08-12-2022, 04:21 PM
1) For ”uart” troubles, it is recommended to check the circuit diagram.
2) PINE64 "Woodpecker".
The original 3.3V output signal was measured to be about 3.6V. This is beyond the acceptable range.
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As for PINE64 "Woodpecker", I purchased two of them about a year ago and have them on hand.
This is obviously strange.
In my experience, when two pieces have exactly the same symptoms, the whole lot is affected.
I'm not sure if the ones being sold now also have the same problem.
As far as the "Quartz64B" is concerned, uart's trouble is probably caused by the former (see schematic: improper level shifter design).
The latter is not desirable, but in the case of "Quartz64B" there will be no significant impact
However, in the case of Rcokpro64, it is dangerous because it exceeds the input maximum range.
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"Quartz64B", unfortunately due to delivery troubles, I still haven't received it, so I can't check it in person...
What the hell is going on ? at the recent "PINE64 Store".
2) PINE64 "Woodpecker".
The original 3.3V output signal was measured to be about 3.6V. This is beyond the acceptable range.
---
As for PINE64 "Woodpecker", I purchased two of them about a year ago and have them on hand.
This is obviously strange.
In my experience, when two pieces have exactly the same symptoms, the whole lot is affected.
I'm not sure if the ones being sold now also have the same problem.
As far as the "Quartz64B" is concerned, uart's trouble is probably caused by the former (see schematic: improper level shifter design).
The latter is not desirable, but in the case of "Quartz64B" there will be no significant impact
However, in the case of Rcokpro64, it is dangerous because it exceeds the input maximum range.
---
"Quartz64B", unfortunately due to delivery troubles, I still haven't received it, so I can't check it in person...
What the hell is going on ? at the recent "PINE64 Store".
