GL-MT300A technical specs

brother · 2016-04-07T06:48:44.000Z

Alfie-

Thanks for sending free card readers.

Please tell me the order of the headers for the serial connection, it does not seem to be labeled. And what is the hole next to the 3 serial headers- VBUS?

Are the packages for the card reader already installed on your firmware? Do you know what packages to install?

Thanks!

alzhao · 2016-04-07T17:40:21.000Z

@brother, for the headers, if not used as GPIO, I don’t think it needs to be labelled. But if you need, I need to ask the hardware engineer to give me one.

Do you mean the pin next to UART? it is 3.3V.

All the drivers for the card reader is in the firmware. If you insert MicroSD, it will be mounted automatically. One thing, when mounted, we use sync in the parameter. If you want faster speed, pls change to async.

brother · 2016-04-07T22:37:16.000Z

@alzhao,

Thanks, I see the markings on the UART now. I assume that we can power the device through the 3.3v ??

I was thinking about using the card reader with the OpenWrt trunk, (which I have tried, and it seems to work well)- the trunk probably doesn’t include the packages.

nccc · 2016-05-10T00:08:26.000Z

Is this UART full or Lite version, if this is lite version, where is the full version? Thanks.

alzhao · 2016-05-10T10:19:19.000Z

@nccc, I even don’t know what is the difference between full and lite version of UART. Can you explain?

nccc · 2016-05-10T22:56:46.000Z

From MT7620 datasheet, it is said that 7620N has one Lite UART, and 7620A has one Lite and one full UART separately, I want to know if the UART on the 7620A (GL-MT300A) is just the same lite UART as 7620N (GL-MT300N), or it is a real full UART. Or simply speaking, I want to know where is the two UART on the board respectviely, so that I can compare and study, thanks.

nccc · 2016-05-10T22:58:13.000Z

<span style=“color: #222222; font-family: source_sans_proregular, ‘Helvetica Neue’, Arial, Helvetica, Geneva, sans-serif; font-size: 14px; line-height: 22px; background-color: #f9f9f9;”>From MT7620 datasheet, it is said that 7620N has one Lite UART, and 7620A has one Lite and one full UART separately, I want to know if the UART on the 7620A (GL-MT300A is just the same lite UART as 7620N (GL-MT300N), or it is a real full UART. Or simply speaking, I want to know where is the two UART on the board respectviely, so that I can compare and study, thanks.</span>

alzhao · 2016-05-12T10:15:26.000Z

Ok. I understand now.

All the UART is just Lite version, i.e. 3 wires, GND, RX, TX. There are full UART on MT7620A but we don’t use them.

I still don’t know where the Full UART version can be used. My engineer just said it is more stable and errors. But the Lite version works just fine.

nccc · 2016-05-12T22:34:52.000Z

Thanks for your reply alzhao, we are currently using usb2serial , but we want to use UART directly expecting to be more stable. The lite and full version are very confusing, just very nervous on what will be missing if we use the Lite version instead of the full version. Can I expect the lite UART and the u2b2serial will be working similarly or any difference? The lite UART give you the feeling that there must be something missing.

nccc · 2016-05-12T22:45:45.000Z

“My engineer just said it is more stable and errors”, can you clarify if it is more stable and (more or less ?) errors? Thanks.

alzhao · 2016-05-13T09:47:17.000Z

I mean “Less” errors.

I think you have to try for your application. These Lite version UART is used everywhere because it is easy.