[arm-allstar] USB GPS Cannot open serial port /dev/ttyS0

[David Panscik]

 Hi David,
There is a chance the actual port is /dev/ttyUSB0
You can find out for sure what the port is named by using this commanddmesg | grep tty

The command will return any USB connection that has "tty" in its name.
Hope this helps.
73David - KN6GUW
    On Monday, June 8, 2020, 11:05:21 AM PDT, David McGough via ARM-allstar <arm-allstar at hamvoip.org> wrote:  
 
 
For USB serial devices, use the device files: /dev/ttyUSB*

So, for the 1st USB serial device, the file would be: /dev/ttyUSB0


73, David KB4FXC


On Mon, 8 Jun 2020, "PD1ASH . via ARM-allstar" wrote:

> Hi all,
> 
> Question regarding USB GPS.
> 
> 
> I would like to experiment with an external USB GPS receiver.  (u-blox 7 -
> GPS/GNSS Receiver)
> 
> My AST log gives me this error: WARNING[436] app_gps.c: Cannot open serial
> port /dev/ttyS0
> 
> 
> Does anyone have any thoughts.  I believe this has to do something with
> access rights, but i'm not sure.  I'm not a Arch Linux script writer hi.
> 
> 
> 
> GPS.conf and Modules.conf have been changed to show the fixed (default)
> position on APRS.fi.
> 
> 
> 
> 
> 
> GPS.conf file
> 
> 
> interval = 600 ; Beacon interval in seconds
> icon = -  ; A CAR (default)  Icon do be displayed for station on APRS
> display (see below)
> comport = /dev/ttyS0  ; Serial port for GPS receiver (specify this only if
> using GPS receiver)
> baudrate = 4800  ; Baud rate for GPS receiver (specify this only if using
> GPS receiver)
> ;debug = y ; set this for debug output
> lat=53.152645 ; Fixed (default) latitude in decimal degrees
> lon=6.320687 ; Fixed (default) longitude in decimal degrees
> 
> 
> 
> 
> 
> In Modules.conf i have changed noload to load.
> 
> 
> 
> load => app_gps.so ;    GPS interface module
> 
> 
> The USB GPS green led is blinking when it is getting a fixed signal. But
> APRS.FI is not getting the USB GPS coordinates.
> 
> Website APRS.FI is showing the fixed default coordinates that i have
> entered in GPS.conf.    Even when i change the default fixed coordinates
> in gps.conf  to a place like in Africa, the USB GPS is not working
> properly.
> 
> 
> Anyone have had this conflict before.
> The Pi is seeing the USB adapter on Bus 001 Device 005: ID 1546:01a7 U-Blox
> AG.
> 
> 
> 
> 
> 
> 
> 
> dmesg | grep tty
> 
> 
> [    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0
> bcm2708_fb.                    fbwidth=640 bcm2708_fb.fbheight=480
> bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec000                    00
> vc_mem.mem_size=0x40000000  root=/dev/mmcblk0p2 rw rootwait
> console=ttyS0,115                    200 console=tty1 selinux=0
> plymouth.enable=0 smsc95xx.turbo_mode=N dwc_otg.lpm_e
>  nable=0 kgdboc=ttyS0,115200 elevator=noop audit=0
> [    0.001004] console [tty1] enabled
> [    4.473861] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81,
> base_baud                      = 0) is a PL011 rev2
> [    7.046591] cdc_acm 1-1.2:1.0: ttyACM0: USB ACM device
> [root at AllStar boot]#
> 
> 
> lsusb
> 
> Bus 001 Device 004: ID 0d8c:0012 C-Media Electronics, Inc.
> Bus 001 Device 005: ID 1546:01a7 U-Blox AG
> Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514
> Fast Ethernet Adapter
> Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> 
> 
> 
> Rolf,
> 
> PD1ASH
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> 
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> 

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