One important part of easyIPC is it’s “repository”, a real-time database that hold all information needed. The repository on devices are very simple and is only a map of objects made available through the interface. Raspberry PI on the other hand will need a repository of all devices as well as a log of data…
Our High Level protocol include a 1 byte message code. The reality is that we can also add PID’s as messages with an object containing several parameters. In fact we talked about reserving ranges of PID’s for special needs. With a 2 byte integer we have 65536 possibilities so if we reserve 0 – 0x7FFF…
One of the challenges dealing with a parameterized system is error handling if only some of the parameters are successfully sent. This is a classic issue for systems using Modbus and CAN that we have solved in easyIPC. We earlier described techniques using CAN-X/SPI to transfer larger messages using “envelopes”. As an envelope contain it’s…
We briefly discussed Objects in an earlier post related to Begin- and End – Envelope on CAN-X. To just transfer binary data values creates a lot of fuzz with so many devices involved, so we create a generic tagged system known from ASN.1 and very similar to users of Modbus and CANopen etc. This means…
I have a very strong preference for designing a project and then leave the ideas to mature a bit before I start all the hard work on implementation. The reason is simply because we tend to change design as we get deeper into the subject or get new ideas. I do design in haste then…
easyIPC will be using SmartSPI and CAN-X for transport. I will discuss other transport protocols later. A transport protocol in this context is responsible for transportation of messages in a network from A to B and will cover layer 1 to 5 in the OSI layer. I will introduce several transport protocols later. We need…
SDL (Simple DirectMedia Layer) is a 3D graphics engine that uses OpenGL or DirectX depending on platform. To use it is straight forward. You will do a few rectangles on screen with little work. I am also working with GDI+ on Windows, so I was stunned as to how slow SDL is to start in comparison.…
Using FSMC (Flexible Static Memory Controller) is straight forward as you set up the FSMC I/O and just access the memory directly. What happens is that FSMC Address and Data pins suddenly start clocking on the pins. But, how do I sample ? I was first looking for some kind of “magical” burst technique in…
<I will upload the pic a bit later … > The M4 Olimex board have two buttons and I accidentally noticed that one of the buttons was loosening. Easy to fix with super-glue to add mechanical support, but would have been even easier to solve if routed a bit more wisely on the PCB. Dealing…
This one is from Olimex and is based on STM32F407 LQFP144. It has Ethernet, TF Card and 4 x 20 headers + Arduino Uno compatible headers. As for the Arduino headers pay notice to the capacitors on the bottom half that will be in the way of most Arduino Shields. Also I am a bit…