NRF9160 DK UART fustration!!!

[Celso Prieto]

I'm starting to be fustrate with nrf9160 evaluation as it seems nothing works in our environment.

We have had a lot of issue to run SPI (not running yet) but as we are in a hurry we were thinking to use a STM32 MCU which is dealing properly with our SPI device and sending data to nrf9160 using UART but it seems almost impossible for us to have something properly integrated.

We are following Serial LTE Modem application demostration.

We have connected our STM32 MCU to NRF9160DK following Connecting with an external MCU

On nRF91 DK using P0.11 / P0.10 / P0.12 and P0.13 as per described on those instrucctions.

We also edited conf and overlay files as described above.

Impossible to have a basic UART communication.

a lot of following debug messages 

[00:11:57.410,400] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (4)
00:11:57.408,599] <dbg> slm_uart_handler: rx_recovery: UART RX enabled
[[00:11:57.411,315] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (4)
[00:11:57.411,743] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (8)
[00:11:57.412,170] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (4)
[00:11:57.417,724] <dbg> slm_uart_handler: uart_callback: UART_RX_DISABLED
[00:11:57.418,151] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (4)
00:11:57.411,254] <dbg> slm_uart_handler: rx_recovery: UART RX enabled
[[00:11:57.419,067] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (4)
[00:11:57.419,494] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (8)
[00:11:57.419,921] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (4)
[00:11:57.420,379] <dbg> slm_uart_handler: uart_callback: UART_RX_DISABLED
[00:11:57.420,776] <dbg> slm_uart_handler: uart_callback: UART_RX_STOPPED (4)
00:11:57.419,006] <dbg> slm_uart_handler: rx_recovery: UART RX enabled

is anything missing on instructions?

Also when we set up VDD to 3V there is a message where SPI cannot initialized memory.

As i say fustrating as following instruccions of everyting , nothing works.

We tested same devices on other equipments and working fine.

Even Push button 1 is not working, doing same code on B1 and B2 , B1 never works.

[Celso Prieto]

when VDD selected to 3V following debug message 

SEGGER J-Link V7.94e - Real time terminal output
SEGGER J-Link (unknown) V1.0, SN=960003718
Process: JLink.exe
[00:00:00.253,936] <wrn> spi_nor: Waiting until flash is ready

application not working.

[Øyvind]

Hello, 

sorry to hear about your struggle with our nRF9160DK and the Serial LTE Modem application. 

What version of the nRF Connect SDK are you running? Could you also elaborate more on what exactly you are trying to achieve in your setup? i.e. are you sending sensor data from STM32 MCU via the nRF9160 to a cloud solution? What exactly are you trying to use SPI for?

Thanks. 

Kind regards,
Øyvind

[Celso Prieto]

Hello

nrf Connect SDK is 2.6.0.

I think our main problem is to understand how can we implement external devices into nrf9160DK board, as it looks following the steps on your official guides are not enough to have external devices connected.

As i said , we we follow your guide to connect external MCU there is something missing.

What we want to achieve at this stage is basically send AT commands from STM32 through UART2, what are  the steps on nrf9160DK to achieve that?

we are feeling nrf9160DK is not well documented or too many samples to be a product to use in our deployments.

Regarding SPI, we wanted to implement a basic W5500 ethernet , but was impossible to have SPI working, while we did same on STM32 or ESP32 with succedd.