ADC conversion doesn't start automatically. Problem in os/hal/platforms/STM32/adc_lld.c file. For start you must write ADC_CR2_ADON bit in ADC1->CR2 ones more.
STM32 manual says:
"Conversion starts when ADON bit is set for a second time by software after ADC power-up time"
I have create and attach the patch. But may be I misunderstood something (I'm newbie)