can't download Oceanic VT3 on linux

[Hamish Moffatt]

Sorry, sent that last one to Jef only by mistake.

On 13/03/14 00:52, Hamish Moffatt wrote:
>
> I'm starting to wonder if the dive computer needs that time and the 
> only reason it works on Windows and Mac is because the default latency 
> timer is higher which is adding that delay...
>
Aha. So, I increased the latency on linux (after first turning off the 
low_latency flag, which the driver sets by default):

# setserial  /dev/ttyUSB0 ^low_latency
# echo 16 > /sys/bus/usb-serial/devices/ttyUSB0/latency_timer

Now it works. With a value of 2 in there, it mostly works (glitches 
occasionally). Here's the timing:

[0.000026] DATETIME 2014-03-12T13:58:50Z (1394632730)
[0.000052] VERSION 0.5.0-devel (575f2e9016ac9baa2b1b031caa6fe0bc77cdbbee)
[0.000057] DEVICE=/dev/ttyUSB0
[0.000065] oceanic_atom2_device_open
[0.000073] INFO: Open: name=/dev/ttyUSB0
[0.000812] INFO: Configure: baudrate=38400, databits=8, parity=0, 
stopbits=1, flowcontrol=0
[0.000929] INFO: Timeout: value=3000
[0.000940] INFO: Sleep: value=100
[0.101016] INFO: Flush: queue=3, input=0, output=0
[0.101439] INFO: Write: size=1, data=84
[0.103600] INFO: Read: size=1, data=5A
[0.107599] INFO: Read: size=17, data=4F43452056543320523244203531324BBF
[0.107615] dc_device_dump
[0.108581] INFO: Write: size=3, data=B10000
[0.109599] INFO: Read: size=1, data=5A
[0.121477] INFO: Read: size=17, data=0416041120081001425800730000000075
[0.124581] INFO: Write: size=3, data=B10001
[0.124596] INFO: Read: size=1, data=5A
[0.135469] INFO: Read: size=17, data=6701DA064204E506E206DC06FF0FAAFBF6
[0.136583] INFO: Write: size=3, data=B10002
[0.137476] INFO: Read: size=1, data=5A
[0.149352] INFO: Read: size=17, data=0000DC06FF0FDC06FF0F00000000AA8A14
[0.152581] INFO: Write: size=3, data=B10003
[0.152595] INFO: Read: size=1, data=5A
[0.163354] INFO: Read: size=17, data=890E370D00011B0B670542053250AAE1C2
[0.164588] INFO: Write: size=3, data=B10004
[0.165312] INFO: Read: size=1, data=5A
[0.177359] INFO: Read: size=17, data=300220028003500530BEB0BB0000000085
[0.180580] INFO: Write: size=3, data=B10005
[0.180595] INFO: Read: size=1, data=5A
[0.191212] INFO: Read: size=17, data=A014000300002C01980805A0022100024E
[0.192580] INFO: Write: size=3, data=B10006
[0.193229] INFO: Read: size=1, data=5A

With a value of 4 it downloaded the whole memory dump with no errors.

Hamish