Struct Hc164Cols 

pub struct Hc164Cols<'peripherals> {
    cp: Output<'peripherals>,
    ds: Output<'peripherals>,
    mr: Output<'peripherals>,
    shifter_delay_cycles: u32,
}

Column selector driven by an HC164 shift register.

Fields

cp: Output<'peripherals>

Clock input (CP) for shifting data into the register.

ds: Output<'peripherals>

Serial data input (DS) for the shift register.

mr: Output<'peripherals>

Master reset (MR) input for clearing the register.

shifter_delay_cycles: u32

CPU cycles between pin transitions.

Implementations

impl<'peripherals> Hc164Cols<'peripherals>

pub const fn new( ds: Output<'peripherals>, cp: Output<'peripherals>, mr: Output<'peripherals>, shifter_delay_cycles: u32, ) -> Self

Create a new column selector for the HC164.

fn pulse_cp(&mut self)

Pulse the clock pin for one shift step.

pub fn select(&mut self, col: usize)

Select the given column.

For column 0: clears the register via MR then clocks in a high bit, placing the walking-one at position 0.

For all other columns: clocks in a low bit, advancing the walking-one to the next position. Must be called in strictly ascending order starting from 0 each scan.