Author Topic: Ti DM368 UART interface can not communicate with computer, RX-TX short circuit?  (Read 789 times)

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Offline jason05Topic starter

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My gopro drone has this chip. When I use the UART interface for debugging, It may be that some two lines of RX, TX and GND were accidentally short-circuited during use , which may trigger some mechanism. Now the UART interface has no output information, so it is no longer possible to communicate with the computer.Is there any solution? thanks!!
 

Offline bson

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TMS320DM368, the DaVinci Media Processor?

Do you have an oscilloscope?  Probe the UART TX pin (or the signal downstream as it can be hard to probe a BGA) to see if it transmits.  If so it's not the UART but a buffer or driver.  In the old days RS-232 drivers were notoriously fragile.  If the UART is dead it's likely permanent.
 

Offline jason05Topic starter

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I don't have an oscilloscope . My drone still works, but the UART doesn't work. Can I fix it through other interfaces such as JTAG?
 

Offline jason05Topic starter

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I found a strange thing, when I short-circuited RX and TX there was an output, but the output content was a little repetitive and jumping, I suspect that there is a problem with a MOSFET used to control the RX and TX levels on the drone motherboard, or there is a problem with the signal control of the MOSFET, but there is no circuit schematics, there is no way to find the problem

https://www.mediafire.com/file/xvygb31n9r7sktl/ttl.txt/file
 


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