WU:10.0/m
 AMU 1:                | 267.8M/314.6Mh/s | A: 0 R:0 HW:0 WU: 2.5/m
 AMU 2:                | 280.3M/322.7Mh/s | A: 6 R:0 HW:0 WU: 3.7/m
 AMU 3:                | 127.4M/308.9Mh/s | A: 3 R:0 HW:1 WU:10.5/m
--------------------------------------------------------------------------------

 [2013-11-20 07:48:43] Accepted 1326b92d Diff 13/3 AMU 0
 [2013-11-20 07:48:47] Accepted 3e086003 Diff 4/3 AMU 0
 [2013-11-20 07:48:58] Accepted 487047eb Diff 3/3 AMU 3
</code></pre>

<p>But it <a href="https://bitcointalk.org/index.php?topic=28402.10980" rel="nofollow noreferrer">regularly crashes</a> <a href="https://bitcointalk.org/index.php?topic=28402.10960" rel="nofollow noreferrer">with a</a> <a href="https://bitcointalk.org/index.php?topic=28402.12395;wap" rel="nofollow noreferrer">stack overflow</a>. </p>

<p>About a month ago i tried to upgrade to <a href="http://ck.kolivas.org/apps/cgminer/3.6/" rel="nofollow noreferrer">CgMiner 3.6</a>, but it fails to find my USB devices:</p>

<pre><code> cgminer version 3.6.0 - Started: [2013-11-20 07:49:52]
--------------------------------------------------------------------------------
 (5s):0.000 (avg):0.000h/s | A:0  R:0  HW:0  WU:0.0/m
 ST: 2  SS: 0  NB: 1  LW: 2  GF: 0  RF: 0
 Connected to stratum.bitcoin.cz diff 3 with stratum as user joesmith
 Block: 00070bedfe64cbc8...  Diff:609M  Started: [07:49:52]  Best share: 0
--------------------------------------------------------------------------------
 [P]ool management [S]ettings [D]isplay options [Q]uit
--------------------------------------------------------------------------------

 [2013-11-20 07:49:49] Started cgminer 3.6.0
 [2013-11-20 07:49:49] Loaded configuration file cgminer.conf
 [2013-11-20 07:49:51] No devices detected!
 [2013-11-20 07:49:51] Waiting for USB hotplug devices or press q to quit
 [2013-11-20 07:49:51] Probing for an alive pool
 [2013-11-20 07:49:52] Pool 0 difficulty changed to 3
 [2013-11-20 07:49:52] Network diff set to 609M
</code></pre>

<p>So i reverted to <code>3.4.1</code>, living with the semi-daily crashes and having to remember to restart CgMiner. This morning i tested <a href="http://ck.kolivas.org/apps/cgminer/3.8/" rel="nofollow noreferrer">CgMiner 3.8</a>, hoping they fixed its inability to see USB Block Eruptors (and the stack overflow). Unfortunately it <em>still</em> does not see USB devices:</p>

<pre><code> cgminer version 3.8.0 - Started: [2013-11-20 07:44:46]
--------------------------------------------------------------------------------
 (5s):0.000 (avg):0.000h/s | A:0  R:0  HW:0  WU:0.0/m
 ST: 2  SS: 0  NB: 1  LW: 16  GF: 0  RF: 0
 Connected to stratum.bitcoin.cz diff 1 with stratum as user joesmith
 Block: 70bedfe6...  Diff:609M  Started: [07:44:46]  Best share: 0
--------------------------------------------------------------------------------
 [P]ool management [S]ettings [D]isplay options [Q]uit
--------------------------------------------------------------------------------

 [2013-11-20 07:44:42] Started cgminer 3.8.0
 [2013-11-20 07:44:42] Loaded configuration file cgminer.conf
 [2013-11-20 07:44:44] AMU 0 SendWork usb write err:(-7) LIBUSB_ERROR_TIMEOUT
 [2013-11-20 07:44:44] FAIL: USB get_lock not found (3:2)
 [2013-11-20 07:44:44] FAIL: USB remove not already in use (3:2)
 [2013-11-20 07:44:45] No devices detected!
 [2013-11-20 07:44:45] Waiting for USB hotplug devices or press q to quit
 [2013-11-20 07:44:45] Probing for an alive pool
 [2013-11-20 07:44:46] Pool 0 difficulty changed to 3
 [2013-11-20 07:44:46] Network diff set to 609M
 [2013-11-20 07:45:14] Pool 0 difficulty changed to 1
 [2013-11-20 07:45:14] Stratum from pool 0 requested work restart
 [2013-11-20 07:45:14] Stratum from pool 0 requested work restart
</code></pre>

<p>So i am, once again, reverted to CgMiner 3.4.1.</p>

<p>What did they break after CgMiner 3.4, and how do i fix it?</p>

<h1>WinUSB</h1>

<p>Just to preempt people who might suggest it, rather than offering any insight, i re-ran <a href="http://zadig.akeo.ie/" rel="nofollow noreferrer">zadiag</a> <a href="http://zadig.akeo.ie/downloads/zadig_v2.0.1.162.exe" rel="nofollow noreferrer">2.0.1.162</a> (Updated 11/20/2013), and <em>"reinstalled"</em> the <strong>WinUSB</strong> driver for my for USB devices (and rebooted)</p>

<p><img src="https://i.sstatic.net/4OXzD.png" alt="enter image description here"></p>

<p>No effect.</p>

<p>What is CgMiner 2.8 doing wrong that CgMiner 2.4 did right?</p>

<p><strong>Edit</strong>: Using Silicon Labs own VCP (Virtual COM Port driver):</p>

<p><img src="https://i.sstatic.net/QIgbV.png" alt="enter image description here"></p>

<p>gives the error (in BfgMiner):</p>

<pre><code>usb_devinfo_scan: Error opening device: LIBUSB_ERROR_NOT_SUPPORTED
</code></pre>

<p>In CgMiner it gives:</p>

<pre><code>USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 1:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:2
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:6
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:8
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:10
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:11
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:12
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:13
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 6:2
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 8:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 8:1
</code></pre>

<p>So i've changed it trying every driver with some of the miners. Three are using the <strong>libusb-win32</strong> driver, three are using the <strong>libusbx.org</strong> driver, and the rest are using the <strong>Silicon Labs CP210x USB to UART Bridge</strong> driver:</p>

<p><img src="https://i.sstatic.net/W0Vgp.png" alt="enter image description here"></p>

<p>Both <strong>CgMiner</strong> and <strong>BfgMiner</strong> detect no devices.</p>

<windows><cgminer><asic>
CgMiner past version 3.4 cannot see USB Block Eurptors (Windows)
Ian Boyd
# CgMiner past version 3.4 cannot see USB Block Eurptors (Windows)

(Asked by: username_0 on 2013-11-20)

I've been using CgMiner 3.4.1 since late September. It can see my four USB Block Erupters, and works:
 cgminer version 3.4.1 - Started: [2013-11-20 07:48:07]
--------------------------------------------------------------------------------
 (5s):1.223G (avg):978.4Mh/s | A:18  R:0  HW:1  WU:17.4/m
 ST: 2  SS: 0  NB: 1  LW: 37  GF: 0  RF: 0
 Connected to stratum.bitcoin.cz diff 3 with stratum as user joesmith
 Block: 00070bedfe64cbc8...  Diff:609M  Started: [07:48:07]  Best share: 124
--------------------------------------------------------------------------------
 [P]ool management [S]ettings [D]isplay options [Q]uit
 AMU 0:                | 307.2M/327.5Mh/s | A:12 R:0 HW:0 WU:10.0/m
 AMU 1:                | 267.8M/314.6Mh/s | A: 0 R:0 HW:0 WU: 2.5/m
 AMU 2:                | 280.3M/322.7Mh/s | A: 6 R:0 HW:0 WU: 3.7/m
 AMU 3:                | 127.4M/308.9Mh/s | A: 3 R:0 HW:1 WU:10.5/m
--------------------------------------------------------------------------------

 [2013-11-20 07:48:43] Accepted 1326b92d Diff 13/3 AMU 0
 [2013-11-20 07:48:47] Accepted 3e086003 Diff 4/3 AMU 0
 [2013-11-20 07:48:58] Accepted 487047eb Diff 3/3 AMU 3

But it regularly crashes with a stack overflow. 
About a month ago i tried to upgrade to CgMiner 3.6, but it fails to find my USB devices:
 cgminer version 3.6.0 - Started: [2013-11-20 07:49:52]
--------------------------------------------------------------------------------
 (5s):0.000 (avg):0.000h/s | A:0  R:0  HW:0  WU:0.0/m
 ST: 2  SS: 0  NB: 1  LW: 2  GF: 0  RF: 0
 Connected to stratum.bitcoin.cz diff 3 with stratum as user joesmith
 Block: 00070bedfe64cbc8...  Diff:609M  Started: [07:49:52]  Best share: 0
--------------------------------------------------------------------------------
 [P]ool management [S]ettings [D]isplay options [Q]uit
--------------------------------------------------------------------------------

 [2013-11-20 07:49:49] Started cgminer 3.6.0
 [2013-11-20 07:49:49] Loaded configuration file cgminer.conf
 [2013-11-20 07:49:51] No devices detected!
 [2013-11-20 07:49:51] Waiting for USB hotplug devices or press q to quit
 [2013-11-20 07:49:51] Probing for an alive pool
 [2013-11-20 07:49:52] Pool 0 difficulty changed to 3
 [2013-11-20 07:49:52] Network diff set to 609M

So i reverted to 3.4.1, living with the semi-daily crashes and having to remember to restart CgMiner. This morning i tested CgMiner 3.8, hoping they fixed its inability to see USB Block Eruptors (and the stack overflow). Unfortunately it still does not see USB devices:
 cgminer version 3.8.0 - Started: [2013-11-20 07:44:46]
--------------------------------------------------------------------------------
 (5s):0.000 (avg):0.000h/s | A:0  R:0  HW:0  WU:0.0/m
 ST: 2  SS: 0  NB: 1  LW: 16  GF: 0  RF: 0
 Connected to stratum.bitcoin.cz diff 1 with stratum as user joesmith
 Block: 70bedfe6...  Diff:609M  Started: [07:44:46]  Best share: 0
--------------------------------------------------------------------------------
 [P]ool management [S]ettings [D]isplay options [Q]uit
--------------------------------------------------------------------------------

 [2013-11-20 07:44:42] Started cgminer 3.8.0
 [2013-11-20 07:44:42] Loaded configuration file cgminer.conf
 [2013-11-20 07:44:44] AMU 0 SendWork usb write err:(-7) LIBUSB_ERROR_TIMEOUT
 [2013-11-20 07:44:44] FAIL: USB get_lock not found (3:2)
 [2013-11-20 07:44:44] FAIL: USB remove not already in use (3:2)
 [2013-11-20 07:44:45] No devices detected!
 [2013-11-20 07:44:45] Waiting for USB hotplug devices or press q to quit
 [2013-11-20 07:44:45] Probing for an alive pool
 [2013-11-20 07:44:46] Pool 0 difficulty changed to 3
 [2013-11-20 07:44:46] Network diff set to 609M
 [2013-11-20 07:45:14] Pool 0 difficulty changed to 1
 [2013-11-20 07:45:14] Stratum from pool 0 requested work restart
 [2013-11-20 07:45:14] Stratum from pool 0 requested work restart

So i am, once again, reverted to CgMiner 3.4.1.
What did they break after CgMiner 3.4, and how do i fix it?
WinUSB
Just to preempt people who might suggest it, rather than offering any insight, i re-ran zadiag 2.0.1.162 (Updated 11/20/2013), and "reinstalled" the WinUSB driver for my for USB devices (and rebooted)

No effect.
What is CgMiner 2.8 doing wrong that CgMiner 2.4 did right?
Edit: Using Silicon Labs own VCP (Virtual COM Port driver):

gives the error (in BfgMiner):
usb_devinfo_scan: Error opening device: LIBUSB_ERROR_NOT_SUPPORTED

In CgMiner it gives:
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 1:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:2
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:6
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:8
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:10
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:11
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:12
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 3:13
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 6:2
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 8:3
USB init, open device failed, err -12, you need to install a WinUSB driver for - AMU device 8:1

So i've changed it trying every driver with some of the miners. Three are using the libusb-win32 driver, three are using the libusbx.org driver, and the rest are using the Silicon Labs CP210x USB to UART Bridge driver:

Both CgMiner and BfgMiner detect no devices.

**Tags:** windows, cgminer, asic


---

## 2 answers

### Answer by username_1 on 2013-11-21. Score: 2

cgminer's FPGA and ASIC support was originally taken from [BFGMiner](http://bfgminer.com). Due to the maintainers of GPU mining being upset over the obsoletion of GPU mining, they forked the project and eventually (poorly) rewrote the FPGA/ASIC drivers. You are seeing the effects of that.

BFGMiner continues to maintain the original (working) drivers, but you will need to remove the Zadig/WinUSB driver and install [the official CP210x driver](http://www.silabs.com/products/mcu/pages/usbtouartbridgevcpdrivers.aspx) provided by Silabs. (CP210x is the chip used by the Block Erupters)

> **Comments:**
> **username_0**: BfgMiner seems to require the `libusb` driver. On launch it gives the error `usb_devinfo_scan: Error opening device: LIBUSB_ERROR_NOT_SUPPORTED`  
> **username_1**: Only for devices that speak raw USB, not block erupters.  

---

### Answer by username_2 on 2018-01-15. Score: -1

4.10.0 found my old asic usb miner


---

