STM32F401 toggle speed experiment

16 April, 2022 - 12:45 — Nick

void setup() {
       pinMode(PC13, OUTPUT);
}

void loop() {
       digitalWrite(PC13, !digitalRead(PC13));
}
Output rate = 421.86kHz

void setup() {
       pinMode(PC13, OUTPUT);
}

void loop() {
       HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
}
Output rate = 1.049MHz

84MHz STM32F401CCU6 WeAct Black Pill V1.2
(GPIO speed register controlling the slew rate at default)

Mouse Wheel Speed in Gnome

7 May, 2013 - 15:59 — Nick

First you need to install imwheel using whatever package manager you use.
Ubuntu users should be able to use the software centre apt://imwheel
Or command line:

sudo apt-get install imwheel

Put imwheel in your Preferences -> Startup Applications list.

Download the code below http://www.nicknorton.net/mousewheel.sh
Save it into your home folder, make it executable. Run it and enjoy.

#!/bin/bash
# Version 0.1 Tuesday, 07 May 2013
# Comments and complaints http://www.nicknorton.net
# GUI for mouse wheel speed using imwheel in Gnome
# imwheel needs to be installed for this script to work
# sudo apt-get install imwheel
# Pretty much hard wired to only use a mouse with
# left, right and wheel in the middle.
# If you have a mouse with complications or special needs,
# use the command xev to find what your wheel does.
#
### see if imwheel config exists, if not create it ###
if [ ! -f ~/.imwheelrc ]
then

cat >~/.imwheelrc<<EOF
".*"
None,      Up,   Button4, 1
None,      Down, Button5, 1
Control_L, Up,   Control_L|Button4
Control_L, Down, Control_L|Button5
Shift_L,   Up,   Shift_L|Button4
Shift_L,   Down, Shift_L|Button5
EOF

fi
##########################################################

CURRENT_VALUE=$(awk -F 'Button4,' '{print $2}' ~/.imwheelrc)

NEW_VALUE=$(zenity --scale --window-icon=info --ok-label=Apply --title="Wheelies" --text "Mouse wheel speed:" --min-value=1 --max-value=100 --value="$CURRENT_VALUE" --step 1)

if [ "$NEW_VALUE" == "" ];
then exit 0
fi

sed -i "s/\($TARGET_KEY *Button4, *\).*/\1$NEW_VALUE/" ~/.imwheelrc # find the string Button4, and write new value.
sed -i "s/\($TARGET_KEY *Button5, *\).*/\1$NEW_VALUE/" ~/.imwheelrc # find the string Button5, and write new value.

cat ~/.imwheelrc
imwheel -kill

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