nRF52 Tx Signal Present, Not seen out of virtual COM Port

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

Raj — Thu, 10 Mar 2016 18:44:53 GMT

Hi I am also facing the issue with nrf52 DK (PCA10040) board. when try same example (ble_app_uart) on nrf51 DK board (PC10028) it working properly. And also tried the examples/peripheral/uart project its also giving the same result. can any one help me to slove the issue.

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

Greg James — Sun, 14 Feb 2016 03:37:35 GMT

Hi I had the same problem . But by attaching a 100K pulll down resistor to P07 to ground the examples worked

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

Greg James — Fri, 12 Feb 2016 08:35:08 GMT

Hi I am having the same issue with the nrf52 development board. I have tried it on Windows 10 and a Linux board

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

ovrebekk — Mon, 16 Nov 2015 13:06:10 GMT

Could you try the uart example in the examples/peripheral folder, and see if you experience the same issue there?

Are you able to test this on a different PC?

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

tcbriese — Fri, 13 Nov 2015 21:09:15 GMT

Yeah, I'm not getting anywhere with the DTR signal. Not sure if the code running on the interface IC (ATSAM) is not detecting this correctly or what. I got RTT working for input/output, but it kind of stinks that the UART app doesn't just work out of the box on this kit.

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

Martijn — Fri, 13 Nov 2015 21:02:42 GMT

We had a similar problem with the nrf51 dk.. We needed to enable dtr to be able to receive data in our terminal application.. We couldn't receive any data in our case though..

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

tcbriese — Fri, 13 Nov 2015 17:33:52 GMT

I have tried it also. Are you running the ble_app_uart on the nRF52 device or some other board?

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

ovrebekk — Fri, 13 Nov 2015 17:27:29 GMT

Could you try a different terminal program? Personally I use Tera Term most of the time, and I have not had any issues with it when running the ble_app_uart example.

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

tcbriese — Fri, 13 Nov 2015 17:05:40 GMT

This doesn't fix it. It seems more like a problem with the ATSAM part to me. I am going to look for a low level COM port sniffer in Windows to see if anything is still coming through. I do get 1 to 4 characters through when the board is first powered on and Termite is "waiting to connect" (so a string varying in length from "S" to "Star"....see image I added above). I can also send data from Termite to the nRF part and then see it on my phone.

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

ovrebekk — Thu, 12 Nov 2015 10:37:05 GMT

Most likely this is an issue with the configuration of Termite. Make sure you have done the following:

Enable RTS/CTS flow control
Turn on the "Status LEDs" feature
Click on RTS and DTR in the main gui so that they light up

Best regards
Torbjørn

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

tcbriese — Mon, 09 Nov 2015 20:59:36 GMT

I am using 0.9.2 and loading a softdevice before programming. The BLE is working since I can send data in one direction (PC to phone)...For the other direction, I see data on the TX line coming out of the nRF52 part when the app boots and when I hit "Send" on the phone, but it doesn't make it through the VCP. Not sure why.

RE: nRF52 Tx Signal Present, Not seen out of virtual COM Port

JudePinto — Mon, 09 Nov 2015 20:46:47 GMT

which SDK are you using? are you programming the softdevice before flashing the code?