This addition allows for cheap testing of a STM32H755 (dual core). This borrows the setup file STM32H757xx.py, as there are almost no changes between the chips. CRSF in and out, gps, ICM20948, BMP388, settings saving to on board flash all working.
PWM(3) pin change
Changed PWM(3) pin to one exposed on connector
Walter Dunckel