Arduino for STM32

neo_nmik wrote: Mon Apr 12, 2021 6:27 pm When I poll them, I’m getting 0-1023 (10bit) which is fine for my use, but the upper range (roughly the last 1/4) are all responding 1023.

Are those pots linear or logarithmic ??

Some STM32 MCUs have ADC Vref pins. F103C8(B) do not have those and Vdd is used as ADC reference voltage.
There is internal reference voltage but it's not used as ADC reference. It can be used to calculate (measure) Vdd using equation ag123 provided n post above:

e.g. if vrefint = 1.2v, and you ...

You need pull-up/down resistors on every button with shift registers.

There is an example on STM32duino wiki:
https://github.com/stm32duino/wiki/wiki ... er-library
https://github.com/stm32duino/STM32Exam ... rement.ino

I don't have any problems with this code (on F103, F401 and F411) on windows.
May there is some issue with linux connecting to STM.
Try adding after Serial.begin();

This way, it will wait until usb connection is established .

You can use only one pin with same number (eg. Px15) for interrupts.
And you have:
1. PA3, PB3, PC3
2. PA0, PB0
3. PB8, PC8

It might be this board but there are few manufacturers that make them and there might be some differences.
LED_D1 and LED_D2 are just defined in board file as PF9 and PF10, it might be situation that when they wrote files for this board, they had different version, or just switched those 2 LEDs.

...
Thank you GonzoG! I did think that it might be an issue with speed... But I could've sworn I had it working before I built my little Bluepill-Uno strip board (I was also having loads of issues with bad breadboard cables :roll: )

I had same problem with Uno/Nano using port manipulation ...

Multiplexers need some time after changing I/O address and STMs are much faster then Arduino UNO.
Try with 1ms delay before reading data.

Also, your code is highly inefficient. You can read all 3 multiplexers at once:

void getButtons(void){
keyTable = 0;
for (uint8_t i = 0; i < 8; i ...

You need to set clock source to LSE before rtc.begin().