Re: Troubleshooting ThumbDV HW AMBE chip with Analog_Bridge


David Ranch
 


Hello Steve,

Thanks for the reply. 

There are typically 2 issues with the ThumbDV on a RPi:
1: Power, The ThumbDV is very sensitive  to power drops See <https://dvswitch.groups.io/g/main/message/315?p=,,,20,0,0,0::relevance,,DV3000u,20,2,0,5521534>

Yes.. I saw that post.  This is currently being driven by a 5.1v @ 2.5A supply which should be good but I'll try others.

2: FTDI latency, as root:
    cat /sys/bus/usb-serial/devices/ttyUSB0/latency_timer
    If the result is greater then 1
    echo 1 > /sys/bus/usb-serial/devices/ttyUSB0/latency_timer

Ok, I have the following:
--
cat /sys/bus/usb-serial/devices/ttyUSB0/latency_timer
16
--

I'll change that down to 1 as recommended and I'll see what that does.

Beyond that, I assume the versions I'm running, the Analog_Bridge config and log output looks good?

--David
KI6ZHD

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