hw_rev: Generate random mac address on rev0_3

Cargo.lock

@@ -154,6 +154,21 @@ dependencies = [
  "cortex-m",
 ]
 
+[[package]]
+name = "crc"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86ec7a15cbe22e59248fc7eadb1907dab5ba09372595da4d73dd805ed4417dfe"
+dependencies = [
+ "crc-catalog",
+]
+
+[[package]]
+name = "crc-catalog"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19d374276b40fb8bbdee95aef7c7fa6b5316ec764510eb64b8dd0e2ed0d7e7f5"
+
 [[package]]
 name = "critical-section"
 version = "1.1.2"
@@ -385,6 +400,7 @@ dependencies = [
  "cortex-m-log",
  "cortex-m-rt",
  "cortex-m-semihosting 0.5.0",
+ "crc",
  "fugit",
  "ieee802_3_miim",
  "log",

Cargo.toml

@@ -36,6 +36,7 @@ miniconf = "0.9.0"
 serde = { version = "1.0.158", features = ["derive"], default-features = false }
 sfkv = "0.1"
 bit_field = "0.10"
+crc = "3.0.1"
 byteorder = { version = "1", default-features = false }
 [features]
 semihosting = ["cortex-m-log/semihosting"]

src/device/boot.rs

@@ -43,7 +43,7 @@ pub fn bootup(
 
     sys_timer::setup(core_perif.SYST, clocks);
 
-    let (eth_pins, eth_mgmt_pins, usb, current_source_phy, ad7172_phy, max1968_phy, pd_mon_phy) = gpio::setup(
+    let (mut hw_rev, eth_pins, eth_mgmt_pins, usb, current_source_phy, ad7172_phy, max1968_phy, pd_mon_phy) = gpio::setup(
         clocks,
         perif.TIM4,
         perif.GPIOA,
@@ -84,13 +84,14 @@ pub fn bootup(
     let flash_store = flash_store::store(perif.FLASH);
 
     debug!("Setting up ETH");
+    let mac_addr = hw_rev.get_mac_address();
     let ethernet_parts_in = stm32_eth::PartsIn {
         dma: perif.ETHERNET_DMA,
         mac: perif.ETHERNET_MAC,
         mmc: perif.ETHERNET_MMC,
         ptp: perif.ETHERNET_PTP,
     };
-    ServerHandle::new(eth_pins, eth_mgmt_pins, ethernet_parts_in, clocks);
+    ServerHandle::new(eth_pins, eth_mgmt_pins, ethernet_parts_in, clocks, mac_addr);
 
     debug!("Setting Watchdog");
     let mut wd = IndependentWatchdog::new(perif.IWDG);

src/device/gpio.rs

@@ -37,6 +37,7 @@ pub fn setup(
     otg_fs_device: OTG_FS_DEVICE,
     otg_fs_pwrclk: OTG_FS_PWRCLK,
 ) -> (
+    HWRev,
     EthernetPins,
     EthernetMgmtPins,
     USB,
@@ -158,5 +159,5 @@ pub fn setup(
         gpioa.pa15.into_push_pull_output(),
     ).unwrap();
 
-    (eth_pins, eth_mgmt_pins, usb, current_source_phy, ad7172_phy, max1968_phy, pd_mon_phy)
+    (hw_rev, eth_pins, eth_mgmt_pins, usb, current_source_phy, ad7172_phy, max1968_phy, pd_mon_phy)
 }

src/device/hw_rev.rs

@@ -1,5 +1,8 @@
-use stm32f4xx_hal::gpio::{Input, Output, PushPull, PE10, PE11, PE8, PE9};
+use stm32f4xx_hal::gpio::{Input, PE10, PE11, PE8, PE9};
 use crate::device::sys_timer::sleep;
+use stm32f4xx_hal::signature;
+use crc::{Crc, CRC_24_BLE};
+
 pub struct HwRevPins{
     pub h0: PE8<Input>,
     pub h1: PE9<Input>,
@@ -32,4 +35,28 @@ impl HWRev {
             sleep(5000);
         }
     }
+
+    /// On Rev0_3, it lacks pre-allocated Mac Addresses accessible on PCB.
+    ///     This functions generate a random Mac Address with 96bit unique UUID inside STM32
+    ///     See Issue #36 on Kirdy Hw Repo
+    pub fn get_mac_address(&mut self) -> [u8; 6] {
+        if self.major == 0 && self.minor == 3 {
+            let uid = signature::Uid::get();
+            let mut uid_data: [u8; 12] = [0; 12];
+            uid_data[0] = uid.x() as u8;
+            uid_data[1] = (uid.x() >> 8) as u8;
+            uid_data[2] = uid.y() as u8;
+            uid_data[3] = (uid.y() >> 8) as u8;
+            uid_data[4..11].clone_from_slice(uid.lot_num().as_bytes());
+
+            let crc: Crc<u32> = Crc::<u32>::new(&CRC_24_BLE);
+            let mut digest = crc.digest();
+            digest.update(&uid_data);
+            let crc24 = digest.finalize();
+
+            [ 0x02, 0xE0, 0xD5, (crc24 >> 16) as u8, (crc24 >> 8) as u8, (crc24 as u8)]
+        } else {
+            unimplemented!()
+        }
+    }
 }

src/net/net.rs

@@ -35,7 +35,6 @@ const ADDRESS: (IpAddress, u16) = (
     )),
     1337,
 );
-const MAC: [u8; 6] = [0x02, 0x5f, 0x25, 0x37, 0x93, 0x0e];
 
 /// Interrupt pending flag: set by the `ETH` interrupt handler, should
 /// be cleared before polling the interface.
@@ -88,6 +87,7 @@ impl ServerHandle {
         eth_mgmt_pins: EthernetMgmtPins,
         ethernet_parts_in: PartsIn,
         clocks: Clocks,
+        mac_addr: [u8; 6]
     ) {        
         let rx_ring = unsafe { RX_RING.get_or_insert(Default::default()) };
         let tx_ring = unsafe { TX_RING.get_or_insert(Default::default()) };
@@ -119,9 +119,10 @@ impl ServerHandle {
         let tx_buffer = SocketBuffer::new(&mut tcp_socket_storage.tx_storage[..]);
         let socket = Socket::new(rx_buffer, tx_buffer);
 
-        let config = iface::Config::new(EthernetAddress::from_bytes(&MAC).into());
+        let config = iface::Config::new(EthernetAddress::from_bytes(&mac_addr).into());
         let mut iface = Interface::new(config, &mut &mut dma, smoltcp::time::Instant::ZERO);
-        iface.set_hardware_addr(EthernetAddress(MAC).into());
+        iface.set_hardware_addr(EthernetAddress(mac_addr).into());
+        debug!("MAC ADDRESS: {:02X?}", EthernetAddress(mac_addr));
 
         iface.update_ip_addrs(|addr| {
             addr.push(IP_INIT).unwrap();