Both Ethernet, UART, USART, USB, SPI, I2C, I2S and CAN might be used as a serial 2-way, buffered byte stream. This is an important abstraction as it allow for an easy, uniform usage of byte streams regardless of underlying technology. To support this I create the same interface on all technologies and an object “stream”…
Functions are a critical part of any modern language, also in PScript. Functions must be declared before they area used. A PScript will start executing the first global statement it find, but it will parse and tag functions on it’s way – so a general good rule is to put the global PScript code at…
Many of you have seen this before – it’s my 60V/50A 3-Phase Motor Driver “Thunderstick”. It was a messy first assembly with greece coming through PCB holes, but I am all in all very happy with this design and will be using three of these controllers on the lawn mower. These are quite advanced drivers…
A module like ZED-F9P cost 148.- EUR and cover all these with an accuracy of 10 cm. The cost of thus module is currently a limitations, but cost will come down. I am more interested in the fact that it announce 10cm accuracy which open up a lot of usability options. The classic 2.5 meters…
I recently studied a robotic lawn mover and realized that I can easily build one of those myself. To get started I need two wheels with separate motors and the picture above is the driving mechanism for an electric scateboard. The wheels are 200mm in diameter and entire construction is ca 400mm wide. It is…
With PScript being an interpreter running on the embedded device we need to be realistic about how much we can get in. Plain is a complex language in full, so we need to limit and adjust content with Flasgh size of the package in mind. One example is CAN on STM32. CAN is ca 50…
I have decided on a set of datatypes that I want to support. bit Bit is a 1 bit data variable. Used as a separate variable it will minimum be 8 bits, but used inside a record it get bit packed. uint8 8 bit unsigned integer int8 8 bit signed integer uint16 16 bit unsigned…
uint8 myArray[50] The statement above is an array of 50 bytes. The first element is 0 while the last is 49. uint8 myArray[1..50] This is the same array of 50 elements, but now with the first element as 1 and the last as 50. foreach uint8 x through myArray … end The foreach statement…
To adapt PScript to the current platform I add an interface to add “built-in” content and a C++ library with some content prepared. This is to make PScript as scalable as possible as built-in content needs to be platform specific and depending on how much Flash/SRAM that is available. Records Records are bit-packed and can…
Using GPIO as an example I would like to be notified then an input pin change. To do this in C I use an interrupt function so I need a similar event reception in PScript. The most logical is that the framework check for events in between statements, and if one found execute an event…