Here, we'll return the value from an array defined in the assembler file to the calling C function. When writing programs like this it's handy to refer to a "cheat sheet" like this one. If everything works as it should your serial monitor should have the following output: There are two files here: returnArrayValue.S and […]
Here I want to post an example of an assembler function that simple sends a value back to the C function that called it. The concept and approach are pretty general, but it is specifically aimed, via the assembler code for running on the RP2350 RISC-V system. Small changes would be needed for a PIC18, […]
Now, let's blink an LED using the Arduino IDE and the Xiao RP2350. I'm going to use a really handy YouTube video by Xeno Kovah: Arch1005: RISC-V Assembly 13 Writing Assembly 02 GCC Inline Assembly. This opens up the possibility of using "extended" assembler to allow for the passing of values between your C and […]
GitHub is a good way to collaborate on shared software projects if you're looking for an off-site, third-party system for storing and sharing the code. The repositories on the GitHub site can be either private or public, but they are available to the company that owns GitHub, Microsoft. I use MCUXpresso on macOS to develop […]
A lot of people have been asking whether Microchip's MPLAB X runs on Apple Silicon machines. The answer is: Yes. I have just tested it out on my Apple M3 Pro MacBook Pro. It works fine so far. I have installed MPLAB X v6.20 and the XC8 compiler. I've hooked up a PIC16 board and […]
My colleague, Eric Prandovszky, has been discussing the M5Stack system with me for a while and acquired a few modules to us to try out. Today I tried out the M5Stack Core 2 AWS module. My objective is to see if we can program it using the legacy Arduino 1.x IDE on macOS with Apple […]
As part of a research project I'm resurrecting some KL25Z boards and ChipKit basic I/O shield boards and seeing if they can be used together. The ChipKit has some pushbuttons and LEDs. The following code, with the help of single-stepping and the debugger can get the LED bank and BTN1 on the ChipKit I/O board […]
In the previous post I showed you how to use VPL and simAVR together to write a basic activity that would test to see if a student could change or assign the value of a register in the simulated microcontroller using the C programming language. While it was the most straight-forward way that I could […]
In Computer Architecture classes or Embedded Systems classes, it can be really useful to allow for students to be graded on assignments that allow them to interactively explore the inner workings of a microprocessor. One way is to have the students create programs in a hardware description language like Verilog or VHDL. Another way is […]
The SIMAVR package is for simulating AVR processors like the ATMEGA328 on the Arduino UNO. I'm looking to try to use it with VPL in courses like our computer architecture class, EECS 2021, as a way of simulating the UNO's processor in exercises involving assembler and C programming. On a Mac, we use HomeBrew. The […]