STM32L011F4 only have 16Kb Flash, and as I generate the code I need from STM32CubeIDE it compiles to 11,37Kb on Debug, leaving only 4,63Kb Free for the application. Looking at the map I see several nasty C functions n the drivers. The GCC compiler is decently good and greedy on bytes, but that don’t help…
This is the block diagram for XPortHub2 with an added Watchdog/D-bus. My objective here is that I want to add some features to the board and decided to do an experiment adding an external Watchdog/D-Bus by using a smaller STM32 in support. SPX3819 can be switched on/off enabling me to power a board on/off. Adding…
3D model of XPortHub2. This contains an 10/100Mbps Ethernet with a standard RJ45 socket that replace TF Card, I2C and SPI on XPortHub1. New style SWD port. Raspberry PI Backbone with SPI and CAN. RTC with Battery holder on back. 8 x user leds. 2 x CAN ports. CAN1 is connected on Raspberry PI Connector…
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…