Function io_send_op_cond 

pub fn io_send_op_cond(
    switch_to_1_8v_request: bool,
    voltage_window: u16,
) -> Cmd<R4>

ACMD5: IO Op Command

• switch_to_1_8v_request - Switch to 1.8V signaling
• voltage_window - 9-bit bitfield that represents the voltage window supported by the host. Use 0x1FF to indicate support for the full range of voltages