can't download Oceanic VT3 on linux

[Hamish Moffatt]

On 11/03/14 00:52, Jef Driesen wrote:
>
> The slowness is expected. The attached patch introduces a 100ms delay 
> before each command. With 4096 packets (of only 16 bytes), that means 
> a total delay of at least 409.6 seconds. That alone is already a very 
> good reason not to apply this patch, especially because most users 
> don't need it. But it does give a good indication that the real 
> problem is likely something timing related. The question is of course 
> what and where.
>
> Something else that is worth trying is increasing the 100ms delay in 
> the oceanic_atom2_device_open() function. I don't really understand 
> why, but some interfaces seem to need some extra time between setting 
> up the serial port and sending the first data packet. I suspect that 
> the OS or driver is async and returns before the settings are actually 
> applied, causing us to send data before the device is ready. But I'm 
> not really sure about that. Anyway, adding some extra delay there 
> isn't that much of a problem because it's just a one time delay.
>
Increasing the delay in the oceanic_atom2_device_open() function didn't 
help (tried 1 second even). A delay of 1ms inside oceanic_atom2_send() 
was enough for a perfect transfer, but 0.5ms (via usleep() for hack's 
sake) was not enough.

Hamish