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On Monday, April 11, 2016 at 7:50:51 PM UTC+5:30, Bryan Wilcutt wrote:
>
> I've been running tests on a BBB using a Novatel USB760 cellular modem.
> The test I am running is rather simple-- just pinging the modem for it's
> RSSI settings so that I can modify some BB led's to show reception levels
> [4 'bars'].
>
> After some time the modem freezes and stops communicating. Breaking the
> script and restarting doesn't help-- all communication to the USB stick is
> dead and a reboot is required. I'm doubtful it is the USB stick itself
> since there's been a lot of internet chatter of issues with the USB drivers
> on Linux [but I could be wrong].
>
> My boot command line:
>
> cmdline=console=ttyO0,115200n8 root=/dev/mmcblk0p1 quiet loglevel=3
> usbcore.autosuspend=-1
>
> I am using:
>
> 4.1.15-ti-rt-r48
>
> I added "autosuspend" as a suggestion from another site [and have yet to
> test it].
>
> The last test I ran [without autosuspend] got me to 15,577 seconds (4
> hours) and an iteration count of 70,741. At that point, a lock up
> occurred. lsusb still showed the USB stick was present.
>
> Anyone have any suggestions?
>
> Here's my script:
>
>
> #!/bin/bash
> leddir="/sys/class/gpio"
> cmdport="/dev/ttyUSB0"
>
> # Specify which GPIOs belong to which LEDs.
> led_1_gpio=46
> led_2_gpio=27
> led_3_gpio=65
> led_4_gpio=22
>
> # Locale of GPIO pins in fsys
>
> led_1_bar="$leddir/gpio$led_1_gpio"
> led_2_bar="$leddir/gpio$led_2_gpio"
> led_3_bar="$leddir/gpio$led_3_gpio"
> led_4_bar="$leddir/gpio$led_4_gpio"
>
> function traperr {
> while read -t 0 var < $cmdport; do continue; done
> echo "err"
> }
> trap traperr ERR
>
> function setup_gpios {
> # If GPIOs are not already exported, export them here.
> # Set their directions to output.
> if [ ! -e $led_1_bar ]; then
> echo $led_1_gpio > $leddir/export
> echo out > $led_1_bar/direction
> fi
> if [ ! -e $led_2_bar ]; then
> echo $led_2_gpio > $leddir/export
> echo out > $led_2_bar/direction
> fi
> if [ ! -e $led_3_bar ]; then
> echo $led_3_gpio > $leddir/export
> echo out > $led_3_bar/direction
> fi
> if [ ! -e $led_4_bar ]; then
> echo $led_4_gpio > $leddir/export
> echo out > $led_4_bar/direction
> fi
> }
>
> function flush_modem {
> echo "Flushing buffers..."
> input="$cmdport"
> echo -e -n "\r"
> while read -t 0 var < $cmdport; do continue; done
> }
>
> function get_attention {
> input="$cmdport"
> echo "Detecting modem..."
>
> # Get modem attention
>
> echo -e -n "\n\n"
> tries=1
>
> until [[ "$line" == "OK" && "$tries" -lt 10 ]]
> do
> echo -e -n "Try #$tries\r"
> echo -e -n "\nAT\n" > $cmdport
> read -r -t 2 line
> tries=$((tries+1))
> done < "$input"
>
> echo -e "\n"
> if [ "$tries" -eq 10 ]; then
> echo "Could not establish communication to modem, giving up."
> exit 1
> fi
> }
>
> function query_modem {
> input="$cmdport"
>
> # Communicate to the USB Wireless adaptor modem.
> # Query for RSSI - Receive Signal Strength Indicator
>
> echo -e -n "\nAT\$NWRSSI\n" > $cmdport
>
> # Command USB for RSSI info
>
> while read -r -t 2 line; do
> if [[ -z $line ]]; then
> continue;
> elif [[ "$line" == "OK" ]]; then
> break;
> else
> rssi=${line#*=}
> echo "$counter>$rssi"
> counter=$((counter+1))
>
> # Change LEDS - Only channel 1 is used on Onyxx
> # 110+ : No leds (bad quality)
> # 94 - 109 : 1 led (marginal)
> # 85 - 93 : 2 leds (okay)
> # 75 - 84 : 3 leds (good)
> # 0 - 74 : 4 leds (excellent)
>
> rssi=$(echo $rssi | tr -d
> "[:alpha:][:blank:][:space:][:punct:]")
>
> if [[ $rssi -ge 110 ]]; then
> echo 0 > $led_1_bar/value
> echo 0 > $led_2_bar/value
> echo 0 > $led_3_bar/value
> echo 0 > $led_4_bar/value
> elif [[ $rssi -ge 94 ]]; then
> echo 0 > $led_1_bar/value
> echo 0 > $led_2_bar/value
> echo 0 > $led_3_bar/value
> echo 1 > $led_4_bar/value
> elif [[ $rssi -ge 85 ]]; then
> echo 0 > $led_1_bar/value
> echo 0 > $led_2_bar/value
> echo 1 > $led_3_bar/value
> echo 1 > $led_4_bar/value
> elif [[ $rssi -ge 75 ]]; then
> echo 0 > $led_1_bar/value
> echo 1 > $led_2_bar/value
> echo 1 > $led_3_bar/value
> echo 1 > $led_4_bar/value
> elif [[ $rssi -gt 0 ]]; then
> echo 1 > $led_1_bar/value
> echo 1 > $led_2_bar/value
> echo 1 > $led_3_bar/value
> echo 1 > $led_4_bar/value
> fi;
> fi;
> done < "$input"
> }
>
> # The program main()
>
> echo "USB760 RSSI Bar Application"
> setup_gpios
> flush_modem
> get_attention
>
> counter=1
> while true; do
> sleep 0.1 # Allow USB to catch it's breath
> query_modem
> done
>
>
--
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