How to expand input buffer size of pyserial

python buffer pyserial
Ired picture Ired · Sep 6, 2012 · Viewed 15.3k times · Source

I want to communicate with the phone via serial port. After writing some command to phone, I used ser.read(ser.inWaiting()) to get its return value, but I always got total 1020 bytes of characters, and actually, the desired returns is supposed to be over 50KB.

I have tried to set ser.read(50000), but the interpreter will hang on.

How would I expand the input buffer to get all of the returns at once?

Answer

Valentyn picture Valentyn · Apr 25, 2018

If you run your code on Windows platform, you simply need to add a line in your code.

ser.set_buffer_size(rx_size = 12800, tx_size = 12800)

Where 12800 is an arbitrary number I chose. You can make receiving(rx) and transmitting(tx) buffer as big as 2147483647 (equal to 2^31 - 1)

this will allow you to expand the input buffer to get all of the returns at once.

Be aware that this will work only with some drivers since it is a recommendation. The driver might not take your recommendation and will stick with its' original buffer size.

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