I recently purchased a LoRaSerial kit. They seemed to be working as expected, but now one of the devices is not responding to a “+++” on the serial port. The red power LED is on and the blue LED is also on and get bright when serial traffic passes through from the USB connection. Holding the train button to factory reset doesn’t seem to help.
Any recommendations?
Are you holding reset > 10 secs?
Run through the guide https://docs.sparkfun.com/SparkFun_LoRaSerial/training/ to see if maybe they’re stuck in diff modes, and as a last-chance try updating the firmware and circling back to the beginning…any change?
Yes, I was holding the reset > 10 seconds. It looks like it was deprogrammed somehow. It looks related to it being used on a Linux computer - I have not tracked down what is causing this yet. One thing that I am noting that is strange is that it is connecting/disconnecting fairly regularly. Here is some dmesg output showing this behavior:
[928141.308850] usb 2-1.2: new full-speed USB device number 26 using ehci-pci
[928141.397088] usb 2-1.2: New USB device found, idVendor=1b4f, idProduct=002a, bcdDevice=42.01
[928141.397095] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[928141.397099] usb 2-1.2: Product: SAMD21 LoRaSerial
[928141.397103] usb 2-1.2: Manufacturer: SparkFun
[928141.397107] usb 2-1.2: SerialNumber: 318EF0995055344A342E3120FF15281E
[928141.397894] cdc_acm 2-1.2:1.0: ttyACM0: USB ACM device
[928141.398469] usb-storage 2-1.2:1.2: USB Mass Storage device detected
[928141.399236] scsi host9: usb-storage 2-1.2:1.2
[928141.400729] hid-generic 0003:1B4F:002A.0007: hiddev0,hidraw4: USB HID v1.00 Device [SparkFun SAMD21 LoRaSerial] on usb-0000:00:1d.0-1.2/input3
[928142.401969] scsi 9:0:0:0: Direct-Access SAMD21 L oRaSerial 1.00 PQ: 0 ANSI: 2
[928142.402967] sd 9:0:0:0: Attached scsi generic sg2 type 0
[928142.403502] sd 9:0:0:0: [sdb] 16000 512-byte logical blocks: (8.19 MB/7.81 MiB)
[928142.404157] sd 9:0:0:0: [sdb] Write Protect is off
[928142.404163] sd 9:0:0:0: [sdb] Mode Sense: 0f 00 00 00
[928142.404778] sd 9:0:0:0: [sdb] No Caching mode page found
[928142.404785] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[928142.413546] sdb:
[928142.416648] sd 9:0:0:0: [sdb] Attached SCSI removable disk
[937592.710085] usb 2-1.2: USB disconnect, device number 26
[937592.766593] FAT-fs (sdb): unable to read boot sector to mark fs as dirty
[937713.207365] usb 2-1.2: new full-speed USB device number 27 using ehci-pci
[937713.300822] usb 2-1.2: New USB device found, idVendor=1b4f, idProduct=002a, bcdDevice= 1.00
[937713.300828] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[937713.300833] usb 2-1.2: Product: LoRaSerial
[937713.300837] usb 2-1.2: Manufacturer: SparkFun
[937713.300841] usb 2-1.2: SerialNumber: 6355233450303057502E3120FF0F170C
[937713.303776] cdc_acm 2-1.2:1.0: ttyACM0: USB ACM device
[937740.679007] usb 2-1.2: USB disconnect, device number 27
[937741.879805] usb 2-1.2: new full-speed USB device number 28 using ehci-pci
[937741.973011] usb 2-1.2: New USB device found, idVendor=1b4f, idProduct=002a, bcdDevice= 1.00
[937741.973018] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[937741.973022] usb 2-1.2: Product: LoRaSerial
[937741.973026] usb 2-1.2: Manufacturer: SparkFun
[937741.973030] usb 2-1.2: SerialNumber: 6355233450303057502E3120FF0F170C
[937741.975256] cdc_acm 2-1.2:1.0: ttyACM0: USB ACM device
[941616.287231] usb 2-1.2: USB disconnect, device number 28
[941616.289785] cdc_acm 2-1.2:1.0: failed to set dtr/rts
[941617.488216] usb 2-1.2: new full-speed USB device number 29 using ehci-pci
[941617.581217] usb 2-1.2: New USB device found, idVendor=1b4f, idProduct=002a, bcdDevice= 1.00
[941617.581224] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[941617.581228] usb 2-1.2: Product: LoRaSerial
[941617.581232] usb 2-1.2: Manufacturer: SparkFun
[941617.581236] usb 2-1.2: SerialNumber: 6355233450303057502E3120FF0F170C
[941617.582130] cdc_acm 2-1.2:1.0: ttyACM1: USB ACM device
[946259.388252] usb 2-1.2: USB disconnect, device number 29
[946304.877506] usb 2-1.2: new full-speed USB device number 30 using ehci-pci
[946304.970506] usb 2-1.2: New USB device found, idVendor=1b4f, idProduct=002a, bcdDevice= 1.00
[946304.970513] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[946304.970518] usb 2-1.2: Product: LoRaSerial
[946304.970522] usb 2-1.2: Manufacturer: SparkFun
[946304.970525] usb 2-1.2: SerialNumber: 6355233450303057502E3120FF0F170C
[946304.972507] cdc_acm 2-1.2:1.0: ttyACM0: USB ACM device
I’m not Linux expert, but it looks like it might be trying to mount the SD card as a drive, disconnecting the USB controller? Can you try a PC or Mac and report if any similar errors appear?