J4 at right is the SWD connector. This can be reduced to 3 pins (SWCLK, SWDIO and GND), but it is wise to include Boot0, nRESET and 3.3V. I have painted SWCLK and SWDIO lanes in light red – those are the important ones that needs to be kept as short as possible. The only…
This pic is from the new XPortHub2 with Ethernet via W5500. The routing is close to being a single layer. The total number of passive components makes this occupy 1/3 of the board. The only challenge here is that HR911105A is a bit to tall for the next board in the stack – this…
I am not sure where I wanna use this W5500 circuit, but the nice thing is that KiKad makes this a module I can re-use. This actually is the reference schematics.
Fiber modules have been around for some years. The picture below show a 14.- USD 8 x Ethernet/2 x Fiber Mux/Switch that can be found on AliExpress etc. I have also seen smaller modules and 16 x Ethernet modules in the same price range – also boxed versions. The interesting thing about these is that…
Working on HMI in C#/.NET is fun, but it is a large task to get dark themes right. Below is a list of components that I want to complete: clEditCtrl Simple text edit control. clHScrollBar Horizontal Scroll Bar. clObjectEditor Advanced grid alike editor to edit an “object” with a tree of items. clPopUpMenu Classic pop-up…
A PDO differ from a SDO in the sence that the COB ID is the message ID. In a single system you have 8 x 127 messages that can be PDO and only needs to be know by consumer and producer. A simple PDO Map can map directly to memory variables, but a more proper…
SDO is the simplest part of CANopen that can be compared to Modbus. A SDO message is addressed to a node and consist of Index, Sub-index and 1-4 byte variable. A common implementation is to have indexes in an array with pointers to the actual variable and use bsearch to find index/sub-index. How you implement…
I am considering using CANopenNode to create a full SIIS2 stack, but before I jump into someone elses work I like to think through how and why I want CANopen build. Below is a simple UML diagram. This diagram lack Bootloader and Object Dictionary, but I simply created classes for each bulk of work that…
The industry around me is a heavy user of CANopen (SIIS2) which is the “Subsea” version of a CAN protocol. CANopen is similar to Modbus, but it offer more functionality. It is also a more complicated protocol stack that tend to cost from 5-15K USD depending on content. I have written CANopen protocols in the…
Many modern applications use custom theme/styles, but this is actually far more difficult to implement than you would expect on Windows. Windows have a lot of standard GUI components where you can control most, but not all colors and styles. So, if you want dark theme you either need to buy a library or start…