can't download Oceanic VT3 on linux

Tue Mar 11 17:03:15 PDT 2014

On 12/03/14 00:27, Jef Driesen wrote:
>
> Even a sleep of just 1ms per packet is pretty bad. If I remember 
> correctly, the resolution of the Windows Sleep() function is in the 
> order of 10-15ms only. So that would still be a delay of approximately 
> 40.96 seconds.
>
> I wonder if this is another case where the tcdrain() function isn't 
> waiting properly until all bytes have been send out. We had a similar 
> problem with Suunto devices before. There we implemented a workaround 
> with serial_set_halfduplex() function. Could you try that as well? 
> Just call it somewhere in the oceanic_atom2_device_open() function, 
> but before the call to the oceanic_atom2_device_open() function.

I don't see any change.

> How many wires does the Oceanic interface have? Just two or more?

Three.

>
> I have been looking at the kernel history for the ftdi usb-serial 
> driver, and there have been some changes related to waiting until the 
> TX buffer is empty, so there could be something there as well. Which 
> kernel version do you have (uname -a)?

I had 3.2.54 but after reading Linus's email as well I upgraded to 
3.12.9 but I don't see any change there either. With regard to the FTDI 
latency issue you mentioned earlier, in 3.12.9 it seems the default is 
already set to the minimum:

$ cat /sys/bus/usb-serial/devices/ttyUSB0/latency_timer
1

> PS: Don't forget to attach the logfiles. I want to have a look at the 
> timings.
>

Here's it running with the half duplex change:

[0.000032] DATETIME 2014-03-11T23:50:21Z (1394581821)
[0.000055] VERSION 0.4.2
[0.000058] DEVICE=/dev/ttyUSB0
[0.000063] oceanic_atom2_device_open
[0.000854] INFO: Configure: baudrate=38400, databits=8, parity=0, 
stopbits=1, flowcontrol=0
[0.001001] INFO: Timeout: value=3000
[0.001011] INFO: Sleep: value=100
[0.101086] INFO: Flush: queue=3, input=0, output=0
[0.101478] INFO: Sleep: value=3
[0.104540] INFO: Write: size=2, data=8400
[0.104551] INFO: Read: size=1, data=5A
[0.106774] INFO: Read: size=17, data=4F43452056543320523244203531324BBF
[0.106785] dc_device_dump
[0.109560] INFO: Sleep: value=1
[0.110624] INFO: Write: size=4, data=B1000000
[0.110634] INFO: Read: size=1, data=A5
[0.110637] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[0.110639] INFO: Sleep: value=100
[0.210709] INFO: Flush: queue=1, input=0, output=0
[0.213559] INFO: Sleep: value=1
[0.214622] INFO: Write: size=4, data=B1000000
[0.214630] INFO: Read: size=1, data=5A
[0.223108] INFO: Read: size=17, data=0416041120081001425800730000000075
[0.225561] INFO: Sleep: value=1
[0.226626] INFO: Write: size=4, data=B1000100
[3.229650] INFO: Read: size=0, data=
[3.229662] ERROR: Failed to receive the answer. [in oceanic_atom2.c:333 
(oceanic_atom2_send)]
[3.229667] INFO: Sleep: value=100
[3.329737] INFO: Flush: queue=1, input=0, output=0
[3.333561] INFO: Write: size=4, data=B1000100
[3.333572] INFO: Read: size=1, data=5A
[3.342815] INFO: Read: size=17, data=6701DA064204E506E206DC06FF0FAAFBF6
[3.345590] INFO: Sleep: value=1
[3.346656] INFO: Write: size=4, data=B1000200
[3.346665] INFO: Read: size=1, data=A5
[3.346667] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[3.346670] INFO: Sleep: value=100
[3.446738] INFO: Flush: queue=1, input=0, output=0
[3.449561] INFO: Sleep: value=1
[3.450627] INFO: Write: size=4, data=B1000200
[3.450637] INFO: Read: size=1, data=5A
[3.459179] INFO: Read: size=17, data=0000DC06FF0FDC06FF0F00000000AA8A14
[3.461560] INFO: Sleep: value=1
[3.462625] INFO: Write: size=4, data=B1000300
[6.465647] INFO: Read: size=0, data=
[6.465658] ERROR: Failed to receive the answer. [in oceanic_atom2.c:333 
(oceanic_atom2_send)]
[6.465662] INFO: Sleep: value=100
[6.565732] INFO: Flush: queue=1, input=0, output=0
[6.569559] INFO: Write: size=4, data=B1000300
[6.569570] INFO: Read: size=1, data=5A
[6.578829] INFO: Read: size=17, data=890E370D00011B0B670542053250AAE1C2
[6.581562] INFO: Sleep: value=1
[6.582626] INFO: Write: size=4, data=B1000400
[6.582636] INFO: Read: size=1, data=A5
[6.582638] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[6.582640] INFO: Sleep: value=100
[6.682709] INFO: Flush: queue=1, input=0, output=0
[6.685558] INFO: Sleep: value=1
[6.686618] INFO: Write: size=4, data=B1000400
[6.686626] INFO: Read: size=1, data=5A
[6.695494] INFO: Read: size=17, data=300220028003500530BEB0BB0000000085
[6.697557] INFO: Sleep: value=1
[6.698616] INFO: Write: size=4, data=B1000500
[6.698622] INFO: Read: size=1, data=A5
[6.698623] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[6.698626] INFO: Sleep: value=100
[6.798693] INFO: Flush: queue=1, input=0, output=0
[6.801560] INFO: Sleep: value=1
[6.802626] INFO: Write: size=4, data=B1000500
[6.802636] INFO: Read: size=1, data=5A
[6.810993] INFO: Read: size=17, data=A014000300002C01980805A0022100024E
[6.813590] INFO: Sleep: value=1
[6.814656] INFO: Write: size=4, data=B1000600
[9.817693] INFO: Read: size=0, data=
[9.817717] ERROR: Failed to receive the answer. [in oceanic_atom2.c:333 
(oceanic_atom2_send)]
[9.817723] INFO: Sleep: value=100
[9.917791] INFO: Flush: queue=1, input=0, output=0
[9.921590] INFO: Write: size=4, data=B1000600
[9.921602] INFO: Read: size=1, data=5A
[9.930645] INFO: Read: size=17, data=3899000099003102E9050400000000008F
[9.933561] INFO: Sleep: value=1
[9.934620] INFO: Write: size=4, data=B1000700
[9.934626] INFO: Read: size=1, data=A5
[9.934628] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[9.934631] INFO: Sleep: value=100
[10.034727] INFO: Flush: queue=1, input=0, output=0
[10.037561] INFO: Sleep: value=1
[10.038626] INFO: Write: size=4, data=B1000700
[10.038637] INFO: Read: size=1, data=5A
[10.047154] INFO: Read: size=17, data=0906290000000000003C00000100000277
[10.049588] INFO: Sleep: value=1
[10.050663] INFO: Write: size=4, data=B1000800
[13.053576] INFO: Read: size=0, data=
[13.053592] ERROR: Failed to receive the answer. [in oceanic_atom2.c:333 
(oceanic_atom2_send)]
[13.053598] INFO: Sleep: value=100
[13.153679] INFO: Flush: queue=1, input=0, output=0
[13.157561] INFO: Write: size=4, data=B1000800
[13.157571] INFO: Read: size=1, data=5A
[13.166564] INFO: Read: size=17, data=A9A6C9AAAAAAAAAAAA0000000000000014
[13.169566] INFO: Sleep: value=1
[13.170625] INFO: Write: size=4, data=B1000900
[13.170632] INFO: Read: size=1, data=A5
[13.170634] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[13.170637] INFO: Sleep: value=100
[13.270704] INFO: Flush: queue=1, input=0, output=0
[13.273560] INFO: Sleep: value=1
[13.274626] INFO: Write: size=4, data=B1000900
[13.274636] INFO: Read: size=1, data=5A
[13.283203] INFO: Read: size=17, data=6400000300001400980805A00251000215
[13.285561] INFO: Sleep: value=1
[13.286626] INFO: Write: size=4, data=B1000A00
[16.289661] INFO: Read: size=0, data=
[16.289679] ERROR: Failed to receive the answer. [in oceanic_atom2.c:333 
(oceanic_atom2_send)]
[16.289693] INFO: Sleep: value=100
[16.389770] INFO: Flush: queue=1, input=0, output=0
[16.393579] INFO: Write: size=4, data=B1000A00
[16.393600] INFO: Read: size=1, data=5A
[16.402613] INFO: Read: size=17, data=0000000000000000000000000000000000
[16.405595] INFO: Sleep: value=1
[16.406670] INFO: Write: size=4, data=B1000B00
[16.406689] INFO: Read: size=1, data=A5
[16.406693] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[16.406698] INFO: Sleep: value=100
[16.506773] INFO: Flush: queue=1, input=0, output=0
[16.509576] INFO: Sleep: value=1
[16.510658] INFO: Write: size=4, data=B1000B00
[16.510680] INFO: Read: size=1, data=5A
[16.519117] INFO: Read: size=17, data=42056EA46350460014AA1001438348204F
[16.521562] INFO: Sleep: value=1
[16.522627] INFO: Write: size=4, data=B1000C00
[19.525664] INFO: Read: size=0, data=
[19.525683] ERROR: Failed to receive the answer. [in oceanic_atom2.c:333 
(oceanic_atom2_send)]
[19.525689] INFO: Sleep: value=100
[19.625760] INFO: Flush: queue=1, input=0, output=0
[19.629589] INFO: Write: size=4, data=B1000C00
[19.629601] INFO: Read: size=1, data=5A
[19.638596] INFO: Read: size=17, data=43142CA56F40510015AA541324064720DF
[19.641565] INFO: Sleep: value=1
[19.642636] INFO: Write: size=4, data=B1000D00
[19.642649] INFO: Read: size=1, data=A5
[19.642652] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[19.642658] INFO: Sleep: value=100
[19.742726] INFO: Flush: queue=1, input=0, output=0
[19.745589] INFO: Sleep: value=1
[19.746655] INFO: Write: size=4, data=B1000D00
[19.746665] INFO: Read: size=1, data=5A
[19.755186] INFO: Read: size=17, data=4414FEA35D40450015AA240440114D2080
[19.757560] INFO: Sleep: value=1
[19.758622] INFO: Write: size=4, data=B1000E00
[22.761642] INFO: Read: size=0, data=
[22.761653] ERROR: Failed to receive the answer. [in oceanic_atom2.c:333 
(oceanic_atom2_send)]
[22.761657] INFO: Sleep: value=100
[22.861725] INFO: Flush: queue=1, input=0, output=0
[22.865565] INFO: Write: size=4, data=B1000E00
[22.865575] INFO: Read: size=1, data=5A
[22.874812] INFO: Read: size=17, data=4524B9A46840450015AA530119824B20CC
[22.877568] INFO: Sleep: value=1
[22.878629] INFO: Write: size=4, data=B1000F00
[22.878635] INFO: Read: size=1, data=A5
[22.878637] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[22.878640] INFO: Sleep: value=100

Occasionally even the very first command (get version) fails. I have 
just the original 100 ms delay after open in now.

[0.000044] DATETIME 2014-03-12T00:00:24Z (1394582424)
[0.000075] VERSION 0.4.2
[0.000079] DEVICE=/dev/ttyUSB0
[0.000086] oceanic_atom2_device_open
[0.000793] INFO: Configure: baudrate=38400, databits=8, parity=0, 
stopbits=1, flowcontrol=0
[0.000993] INFO: Timeout: value=3000
[0.001001] INFO: Sleep: value=100
[0.101090] INFO: Flush: queue=3, input=263, output=0
[0.101407] INFO: Sleep: value=3
[0.104481] INFO: Write: size=2, data=8400
[0.104504] INFO: Read: size=1, data=00
[0.104508] ERROR: Unexpected answer start byte(s). [in 
oceanic_atom2.c:339 (oceanic_atom2_send)]
[0.104517] INFO: Sleep: value=100
[0.204588] INFO: Flush: queue=1, input=118, output=0
[0.204898] INFO: Sleep: value=3
[0.207960] INFO: Write: size=2, data=8400
[0.207970] INFO: Read: size=1, data=5A
[0.209921] INFO: Read: size=17, data=4F43452056543320523244203531324BBF
[0.209935] dc_device_dump

Hamish