Does DTM test use DTM rx or Uart?

jingfang · ‎02-09-2023

If i want DTM test, can I use 43 &44 ,only uart, or need use 46 &47 has DTM rx.

Gavin_Jia · ‎02-10-2023

Hope you are doing well.

I think using DTM_TX and DTM_RX will be okay.

For the operation of KW series boards for DMT, our colleagues have written a concise document. You can refer to this link: Direct Test Mode (DTM) Configurations for the KW family

If you have problems accessing this document, please don't hesitate to let me know and I will resend it to you.

B.R.

Gavin

jingfang · ‎02-10-2023

The document :

So I think uart it is ok, but I/O show DTM RX/TX,so I'm a little confused.

Gavin_Jia · ‎02-13-2023

Hi @jingfang ,

There are two ways to realize DTM test, one is through HCI, the other is through 2-wire uart interface. The documentation mentioned above is based on the 2-wire uart interface for testing.

The drivers used by DTM_Rx and DTM_Tx are also UART drivers. But multiplexing the GPIOs directly as DTM_Rx and DTM_Tx for DTM testing will eliminate possible problems later, and I can't guarantee that multiplexing as uart_tx/rx will still work.

B.R.

Gavin