nRF52 uart problems with errors 4 and 8

RE: nRF52 uart problems with errors 4 and 8

mbozic — Mon, 28 Aug 2017 12:16:58 GMT

Dropped this project, rewrote code on DK, uart works.

RE: nRF52 uart problems with errors 4 and 8

mbozic — Mon, 21 Aug 2017 08:05:03 GMT

Ble UART example is not working for me at the moment, it stops at Segger_RTT.c at line 304: p->aDown[0].WrOff = 0u; RTT version is 6.16j. For default version of Segger RTT which comes with SDK, code hangs at line number 187. Tried to disable RTT but then it stops at SD initialization, which is weird. Anyways, we'll probably just change PCBs and use some other pins which are not 0 and 1, which will solve our problem.

RE: nRF52 uart problems with errors 4 and 8

mbozic — Fri, 18 Aug 2017 13:25:17 GMT

Managed to get it working on pins 23 and 24! Still no luck on 0 and 1. Which UART example? ble_uart or uart without ble? I can try them, sure, but loopback will work if there are bytes sent/received, and I can't get that to work on pins 0 and 1.

RE: nRF52 uart problems with errors 4 and 8

FormerMember — Wed, 02 Aug 2017 11:32:25 GMT

When I test using UART on pin 0 and 1 here it works without any problems. Could you run the UART example in the SDK --> ENABLE_LOOPBACK_TEST and check if it works if the RX/TX pins are set to 0 and 1?

RE: nRF52 uart problems with errors 4 and 8

mbozic — Fri, 28 Jul 2017 12:40:25 GMT

Still nothing. I've managed to add Segger RTT to logging @ template project. After that I added UART stuff from UART ble example. When pins 0 and 1 are used for UART I still get error 4 and 8. When using pins 23 and 24 no such errors. In both cases I don't have a working UART. I't not sending anything. I can compile the program and run it, there are no compile errors or execution errors, but when using "app_uart_put" function I get nothing out.

RE: nRF52 uart problems with errors 4 and 8

mbozic — Thu, 27 Jul 2017 12:21:24 GMT

Nope, nothing on pins 0 and 1. Must something be configured before I can use them as tx, rx for uart?

RE: nRF52 uart problems with errors 4 and 8

mbozic — Thu, 27 Jul 2017 10:02:18 GMT

I don't have, but I must check in Rigado datasheet, maybe they do, hmmm... Just a note, when I tried to use pin 23 and 24 I don't get those errors.

You mean like this? nrf_clock_lf_cfg_t clock_lf_cfg = { NRF_CLOCK_LF_SRC_RC, 16, 2, 0 }; SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL); That's the code I use from the beginning.

RE: nRF52 uart problems with errors 4 and 8

FormerMember — Thu, 27 Jul 2017 09:40:08 GMT

If there is no 32 kHz crystal connected to pin 0 and 1, there shouldn't be any problem to use those pins as GPIOs.

In your code, do you have set the LFCLK crystal source to the internal RC oscillator? If not, could you do so, and check if it changes anything?

RE: nRF52 uart problems with errors 4 and 8

mbozic — Wed, 26 Jul 2017 11:37:27 GMT

Btw, my UART pins are pins 0 and 1. Those are XL1 and XL2. Maybe that's the issue? Must I reconfigure them somehow?