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Currently there is support for reserved bits sets to zero or one.
#[packed_field(bits="0..=2")]
_zeroes: ReservedZero<packed_bits::Bits::<3>>,
#[packed_field(bits="3..=4")]
_reserved_one: ReservedOne<packed_bits::Bits::<2>>,
However there is no (it seems) way to define a constant value for reserved bits.
I found two approaches to define it.
- use constructor
#[derive(PackedStruct, Debug, Clone, PartialEq)]
#[packed_struct(bit_numbering = "msb0", endian = "msb")]
pub struct Status {
#[packed_field(bits = "0..=3")] // bit numbering is MSB
_start_flag: Integer<u8, packed_bits::Bits<4>>, // MUST be 0b1100
....
pub const STATUS_FLAG: u8 = 0xA0;
impl Status {
pub fn new() -> Status {
Status {
_start_flag: STATUS_FLAG.into(),
}
}
}
- define dummy fields for each bit (which makes constructor bigger)
pub struct Status {
// next four bits represent a constant 0b1100
_start_flag3: ReservedOne<packed_bits::Bits::<1>>,
_start_flag2: ReservedOne<packed_bits::Bits::<1>>,
_start_flag1: ReservedZero<packed_bits::Bits::<1>>,
_start_flag0: ReservedZero<packed_bits::Bits::<1>>,
It would be amazing if I could pass a constant somehow (ReservedBits<0b1100, packet_bits::Bits<4>>?)
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