How do I issue an AT command (to modem) and get response?
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@tom There is definitely different dmesg output when using the two different modems.
For the RC7611...[ 19.303681] usb 1-1.1: New USB device found, idVendor=1199, idProduct=68c0 [ 19.303716] usb 1-1.1: New USB device strings: Mfr=3, Product=2, SerialNumber=4 [ 19.303743] usb 1-1.1: Product: Qualcomm CDMA Technologies MSM [ 19.303766] usb 1-1.1: Manufacturer: Qualcomm, Incorporated [ 19.303788] usb 1-1.1: SerialNumber: 7e7dbded [ 19.343459] option 1-1.1:1.0: GSM modem (1-port) converter detected [ 19.345574] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0 [ 19.347060] option 1-1.1:1.2: GSM modem (1-port) converter detected [ 19.349603] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1 [ 19.351815] option 1-1.1:1.3: GSM modem (1-port) converter detected [ 19.353829] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2 [ 19.362619] mdss_register_panel: mdss mdp resource not initialized yet [ 19.362665] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel [ 19.373309] qmi_wwan 1-1.1:1.8: cdc-wdm0: USB WDM device [ 19.377024] qmi_wwan 1-1.1:1.8 wwan0: register 'qmi_wwan' at usb-xhci-hcd.0.auto-1.1, WWAN/QMI device, ffffffc06c1ebd10 [ 19.383161] mdss_register_panel: mdss mdp resource not initialized yet [ 19.383184] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel [ 22.285452] usb 1-1.1: USB disconnect, device number 3 [ 22.287788] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0 [ 22.287966] option 1-1.1:1.0: device disconnected [ 22.289656] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1 [ 22.289854] option 1-1.1:1.2: device disconnected [ 22.294800] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2 [ 22.295177] option 1-1.1:1.3: device disconnected [ 22.296485] qmi_wwan 1-1.1:1.8 wwan0: unregister 'qmi_wwan' usb-xhci-hcd.0.auto-1.1, WWAN/QMI device [ 22.297369] [RMNET:HI] rmnet_config_notify_cb(): Kernel is trying to unregister wwan0 [ 22.350081] [RMNET:HI] rmnet_config_notify_cb(): Kernel is trying to unregister wwan0 [ 24.045813] msm-dwc3 7600000.hsusb: DWC3 in low power mode [ 30.455740] msm-dwc3 7600000.hsusb: DWC3 exited from low power mode [ 30.711346] usb 1-1.1: new high-speed USB device number 4 using xhci-hcd [ 30.812657] usb 1-1.1: config 1 has an invalid interface number: 8 but max is 3 [ 30.812706] usb 1-1.1: config 1 has no interface number 1then for the EM7565...
[ 3.882936] usb 1-1.2: New USB device found, idVendor=1199, idProduct=9091 [ 3.882948] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 3.882955] usb 1-1.2: Product: Sierra Wireless EM7565 Qualcomm\xffffffc2\xffffffae Snapdragon\xffffffe2\xffffff84\xffffffa2 X16 LTE-A [ 3.882961] usb 1-1.2: Manufacturer: Sierra Wireless, Incorporated [ 3.882969] usb 1-1.2: SerialNumber: UF92358533041506 [ 3.893106] ufshcd 624000.ufshc: ufshcd_ioctl: User buffer is NULL! [ 3.908035] qcserial 1-1.2:1.0: Qualcomm USB modem converter detected [ 3.908701] usb 1-1.2: Qualcomm USB modem converter now attached to ttyUSB0 [ 3.911484] mdss_register_panel: mdss mdp resource not initialized yet [ 3.911493] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel [ 3.933495] ufshcd 624000.ufshc: ufshcd_ioctl: User buffer is NULL! [ 3.938487] qcserial 1-1.2:1.2: Qualcomm USB modem converter detected [ 3.938850] usb 1-1.2: Qualcomm USB modem converter now attached to ttyUSB1 [ 3.941502] mdss_register_panel: mdss mdp resource not initialized yet [ 3.941513] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel [ 3.961700] ufshcd 624000.ufshc: ufshcd_ioctl: User buffer is NULL! [ 3.962458] ufshcd 624000.ufshc: ufshcd_ioctl: User buffer is NULL! [ 3.964776] ufshcd 624000.ufshc: ufshcd_ioctl: User buffer is NULL! [ 3.970480] qcserial 1-1.2:1.3: Qualcomm USB modem converter detected [ 3.970849] usb 1-1.2: Qualcomm USB modem converter now attached to ttyUSB2 [ 3.973775] mdss_register_panel: mdss mdp resource not initialized yet [ 3.973786] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel [ 4.003719] qmi_wwan 1-1.2:1.8: cdc-wdm0: USB WDM device [ 4.004200] qmi_wwan 1-1.2:1.8 wwan0: register 'qmi_wwan' at usb-xhci-hcd.0.auto-1.2, WWAN/QMI device, ffffffc0f080c390 [ 4.006956] mdss_register_panel: mdss mdp resource not initialized yet [ 4.006966] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel [ 4.017858] ufshcd 624000.ufshc: ufshcd_ioctl: User buffer is NULL! [ 4.019045] ufshcd 624000.ufshc: ufshcd_ioctl: User buffer is NULL!Do those errors on the EM7565 make any sense to you?
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@Ed-Sutter I'm not sure whether those errors are related to the Sierra modem or not. It might be worth reaching out to Sierra themselves about the issue? They may be able to provide any missing kernel patches if there are any.
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usually you just need to tell the kernel to associate the USB id with a driver. Has that been done where you have built your own kernel with the new USB device ID?
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@Chad-Sweet I forget the name of the file at the moment, but I did look into this a while back and the VID/PID for the EM7565 was already in your build, so I didn't do anything beyond that.
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ah, shoot. that's an easy one
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@Chad-Sweet LOL, well I do have to go back now and "remember" what I did 'cause I just updated to the latest package and the wwan0 interface isn't coming up at all.
Yikes! I hope I took good notes. -
@Chad-Sweet FYI... to be clear, its only a problem with the EM7565 over USB, your modem card with the RC7611 works fine.
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@Chad-Sweet Yet another update... after rebooting, and re-installing the EM7565, wwan0 did come up this time.
But I still have the problem that I can't communicate with /dev/ttyUSB2. -
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