I currently plan using INA194 that have a 50x gain. As our max voltage in is 3.3V this means the max voltage over the shunt need to be 3.3/50= 66mV. Given a max current of 2.5A that gives a Shunt resistor R = V/A = 0.066/2.5 = 0,0264 R or 25mOhm. Now – 2.5A over…
Left side of the 3-Phase/Stepper/PWM Hat done. This is the hardest bit, but it went much easier this time because the previous attempts gave some hints and lessons learned. I am far from finished, but it is not hopeless. My main concern is the ground-plane getting to fragmented and unable to support the currents –…
I am returning to this board to make a new attempt because it is a very attractive board to make + I just received another bunch of DR8313 chips and Connectors that I need to use for something. What stalled me on the last attempt was several issues: 12 x current sensors are a bit…
Baudrates like 110, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 115200, 230400, 460800, 921600 are rather standard, but what do you use to set 10Mbps? Testing with a Windows PC I manage to get 2Mbps as shown here, but Windows is not able to open higher frequencies. I am in this case…
I have not tested everything yet, but rev 1.1 of XPortHub need a few changes: correct package on serial flash. wap sequence on dip switch. replace battery with a proper battery holder. Can be mounted on back-side if needed. This also fix the short-cut here. Test Power Connector. I have a 2-pin connector that is…
This was a rare bug on the XPortHub! I have not bothered to test the super-cap/battery for the VBAT much, but suddenly realized as I was doing other changes that I had an error message related to this. And correct – measuring the PCB I have a self infected short-cut. CNC machinery making PCB’s require…
FATFS is a middleware component you can add to create a MicroSD API with full file I/O support. It only takes a few clicks with CubeMX and you have an API with the following and more: f_mount(): Register/Unregister a work area f_open(): Open/Create a file f_close(): Close a file f_read(): Read a file f_write(): Write…
I finally managed to sort out the CubeMX/SW4STM32 error so I can move on a bit. The XPortHub (pictured above) is coming together very well. Sadly I have to upgrade this due to the Flash footprint error, so I will make some other adjustments as well. CubeMX auto-generate all drivers with pin-setting, FreeRTOS, USB driver…
I would like to simplify all Java applications, so I suggest I create my own Java 3 VM. It will only need one instruction: CRASH I had a project for XPortHub in CubeMX that worked well, upgraded CubeMX and shit hit the fan. Obviously the new CubeMX generate or don’t generate some script that SW4STM32…
Soldering 0.5 pitch components is a challenge to get right. My latest problem have been cold soldering. Meaning that pins look ok, but as I test them I have no connection. Not sure if this is lack of temperature, lack of solder tin or what, but I will have to find a more reliable way…