USB to Serial connection loosing chars on Pi but not windows - Raspberry Pi Forums

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i have simple setup need talk debug port running @ 921600 baud collect error logs.

using rpi 3 running installed rasbian jessie (linux rpi-14-48-d5 4.9.35-v7+ #1014 smp fri jun 30 14:47:43 bst 2017 armv7l gnu/linux). hardware single cp210x silicon labs usb serial adapter , spi touchscreen. have wifi enabled , connected network not doing heavy network traffic @ time of fail. no other applications other standard gui, serial terminal software, , single ssh connection running during dump.

seeing few characters getting dropped randomly during dump. if slow down baud rate issue goes away. if leave @ 921600 baud , connect same usb dongle windows pc running hyperterm issue goes away.

assuming running sort of buffering issue here. have tried both minicom , cu eliminate sort of application issue. tried running cu "nice -n-20" no improvements.

ideas on else try fix dropped character issue? (just not sure go next)

thanks!

usb has been achilles heel of rpis.

if cp210x dongle has usb side plugged in rpi , other side of dongle connected 3.3 volt logic, try dispensing usb dongle , using serial in , out on pins on gpio header. don't know offhand maximum rate supports.


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