UART communication between nrf9160 and nrf52840

RE: UART communication between nrf9160 and nrf52840

ericlestor — Wed, 09 Nov 2022 06:03:51 GMT

Thank you very much both for your support! It works now.

RE: UART communication between nrf9160 and nrf52840

Øyvind — Tue, 08 Nov 2022 14:27:35 GMT

Unfortunately, there is no easy way to check this other than reprogramming the board controller. The board controller firmware can be found in the download tab of the nRF9160DK product page. Please reprogram the onboard nRF52840 with this firwmare and redo your tests.

More information can be found in the Board controller chapter of Developig with nRF9160 DK

If this does not work I will need more information on how to reproduce this issue on my side.

Kind regards,
Øyvind

RE: UART communication between nrf9160 and nrf52840

ericlestor — Tue, 08 Nov 2022 13:55:58 GMT

Where can I check this if it is enabled or disabled?

RE: UART communication between nrf9160 and nrf52840

Øyvind — Tue, 08 Nov 2022 12:55:41 GMT

Hello,

Please make sure that the nRF9160 Board Controller has not enabled external memory control.

Kind regards,
Øyvind

RE: UART communication between nrf9160 and nrf52840

ericlestor — Tue, 08 Nov 2022 12:43:03 GMT

Hi,

I did remove it. Here is the prj.conf code:

#
# Copyright (c) 2020 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
# General config
CONFIG_LOG=y
CONFIG_LOG_DEFAULT_LEVEL=3
CONFIG_STACK_SENTINEL=y
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_RING_BUFFER=y

# Segger RTT
CONFIG_USE_SEGGER_RTT=n
CONFIG_RTT_CONSOLE=n
CONFIG_UART_CONSOLE=y
CONFIG_LOG_BACKEND_RTT=n
CONFIG_LOG_BACKEND_UART=y

# Network
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_NATIVE=n

# Modem library
CONFIG_NRF_MODEM_LIB=y
# Align the max FD entry to NRF_MODEM_MAX_SOCKET_COUNT(8)
CONFIG_POSIX_MAX_FDS=8
# Enable below for modem trace
#CONFIG_NRF_MODEM_LIB_TRACE=y
# Handle modem fault
CONFIG_NRF_MODEM_LIB_ON_FAULT_APPLICATION_SPECIFIC=y

# Use GPIO
CONFIG_GPIO=y
CONFIG_GPIO_NRFX=y

# UART interface
CONFIG_SERIAL=y
CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_TIMER2=y

# Stacks and heaps
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_HEAP_MEM_POOL_SIZE=16384
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096

# Device power management
CONFIG_PM_DEVICE=y

# FOTA
CONFIG_HTTP_PARSER_URL=y
CONFIG_FOTA_DOWNLOAD=y
CONFIG_FOTA_DOWNLOAD_PROGRESS_EVT=y
CONFIG_DFU_TARGET=y
CONFIG_DOWNLOAD_CLIENT=y
CONFIG_DOWNLOAD_CLIENT_STACK_SIZE=4096
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_IMG_MANAGER=y

# FLASH
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y
CONFIG_IMG_ERASE_PROGRESSIVELY=y

# Settings
CONFIG_SETTINGS=y
CONFIG_SETTINGS_FCB=y
CONFIG_FCB=y

# nRF Cloud
#CONFIG_NRF_CLOUD_IPV6=y
CONFIG_NRF_CLOUD_MQTT=y
CONFIG_NRF_CLOUD_FOTA=n
CONFIG_NRF_CLOUD_AGPS=y
CONFIG_NRF_CLOUD_AGPS_FILTERED=n
CONFIG_NRF_CLOUD_PGPS=y
CONFIG_NRF_CLOUD_CELL_POS=y
CONFIG_NRF_CLOUD_LOG_LEVEL_INF=y
CONFIG_NRF_CLOUD_GPS_LOG_LEVEL_INF=y
CONFIG_DATE_TIME=y
CONFIG_MODEM_INFO=y
CONFIG_MODEM_INFO_ADD_DATE_TIME=n
CONFIG_AT_MONITOR=y
CONFIG_MODEM_JWT=y
CONFIG_NRF_CLOUD_CLIENT_ID_SRC_INTERNAL_UUID=y

#
# SLM-specific configurations
#
CONFIG_SLM_CUSTOMIZED=n
CONFIG_SLM_LOG_LEVEL_INF=y
CONFIG_SLM_EXTERNAL_XTAL=n
CONFIG_SLM_START_SLEEP=n

# nRF Cloud based location services
CONFIG_SLM_AGPS=n
CONFIG_SLM_PGPS=n
CONFIG_SLM_CELL_POS=n

# Serial DFU support
CONFIG_SLM_NRF52_DFU=n
CONFIG_SLM_NRF52_DFU_LEGACY=n

RE: UART communication between nrf9160 and nrf52840

JoEi — Tue, 08 Nov 2022 12:37:05 GMT

Hi,

if you don't want to use it you have to remove the "hw-flow-control" from your overlay file.
Could you post your whole prj.conf?

Kind regards,
Johannes

RE: UART communication between nrf9160 and nrf52840

ericlestor — Tue, 08 Nov 2022 11:45:58 GMT

Transmission finishes, but I get no response from nrf9160, I.e. no APP_UART_DATA_READY or APP_UART_DATA events or any response to AT commands. Not using flow control, disabled it from the nrf9160 side as well.

RE: UART communication between nrf9160 and nrf52840

JoEi — Tue, 08 Nov 2022 11:02:46 GMT

Hi,

APP_UART_TX_EMPTY just means that the transmission has finished, so there isn't a problem.
You can use this event to start another transmission if for instance you saved another message inside a fifo.

Are you really using flow control?
According to your nrf9160 overlay file you are using it, but when initialising the uart on the nrf52840 you are disabling it.

Kind regards,
Johannes