EScope sampling data from an STM32H723 card:
In this animated gif an audio signal from a youtube video (https://www.youtube.com/watch?v=UZyb_wIjKCk) is being fed into the ADC of the STM32H723 running at a sampling rate of 20 kHz.
To connect the audio output from some source device, the following circuit is used. In this case the circuit connects the audio output of a raspberry pi to the STM32H7 device.
EScope can display one trace from one input on the STM32H723 device, optionally using the input as a trigger input. As on physical digital storage oscilloscopes, input signals can be AC coupled. The vertical gain and offset can be adjusted by dragging corresponding user interface elements. As of now the voltage scale is not correct, so consider the scale arbitary.
Open a terminal in your home directory and install the Escope package written by Daniel Wagenaar using the command
git clone https://github.com/wagenadl/escope.git
Once installed create a new subdirectory in your home directory
mkdir ext
Enter the directory and install this repo into the directory
cd ext
git clone https://github.com/baika654/EScope.git
Once installed copy these three files from the repo to the Escope install
copy <home>\ext\Escope\src\escope\escopelib\esstm32hardware.py <home>\Escope\src\escope\escopelib
copy <home>\ext\Escope\src\escope\escopelib\esstm32h7.py <home>\Escope\src\escope\escopelib
copy <home>\ext\Escope\src\escope\escopelib\esstopwatch.py <home>\Escope\src\escope\escopelib
Add the following lines of code to <home>\Escope\src\escope\escope.py
At about line 16 in the import section add
from .escopelib.esstm32hardware import ESStm32Hardware
Add the following to the function makedocks()
def makedocks(self):
self.h_hw = ESHardware(self.cfg)
self.h_hw.cfgChanged.connect(self.hwChanged)
self.docklay.addWidget(self.hw)
self.h_hw.hide()
# ********** New code goes here ***********
self.h_stm32hw = ESStm32Hardware(self.cfg, self)
self.docklay.addWidget(self.h_stm32hw)
self.h_stm32hw.hide()
# *********** End of new code section ********
Add the following lines of code to <home>\Escope\src\escope\escopelib\esconfig.py
Add the following line in the import section
from . import esstm32h7
Add the following to the function findadapters()
def findadapters():
lst=[('dummy',)]
# ********** New code goes here ***********
stmdevs = esstm32h7.deviceList()
for dev in stmdevs:
lst.append(('STM32H7', dev))
# *********** End of new code section ********
To run the software, open a terminal in your home directory and type
cd escope
python escope
The program may not initially run as python libraries that are needed by the software may not be installed. Use pip to fix this.
The software for this board can be downloaded from https://github.com/baika654/STM32H7DAQ.git
The STM32 device can only run at a maximum sampling frequency of 100 kHz. More work on the STM32H7 code is needed to reach higher sampling frequencies.
EScope and ESpark are licensed under the GPL license, version 3 or—at your choice—any later version. See LICENSE for more information.