# USB Serial Port Driver max buffer length

**URL:** <https://community.solid-run.com/t/usb-serial-port-driver-max-buffer-length/382>\
**Category:** NXP i.MX8M Plus\
**Created:** [July 13, 2022, 2:08pm UTC](https://community.solid-run.com/t/usb-serial-port-driver-max-buffer-length/382 "2022-07-13T14:08:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Pablo1610](https://avatars.discourse-cdn.com/v4/letter/p/bc79bd/32.png) [@Pablo1610](https://community.solid-run.com/u/Pablo1610)\
**Post date:** [July 13, 2022, 2:08pm UTC](https://community.solid-run.com/t/usb-serial-port-driver-max-buffer-length/382/1 "2022-07-13T14:08:12Z")

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Hi everyone,

I was trying to read a json by one of the usb serial ports of the Hummingbird Pulse, but it seems to be cut the when I try to read it.

It looks like the reception buffer length its less than the json file. When I try to execute the python script in my computer, using pyserial library, it looks like great, but when I do it in the Pulse board, it appers to be cut in half.

It happens when the buffer its longer than 384 bytes, so it looks like its a driver library problem. I’m running debian in the Hummingboard.

Thanks,  
Pablo