add config module

firmware/src/config.rs

@@ -0,0 +1,87 @@
+use eeprom;
+use crc32;
+use smoltcp::wire::IpAddress;
+
+const MAGIC: u8 = 0x54;
+
+struct EepromReader {
+    buffer: [u8; eeprom::BLOCK_LEN]
+}
+
+impl EepromReader {
+    fn new() -> EepromReader {
+        EepromReader {
+            buffer: [0; eeprom::BLOCK_LEN]
+        }
+    }
+
+    fn read_payload_block<'a>(&'a mut self, block: u16) -> bool {
+        eeprom::read_block(&mut self.buffer, block);
+
+        if self.buffer[0] != MAGIC {
+            return false;
+        }
+        let cksum = self.buffer[0] as u32 | (self.buffer[1] as u32) << 8 |
+                   (self.buffer[2] as u32) << 16 | (self.buffer[3] as u32) << 24;
+        if crc32::checksum_ieee(&self.buffer[0..self.buffer.len()-4]) != cksum {
+            return false;
+        }
+        true
+    }
+    
+    fn read_payload<'a>(&'a mut self) -> Result<&'a [u8], ()> {
+        let mut ok = self.read_payload_block(0);
+        if !ok {
+            ok = self.read_payload_block(1);
+        }
+        if ok {
+            Ok(&self.buffer[1..self.buffer.len()-4])
+        } else {
+            Err(())
+        }
+    }
+}
+
+fn write_eeprom_payload(payload: &[u8]) {
+    let mut buffer: [u8; eeprom::BLOCK_LEN] = [0; eeprom::BLOCK_LEN];
+    buffer[0] = MAGIC;
+    buffer[1..payload.len()+1].copy_from_slice(payload);
+    let len = buffer.len();
+    let cksum = crc32::checksum_ieee(&buffer[0..len-4]);
+    buffer[len-4] = cksum as u8;
+    buffer[len-3] = (cksum >> 8) as u8;
+    buffer[len-2] = (cksum >> 16) as u8;
+    buffer[len-1] = (cksum >> 24) as u8;
+    eeprom::write_block(&buffer, 0);
+    eeprom::write_block(&buffer, 1);
+}
+
+pub struct Config {
+    pub ip: IpAddress,
+}
+
+impl Config {
+    pub fn new() -> Config {
+        Config {
+            ip: IpAddress::v4(192, 168, 69, 1)
+        }
+    }
+    
+    pub fn load(&mut self) {
+        let mut reader = EepromReader::new();
+        let payload = reader.read_payload();
+        if payload.is_ok() {
+            let payload = payload.unwrap();
+            self.ip = IpAddress::v4(payload[0], payload[1], payload[2], payload[3]);
+        }
+    }
+    
+    pub fn save(&self) {
+        let mut payload: [u8; 4] = [0; 4];
+        let ip4 = match self.ip {
+            IpAddress::Ipv4(x) => x.0,
+            _ => panic!("unsupported network address")
+        };
+        payload[0..4].copy_from_slice(&ip4);
+    }
+}

firmware/src/crc32.rs

@@ -0,0 +1,49 @@
+// Based on crc 1.4.0 by mrhooray
+
+static IEEE_TABLE: [u32; 256] = [
+    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+    0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+    0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+    0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+    0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+    0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+    0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+    0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+    0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+    0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+    0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+    0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+    0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+    0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+    0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+    0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+    0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+    0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+    0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+    0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, 
+];
+
+pub fn update(mut value: u32, table: &[u32; 256], bytes: &[u8]) -> u32 {
+    value = !value;
+    for &i in bytes.iter() {
+        value = table[((value as u8) ^ i) as usize] ^ (value >> 8)
+    }
+    !value
+}
+
+pub fn checksum_ieee(bytes: &[u8]) -> u32 {
+    return update(0, &IEEE_TABLE, bytes);
+}
+

firmware/src/main.rs

@@ -40,6 +40,8 @@ pub fn panic_fmt(args: core::fmt::Arguments, file: &'static str, line: u32) -> !
 #[macro_use]
 mod board;
 mod eeprom;
+mod crc32;
+mod config;
 mod ethmac;
 mod pid;
 mod loop_anode;
@@ -105,6 +107,10 @@ macro_rules! create_socket {
 fn main() {
     board::init();
 
+    let mut config = config::Config::new();
+    eeprom::init();
+    config.load();
+
     cortex_m::interrupt::free(|cs| {
         let mut loop_anode = LOOP_ANODE.borrow(cs).borrow_mut();
         let mut loop_cathode = LOOP_CATHODE.borrow(cs).borrow_mut();