I own an Helios ventilation unit, which as very poor firmware. It is buggy, it has useless features, and missing important ones. More, the model I bought will never has a KNX gateway (unlike all other models)... And Helios support is inefficient, at least the french one.
So, I plan to re-write the firmware. But I don't have skills to develop in C (especially with STM32, which is much more complicated than AVR), and I would love to switch to micropython.
The electronic currently uses a LQFP100 STM32F103VBT6 chip. I had a look at the pinout, and it looks like it is really close to the LQFP100 STM32F405RG one! The only differences I found are :
Code: Select all
Pin F103 F405 19 VSSA VDD 20 VREF- VSSA 49 VSS_1 VCAP_1 73 NC VCAP_2
- reroute pin 19 to other VDD signals (if needed)
- keep pin 20 connected, as VREF- should be routed to VSS on previous board (need to check)
- reroute pin 49 and insert a 2,2µF capacitor (to ground)
- insert a capacitor on pin 73, as for pin 49
What do you think? Am I missing import points?
Then, micropython firmware part. I guess I will have to compile a new firmware, in order to support additionnal pin (original pyboard only uses a LQFP64 chip). Is it something easy to do, by changing/adding a few #define in the code? Or does it need to add some code to support additionnal timers/ADC and so?
Last: will it be possible to enable all alternate features to match the ones needed on the vent unit board? I dscribed them here:
https://www.logre.eu/wiki/Firmware_VMC_ ... 9sum.C3.A9
Thanks for your help.
PS : do you know a dev board using a LQFP100 STM32F405RG chip?