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Validate FCS in fifo_read() and refactor tests.

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Adding TestHarnass to declutter the tests.
Also added a test for FCS and SPI_CRC.
This commit is contained in:
René van Dorst
2023-08-26 01:29:06 +02:00
parent 7f7256050c
commit 13a0be6289
3 changed files with 307 additions and 175 deletions
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29
embassy-net-adin1110/src/crc32.rs
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@ -257,29 +257,30 @@ pub const CRC32R_LOOKUP_TABLE: [u32; 256] = [
0x2D02_EF8D,
];
/// Generate Ethernet Frame Check Sequence
#[allow(non_camel_case_types)]
#[derive(Debug)]
pub struct ETH_FSC(pub u32);
pub struct ETH_FCS(pub u32);
impl ETH_FSC {
impl ETH_FCS {
pub const CRC32_OK: u32 = 0x2144_df1c;
#[must_use]
pub fn new(data: &[u8]) -> Self {
let fsc = data.iter().fold(u32::MAX, |crc, byte| {
let fcs = data.iter().fold(u32::MAX, |crc, byte| {
let idx = u8::try_from(crc & 0xFF).unwrap() ^ byte;
CRC32R_LOOKUP_TABLE[usize::from(idx)] ^ (crc >> 8)
}) ^ u32::MAX;
Self(fsc)
Self(fcs)
}
#[must_use]
pub fn update(self, data: &[u8]) -> Self {
let fsc = data.iter().fold(self.0 ^ u32::MAX, |crc, byte| {
let fcs = data.iter().fold(self.0 ^ u32::MAX, |crc, byte| {
let idx = u8::try_from(crc & 0xFF).unwrap() ^ byte;
CRC32R_LOOKUP_TABLE[usize::from(idx)] ^ (crc >> 8)
}) ^ u32::MAX;
Self(fsc)
Self(fcs)
}
#[must_use]
@ -319,24 +320,24 @@ mod tests {
];
// Packet A
let own_crc = ETH_FSC::new(&packet_a[0..60]);
let own_crc = ETH_FCS::new(&packet_a[0..60]);
let crc_bytes = own_crc.hton_bytes();
println!("{:08x} {:02x?}", own_crc.0, crc_bytes);
assert_eq!(&crc_bytes, &packet_a[60..64]);
let own_crc = ETH_FSC::new(packet_a);
let own_crc = ETH_FCS::new(packet_a);
println!("{:08x}", own_crc.0);
assert_eq!(own_crc.0, ETH_FSC::CRC32_OK);
assert_eq!(own_crc.0, ETH_FCS::CRC32_OK);
// Packet B
let own_crc = ETH_FSC::new(&packet_b[0..60]);
let own_crc = ETH_FCS::new(&packet_b[0..60]);
let crc_bytes = own_crc.hton_bytes();
println!("{:08x} {:02x?}", own_crc.0, crc_bytes);
assert_eq!(&crc_bytes, &packet_b[60..64]);
let own_crc = ETH_FSC::new(packet_b);
let own_crc = ETH_FCS::new(packet_b);
println!("{:08x}", own_crc.0);
assert_eq!(own_crc.0, ETH_FSC::CRC32_OK);
assert_eq!(own_crc.0, ETH_FCS::CRC32_OK);
}
#[test]
@ -349,9 +350,9 @@ mod tests {
];
let (part_a, part_b) = full_data.split_at(16);
let crc_partially = ETH_FSC::new(part_a).update(part_b);
let crc_partially = ETH_FCS::new(part_a).update(part_b);
let crc_full = ETH_FSC::new(full_data);
let crc_full = ETH_FCS::new(full_data);
assert_eq!(crc_full.0, crc_partially.0);
}