Synchronized two sequencers, one with Arduino Nano, the other with STM32 Bluepill

Revised some software on both sequencers, now the can run in sync.
The 1984 sequencer gets its clock from a clock source. This sequencer has several outputs:
Digital:
step out (a pulse for each step)
note out (a pulse for each played note)
last (a pulse after the last note)
first (a puls at the start of the sequence)
Analog:
a voltage corresponding with the position of one of the 8 potentiometers
a voltage where the slope is controlled with a switch for each potentiometer and set with the glide potentiometer
Midi:
it has midi out.
Read about it here: electro-music....
The iDRUM sequencer (which is under construction as far as the software concerns) has a trigger- and a reset input.
first 4 outputs (metal colored connectors and green led's) are digital, the last 4 ( gold colored connectors and orange led's) are analog in nature, but for the moment I use them as a trigger pulse (0 to 5 volt)
This too has midi out, but that is not yet implemented in the software.