RUN/STOP 9000 is a work in progress audio synthesizer for STM32 dev kits.

This device is designed to be hosted on an RPi.

NB STM32 dev kits are not designed for commercial use.

• 7 waveforms, SINE, TRIANGLE, SAWTOOTH, PWM, NOISE, 'SORE', RAMP
• NOISE emulates the VCS2600 tuned noise wave.
• The `BROADWAVE' function generator can be extended as a 32-Bit mini-sequencer of up to 8 nibbles with each nibble being a different waveform.
• Support from up to 8 different midi controllers, 1 per channel. EG midi mix on 1, minilab 3 on 3 etc

This project is expected to be realeased here summer 2026.

12-BIT DAC OUTPUT
PA4 DAC1 ---- 4K7 --+-- 10uF --+-- OUTPUT
                    |    NP    |
                   222        470K
                    |          |
ANALOG GROUND ------+----------+-- GROUND

GENERIC TM1637 MODULE
PB5 CLOCK D4         5V TOLERANT
PB3 DATA  D3         5V TOLERANT

TODO

```c static inline q15_t nco_sorefunc(uint32_t acc) { q15_t y = acc » 16; if (acc & 0x40000000) y = -y; if (acc & 0x80000000) return -y; return (y); } ```