topic Re: What the highest transfer rate can be using USB1 as a vcom? in LPC Microcontrollers

What the highest transfer rate can be using USB1 as a vcom?

yanlong_gao — Wed, 12 Jun 2019 12:10:25 GMT

I was testing with the dev_cdc_vcom_bm example from MCUXpresso SDK, and an LPCXpresso54628 eval board.

I can configure the USB device worked in high-speed mode, and it's about 4MB/s when sending data to PC.

I want to know what the highest transfer rate can be, could it reach to 40MB/s as mentioned here https://community.nxp.com/message/760578

Re: What the highest transfer rate can be using USB1 as a vcom?

ZhangJennie — Thu, 13 Jun 2019 04:14:06 GMT

Hi will hunt

According to LPC546xx datasheet, USB1 speed can reach 480Mbit/s.

Have a great day,
Jun Zhang

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Re: What the highest transfer rate can be using USB1 as a vcom?

yanlong_gao — Fri, 14 Jun 2019 23:59:39 GMT

if I use the USB1 as a virtual com port, can that speed also be reached? and how?

Re: What the highest transfer rate can be using USB1 as a vcom?

ZhangJennie — Mon, 17 Jun 2019 06:19:34 GMT

Since you use USB1 as virtual com, the speed limitation is not on USB1 but your virtual com device.

What speed your virtual com device can reach?

Re: What the highest transfer rate can be using USB1 as a vcom?

yanlong_gao — Mon, 17 Jun 2019 08:03:39 GMT

What do you mean by virtual com device?

I am running the dev_cdc_vcom_bm example from SDK, the USB1 will be recognized as a virtual com port from the PC, LPC board send data through USB1 to PC, and PC read data through the virtual com port, the speed can reach to about 4MB/s.

My question is what's the highest speed can reach? some people said that could reach to 40MB/s, and that sounds reasonable since the high-speed USB can reach to a 480Mb/s about 60MB/s.

Re: What the highest transfer rate can be using USB1 as a vcom?

ZhangJennie — Tue, 18 Jun 2019 01:57:38 GMT

OK, understand.

In your case, the USB1 as virtual COM, the high-speed USB can reach to 480Mb/s.

Re: What the highest transfer rate can be using USB1 as a vcom?

yanlong_gao — Tue, 18 Jun 2019 07:02:11 GMT

OK, thanks.

Maybe I should change the title of this question to HOW to reach to 480Mb/s.

Re: What the highest transfer rate can be using USB1 as a vcom?

ZhangJennie — Tue, 18 Jun 2019 07:33:30 GMT

You are welcome!