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.…
I use XPortHub1 a lot, but have not assembled XPortHub2 with Ethernet yet. What I would like is a XPortHub with radio and I am thinking of 5Km LoRa. With that I could use this as the master on my robots. I also need a SPI Flash or something to store config. I can as…
I decided to start making some changes to the DeviceBus experiment. Basically I squeezed the function up in the right corner. Next I will replace RS232 with 2 x RS485 and add a LoRa or maybe Wifi and LoRa. I have little usage for Wired Ethernet on mobile devices, but I do lack radio options.
I have a version of XPortHub that works fine, so I have not been in any hurry to make this 2. unit with Ethernet, but I will finally order the PCB’s. XPortHub is very simple as it is only a switch between USB, CAN, RS485, RS232 and Ethernet. But, that exact functionality is what I…