flipperscope

To compile and install

cd flipperzero-firmware/applications_user
git clone https://github.com/anfractuosity/flipperscope.git
cd ..
./fbt DEBUG=1 VERBOSE=1 fap_scope
./fbt launch_app APPSRC=applications_user/flipperscope

Alternatively the binary can now be installed from https://lab.flipper.net/apps/flipperscope or the Flipper Mobile App.

Provide signal to pin 16/PC0, with a voltage ranging from 0V to 2.5V and ground to pin 18/GND.

Press the 'ok' button (button in the centre of joypad) to pause/unpause the waveform display.

Demo showing three different waveform types from a signal generator.

Also see Derek Jamison's demonstration of this app as well as other interesting projects.

Measurements

Measures frequency of waveform in hertz
Measures voltage: min, max, Vpp

To Do

Customisable input pin
Trigger type mode
FFT
...

Inspiration

For GUI menu system, used code principles from weather station and signal generator apps
STM32 DMA example
VREFBUF information - https://community.st.com/s/question/0D53W00001awIlMSAU/enable-and-use-vrefbuf-for-adc-measures
Relocating vector table - https://community.nxp.com/t5/i-MX-Processors/Relocate-vector-table-to-ITCM/m-p/1302304