Read/Write to a serial terminal using ‘cat’ command

I have come out of hiding to bring you a quick Linux tip. You don’t need any sort of terminal emulation program in order to read and write to a serial device, just ‘cat’.

cat > /dev/ttyUSB0 | cat /dev/ttyUSB0

Obviously the device name will change depending on your use.

That’s it,
-Sam Ellicott
Soli Deo Gloria

On November 14, 2020 By nebkIn SoftwareLeave a comment

C++ Reverb – DSP Final Project

Overview

This past year (Fall 2018) I took a DSP (digital signal processing) class at Cedarville University. At the end of the class, as a final project we had to implement something “cool” using the techniques we learned in the rest of class on a Raspberry Pi. This was supposed to be done using the Raspberry Pi package for Simulink Coder.

For my project, I decided to implement a digital reverb unit; as I thought it would be interesting. I also thought it would be fun to add reverb to my music library. The reverb unit was first implemented in Matlab and Simulink for testing on a desktop, then the filters were ported to C++ so that they could be directly implemented on the Pi without using Simulink coder.

A sample input and output (along with all the code needed for the C++ implementation are available on github). The files Invention_no1.mp3 and Invention_no1_reverb.mp3 are the input and output files respectively.

This post does not go into the math behind digital signal processing, mostly because I did not feel like writing about it. I might eventually, but I probably won’t.

STM32Cube Library – Part 3 Compiling

Okay, I’m finally going to finish this tutorial! This part will cover writing a Makefile to handle compilation and flashing code to the microcontroller.

This is the third part in a multi-part series.

• Part 1: Part 1 Toolchain
• Part 2: Part 2 Hello World

STM32Cube Library – Part 2 Hello World

This is part 2 in a multi-part series. Read part 1 here: The STM32Cube library – part 1 Toolchain

We left off by generating a project in the STM32CubeMX application. Today we will modify the automatically generated code to do our bidding; namely blink several LEDs. This will also provide a tour of usage of the STM32Cube HAL library.

I will be using a stm32f4Discovery board for this tutorial, but it should work on most any other stm32 development board, just be sure to use the correct pins.