Using modem_cellular and gnss-nmea-generic simultaneously

[jp_]

Hi,

I am developing on the nRF5340 and using an external modem and an external GNSS module.I am using SDK version 3.4.0.

To operate the modem, I use `modem_cellular`.

To operate the GNSS, I use `CONFIG_GNSS` with `gnss-nmea-generic`.

Individually, both work perfectly. However, if I try to run them simultaneously, neither works. During testing, I noticed that if `CONFIG_PM_DEVICE=y` is enabled, the GNSS stops working.

Is there a way to get both working at the same time?

Best Regards

CONFIG_GNSS=y

CONFIG_GNSS_SATELLITES=y

CONFIG_LOG=y

CONFIG_LOG_BACKEND_SHOW_COLOR=y

CONFIG_LOG_FUNC_NAME_PREFIX_DBG=y

CONFIG_LOG_FUNC_NAME_PREFIX_INF=y

CONFIG_LOG_FUNC_NAME_PREFIX_WRN=y

CONFIG_LOG_FUNC_NAME_PREFIX_ERR=y

CONFIG_LOG_MODE_IMMEDIATE=y

CONFIG_LOG_BUFFER_SIZE=8192

CONFIG_GNSS_DUMP_TO_LOG=y

CONFIG_GNSS_DUMP_TO_LOG_BUF_SIZE=1024

#CONFIG_GNSS_LOG_LEVEL_DBG=y

#CONFIG_MODEM_MODULES_LOG_LEVEL_DBG=y

# Nécessaire pour gnss-nmea-generic / modem_backend_uart

CONFIG_MODEM_MODULES=y

CONFIG_UART_INTERRUPT_DRIVEN=y

CONFIG_POSIX_API=y

# Networking

CONFIG_NETWORKING=y

CONFIG_NET_NATIVE=y

CONFIG_NET_L2_PPP=y

CONFIG_NET_IPV4=y

CONFIG_NET_UDP=y

CONFIG_NET_SOCKETS=y

CONFIG_NET_CONTEXT_RCVTIMEO=y

# DNS

CONFIG_DNS_RESOLVER=y

CONFIG_NET_L2_PPP_OPTION_DNS_USE=y

# Network management

CONFIG_NET_MGMT=y

CONFIG_NET_MGMT_EVENT=y

CONFIG_NET_CONNECTION_MANAGER=y

# Modem driver

CONFIG_MODEM=y

CONFIG_PM_DEVICE=y

CONFIG_MODEM_CELLULAR=y

# Dynamic APN configuration (uncomment if not needed)

#CONFIG_MODEM_CELLULAR_APN="" # Remove default APN

#CONFIG_SAMPLE_CELLULAR_MODEM_AUTO_APN=y

#CONFIG_SAMPLE_CELLULAR_APN_0="shared.m2m.ch"

#CONFIG_SAMPLE_CELLULAR_IMSI_LIST_0="22801"

#CONFIG_SAMPLE_CELLULAR_APN_1="em"

#CONFIG_SAMPLE_CELLULAR_IMSI_LIST_1="29505 90143 29509"

# Statistics

CONFIG_MODEM_STATS=y

CONFIG_SHELL=y

# Testing

CONFIG_MODEM_AT_SHELL=y

CONFIG_PM_DEVICE_SHELL=y

CONFIG_SHELL_WILDCARD=n

# Logging

CONFIG_LOG=y

CONFIG_MODEM_MODULES_LOG_LEVEL_DBG=y

&uart1 {

        compatible = "nordic,nrf-uarte";

        current-speed = <115200>;

        hw-flow-control;

        status = "okay";

        pinctrl-0 = <&uart1_default>;

        pinctrl-1 = <&uart1_sleep>;

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

        modem: modem {

                compatible = "telit,me310g1";

                status = "okay";

                mdm-power-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;

                //mdm-power-gpios = <&gpio0 9 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;

                mdm-dtr-gpios = <&gpio0 29 GPIO_ACTIVE_HIGH>;

                //mdm-reset-gpios = <&gpio0 24 GPIO_ACTIVE_LOW>;

                //mdm-pwrmon-gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;

        };

};

&uart3 {

        compatible = "nordic,nrf-uarte";

        current-speed = <115200>;

        //hw-flow-control;

        status = "okay";

        pinctrl-0 = <&uart3_default>;

        pinctrl-1 = <&uart3_sleep>;

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

        gnss: gnss-nmea-generic {

                compatible = "gnss-nmea-generic";

        };

};

[Hakon]

Hello,

Individually, both work perfectly. However, if I try to run them simultaneously, neither works. During testing, I noticed that if `CONFIG_PM_DEVICE=y` is enabled, the GNSS stops working.

do you have any more information about the issue than "neither works"? Any log output that shows what is going on?

Also if the errors happen specifically with the external modem or GNSS module, there is not so much we can help with as we have not developed this hardware. I assume you are using the Zephyr cellular modem driver, in that case I would also advice you to reach out to the Zephyr community as this is not a Nordic maintained driver.