My bad, I'd been testing my header includes against a branch with some draft unification of the adc code. ADC is one of the remaining major peripherals that isn't unified neatly.
------------------------------------------------------------------------------ README ------------------------------------------------------------------------------ This is the smallest-possible example program using libopencm3. It's intended for the ST STM32F3DISCOVERY eval board. It should read from the ADC1_IN1 (PA0) pin its voltage and print it in the LEDs.