Questions about Orgin Nano Dev Kit UART

[fishboneek]

Our company has grown an interest into Jetson Orgin Nano Developer Kit, but we still have some questions before purchasing.

On the hardware spec I see the UART “Device clock up to 68 MHz, baud rate of 4.25 Mbits/second.”. Does it mean the clock src and freq can be modified? We expect UART to operate at 2M/2.5M/3M, wonder if possible?

We also plan to use the UART on GPIO and M.2, since we need 2 UART instances for sensors and drives in our application (UART 2 on J14 is occupied for debugging). While GPIO one is usually seen on other development boards, M.2 is not. We plan to design our own M.2 Key E module to translate 1.8V to 3.3V, and expect the UART to operate at 2M/2.5M/3M too, is it also possible? Just asking to be sure.

Thanks!

[KevinFFF]

Hi fishboneek,

@fishboneek

On the hardware spec I see the UART “Device clock up to 68 MHz, baud rate of 4.25 Mbits/second.”. Does it mean the clock src and freq can be modified? We expect UART to operate at 2M/2.5M/3M, wonder if possible?

Yes, I believe 3M could be achieved.

@fishboneek

While GPIO one is usually seen on other development boards, M.2 is not. We plan to design our own M.2 Key E module to translate 1.8V to 3.3V, and expect the UART to operate at 2M/2.5M/3M too, is it also possible?

It sounds good to me to use the UART from 40-pins expansion header and M.2 Key E port for custom usage respectively.

You also can refer to https://elinux.org/Jetson/L4T/peripheral/#Mapping_3 for the UART mapping.

[fishboneek]

Thanks! Very helpful!