Max throughput of LPC546xx MCU HS High Speed USB

Lex2 — Thu, 17 Apr 2025 05:45:32 GMT

Hi,
I am evaluating the dev LPCXpresso546xx board.
I am very interesting in high speed USB throughput of this dev board.
I am using dev_cdc_vcom_bm example code to evaluate the MCU.
I modified the example source code not to reply echo message in order to maximize USB OUT throughput(only for traffic from a host).
I measured the throughput by sending a binary file to /dev/ttyACMx.
Currently, I get the throughput is about 12.34MB/s(98.72Mbps). I need at least 24MB/s.
I wonder if a max throughput of this MCU is 12~15MB/s or not.
I wonder if there are some modification points to increase the throughput or not.

Thank you,
Lex

Re: Max throughput of LPC546xx MCU HS High Speed USB

Lex2 — Fri, 18 Apr 2025 13:46:50 GMT

I found a way which is very tricky. Finally I got about 37.5Mbytes/s(300Mbps).

I have to focus on the EndPoint buffer size. it should be 4Kbytes(This is a maximum I think in 8Kbytes USB SRAM).

And I have to work around the complicated interrupt handler codes.

This issue can be closed.

LPC MicrocontrollersのトピックMax throughput of LPC546xx MCU HS High Speed USB

Max throughput of LPC546xx MCU HS High Speed USB

Re: Max throughput of LPC546xx MCU HS High Speed USB