NRF9160 SIP uart communication with STM32 MCU

[ALEJANDRO_CEIT]

Hi, 

I'm trying to control nrf9160 SIP from stm32 MCU via AT Commands. Should I program on the nrf9160 the AT_CLIENT sample for this purpose or is not neccesary?

I'm trying to do that but I'm not been able and i can't find a tuotorial or guide about how to do it... 

Thanks in advance, 

Best Regards! 

[Hakon]

Hello,

you can try using the SLM sample instead.

[ALEJANDRO_CEIT]

thanks a lot for your response!

I'm trying to use this sample too but i'm not been able to communicate my STM32 MCU with the nrf9160 SIP via uart. 

I modified the "nrf9160dk_nrf9160_ns.overlay" and the "nrf9160dk_nrf9160_ns.conf" to fit with my custom board requirements (uart connected to different pins)

/*

 * Copyright (c) 2021 Nordic Semiconductor ASA

 *

 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

 */

/ {

    chosen {

        ncs,slm-uart = &uart2;

    };

};

&uart0 {

    status = "disabled";

};

&uart2 {

    compatible = "nordic,nrf-uarte";

    current-speed = <115200>;

    status = "okay";

    hw-flow-control;

    pinctrl-0 = <&uart2_default_alt>;

    pinctrl-1 = <&uart2_sleep_alt>;

    pinctrl-names = "default", "sleep";

};

&i2c2 {

    status = "disabled";

};

&pinctrl {

    uart2_default_alt: uart2_default_alt {

        group1 {

            psels = <NRF_PSEL(UART_RX, 0, 5)>;

            bias-pull-up;

        };

        group2 {

            psels = <NRF_PSEL(UART_TX, 0, 6)>,

                <NRF_PSEL(UART_RTS, 0, 24)>,

                <NRF_PSEL(UART_CTS, 0, 25)>;

        };

    };

    uart2_sleep_alt: uart2_sleep_alt {

        group1 {

            psels = <NRF_PSEL(UART_TX, 0, 5)>,

                <NRF_PSEL(UART_RX, 0, 6)>,

                <NRF_PSEL(UART_RTS, 0, 24)>,

                <NRF_PSEL(UART_CTS, 0, 25)>;

            low-power-enable;

        };

    };

};

I don't know if I should change anything more or what i'm doing wrong.. I'm a bit loss at this point.

Best regards

[Hakon]

Do you get any activity on the uart pins at all? Have you checked this with logic trace? What kconfigs have you set in the application?

[ALEJANDRO_CEIT]

no, not activity on the uarts...

this is my kconfig:

source "Kconfig.zephyr"

menu "Nordic Serial LTE Modem"

config SLM_CUSTOMER_VERSION

    string "Customer version string"

    help

       This version is reported together with baseline versions by AT command "#XSLMVER".

config SLM_AT_MAX_PARAM

    int "Maximum number of parameters in AT command"

    default 42

#

# external XTAL for UART

#

config SLM_EXTERNAL_XTAL

    bool "Use external XTAL for UARTE"

    default y

#

# AT command terminator

#

choice

    prompt "Termination mode"

    default SLM_CR_LF_TERMINATION

    help

        Sets the command terminator used by the serial terminal.

        Available options are:

        -  CR termination

        -  LF termination

        -  CR+LF termination

    config SLM_CR_TERMINATION

        bool "CR termination"

    config SLM_LF_TERMINATION

        bool "LF termination"

    config SLM_CR_LF_TERMINATION

        bool "CR+LF termination"

endchoice

#

# UART buffers (when CMUX is not in use)

#

config SLM_UART_RX_BUF_COUNT

    int "Receive buffers for UART"

    range 2 4

    default 3

    help

      Amount of buffers for receiving (RX) UART traffic. If the buffers are full, UART RX will be disabled until the buffers are processed.

config SLM_UART_RX_BUF_SIZE

    int "Receive buffer size for UART"

    range 128 4096

    default 256

    help

      Amount of received (RX), unprocessed, UART traffic that can be held by single buffer.

config SLM_UART_TX_BUF_SIZE

    int "Send buffer size for UART"

    range 128 4096

    default 256

    help

      Amount of UART traffic waiting to be sent (TX), that can be held. If the buffers are full, will send synchronously.

#

# GPIO functionality

#

config SLM_START_SLEEP

    bool "Enter sleep on startup"

    help

      If enabled, the SiP is put into deep sleep when powered on.

      It can then be started using SLM_POWER_PIN.

config SLM_POWER_PIN

    int "Power pin"

    default -1

    help

      Interface GPIO pin used to put the SiP into deep sleep and wake up from it or exit idle.

      The pin is configured with a pull up and must be pulled down shortly to perform one power off or wake up operation.

config SLM_INDICATE_PIN

    int "Indicate pin"

    default -1

    help

      Interface GPIO pin used to indicate that data is available when SLM is idle (after #XSLEEP=2 AT command).

config SLM_INDICATE_TIME

    int "Indication period"

    default 100

    help

      GPIO active indication time in milliseconds. This setting specify the period length for the pin to be active

#

# LTE network automatic attach

#

config SLM_AUTO_CONNECT

    bool "Automatically connect to the LTE network on start-up or after a reset"

    help

      Enables automatic connection to the LTE network using the PDN configuration defined in 'slm_auto_connect.h'.

#

# TCP/TLS proxy

#

config SLM_TCP_POLL_TIME

    int "Poll time-out in seconds for TCP connection"

    default 10

config SLM_UDP_POLL_TIME

    int "Poll time-out in seconds for UDP connection"

    default 10

#

# Data mode

#

config SLM_DATAMODE_TERMINATOR

    string "Pattern string to terminate data mode"

    default "+++"

    help

      Use a pattern to terminate data mode

config SLM_DATAMODE_URC

    bool "Send URC in data mode"

    help

      Report result of data mode sending

config SLM_DATAMODE_BUF_SIZE

    int "Buffer size for data mode"

    range 1024 8192

    default 4096

    help

      Size of the buffer for data received in data mode.

#

# Configurable services

#

config SLM_SMS

    bool "SMS support in SLM"

    default y

    select SMS

    help

      Support SMS send/receive in plain text

config SLM_GNSS

    bool "GNSS support in SLM"

    default y

config SLM_NRF_CLOUD

    bool "nRF Cloud support in SLM"

    default y

config SLM_FULL_FOTA

    bool "Full modem FOTA support in SLM"

    default n

    depends on !BOARD_THINGY91_NRF9160_NS

config SLM_PPP

    bool "PPP support in SLM"

    help

      When enabled, SLM automatically brings up/down the PPP link

      when the LTE link (default PDN) is connected/disconnected,

      regardless of what is done with AT#XPPP.

config SLM_CMUX

    bool "CMUX support in SLM"

if SLM_CMUX && SLM_PPP

config SLM_CMUX_AUTOMATIC_FALLBACK_ON_PPP_STOPPAGE

    bool "AT channel automatic fallback to DLCI 1 when PPP stops."

    help

      This is mainly intended for compatibility with Zephyr's cellular modem driver.

      If enabled, when PPP stops (which happens automatically when the LTE link goes down)

      CMUX will make the AT channel be on DLCI 1. This only has an effect if it had been

      configured to be elsewhere, e.g. with AT#XCMUX=2.

endif

module = SLM

module-str = serial modem

source "${ZEPHYR_BASE}/subsys/logging/Kconfig.template.log_config"

rsource "src/ftp_c/Kconfig"

rsource "src/mqtt_c/Kconfig"

rsource "src/http_c/Kconfig"

rsource "src/twi/Kconfig"

rsource "src/gpio/Kconfig"

rsource "src/lwm2m_carrier/Kconfig"

rsource "src/gnss/Kconfig"

rsource "src/nativetls/Kconfig"

endmenu

thanks a lot!

[Hakon]

You can show what the compiled zephyr.dts and .config file looks like. Then we can know for sure what is enabled and not, and know if the error is in the hardware or software.