St have a good series of MCU’s and I have stuck with F405 for a while. But, I just discovered G474RE, G484RE, G484CEm G491CE etc. This series is very similar to F405, but contains a lot of extras for a lower price. Also some of the MCU’s are LQFP48, but it is still a M4…
We will always have some kind of RTOS behind PScript regardless where we execute, so what I need a few system functions to interface to the RTOS in an uniform way. I my own linear scheduler that scale better than and that is perfect for extending thread shifters. The advantage is that I get the…
Part 6 introduces an easy way of communicating where one module raise an event and another receive it. But, for this to work I need some infrastructure that easyIPC provides for me. easyIPC uses a device address where device 0 is NMT (Network Master) on the local network. At this point I don’t care if…
I need a way to communicate with the rest of the world, and the method I like is “Events” where you send and receive packets or byte streams. Let’s annotate an example where I read temperature from an ADC once a second and display it on the PC. In this case I use PScript in…
I am currently at ca 13Kb Flash usage and 1Kb SRAM usage. SRAM usage can be adjusted, but Flash usage is fixed and will increase with definition of more build-in stuff. This is on a CISC, so I am not 100% sure how that convert to a RISC MCU, but it looks decently good. I…
As with any programming language we need to define a list of operators and how they behave. After years of C/C++ programming I simply copy the list from that language as a start. This first list show mathematical operators. Operator Description + Addition: a+b – Subtraction: a-b / Divide. a/b * Multiply: a*b +a Positive…
PScript would only be able to perform math unless we integrate it to the target platform. In the drawing above I illustrate (1) the build in function “print” and (2) a variable “a”. Both are declared as a C/C++ struct in a table that point to a function with a specific format that accept a…
I must admit that PScript is a nice break from the larger BSA task. Sadly BSA is written in C# and PScript in C++ because PScript is perfect for extending BSA. But, I can actually use C++ from C#, so lets see. I have created a stack that I use while I interpret and I…
I surpriced myself with how easy it was to implement the PScript Interpreter and would like to share the basic technique that I am using. The language is still under development, but the idea is to have a minimalistic Interpreter that can be used embedded so I need a very small footprint on the core…
I draftet a specification for a PScript interpreter some time ago and have implemented a minimalistic version. Basically I am down on very small footprints using only 1020 bytes SRAM to execute a decent size script. I actually think I will try implementing this on an Arduino Uno just for fun, it is that small.…