Constant ADCSRA 

pub const ADCSRA: *mut u8 = _; // {0x7a as *mut u8}

The ADC Control and Status register.

Bitfields:

Name	Mask (binary)
ADPS	111
ADATE	100000
ADIE	1000
ADEN	10000000
ADIF	10000
ADSC	1000000