main: Add checks before sock send/recv are called

src/main.rs

@@ -140,8 +140,6 @@ fn main() -> ! {
                 laser.load_settings_from_summary(laser_settings);
             }
             State::MainLoop => {
-                let mut eth_is_pending = false;
-
                 laser.poll_and_update_output_current();
 
                 if thermostat.poll_adc() {
@@ -155,12 +153,16 @@ fn main() -> ! {
                     net::net::for_each(|mut socket, id| {
                         if net::net::eth_is_socket_active(socket) && net::net::eth_is_socket_connected(socket) {
                             if active_report[id] {
+                                if net::net::eth_can_sock_send(socket) {
                                     net::cmd_handler::send_status_report(
                                         eth_data_buffer,
                                         &mut laser,
                                         &mut thermostat,
                                         &mut socket,
                                     );
+                                } else {
+                                    debug!("Socket {:?} is not ready to send status report", id)
+                                }
                             }
                         } else {
                             active_report[id] = false;
@@ -169,13 +171,10 @@ fn main() -> ! {
 
                     thermostat.start_tec_readings_conversion();
                 }
-                cortex_m::interrupt::free(|cs| {
-                    eth_is_pending = net::net::is_pending(cs);
-                    net::net::clear_pending(cs);
-                });
-                if eth_is_pending {
+
                 net::net::for_each(|mut socket, id| {
                     if net::net::eth_is_socket_active(socket) && net::net::eth_is_socket_connected(socket) {
+                        if net::net::eth_can_sock_recv(socket) && net::net::eth_can_sock_send(socket) {
                             let bytes = net::net::eth_recv(eth_data_buffer, socket);
                             if bytes != 0 {
                                 info!("Ts: {:?}", sys_timer::now());
@@ -192,9 +191,11 @@ fn main() -> ! {
                                     &mut active_report[id],
                                 );
                             }
+                        } else {
+                            debug!("Socket {:?} is not ready to process command", id);
+                        }
                     }
                 })
-                };
             }
             State::SaveLdThermostatSettings => {
                 // State Transition

src/net/net.rs

@@ -1,7 +1,5 @@
-use core::{cell::RefCell,
-           mem::{self, MaybeUninit}};
+use core::mem::{self, MaybeUninit};
 
-use cortex_m::interrupt::{CriticalSection, Mutex};
 use log::{debug, info};
 use serde::{Deserialize, Serialize};
 use smoltcp::{iface::{self, Interface, SocketHandle, SocketSet, SocketStorage},
@@ -36,10 +34,6 @@ impl Default for IpSettings {
     }
 }
 
-/// Interrupt pending flag: set by the `ETH` interrupt handler, should
-/// be cleared before polling the interface.
-static NET_PENDING: Mutex<RefCell<bool>> = Mutex::new(RefCell::new(false));
-
 pub struct ServerHandle {
     socket_handles: [SocketHandle; NUM_OF_SOCKETS],
     socket_set: SocketSet<'static>,
@@ -230,10 +224,16 @@ impl ServerHandle {
     pub fn send(&mut self, buffer: &mut [u8], num_bytes: usize, socket_handles: SocketHandle) {
         let socket = self.socket_set.get_mut::<Socket>(socket_handles);
         if num_bytes > 0 {
-            socket.send_slice(&buffer[..num_bytes]).ok();
+            match socket.send_slice(&buffer[..num_bytes]) {
+                Ok(_) => {
                     self.poll_iface();
                     info!("Sent {} bytes.", num_bytes);
                 }
+                Err(err) => {
+                    info!("Bytes cannot be sent. Error: {:?}", err)
+                }
+            };
+        }
     }
 
     pub fn is_socket_connected(&mut self, socket_handles: SocketHandle) -> bool {
@@ -258,6 +258,14 @@ impl ServerHandle {
         let socket = self.socket_set.get_mut::<Socket>(socket_handles);
         socket.abort();
     }
+
+    pub fn can_send(&mut self, socket_handles: SocketHandle) -> bool {
+        self.socket_set.get_mut::<Socket>(socket_handles).can_send()
+    }
+
+    pub fn can_recv(&mut self, socket_handles: SocketHandle) -> bool {
+        self.socket_set.get_mut::<Socket>(socket_handles).can_recv()
+    }
 }
 
 use ieee802_3_miim::{phy::{lan87xxa::{LAN8720A, LAN8742A},
@@ -357,6 +365,26 @@ impl<M: Miim> EthernetPhy<M> {
     }
 }
 
+pub fn eth_can_sock_send(socket_handles: SocketHandle) -> bool {
+    unsafe {
+        if let Some(ref mut server_handle) = SERVER_HANDLE {
+            server_handle.can_send(socket_handles)
+        } else {
+            panic!("eth_check_if_sock_can_send is called before init");
+        }
+    }
+}
+
+pub fn eth_can_sock_recv(socket_handles: SocketHandle) -> bool {
+    unsafe {
+        if let Some(ref mut server_handle) = SERVER_HANDLE {
+            server_handle.can_recv(socket_handles)
+        } else {
+            panic!("eth_check_if_sock_can_recv is called before init");
+        }
+    }
+}
+
 pub fn eth_poll_link_status_and_update_link_speed() -> bool {
     unsafe {
         if let Some(ref mut server_handle) = SERVER_HANDLE {
@@ -457,22 +485,10 @@ pub fn for_each<F: FnMut(SocketHandle, usize)>(mut callback: F) {
 #[interrupt]
 fn ETH() {
     let interrupt_reason = stm32_eth::eth_interrupt_handler();
-    cortex_m::interrupt::free(|cs| {
+    cortex_m::interrupt::free(|_| {
         if interrupt_reason.rx {
-            *NET_PENDING.borrow(cs).borrow_mut() = true;
             eth_poll_iface();
         }
     });
     debug!("Ethernet Interrupt{:?}", interrupt_reason);
 }
-
-/// Has an interrupt occurred since last call to `clear_pending()`?
-pub fn is_pending(cs: &CriticalSection) -> bool {
-    *NET_PENDING.borrow(cs).borrow()
-}
-
-/// Clear the interrupt pending flag before polling the interface for
-/// data.
-pub fn clear_pending(cs: &CriticalSection) {
-    *NET_PENDING.borrow(cs).borrow_mut() = false;
-}