Merge branch 'master' of https://git.scientificdatasystems.co.uk/robin/useful_linux_scripts

README_CANABLE_V_2_0.txt

@@ -0,0 +1,17 @@
+# the CANable V2.0 does not seem to obej the sjw argument.
+# hence it will miss can bus messages esp 0x0F1FD000 etc.
+# 10DEC2024
+
+sudo ip link set dev can0 down
+sudo ip link set dev can0 up type can bitrate 100000 sjw 4
+sudo ip link set dev can0 up
+
+
+#
+# SJW cannot be changed currently using slcan (which is a serial terminal such as /dev/ttyACM0 linked to the linux kernel)
+# see
+# https://github.com/linux-can/can-utils/issues/30
+# https://github.com/torvalds/linux/commit/80bcf5ec9927
+#
+sudo ip --details link show can0
+

README_USB2CANFD_V1.txt

@@ -0,0 +1,12 @@
+
+
+
+ Commands to get the USB2CANFD V1 working.
+==========================================
+
+$ sudo slcand -o  -s3 -t hw -S 3000000 /dev/ttyACM0
+$ sudo ip link set up slcan0
+
+
+RPC 28NOV2025
+============================================================

bash.bashrc

@@ -140,8 +140,8 @@ export EDITOR vi
  RED="\[\033[0;31m\]"
  YELLOW="\[\033[0;33m\]"
  GREEN="\[\033[0;32m\]"
- 
-PS1="$GREEN\$(date +%Y-%m-%d_%H:%M) \w$RED \$(formattedGitBranch)$GREEN \n\$ "
+hn=`hostname` 
+PS1="$GREEN\$(date +%Y-%m-%d_%H:%M) $YELLOW $hn $GREEN \w $RED \$(formattedGitBranch)$GREEN \n\$ "
 
 export PATH="$PATH:"/opt/microchip/xc8/v1.34/bin""
 

can_logging/crontab.list

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+# Edit this file to introduce tasks to be run by cron.
+# 
+# Each task to run has to be defined through a single line
+# indicating with different fields when the task will be run
+# and what command to run for the task
+# 
+# To define the time you can provide concrete values for
+# minute (m), hour (h), day of month (dom), month (mon),
+# and day of week (dow) or use '*' in these fields (for 'any').
+# 
+# Notice that tasks will be started based on the cron's system
+# daemon's notion of time and timezones.
+# 
+# Output of the crontab jobs (including errors) is sent through
+# email to the user the crontab file belongs to (unless redirected).
+# 
+# For example, you can run a backup of all your user accounts
+# at 5 a.m every week with:
+# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
+# 
+# For more information see the manual pages of crontab(5) and cron(8)
+# 
+# m h  dom mon dow   command
+25 8 * * * /home/robin/reset_can.sh >> /home/robin/can_logs/cronlog.log 2>&1
+#34 10 * * * /home/robin/reset_can.sh >> /home/robin/can_logs/cronlog.log 2>&1

can_logging/reset_can.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# crontab starts bash minimally, so
+export PATH=/usr/local/bin:/usr/bin:/bin
+
+# debugging
+set -eux
+
+sudo ip link set can0 down || { echo "Failed to bring down CAN interface"; exit 1; }
+
+# NON FD or classical only set up
+# sudo ip link set can0 type can bitrate 100000 sjw 128
+sudo ip link set can0 type can bitrate 100000 sjw 128 dbitrate 400000 fd on
+sudo ip link set can0 up
+
+mkdir -p ~/can_logs
+cd ~/can_logs/
+
+d=`date`
+
+echo "-----------------------------------------------------------"  >> can_reset_log.txt
+/usr/sbin/ifconfig can0 >> can_reset_log.txt
+echo "CAN NOW RESET" $d >> can_reset_log.txt
+sudo ip link show can0 >> can_reset_log.txt
+echo "-----------------------------------------------------------"  >> can_reset_log.txt
+
+# Compress any old log files
+#
+find . -type f -name "*.log" -exec  zip {}.zip {}  \;
+# delete uncompressed log files
+find . -type f -name "*.log" -exec  rm -f {}  \;
+
+/usr/bin/candump -l -t A can0 &
+
+
+# Find and delete .log.zip files older than one month
+#
+find . -type f -name "*.log.zip" -mtime +30 -exec rm -f {} \;
+

git_hub_reset_codes.txt

@@ -0,0 +1,16 @@
+b2ef2-46e05
+1bd6d-f3a35
+57c22-85e82
+31fde-6551c
+78bb1-c8f88
+633a1-0c05b
+1e3c0-e3e77
+e7aad-62ae5
+60d1a-9ee24
+b8e33-f7b1d
+2580a-5fb93
+47db7-000df
+05667-25d14
+08460-3cc2a
+e6aba-cc300
+7dde9-81492

ppt2png.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/bash
+################################################################################
+# Generate temporary file safely
+temp_file=$(mktemp)
+ppt "$1" > "$temp_file"
+
+# Count lines directly
+line_count=$(wc -l < "$temp_file")
+
+# Calculate image height (e.g., 20 pixels per line, with a minimum height)
+line_height=20
+image_height=$((line_count * line_height))
+[ "$image_height" -lt 70 ] && image_height=70  # Ensure a minimum height of 70 pixels
+
+# Generate image with dynamic height and fixed-width font
+convert \
+    -size 165x${image_height} \
+    xc:lightblue \
+    -font Courier \
+    -pointsize 12 \
+    -fill blue \
+    -gravity center \
+    -draw "text 0,0 '$(cat "$temp_file")'" \
+    image.png
+
+# Clean up temporary file
+gwenview image.png
+rm $temp_file
+################################################################################

reset_can.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+sudo ip link set can0 down
+# NON FD or classical only set up
+# sudo ip link set can0 type can bitrate 100000 sjw 128
+sudo ip link set can0 type can bitrate 100000 sjw 128 dbitrate 400000 fd on
+sudo ip link set can0 up
+
+mkdir -p ~/can_logs
+cd ~/can_logs/
+
+d=`date`
+
+echo "-----------------------------------------------------------"  >> can_reset_log.txt
+ifconfig can0 >> can_reset_log.txt
+echo "CAN NOW RESET" $d >> can_reset_log.txt
+sudo ip link show can0 >> can_reset_log.txt
+echo "-----------------------------------------------------------"  >> can_reset_log.txt
+
+# Compress any old log files
+#
+find . -type f -name "*.log" -exec  zip {}.zip {}  \;
+# delete uncompressed log files
+find . -type f -name "*.log" -exec  rm -f {}  \;
+
+/usr/bin/candump -l -t A can0 &
+
+
+# Find and delete .log.zip files older than one month
+#
+find . -type f -name "*.log.zip" -mtime +30 -exec rm -f {} \;
+

set_up_can_usb.md

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+
+
+# Example binding slcan to a USB tty serial port
+sudo slcand -o  -s3 -t hw -S 3000000 /dev/ttyACM3
+sudo ip link set dev can0 up type can bitrate 100000
+
+# Example seting up can0 for an SDS CAN HAT for Raspberry pi
+
+sudo ip link set can0 down
+sudo ip link set can0 type can bitrate 100000 sjw 128
+sudo ip link set can0 up
+
+
+
+# to upgrade usb devices  in chromium
+
+Creating a udev rule to grant write permissions to a USB device and automate updating a dongle involves the following steps:
+1. Identify the USB Device
+
+Plug in the USB device or dongle and identify its attributes using lsusb or udevadm.
+Using lsusb:
+
+Run:
+
+lsusb
+
+Find your device in the list. It will look something like this:
+
+Bus 001 Device 004: ID 1234:5678 Vendor_Name Product_Name
+
+    Vendor ID: 1234
+    Product ID: 5678
+
+Using udevadm:
+
+Run:
+
+udevadm info --query=all --name=/dev/bus/usb/001/004
+
+(Replace 001 and 004 with the values from lsusb.)
+
+This command provides detailed information about the device, such as the idVendor and idProduct.
+2. Create a udev Rule
+
+Create a new file for your custom udev rules in /etc/udev/rules.d/.
+
+For example:
+
+sudo nano /etc/udev/rules.d/99-usb-dongle.rules
+
+Add the following rule:
+
+SUBSYSTEM=="usb", ATTR{idVendor}=="1234", ATTR{idProduct}=="5678", MODE="0666"
+
+    Replace 1234 and 5678 with your device's Vendor and Product IDs.
+    MODE="0666" grants read and write permissions to all users. For more restricted access, specify a group and set group ownership (e.g., GROUP="usbusers" and MODE="0660").
+
+3. Reload udev Rules
+
+After saving the rule, reload udev rules and trigger them:
+
+sudo udevadm control --reload-rules
+sudo udevadm trigger
+
+4. Test Permissions
+
+Unplug and replug your device, then check the permissions:
+
+ls -l /dev/bus/usb/001/004
+
+(Replace 001 and 004 with the actual bus and device numbers.)
+
+It should now show the updated permissions.
+5. Automate Dongle Updates
+
+If you have a script or tool to update the dongle, ensure it runs as the user with proper permissions. For example, create an update script:
+
+#!/bin/bash
+echo "Updating dongle..."
+# Replace with the actual command to update your dongle
+your-update-command --device=/dev/bus/usb/001/004
+
+Make it executable:
+
+chmod +x update_dongle.sh
+
+Run the script after ensuring permissions are correct.
+6. Optional: Match by Serial Number or Other Attributes
+
+If multiple devices share the same Vendor/Product IDs, you can refine the rule by matching additional attributes like serial, idProduct, or idVendor.
+
+Example:
+
+SUBSYSTEM=="usb", ATTR{idVendor}=="1234", ATTR{idProduct}=="5678", ATTR{serial}=="ABCDEFG12345", MODE="0666"
+
+You can find these attributes using:
+
+udevadm info --attribute-walk --name=/dev/bus/usb/001/004
+
+
+

time_stamp.py

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+
+
+# Time stamp CAN messages from the serial stream.
+
+import sys
+from datetime import datetime
+import io
+
+def add_timestamp_to_lines():
+    # Ensure stdin is read with a fallback encoding
+    with io.TextIOWrapper(sys.stdin.buffer, encoding='ISO8859-1', errors='replace') as stdin:
+        for line in stdin:
+            if 'CANMSG'  in line or 'CMQ' in line:
+                timestamp = datetime.now().strftime("[%Y-%m-%d %H:%M:%S.%f] ")
+                sys.stdout.write(timestamp + line)
+            #else:
+            #sys.stdout.write(line)
+
+if __name__ == "__main__":
+    add_timestamp_to_lines()