/// ยง 32.8.7.3 /// Packet Size. /// /// Offset: 0x04 & 0x14 /// Reset: 0xxxxxxxxx /// Property: NA #[derive(Clone, Copy, Debug)] #[repr(C, packed)] pub(crate) struct PckSize(u32); pub(crate) struct R { bits: u32, } pub(crate) struct W { bits: u32, } impl PckSize { pub fn read(&self) -> R { R { bits: self.0 } } pub fn write(&mut self, f: F) where F: FnOnce(&mut W) -> &mut W, { let mut w = W { bits: self.0 }; f(&mut w); self.0 = w.bits; } } impl From for PckSize { fn from(v: u32) -> Self { Self(v) } } impl R { /// Value in raw bits. pub fn bits(&self) -> u32 { self.bits } pub fn auto_zlp(&self) -> AutoZLPR { let bits = { const POS: u8 = 31; const MASK: u32 = 1; ((self.bits >> POS) & MASK) == 1 }; AutoZLPR(bits) } pub fn size(&self) -> SizeR { let bits = { const POS: u8 = 28; const MASK: u32 = 0x7; ((self.bits >> POS) & MASK) as u8 }; SizeR::from(bits) } pub fn multi_packet_size(&self) -> MultiPacketSizeR { let bits = { const POS: u8 = 14; const MASK: u32 = 0x3fff; ((self.bits >> POS) & MASK) as u16 }; MultiPacketSizeR(bits) } // Documentation is wrong on this field. Actually 14 bits from // offset 0. pub fn byte_count(&self) -> ByteCountR { let bits = { const POS: u8 = 0; const MASK: u32 = 0x3fff; ((self.bits >> POS) & MASK) as u16 }; ByteCountR(bits) } } /// Automatic Zero Length Packet /// /// This bit defines the automatic Zero Length Packet mode of the /// pipe. /// /// When enabled, the USB module will manage the ZLP handshake by /// hardware. This bit is for OUT pipes only. When disabled the /// handshake should be managed by firmware. pub(crate) struct AutoZLPR(bool); impl AutoZLPR { pub fn bit(&self) -> bool { self.0 } pub fn bit_is_set(&self) -> bool { self.bit() } pub fn bit_is_clear(&self) -> bool { !self.bit() } } /// Pipe size /// /// These bits contains the size of the pipe. /// /// These bits are cleared upon sending a USB reset. #[derive(Clone, Copy, Debug, PartialEq)] pub(crate) enum SizeR { Bytes8, Bytes16, Bytes32, Bytes64, Bytes128, Bytes256, Bytes512, Bytes1024, } impl SizeR { pub fn bits(&self) -> u8 { match *self { Self::Bytes8 => 0x0, Self::Bytes16 => 0x1, Self::Bytes32 => 0x2, Self::Bytes64 => 0x3, Self::Bytes128 => 0x4, Self::Bytes256 => 0x5, Self::Bytes512 => 0x6, Self::Bytes1024 => 0x7, } } fn is_bytes8(&self) -> bool { *self == Self::Bytes8 } fn is_bytes16(&self) -> bool { *self == Self::Bytes16 } fn is_bytes32(&self) -> bool { *self == Self::Bytes32 } fn is_bytes64(&self) -> bool { *self == Self::Bytes64 } fn is_bytes128(&self) -> bool { *self == Self::Bytes128 } fn is_bytes256(&self) -> bool { *self == Self::Bytes256 } fn is_bytes512(&self) -> bool { *self == Self::Bytes512 } fn is_bytes1024(&self) -> bool { *self == Self::Bytes1024 } } impl From for SizeR { fn from(v: u8) -> Self { match v { 0x0 => Self::Bytes8, 0x1 => Self::Bytes16, 0x2 => Self::Bytes32, 0x3 => Self::Bytes64, 0x4 => Self::Bytes128, 0x5 => Self::Bytes256, 0x6 => Self::Bytes512, 0x7 => Self::Bytes1024, _ => panic!("pcksize between 0 and 7 only"), } } } /// Multi Packet IN or OUT size /// /// These bits define the 14-bit value that is used for multi-packet /// transfers. /// /// For IN pipes, MULTI_PACKET_SIZE holds the total number of bytes /// sent. MULTI_PACKET_SIZE should be written to zero when setting up /// a new transfer. /// /// For OUT pipes, MULTI_PACKET_SIZE holds the total data size for the /// complete transfer. This value must be a multiple of the maximum /// packet size. pub(crate) struct MultiPacketSizeR(u16); impl MultiPacketSizeR { pub fn bits(&self) -> u16 { self.0 } } /// Byte Count /// /// These bits define the 14-bit value that contains number of bytes /// sent in the last OUT or SETUP transaction for an OUT pipe, or of /// the number of bytes to be received in the next IN transaction for /// an input pipe. pub(crate) struct ByteCountR(u16); impl ByteCountR { pub fn bits(&self) -> u16 { self.0 } } impl W { /// Write raw bits. pub unsafe fn bits(&mut self, v: u32) -> &mut Self { self.bits = v; self } pub fn auto_zlp(&mut self) -> AutoZLPW { AutoZLPW { w: self } } pub fn size(&mut self) -> _SizeW { _SizeW { w: self } } pub fn multi_packet_size(&mut self) -> MultiPacketSizeW { MultiPacketSizeW { w: self } } pub fn byte_count(&mut self) -> ByteCountW { ByteCountW { w: self } } } pub(crate) struct AutoZLPW<'a> { w: &'a mut W, } impl<'a> AutoZLPW<'a> { pub fn bit(self, v: bool) -> &'a mut W { const POS: u8 = 31; const MASK: bool = true; self.w.bits &= !((MASK as u32) << POS); self.w.bits |= ((v & MASK) as u32) << POS; self.w } pub fn set_bit(self) -> &'a mut W { self.bit(true) } pub fn clear_bit(self) -> &'a mut W { self.bit(false) } } #[derive(Copy, Clone, Debug, PartialEq)] pub(crate) enum SizeW { Bytes8, Bytes16, Bytes32, Bytes64, Bytes128, Bytes256, Bytes512, Bytes1024, } impl SizeW { pub fn bits(&self) -> u8 { match *self { Self::Bytes8 => 0, Self::Bytes16 => 1, Self::Bytes32 => 2, Self::Bytes64 => 3, Self::Bytes128 => 4, Self::Bytes256 => 5, Self::Bytes512 => 6, Self::Bytes1024 => 7, } } } /// Proxy for `SizeW` pub(crate) struct _SizeW<'a> { w: &'a mut W, } impl<'a> _SizeW<'a> { pub unsafe fn bits(self, v: u8) -> &'a mut W { const POS: u8 = 28; const MASK: u8 = 0x7; self.w.bits &= !((MASK as u32) << POS); self.w.bits |= ((v & MASK) as u32) << POS; self.w } pub fn variant(self, v: SizeW) -> &'a mut W { unsafe { self.bits(v.bits()) } } pub fn bytes8(self) -> &'a mut W { self.variant(SizeW::Bytes8) } pub fn bytes16(self) -> &'a mut W { self.variant(SizeW::Bytes16) } pub fn bytes32(self) -> &'a mut W { self.variant(SizeW::Bytes32) } pub fn bytes64(self) -> &'a mut W { self.variant(SizeW::Bytes64) } pub fn bytes128(self) -> &'a mut W { self.variant(SizeW::Bytes128) } pub fn bytes256(self) -> &'a mut W { self.variant(SizeW::Bytes256) } pub fn bytes512(self) -> &'a mut W { self.variant(SizeW::Bytes512) } pub fn bytes1024(self) -> &'a mut W { self.variant(SizeW::Bytes1024) } } pub(crate) struct MultiPacketSizeW<'a> { w: &'a mut W, } impl<'a> MultiPacketSizeW<'a> { pub unsafe fn bits(self, v: u16) -> &'a mut W { assert!(v < 16_384); const POS: u8 = 14; const MASK: u16 = 0x3fff; self.w.bits &= !((MASK as u32) << POS); self.w.bits |= ((v & MASK) as u32) << POS; self.w } } pub(crate) struct ByteCountW<'a> { w: &'a mut W, } impl<'a> ByteCountW<'a> { // Documentation is wrong on this field. Actually 14 bits from // offset 0. pub unsafe fn bits(self, v: u16) -> &'a mut W { assert!(v < 16_384); const POS: u8 = 0; const MASK: u16 = 0x3fff; self.w.bits &= !((MASK as u32) << POS); self.w.bits |= ((v & MASK) as u32) << POS; self.w } }