If you don’t know the type at compile time you can just use the template parameter type and the compiler will deduce the type from the function call itself. For example, see the commented out c’tor below. This is great for typing the size of std::array function parameter. However you could come unstuck if a…
random things I made and things I learnt making them
Author: bitshiftjo1
Using struct module to send/receive floats over TCP socket with Python
Server This sends 10 floats at a time, on a loop. The transmit data type is determined by the’=%sf’ % payload.sizeformat string passed tostruct.pack. import socket from struct import * import numpy as np #number of floats we are sending payload_size = 10 payload = np.linspace(0, 10, payload_size) print(‘Sending {}’.format(payload)) #pack the floats as bytes…
Retaining axis limits using pan and zoom with Matplotlib
from matplotlib import pyplot as plt import numpy as np import matplotlib.animation as animation import sys class AniPlot(): # init the class def __init__(self): # get the figure object self.fig = plt.figure() # setup a single axes self.ax = plt.subplot(1, 1, 1) # register the callbac to kill the app when the window is closed…
Modifying U-Boot Kconfig with configuration fragments and Yocto on the MCIMX6UL-EVKB evaluation board
Your eval board boots, but it hangs during the “starting linux kernel” message. You can’t debug the Linux kernel because it hasn’t loaded yet. So the next option is to debug the preceding U-Boot bootloader. This article explains how to configure a Yocto layer to modify the Uboot Kconfig settings (without hacking about in the tmp/work directory!)
Adding user configuration to device files using STM32CubeIDE’s “Device Configuration Tool”
The STM32CubeIDE can be used to generate device tree source file (.dts) for your embedded linux image. These describe the hardware for the board on which linux will run. This is compiled into a device tree binary file (.dtb) which is included on the image and loaded by u-boot along with the Linux kernel zImage.
In this article we are going to create two STM32CubeIDE projects – a DK-2 project with all the presets and a custom project for the custom board – and compare them side-by-side.
Designing a custom STM32MP1 board for embedded Linux using Yocto and OpenSTLinux
Custom Board Design First lets discuss the hardware. There are vendor boards available: Evaluation boards are expensive due to the large number of external connectors and integrated circuitry (including FPGAs and HDMI decoders!). These are really meant for sales demos. Any development work done on these would be wasted time since your own custom design…
Novation Bass Station Sequencer Part6 – Bringing it all together
Previous Post Block diagram – System Overview The step sequencer will be interface with the Novation BassStation via the ribbon cable on the left, with optional support for 3rd devices via a MIDI interface on the right. This will allow the sequencer to be reused for other MIDI-supported devices. Microcontroller pinout The microcontroller pinout specifics…
Novation Bass Station Sequencer Part5 – User Interface
Previous Post Front panel design So lets talks about how we want the front panel to be laid out. Lets start with the connector interface: 20-Pin Ribbon cable connector for the synth interface switching. Power (in the form of a barrel connector). MIDI in/out (for future compatibility with 3rd party devices). Convention says we put…
Novation Bass Station Sequencer Part4 – PSU
Previous Post Power Supply Requirements Description Total 1 MCU (STM32G0B1) 3.3V 10mA, at max settings 10mA 2 BassStation I/O 5V 8uA; each ch, drawn from bass station connector 8uA 3 RGB LED Driver IC (TLC5955) 5V 2 x 1.5A (500mA per colour group) 3A 4 Keyscan IC (ADP5587) 3.3V 200uA per key pressed 50uA per…
Novation Bass Station Sequencer Part3 – Input
Designing the sequencer Previous Post So whats next? Well we need some way to set the steps on the sequencer. I want 16 steps per bar, each step can be illumintated by the user, with an ability to set the note (and the duration). The sequencer runs through the individual steps at a given tempo,…