Accessing cellular modem via nrf52840dk

RE: Accessing cellular modem via nrf52840dk

Øyvind — Fri, 26 Apr 2024 05:58:16 GMT

Hello,

I'm afraid I can't provide any help on the BG9x, as this is not our device. I suggest reading through the documentation and reaching out to the Zephyr community on Discord. Perhaps the nRF9160 would be a good match?

Kind regards,
Øyvind

RE: Accessing cellular modem via nrf52840dk

vicky_76 — Thu, 25 Apr 2024 18:00:58 GMT

Hey, thanks !

i just got confused between bg9x and cellular_modem driver

now i have changed my project towards the bg9x driver files,

im able to build the project with my module inside uart node, and all the setup commands in the driver got executed fine,

now, how can i able to access the driver api functions, like sending a tcp??

i see all the functions are in the "socket_op_vtable" struct, and that is being configured as modem socket.

is there any guide to look out for to get to know about accessing these sockets??

Kindly guide me through this.

RE: Accessing cellular modem via nrf52840dk

Øyvind — Wed, 24 Apr 2024 13:50:17 GMT

Hello,

Looking at the Cellular modem sample, it configures the dts differently from yours. Did you follow the same steps as it does?

/dts-v1/;

/ {
        aliases {
                modem = &modem;
        };
};

&usart2 {
        pinctrl-0 = <&usart2_tx_pa2 &usart2_rx_pa3 &usart2_rts_pa1 &usart2_cts_pa0>;
        pinctrl-names = "default";
        current-speed = <115200>;
        hw-flow-control;
        status = "okay";

        modem: modem {
                compatible = "quectel,bg9x";
                mdm-power-gpios = <&gpioe 2 GPIO_ACTIVE_HIGH>;
                mdm-reset-gpios = <&gpioe 3 GPIO_ACTIVE_HIGH>;
                status = "okay";
        };
};

Also, the GSM Modem sample (zephyr/samples/net/gsm_modem/) configures the BG95 in the following way:

/* BG95 */
&usart2 {
	pinctrl-0 = <&usart2_tx_pa2 &usart2_rx_pa3 &usart2_rts_pa1 &usart2_cts_pa0>;
	pinctrl-names = "default";
	current-speed = <115200>;
	hw-flow-control;

	dmas = <&gpdma1 0 27 STM32_DMA_PERIPH_TX
		&gpdma1 1 26 STM32_DMA_PERIPH_RX>;
	dma-names = "tx", "rx";

	status = "okay";

	modem: modem {
		compatible = "zephyr,gsm-ppp";
		status = "okay";
	};
};

Did you add the dts to nrf52840dk_nrf52840.overlay?

Kind regards,
Øyvind