The D-Sub 9 to right contains the pinout for CAN. And As I use a flat-cable to connect to the header to Left I also did the mistake of assuming that Pin 2 on the header is pin 2 on the D-Sub 9 so my pinout is completely messed up. Looking at the left header…
CPU load in out case is a definition – if I say that a cycle time of 100yS (0,00001 Sec) is 100% CPU Load then the data above indicate we have 10% CPU Load – if we say 1ms is 100% we are at 1% CPU load. We use in average 10 yS to execute…
The idea is to have 1:1 between connectors and D-SUB9, but for testing I just connected all three on the same cable with a D-SUB9 for Laptop connection. This is a stanadard 10x flat cable. Pin 10 is shield if needed. I have not connected 5V and GND on D-Sub9, but I will in the…
Got more parts today so I finally have connectors, USB and SD-Card mounted – lack Ethernet yet + discovered that the PSRAM has a more narrow footprint than I used. Not sure I am bothered with mounting PSRAM on this version because strapping another nCS will be difficult – one nice thing with narrow footprint…
As you build a modular system you will implement a lot of variables in each module that you might want to change as part of configuration or see as they are sensor values. To do this I create a separate module called a “Dictionary” that is illustrated below. The dictionary itself is a large Index…
I am waiting on parts for the USB, SD-Card, Ethernet and Modules so the next task I can work on is the CAN interface. The actual barebone CAN interface is autogenerated by STM32CubeIDE in C, so all we need to do is to create a proper IO queue, deal with timing and error handling. Most…
I am using W25Q16JV as SPI Flash and for this purpose I need a generic SPI driver that I can use in a W25Q16JV Driver. This is part of my Abstraction Layer in C++ where I add a little extra code to avoid having to deal with HAL/HW Interface on every SPI device I use.…
Below is a high level draft of switching logic that I want to implement on the 3 x CAN board. The “standard” firmware on any CAN Hub is that you forward CAN messages to/from USB or Ethernet, but we can do so much more than that by creating programmable switch logic. I have called this…
9 leds on this board – 7 are up running. I lack parts yet, but will start Ethernet tomorrow. Just happy that I mnaged to fix crystal and are running at 550Mhz for now. Happy Easter folks!
I can’t fix the crap above – working with STM32CubeIDE you get used to SW bugs and slow perfomance as can be expected by most Java applications – that screen is something you see a lot… I got the MCU running with no crystal, added a 25Mhz crystal and it worked. Added some other components…