try to move ethernet pdriver to a single file (not working at the moment)

FPGA/build/blinky.blif

@@ -0,0 +1,12 @@
+# Generated by Yosys 0.9+3521 (git sha1 12132b6850, g++ 9.3.0 -fPIC -Os)
+
+.model top
+.inputs key
+.outputs led
+.names $false
+.names $true
+1
+.names $undef
+.names $true led
+1 1
+.end

FPGA/makefile

@@ -0,0 +1,26 @@
+# Project setup
+PROJ      = blinky
+BUILD     = ./build
+DEVICE    = 8k
+FOOTPRINT = ct256
+
+# Files
+FILES = top.v
+
+.PHONY: all clean burn
+
+all:
+	# if build folder doesn't exist, create it
+	mkdir -p $(BUILD)
+	# synthesize using Yosys
+	yosys -p "synth_ice40 -top top -blif $(BUILD)/$(PROJ).blif" $(FILES)
+	# Place and route using arachne
+	arachne-pnr -d $(DEVICE) -P $(FOOTPRINT) -o $(BUILD)/$(PROJ).asc -p pinmap.pcf $(BUILD)/$(PROJ).blif
+	# Convert to bitstream using IcePack
+	icepack $(BUILD)/$(PROJ).asc $(BUILD)/$(PROJ).bin
+
+burn:
+	iceprog $(BUILD)/$(PROJ).bin
+
+clean:
+	rm build/*

FPGA/pinmap.pcf

@@ -0,0 +1,69 @@
+# example.pcf
+set_io --warn-no-port HW_CLK R9
+
+set_io --warn-no-port LED T15
+set_io --warn-no-port KEY T16
+
+# set_io --warn-no-port io0 R6
+# set_io --warn-no-port io1 T8
+# set_io --warn-no-port io2 T5
+# set_io --warn-no-port io3 R9
+# set_io --warn-no-port io4 R5
+# set_io --warn-no-port io5 T9
+# set_io --warn-no-port io6 T3
+# set_io --warn-no-port io7 R10
+# set_io --warn-no-port io8 R3
+# set_io --warn-no-port io9 T10
+# set_io --warn-no-port io10 T2
+# set_io --warn-no-port io11 T11
+# set_io --warn-no-port io12 R2
+# set_io --warn-no-port io13 T13
+# set_io --warn-no-port io14 T1
+# set_io --warn-no-port io15 T14
+
+
+set_io --warn-no-port ADC_DAT[0] J15
+set_io --warn-no-port ADC_DAT[1] K16
+set_io --warn-no-port ADC_DAT[2] K15
+set_io --warn-no-port ADC_DAT[3] L16
+set_io --warn-no-port ADC_DAT[4] M16
+set_io --warn-no-port ADC_DAT[5] M15
+set_io --warn-no-port ADC_DAT[6] N16
+set_io --warn-no-port ADC_DAT[7] P16
+set_io --warn-no-port ADC_CLK P15
+
+
+set_io --warn-no-port FSMC_ADD[0] A9
+set_io --warn-no-port FSMC_ADD[1] B9
+set_io --warn-no-port FSMC_ADD[2] A10
+set_io --warn-no-port FSMC_ADD[3] C10
+set_io --warn-no-port FSMC_ADD[4] C9
+set_io --warn-no-port FSMC_ADD[5] C8
+set_io --warn-no-port FSMC_ADD[6] C7
+set_io --warn-no-port FSMC_ADD[7] C11
+
+set_io --warn-no-port FSMC_DAT[0] B10
+set_io --warn-no-port FSMC_DAT[1] A11
+set_io --warn-no-port FSMC_DAT[2] B11
+set_io --warn-no-port FSMC_DAT[3] B12
+set_io --warn-no-port FSMC_DAT[4] A1
+set_io --warn-no-port FSMC_DAT[5] A2
+set_io --warn-no-port FSMC_DAT[6] C3
+set_io --warn-no-port FSMC_DAT[7] B3
+set_io --warn-no-port FSMC_DAT[8] B4
+set_io --warn-no-port FSMC_DAT[9] A5
+set_io --warn-no-port FSMC_DAT[10] B5
+set_io --warn-no-port FSMC_DAT[11] A6
+set_io --warn-no-port FSMC_DAT[12] B6
+set_io --warn-no-port FSMC_DAT[13] A7
+set_io --warn-no-port FSMC_DAT[14] B7
+set_io --warn-no-port FSMC_DAT[15] B8
+
+set_io --warn-no-port FSMC_NL C14
+set_io --warn-no-port FSMC_NWAIT B15
+set_io --warn-no-port FSMC_NOE B14
+set_io --warn-no-port FSMC_NWE A15
+set_io --warn-no-port FSMC_NBL[0] C13
+set_io --warn-no-port FSMC_NBL[1] C12
+set_io --warn-no-port FSMC_NE1 A16
+set_io --warn-no-port FSMC_CLK B13

FPGA/top.v

@@ -0,0 +1,59 @@
+module top (
+            HW_CLK,
+            LED,
+            KEY,
+            ADC_CLK,
+            ADC_DAT,
+            FSMC_CLK,
+            FSMC_ADD,
+            FSMC_DAT,
+            FSMC_NL,
+            FSMC_NWAIT,
+            FSMC_NOE,
+            FSMC_NWE,
+            FSMC_NBL,
+            FSMC_NE1
+        );
+
+    /* I/O */
+    input HW_CLK;
+    input KEY;
+    output LED;
+
+    input FSMC_NL;
+    input FSMC_NWAIT;
+    input FSMC_NOE;
+    input FSMC_NWE;
+    input FSMC_NE1;
+    input [1:0]FSMC_NBL;
+    input FSMC_CLK;
+    input [7:0]FSMC_ADD;
+    output [15:0]FSMC_DAT;
+
+    output ADC_CLK;
+    input [7:0]ADC_DAT;
+
+    reg [7:0] adc_result = 8'b0;
+    
+    /* Counter register */
+    reg [31:0] counter = 32'b0;
+    /* LED drivers */
+    assign LED = counter[24];
+    // assign LED = ~KEY;
+
+    /* always */
+    always @ (posedge HW_CLK) begin
+        counter <= counter + 1;
+        
+        FSMC_DAT = 200;
+        
+        ADC_CLK = ~ADC_CLK;
+    end
+
+    always @ (posedge ADC_CLK) begin
+        adc_result = ADC_DAT;
+
+        // FSMC_DAT = 200;
+    end
+
+endmodule

src/ethernet.rs

@@ -0,0 +1,202 @@
+use enc424j600::smoltcp_phy;
+
+use smoltcp::wire::{
+    EthernetAddress, IpAddress, IpCidr, Ipv6Cidr
+};
+use smoltcp::iface::{NeighborCache, EthernetInterfaceBuilder, EthernetInterface};
+use smoltcp::socket::{SocketSet, TcpSocket, TcpSocketBuffer};
+use core::str;
+use core::fmt::Write;
+
+use smoltcp::time::Instant;
+
+use cortex_m_rt::exception;
+
+///spi
+use stm32f1xx_hal::{
+    time::U32Ext,
+    delay::Delay
+};
+
+/// Timer
+use core::cell::RefCell;
+use cortex_m::interrupt::Mutex;
+use stm32f1xx_hal::{
+    time::MilliSeconds,
+    timer::{Timer, Event as TimerEvent},
+    rcc::Clocks,
+    stm32::SYST
+};
+
+/// Rate in Hz
+const TIMER_RATE: u32 = 20;
+/// Interval duration in milliseconds
+const TIMER_DELTA: u32 = 1000 / TIMER_RATE;
+/// Elapsed time in milliseconds
+static TIMER_MS: Mutex<RefCell<u32>> = Mutex::new(RefCell::new(0));
+
+/// Setup SysTick exception
+fn timer_setup(syst: SYST, clocks: Clocks) {
+    let timer = Timer::syst(syst, &clocks);
+    timer.start_count_down(TIMER_RATE.hz()).listen(TimerEvent::Update);
+}
+
+/// SysTick exception (Timer)
+#[exception]
+fn SysTick() {
+    cortex_m::interrupt::free(|cs| {
+        *TIMER_MS.borrow(cs)
+            .borrow_mut() += TIMER_DELTA;
+    });
+}
+
+/// Obtain current time in milliseconds
+pub fn timer_now() -> MilliSeconds {
+    let ms = cortex_m::interrupt::free(|cs| {
+        *TIMER_MS.borrow(cs)
+            .borrow()
+    });
+    ms.ms()
+}
+
+pub struct NetStorage {
+    ip_addrs: [IpCidr; 1],
+    neighbor_cache: [Option<(IpAddress, smoltcp::iface::Neighbor)>; 8],
+}
+
+static mut NET_STORE: NetStorage = NetStorage {
+    // Placeholder for the real IP address, which is initialized at runtime.
+    ip_addrs: [IpCidr::Ipv6(
+        Ipv6Cidr::SOLICITED_NODE_PREFIX,
+    )],
+    neighbor_cache: [None; 8],
+};
+
+pub fn ethernet_init<SpiEth> (
+    spi_eth: SpiEth, 
+    delay: Delay,
+    clocks: &Clocks
+)
+    // -> EthernetInterface<smoltcp_phy::SmoltcpDevice<SpiEth>>
+{
+    // Init controller
+    match spi_eth.reset(&mut delay) {
+        Ok(_) => {
+            // serial_tx.write_fmt(format_args!("Initializing Ethernet...\n")).unwrap();
+        }
+        Err(_) => {
+            panic!("Ethernet initialization failed!")
+        }
+    }
+
+    // Read MAC
+    let mut eth_mac_addr: [u8; 6] = [0; 6];
+    spi_eth.read_mac_addr(&mut eth_mac_addr);
+    for i in 0..6 {
+        let byte = eth_mac_addr[i];
+        match i {
+            // 0 => {
+            //     serial_tx.write_fmt(format_args!("MAC Address = {:02x}-", byte)).unwrap();
+            // },
+            // 1..=4 => {
+            //     serial_tx.write_fmt(format_args!("{:02x}-", byte)).unwrap();
+            // },
+            // 5 => {
+            //     serial_tx.write_fmt(format_args!("{:02x}\n", byte)).unwrap();
+            // },
+        _ => ()
+        };
+    }
+
+    // Init Rx/Tx buffers
+    spi_eth.init_rxbuf();
+    spi_eth.init_txbuf();
+    // serial_tx.write_fmt(format_args!("Ethernet controller initialized\n")).unwrap();
+
+    // Init smoltcp interface
+    let eth_iface = {
+        let device = smoltcp_phy::SmoltcpDevice::new(spi_eth);
+
+        let store = unsafe { &mut NET_STORE };
+        store.ip_addrs[0] = IpCidr::new(IpAddress::v4(192, 168, 1, 88), 24);
+        let neighbor_cache = NeighborCache::new(&mut store.neighbor_cache[..]);
+
+        EthernetInterfaceBuilder::new(device)
+            .ethernet_addr(EthernetAddress(eth_mac_addr))
+            .neighbor_cache(neighbor_cache)
+            .ip_addrs(&mut store.ip_addrs[..])
+            .finalize()
+    };
+    // serial_tx.write_fmt(format_args!("Ethernet interface initialized\n")).unwrap();
+
+    // Setup SysTick after releasing SYST from Delay
+    // Reference to stm32-eth:examples/ip.rs
+    timer_setup(delay.free(), *clocks);
+    // serial_tx.write_fmt(format_args!("Timer initialized\n")).unwrap();
+
+    // eth_iface
+    let iface = eth_iface;
+
+    let greet_socket = {
+        static mut TCP_SERVER_RX_DATA: [u8; 256] = [0; 256];
+        static mut TCP_SERVER_TX_DATA: [u8; 256] = [0; 256];
+        let tcp_rx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_RX_DATA[..] });
+        let tcp_tx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_TX_DATA[..] });
+        TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer)
+    };
+    let mut socket_set_entries = [None, None];
+    let mut socket_set = SocketSet::new(&mut socket_set_entries[..]);
+    let greet_handle = socket_set.add(greet_socket);
+    {
+        let store = unsafe { &mut NET_STORE };
+        // serial_tx.write_fmt(format_args!("TCP sockets will listen at {}\n", store.ip_addrs[0].address())).unwrap();
+    }
+
+    // Copied / modified from:
+    // smoltcp:examples/loopback.rs, examples/server.rs;
+    // stm32-eth:examples/ip.rs,
+    // git.m-labs.hk/M-Labs/tnetplug
+    loop {
+        // Poll
+        let now = timer_now().0;
+        let instant = Instant::from_millis(now as i64);
+        match iface.poll(&mut socket_set, instant) {
+            Ok(_) => {
+            },
+            Err(e) => {
+                // serial_tx.write_fmt(format_args!("[{}] Poll error: {:?}\n", instant, e)).unwrap();
+            }
+        }
+        // Control the "greeting" socket (:4321)
+        {
+            let mut socket = socket_set.get::<TcpSocket>(greet_handle);
+            if !socket.is_open() {
+                // serial_tx.write_fmt(format_args!("[{}] Listening to port 4321 for greeting, please connect to the port\n", instant)).unwrap();
+                socket.listen(4321).unwrap();
+                // socket.set_timeout(Some(smoltcp::time::Duration::from_millis(10000)));
+            }
+
+            if socket.can_send() {
+                let greeting = "Welcome to the server demo for STM32F103!";
+                write!(socket, "{}\n", greeting).unwrap();
+                // serial_tx.write_fmt(format_args!("[{}] Greeting sent, socket closed\n", instant)).unwrap();
+                socket.close();
+            }
+
+            if socket.can_recv() {
+                // serial_tx.write_fmt(format_args!("[{}] Received packet: {:?}\n", 
+                // instant, socket.recv(|buffer| {(buffer.len(), str::from_utf8(buffer).unwrap())}))).unwrap();
+            }
+        }
+    }
+}
+
+
+
+// pub fn ethernet_test<SpiEth>
+//     (mut iface: EthernetInterface<smoltcp_phy::SmoltcpDevice<SpiEth>>)
+// {
+//     // Copied / modified from smoltcp:
+//     // examples/loopback.rs
+
+// }

src/fpga.rs

@@ -0,0 +1,92 @@
+use embedded_hal::{
+    digital::v2::{OutputPin, InputPin},
+    blocking::spi::Transfer,
+    blocking::delay::DelayUs,
+};
+
+#[derive(Debug)]
+pub enum FPGAFlashError {
+    SPICommunicationError,
+    NegotiationError,
+    ResetStatusError,
+}
+
+const DATA: &'static [u8] = include_bytes!("../FPGA/build/blinky.bin");
+// const DATA: &'static [u8] = include_bytes!("../build/top.bin");
+
+// A public method to flash iCE40 FPGA on Humpback
+pub fn flash_ice40_fpga<SPI: Transfer<u8>,
+                        SS: OutputPin,
+                        RST: OutputPin,
+                        DELAY: DelayUs<u32>,
+                        DONE: InputPin>
+    (mut spi: SPI, mut ss: SS, mut creset: RST, cdone: DONE, mut delay: DELAY) -> Result<(), FPGAFlashError>
+{
+    // Data buffer setup
+    let mut dummy_byte :[u8; 1] = [0x00];
+    let mut dummy_13_bytes :[u8; 13] = [0x00; 13];
+
+    // Drive CRESET_B low
+    creset.set_low()
+            .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Drive SPI_SS_B low
+    ss.set_low()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Wait at least 200ns
+    delay.delay_us(1_u32);
+
+    // Drive CRESET_B high
+    creset.set_high()
+            .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Wait at least another 1200us to clear internal config memory
+    delay.delay_us(1200_u32);
+
+    // Before data transmission starts, check if C_DONE is truly low
+    // If C_DONE is high, the FPGA reset procedure is unsuccessful
+    match cdone.is_low() {
+        Ok(true) => {},
+        _ => return Err(FPGAFlashError::ResetStatusError),
+    };
+
+    // Set SPI_SS_B high
+    ss.set_high()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Send 8 dummy clock, effectively 1 byte of 0x00
+    spi.transfer(&mut dummy_byte)
+        .map_err(|_| FPGAFlashError::SPICommunicationError)?;
+
+    // Drive SPI_SS_B low
+    ss.set_low()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Send the whole image without interruption
+    for byte in DATA.into_iter() {
+        let mut single_byte_slice = [*byte];
+        spi.transfer(&mut single_byte_slice)
+            .map_err(|_| FPGAFlashError::SPICommunicationError)?;
+    }
+
+    // Drive SPI_SS_B high
+    ss.set_high()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Send at another 100 dummy clocks (choosing 13 bytes)
+    spi.transfer(&mut dummy_13_bytes)
+        .map_err(|_| FPGAFlashError::SPICommunicationError)?;
+
+    // Check the CDONE output from FPGA
+    // CDONE needs to be high
+    match cdone.is_high() {
+        Ok(true) => {},
+        _ => return Err(FPGAFlashError::ResetStatusError),
+    };
+
+    // Send at least another 49 clock cycles to activate IO pins (choosing same 13 bytes)
+    spi.transfer(&mut dummy_13_bytes).map_err(|_| FPGAFlashError::SPICommunicationError)?;
+    Ok(())
+
+}

src/main.rs

@@ -1,14 +1,19 @@
 #![no_std]
 #![no_main]
 
-// use cortex_m::{asm, singleton};
+use cortex_m::{singleton};
+
+pub mod ethernet;
+use ethernet::{
+    ethernet_init, 
+    // ethernet_test
+};
 
 pub mod serial;
-use core::str;
+// use core::str;
-use core::fmt::Write;
+// use core::fmt::Write;
 // use nb::block;
 extern crate panic_itm;
-// use cortex_m::{iprintln, iprint};
 use cortex_m_rt::entry;
 
 use embedded_hal::{
@@ -22,35 +27,20 @@ use stm32f1xx_hal::{
     flash::FlashExt,
     gpio::GpioExt,
     time::U32Ext,
-    // stm32::ITM,
     delay::Delay,
     spi::Spi,
     pac,
-    // adc,
+    adc,
     prelude::*
     // time::Hertz
 };
-use enc424j600::smoltcp_phy;
-
-use smoltcp::wire::{
-    EthernetAddress, IpAddress, IpCidr, Ipv6Cidr
-};
-use smoltcp::iface::{
-    NeighborCache, 
-    EthernetInterfaceBuilder, 
-    // EthernetInterface
-};
-use smoltcp::socket::{SocketSet, TcpSocket, TcpSocketBuffer};
 
 /// Timer
 use core::cell::RefCell;
 use cortex_m::interrupt::Mutex;
-use cortex_m_rt::exception;
+// use cortex_m_rt::exception;
 use stm32f1xx_hal::{
-    rcc::Clocks,
+    timer::{Timer},
-    time::MilliSeconds,
-    timer::{Timer, Event as TimerEvent},
-    stm32::SYST,
     serial::{
         Config, 
         Serial, 
@@ -61,38 +51,11 @@ use stm32f1xx_hal::{
     // pac::*
     // dma::Half
 };
-use smoltcp::time::Instant;
+use stm32f1xx_hal::{
-
+    gpio::{gpioc},
-/// Rate in Hz
+    pac::{interrupt, Interrupt, TIM3},
-const TIMER_RATE: u32 = 20;
+    timer::{CountDownTimer, Event},
-/// Interval duration in milliseconds
+};
-const TIMER_DELTA: u32 = 1000 / TIMER_RATE;
-/// Elapsed time in milliseconds
-static TIMER_MS: Mutex<RefCell<u32>> = Mutex::new(RefCell::new(0));
-
-/// Setup SysTick exception
-fn timer_setup(syst: SYST, clocks: Clocks) {
-    let timer = Timer::syst(syst, &clocks);
-    timer.start_count_down(TIMER_RATE.hz()).listen(TimerEvent::Update);
-}
-
-/// SysTick exception (Timer)
-#[exception]
-fn SysTick() {
-    cortex_m::interrupt::free(|cs| {
-        *TIMER_MS.borrow(cs)
-            .borrow_mut() += TIMER_DELTA;
-    });
-}
-
-/// Obtain current time in milliseconds
-pub fn timer_now() -> MilliSeconds {
-    let ms = cortex_m::interrupt::free(|cs| {
-        *TIMER_MS.borrow(cs)
-            .borrow()
-    });
-    ms.ms()
-}
 
 ///spi
 use stm32f1xx_hal::{
@@ -109,18 +72,36 @@ type SpiEth = enc424j600::Enc424j600<
     PC13<Output<PushPull>>
 >;
 
-pub struct NetStorage {
-    ip_addrs: [IpCidr; 1],
-    neighbor_cache: [Option<(IpAddress, smoltcp::iface::Neighbor)>; 8],
-}
 
-static mut NET_STORE: NetStorage = NetStorage {
+// A type definition for the GPIO pin to be used for our LED
-    // Placeholder for the real IP address, which is initialized at runtime.
+type LEDPIN = gpioc::PC0<Output<PushPull>>;
-    ip_addrs: [IpCidr::Ipv6(
+// Make LED pin globally available
-        Ipv6Cidr::SOLICITED_NODE_PREFIX,
+static G_LED: Mutex<RefCell<Option<LEDPIN>>> = Mutex::new(RefCell::new(None));
-    )],
+// Make timer interrupt registers globally available
-    neighbor_cache: [None; 8],
+static G_TIM: Mutex<RefCell<Option<CountDownTimer<TIM3>>>> = Mutex::new(RefCell::new(None));
-};
+// Define an interupt handler, i.e. function to call when interrupt occurs.
+// This specific interrupt will "trip" when the timer TIM2 times out
+#[interrupt]
+fn TIM3() {
+    static mut LED: Option<LEDPIN> = None;
+    static mut TIM: Option<CountDownTimer<TIM3>> = None;
+
+    let led = LED.get_or_insert_with(|| {
+        cortex_m::interrupt::free(|cs| {
+            // Move LED pin here, leaving a None in its place
+            G_LED.borrow(cs).replace(None).unwrap()
+        })
+    });
+
+    let tim = TIM.get_or_insert_with(|| {
+        cortex_m::interrupt::free(|cs| {
+            G_TIM.borrow(cs).replace(None).unwrap()
+        })
+    });
+
+    let _ = led.toggle();
+    let _ = tim.wait();
+}
 
 #[entry()]
 fn main() -> ! {
@@ -137,7 +118,7 @@ fn main() -> ! {
     let mut flash = dp.FLASH.constrain();
     let mut rcc = dp.RCC.constrain();
 
-    let dma1_chs = dp.DMA1.split(&mut rcc.ahb);
+    // let dma1_chs = dp.DMA1.split(&mut rcc.ahb);
 
     let clocks = rcc
         .cfgr
@@ -172,9 +153,10 @@ fn main() -> ! {
     );
 
     // let mut serial_tx = serial.split().0.with_dma(dma1_chs.4);
-    let mut serial_tx = serial.split().0;
+    let (mut serial_tx, mut _serial_rx) = serial.split();
 
 
+    // //ADC1
     // let dma_ch1 = dma1_chs.1;
     // // Setup ADC
     // let adc1 = adc::Adc::adc1(dp.ADC1, &mut rcc.apb2, clocks);
@@ -195,13 +177,6 @@ fn main() -> ! {
     // // let (_adc1, _adc_ch15, _dma_ch1) = adc_dma.split();
 
 
-    // Init ITM
-    // let mut itm = cp.ITM;
-    // let stim0 = &mut itm.stim[0];
-
-    // iprintln!(stim0,
-    //     "Eth TCP Server on STM32-F103 via NIC100/ENC424J600");
-
     // NIC100 / ENC424J600 Set-up
     let spi1 = dp.SPI1;
     
@@ -212,8 +187,6 @@ fn main() -> ! {
     let spi1_nss = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);
 
     // Create SPI1 for HAL
-    let eth_iface = {
-        let mut spi_eth = {
     let spi_eth_port = Spi::spi1(
         spi1,
         (spi1_sck, spi1_miso, spi1_mosi),
@@ -224,153 +197,27 @@ fn main() -> ! {
         clocks,
         &mut rcc.apb2,);
 
-            SpiEth::new(spi_eth_port, spi1_nss)
+    let spi_eth = SpiEth::new(spi_eth_port, spi1_nss).cpu_freq_mhz(72);
-                .cpu_freq_mhz(72)
-        };
 
-        // Init controller
+    ethernet_init(spi_eth, delay, &clocks);
-        match spi_eth.reset(&mut delay) {
-            Ok(_) => {
-                // iprintln!(stim0, "Initializing Ethernet...")
-                serial_tx.write_fmt(format_args!("Initializing Ethernet...\n")).unwrap();
-            }
-            Err(_) => {
-                panic!("Ethernet initialization failed!")
-            }
-        }
 
-        // Read MAC
-        let mut eth_mac_addr: [u8; 6] = [0; 6];
-        spi_eth.read_mac_addr(&mut eth_mac_addr).unwrap();
-        for i in 0..6 {
-            let byte = eth_mac_addr[i];
-            match i {
-                // 0 => iprint!(stim0, "MAC Address = {:02x}-", byte),
-                // 1..=4 => iprint!(stim0, "{:02x}-", byte),
-                // 5 => iprint!(stim0, "{:02x}\n", byte),
-                0 => {
-                    serial_tx.write_fmt(format_args!("MAC Address = {:02x}-", byte)).unwrap();
-                },
-                1..=4 => {
-                    serial_tx.write_fmt(format_args!("{:02x}-", byte)).unwrap();
-                },
-                5 => {
-                    serial_tx.write_fmt(format_args!("{:02x}\n", byte)).unwrap();
-                },
-            _ => ()
-            };
-        }
-
-        // Init Rx/Tx buffers
-        spi_eth.init_rxbuf().unwrap();
-        spi_eth.init_txbuf().unwrap();
-        // iprintln!(stim0, "Ethernet controller initialized");
-        serial_tx.write_fmt(format_args!("Ethernet controller initialized\n")).unwrap();
-
-        // Init smoltcp interface
-        let eth_iface = {
-            let device = smoltcp_phy::SmoltcpDevice::new(spi_eth);
-
-            let store = unsafe { &mut NET_STORE };
-            store.ip_addrs[0] = IpCidr::new(IpAddress::v4(192, 168, 1, 88), 24);
-            let neighbor_cache = NeighborCache::new(&mut store.neighbor_cache[..]);
-
-            EthernetInterfaceBuilder::new(device)
-                .ethernet_addr(EthernetAddress(eth_mac_addr))
-                .neighbor_cache(neighbor_cache)
-                .ip_addrs(&mut store.ip_addrs[..])
-                .finalize()
-        };
-        // iprintln!(stim0, "Ethernet interface initialized");
-        serial_tx.write_fmt(format_args!("Ethernet interface initialized\n")).unwrap();
-        
-        eth_iface
-    };
-
-    // Setup SysTick after releasing SYST from Delay
-    // Reference to stm32-eth:examples/ip.rs
-    timer_setup(delay.free(), clocks);
-    // iprintln!(stim0, "Timer initialized");
 
     let mut led = gpioc.pc0.into_push_pull_output(&mut gpioc.crl);
     led.set_high().unwrap();
+    // Move the pin into our global storage
+    cortex_m::interrupt::free(|cs| *G_LED.borrow(cs).borrow_mut() = Some(led));
+    // Set up a timer expiring after 1s
+    let mut timer = Timer::tim3(dp.TIM3, &clocks, &mut rcc.apb1).start_count_down(1.hz());
+    // Generate an interrupt when the timer expires
+    timer.listen(Event::Update);
+    // Move the timer into our global storage
+    cortex_m::interrupt::free(|cs| *G_TIM.borrow(cs).borrow_mut() = Some(timer));
+    unsafe {
+        cortex_m::peripheral::NVIC::unmask(Interrupt::TIM3);
+    }
+
 
     loop {
-        // let stim0 = &mut c.resources.itm.stim[0];
+        // ethernet_test();
-        let mut iface = eth_iface;
-
-        // Copied / modified from smoltcp:
-        // examples/loopback.rs
-        let echo_socket = {
-            static mut TCP_SERVER_RX_DATA: [u8; 1024] = [0; 1024];
-            static mut TCP_SERVER_TX_DATA: [u8; 1024] = [0; 1024];
-            let tcp_rx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_RX_DATA[..] });
-            let tcp_tx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_TX_DATA[..] });
-            TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer)
-        };
-        let greet_socket = {
-            static mut TCP_SERVER_RX_DATA: [u8; 256] = [0; 256];
-            static mut TCP_SERVER_TX_DATA: [u8; 256] = [0; 256];
-            let tcp_rx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_RX_DATA[..] });
-            let tcp_tx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_TX_DATA[..] });
-            TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer)
-        };
-        let mut socket_set_entries = [None, None];
-        let mut socket_set = SocketSet::new(&mut socket_set_entries[..]);
-        let greet_handle = socket_set.add(greet_socket);
-        {
-            let store = unsafe { &mut NET_STORE };
-            // iprintln!(stim0,
-            //     "TCP sockets will listen at {}", store.ip_addrs[0].address());
-        serial_tx.write_fmt(format_args!("TCP sockets will listen at {}\n", store.ip_addrs[0].address())).unwrap();
-        }
-
-        // Copied / modified from:
-        // smoltcp:examples/loopback.rs, examples/server.rs;
-        // stm32-eth:examples/ip.rs,
-        // git.m-labs.hk/M-Labs/tnetplug
-        loop {
-            // Poll
-            let now = timer_now().0;
-            let instant = Instant::from_millis(now as i64);
-            match iface.poll(&mut socket_set, instant) {
-                Ok(_) => {
-                },
-                Err(e) => {
-                    // iprintln!(stim0, "[{}] Poll error: {:?}", instant, e)
-                    serial_tx.write_fmt(format_args!("[{}] Poll error: {:?}\n", instant, e)).unwrap();
-                }
-            }
-            // Control the "greeting" socket (:4321)
-            {
-                let mut socket = socket_set.get::<TcpSocket>(greet_handle);
-                if !socket.is_open() {
-                    // iprintln!(stim0,
-                    //     "[{}] Listening to port 4321 for greeting, \
-                    //     please connect to the port", instant);
-                    serial_tx.write_fmt(format_args!("[{}] Listening to port 4321 for greeting, please connect to the port\n", instant)).unwrap();
-                    socket.listen(4321).unwrap();
-                    // socket.set_timeout(Some(smoltcp::time::Duration::from_millis(10000)));
-                }
-
-                if socket.can_send() {
-                    let greeting = "Welcome to the server demo for STM32F103!";
-                    write!(socket, "{}\n", greeting).unwrap();
-                    // iprintln!(stim0,
-                    //     "[{}] Greeting sent, socket closed", instant);
-                    serial_tx.write_fmt(format_args!("[{}] Greeting sent, socket closed\n", instant)).unwrap();
-                    socket.close();
-                }
-
-                if socket.can_recv() {
-                    // iprintln!(stim0,
-                    // "[{}] Received packet: {:?}", instant, socket.recv(|buffer| {
-                    //     (buffer.len(), str::from_utf8(buffer).unwrap())
-                    // }));
-                    serial_tx.write_fmt(format_args!("[{}] Received packet: {:?}\n", 
-                    instant, socket.recv(|buffer| {(buffer.len(), str::from_utf8(buffer).unwrap())}))).unwrap();
-                }
-            }
-        }
     }
 }