Building with the Soekris dam1121

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#666
I measured the two VCC5Ds.
one is about 150mA, the other is about 15-30mA
(see attachment)
pinout with current.png
 
#669
TNT said:
But not to lazy - measuring current is tiresome 🙂

This makes me want to try two different +5V for the VCC%Ds.

Thanks!

//

PS. Can you see any variation in current one either of them while playing audio?
Click to expand...

I might as well tell as you otherwise will never stop asking 🙂
one VCC5 (pin 2) is for the FPGA Core voltage DC-DC switcher, the other (pin 1) is for everything else, via the 3.3V lin regulator.

I don't see any big advantage by using two 5V regulators, but I have noticed that some people have different opinions here 🙂
 
#675
kenneth_obee said:
Yes.
I tried hundred times before (in dam1021 and dam1941), sometimes it works finally so I can upload firmware. But most of the time it failed. I never remember how to make it works.
Therefore I tend not to connect to uManager because I am lazy to try.
Click to expand...

The answers are in the thread. I once had brain fade (not for the first or last time) and took the easy way out and asked here. But it is a longish read if you’re in a hurry (or lazy🙂) and as I’ve just had that essential morning espresso....

Of course you know the 1121 interface is TTL. Like the isolated TX/RX on 1021. So a different PC-to-1121 interface is needed compared to good old RS-232 as used for the non-isolated connection on the 1021. But you know this.

From memory, with the communications software I’ve used (HyperTerminal), in my setup, YMMV depending on what you use, yadda, yadda I find it necessary to set the software to NOT append line feeds and NOT send line ends with line feeds under ASCII Setup.

Hope that eases the state you’re in....😀
 
#676
derekr said:
The answers are in the thread. I once had brain fade (not for the first or last time) and took the easy way out and asked here. But it is a longish read if you’re in a hurry (or lazy🙂) and as I’ve just had that essential morning espresso....

Of course you know the 1121 interface is TTL. Like the isolated TX/RX on 1021. So a different PC-to-1121 interface is needed compared to good old RS-232 as used for the non-isolated connection on the 1021. But you know this.

From memory, with the communications software I’ve used (HyperTerminal), in my setup, YMMV depending on what you use, yadda, yadda I find it necessary to set the software to NOT append line feeds and NOT send line ends with line feeds under ASCII Setup.

Hope that eases the state you’re in....😀
Click to expand...
Thanks for your big hint. Dam1021 has two kinds of connections available, one is non-isolated RS232, another is an isolated TTL.
 

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#679
yep i have tried all afternoon to get the serial to work, you' d think 3 wires would give you so much confusion. i must have it on the wrong pins. i have soldered:
pin 2=RXD
Pin 3=TXD
Pin 5= ground
with a null modem cable it worked with 1021!
 
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