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//! Enhanced transmit buffer descriptor layout and fields.
use ral_registers::RWRegister;
#[repr(C)]
pub struct TxBD {
pub data_length: RWRegister<u16>,
pub flags: RWRegister<u16>,
pub data_buffer_pointer: RWRegister<u32>,
pub errors: RWRegister<u16>,
pub control: RWRegister<u16>,
pub launch_time: RWRegister<u32>,
_reserved0: [u16; 1],
pub last_bdu: RWRegister<u16>,
pub timestamp_1588: RWRegister<u32>,
_reserved1: [u16; 4],
}
bdfields!(flags, u16,
ready [ offset = 15, bits = 1, ],
to1 [ offset = 14, bits = 1, ],
wrap [ offset = 13, bits = 1, ],
to2 [ offset = 12, bits = 1, ],
last_in [ offset = 11, bits = 1, ],
transmit_crc [ offset = 10, bits = 1, ],
);
bdfields!(errors, u16,
transmit [ offset = 15, bits = 1, ],
underflow [ offset = 13, bits = 1, ],
excess_collision [ offset = 12, bits = 1, ],
frame_error [ offset = 11, bits = 1, ],
late_collision [ offset = 10, bits = 1, ],
overflow [ offset = 9, bits = 1, ],
timestamp [ offset = 8, bits = 1, ],
);
bdfields!(control, u16,
interrupt [ offset = 14, bits = 1, ],
timestamp [ offset = 13, bits = 1, ],
pins [ offset = 12, bits = 1, ],
iins [ offset = 11, bits = 1, ],
utlt [ offset = 8, bits = 1, ],
ftype [ offset = 4, bits = 4, NON_AVB = 0, AVB_A = 1, AVB_B = 2 ],
);
bdfields!(last_bdu, u16,
last_bdu [ offset = 15, bits = 1, ],
);
#[cfg(test)]
mod tests {
use super::TxBD;
use std::ptr::addr_of;
fn zeroed() -> TxBD {
// Safety: zero bitpattern is fine for primitive fields.
unsafe { core::mem::MaybeUninit::zeroed().assume_init() }
}
#[test]
fn field_offsets() {
let txbd = zeroed();
let start = &txbd as *const _ as *const u8;
assert_eq!(unsafe { start.add(0x0) }, addr_of!(txbd.data_length).cast());
assert_eq!(unsafe { start.add(0x2) }, addr_of!(txbd.flags).cast());
assert_eq!(
unsafe { start.add(0x4) },
addr_of!(txbd.data_buffer_pointer).cast()
);
assert_eq!(unsafe { start.add(0x8) }, addr_of!(txbd.errors).cast());
assert_eq!(unsafe { start.add(0xA) }, addr_of!(txbd.control).cast());
assert_eq!(unsafe { start.add(0xC) }, addr_of!(txbd.launch_time).cast());
assert_eq!(unsafe { start.add(0x12) }, addr_of!(txbd.last_bdu).cast());
assert_eq!(
unsafe { start.add(0x14) },
addr_of!(txbd.timestamp_1588).cast()
);
}
#[test]
fn bdfields_enum() {
let txbd = zeroed();
ral_registers::modify_reg!(super, &txbd, control, ftype: AVB_B);
assert_eq!(txbd.control.read(), 0x2 << 4);
ral_registers::modify_reg!(super, &txbd, control, interrupt: 1);
assert_eq!(txbd.control.read(), 0x2 << 4 | 1 << 14);
ral_registers::modify_reg!(super, &txbd, control, ftype: 0);
assert_eq!(txbd.control.read(), 1 << 14);
}
}
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