Hi. I've been working on getting a gsm modem functional using the GSM Modem Zephyr driver on an nRF5340. I believe I have the overlay file setup correctly, but am recieving unexpected log output. There is log output for net & ppp configuration before any code in main is called to initialize the modem, as per the sample gsm_modem. The modem is on UART1 and the output is going to the console on UART0, as best as I can tell.
The first 2 log lines show different address for the gsm modem than what device_get_binding("modem_gsm") returns.I'm currently blocked at an error message from gsm_ppp.c in gsm_configure() that sends "AT" to the modem and expects "AT" back. Origin or last log error message: gsm_ppp.c #L975.
Should I be concerned with the different device addresses or not?
- net_ppp.ppp_driver_init: 0x20000214
- modem_gsm.gsmo_init: Generic GSM Modem: 0x20000730
- main() gsm device: 0x2000025c
uart:~$ *** Booting Zephyr OS build v2.6.0-rc1-ncs1 *** [00:00:00.407,562] <dbg> net_ppp.ppp_driver_init: [0x20001d88] dev 0x20000214 [00:00:00.407,653] <dbg> modem_gsm.gsm_init: Generic GSM modem (0x20000730) [00:00:00.407,684] <dbg> modem_gsm.gsm_init: iface->read 0x1594f iface->write 0x15985 [00:00:00.407,714] <dbg> modem_gsm.gsm_rx: starting [00:00:00.407,775] <dbg> modem_gsm.gsm_configure: Starting modem 0x20000730 configuration [00:00:00.407,989] <dbg> net_mgmt.net_mgmt_event_init: (main): Net MGMT initialized: queue of 2 entries, stack size of 768 [00:00:00.407,989] <dbg> net_ppp.ppp_iface_init: [0x20001d88] iface 0x20000544 [00:00:00.408,020] <dbg> net_l2_ppp.net_ppp_init: (main): Initializing PPP L2 0x20001b58 for iface 0x20000544 [00:00:00.412,597] <dbg> net_mgmt.net_mgmt_add_event_callback: (conn_mgr): Adding event callback 0x200032d8 [00:00:00.412,597] <dbg> net_mgmt.net_mgmt_add_event_callback: (conn_mgr): Adding event callback 0x200032ec [00:00:00.412,628] <dbg> conn_mgr.conn_mgr_handler: (conn_mgr): Connection Manager started [00:00:00.412,658] <dbg> net_l2_ppp.tx_handler: (tx_handler_thread): PPP TX started [00:00:00.412,658] <inf> main: Configured: PIN_MUX_CELL_WIFI_ENABLE [00:00:00.412,658] <inf> main: Configured: PIN_MUX_CELL_WIFI_SWITCH [00:00:00.412,689] <inf> main: Select Cell GSM Modem [00:00:00.412,689] <inf> main: Configured: PIN_main_STATUS [00:00:00.412,689] <inf> main: Configured: PIN_main_DTR [00:00:00.412,689] <inf> main: Configured: PIN_main_ON_OFF [00:00:00.412,689] <inf> main: Configured: PIN_main_RESET [00:00:00.412,689] <inf> main: Turning gsm modem on via 1500ms sleep time. [00:00:00.412,719] <inf> main: GSM Modem is already on. Returning. [00:00:00.412,719] <inf> main: Board 'nrf5340dk_nrf5340_cpuapp' APN 'ATT' UART 'UART_1' device 0x200001b4 (modem_gsm) [00:00:00.412,719] <dbg> main.init_main: GSM Device: 0x2000025c [00:00:00.412,750] <dbg> net_mgmt.net_mgmt_add_event_callback: (main): Adding event callback 0x20002550 [00:00:02.408,020] <dbg> modem_gsm.gsm_configure: modem not ready -116 [00:00:02.408,050] <dbg> net_l2_ppp.ppp_startup: (sysworkq): PPP 0x20001b58 startup for interface 0x20000544 [00:00:02.408,050] <dbg> net_l2_ppp.ipcp_init: (sysworkq): proto IPCP (0x8021) fsm 0x20001c70 [00:00:02.408,081] <dbg> net_l2_ppp.lcp_init: (sysworkq): proto LCP (0xc021) fsm 0x20001ba0 [00:00:02.408,111] <dbg> modem_gsm.gsm_configure: Starting modem 0x20000730 configuration [00:00:04.408,355] <dbg> modem_gsm.gsm_configure: modem not ready -116 [00:00:04.408,386] <dbg> modem_gsm.gsm_configure: Starting modem 0x20000730 configuration [00:00:04.408,401] <dbg> modem_gsm.gsm_configure: modem not ready -116 . . .repeating forever...
.
Based on other overlay files on github I believe I have the overlay file correct.
&uart0 {
status = "okay";
};
&uart1 {
status = "okay";
tx-pin = <3>;
rx-pin = <8>;
rts-pin = <2>;
cts-pin = <7>;
current-speed = <115200>;
gsm: gsm-modem {
status = "okay";
compatible = "zephyr,gsm-ppp";
label = "modem_gsm";
};
};
Edit: Modem: NL-SW-LTE-TC4NAG
I'm using Pin 3 for TX. Pin 3 can be used for NFC or GPIO. I had to add a config option to prj.conf: `CONFIG_NFCT_PINS_AS_GPIOS=n`.
