I need a few C/C++ components to implement the Plain VM, one of them is a RTOS . I wrote my own RTOS that runs on both Arduino, ESP32, STM32, Windows and Linux years ago. It is a simple linear scheduler. I found it quite handy even on Windows applications as it scale better and…
One concern as I implement the VM is the parsing performance on instructions. The Data Descriptor below illustrate the challenge. It is a dynamic structure with bit fields. For every bit field I end up decoding it causing AND /ROTATE instructions. It is bit packed to save space, but decoding a bit-packed field will cost…
I have a few Raspberry PI Hat’s laying around and I wonder if I should make a ESP32 based replacement for Raspberry PI Zero W. The IO on ESP32 is far more capable than the one on the PI, but we have a few limitations and less pins to play with.This is an early draft…
This litle Servo about 3 x 3cm is far from a wimp as far at current usage goes. A single Servo have no problem dragging a 10A PSU down – actually I think it’s the current regulation that is predictive, meaning it drops out because current raise is to fast – but, anyway – the…
Been a long day with try & fail. I managed to get Auto Reset working on 1.0 by connecting RST to ChipPU amd DTR to GPIO0, but it only worked some times. Walking back to my rev 1.1 I wanted to test manual loading and discovered it did not work either. Inspecting ESP32 I notice…
I finally got new PCB’s for this utility driver and I still can’t get the programmer port to work automatically. All engineering is like that some times – try and fail – two steps forward, one step back. In this case it sadly involves waiting 6+ weeks for a new PCB once I find ut…
I decided to change the Call Instruction to the one below. As we return with an event code we consume the NIX and process the first “On” that will test for event code and continue to next “On” if not. At this point I can consider dropping “On” and replace it with “If” or “Switch”…
All the Plain entries in here have served their design purpose as I consolidate and wrap up Plain Specification. I usually never bother with a specification on software I do at home, but the complexity and technical design of both language and VM have to many details that needs to be right. The new VM…
Josef Prusa recently launched 2 3D Printer upgrades that are worth noticing. One is the MK3 and the second is the new MMU Upgrade for the MK3. The total price of these will be something like 900.- EUR. I have copied pictures of them below: MK3 implement new technologies that are very interesting comparing with…
My first laser printer (a HP) stopper working after years of usage, and I have been in the marked for a color laser for some time. They had a Brother DCP9015CDP on sale, so I went for it. This is a large All-In-One printer with Wifi. It was dead easy to set up and my…