Merge pull request #14 from ntruchsess/dev

Fix an overflow and add blocking write (configurable)

Author: ntruchsess

UIPClient.cpp

@@ -158,18 +158,30 @@ size_t
 UIPClient::_write(struct uip_conn* conn, const uint8_t *buf, size_t size)
 {
   uip_userdata_t *u;
+  int remain = size;
+  uint16_t written;
+#if UIP_ATTEMPTS_ON_WRITE > 0
+  uint16_t attempts = UIP_ATTEMPTS_ON_WRITE;
+#endif
+  repeat:
   UIPEthernet.tick();
   if (conn && (u = (uip_userdata_t *)conn->appstate.user) && !(u->state & (UIP_CLIENT_CLOSE | UIP_CLIENT_CLOSED)))
     {
-      int remain = size;
-      uint16_t written;
       memhandle* p = _currentBlock(&u->packets_out[0]);
       if (*p == NOBLOCK)
         {
 newpacket:
           *p = UIPEthernet.network.allocBlock(UIP_SOCKET_DATALEN);
           if (*p == NOBLOCK)
-            goto ready;
+            {
+#if UIP_ATTEMPTS_ON_WRITE > 0
+              if ((--attempts)>0)
+#endif
+#if UIP_ATTEMPTS_ON_WRITE != 0
+                goto repeat;
+#endif
+              goto ready;
+            }
           u->out_pos = 0;
         }
 #ifdef UIPETHERNET_DEBUG_CLIENT
@@ -191,7 +203,15 @@ UIPClient::_write(struct uip_conn* conn, const uint8_t *buf, size_t size)
       if (remain > 0)
         {
           if (p==&u->packets_out[UIP_SOCKET_NUMPACKETS-1])
-            goto ready;
+            {
+#if UIP_ATTEMPTS_ON_WRITE > 0
+              if ((--attempts)>0)
+#endif
+#if UIP_ATTEMPTS_ON_WRITE != 0
+                goto repeat;
+#endif
+              goto ready;
+            }
           p++;
           goto newpacket;
         }
@@ -316,11 +336,6 @@ UIPClient::uip_callback(uip_tcp_appstate_t *s)
     }
   if (u)
     {
-      if (u->state & UIP_CLIENT_RESTART)
-        {
-          u->state &= ~UIP_CLIENT_RESTART;
-          uip_restart();
-        }
       if (uip_newdata())
         {
 #ifdef UIPETHERNET_DEBUG_CLIENT
@@ -358,6 +373,11 @@ UIPClient::uip_callback(uip_tcp_appstate_t *s)
             }
         }
 finish_newdata:
+      if (u->state & UIP_CLIENT_RESTART)
+        {
+          u->state &= ~UIP_CLIENT_RESTART;
+          uip_restart();
+        }
       // If the connection has been closed, save received but unread data.
       if (uip_closed() || uip_timedout())
         {
@@ -451,7 +471,7 @@ UIPClient::uip_callback(uip_tcp_appstate_t *s)
 memhandle*
 UIPClient::_currentBlock(memhandle* block)
 {
-  for(memhandle* end = block+UIP_SOCKET_NUMPACKETS; block < end; block++)
+  for(memhandle* end = block+UIP_SOCKET_NUMPACKETS-1; block < end; block++)
     if(*(block+1) == NOBLOCK)
       break;
   return block;

utility/Enc28J60Network.cpp

@@ -47,7 +47,6 @@ extern "C" {
 
 Enc28J60Network::Enc28J60Network() :
     MemoryPool(TXSTART_INIT+1, TXSTOP_INIT-TXSTART_INIT), // 1 byte in between RX_STOP_INIT and pool to allow prepending of controlbyte
-    status(0),
     bank(0xff)
 {
 }
@@ -268,7 +267,6 @@ uint16_t
 Enc28J60Network::readPacket(memhandle handle, memaddress position, uint8_t* buffer, uint16_t len)
 {
   len = setReadPtr(handle, position, len);
-  checkDMA();
   readBuffer(len, buffer);
   return len;
 }
@@ -322,15 +320,14 @@ Enc28J60Network::copyPacket(memhandle dest_pkt, memaddress dest_pos, memhandle s
   memblock *dest = &blocks[dest_pkt];
   memblock *src = src_pkt == UIP_RECEIVEBUFFERHANDLE ? &receivePkt : &blocks[src_pkt];
   memblock_mv_cb(dest->begin+dest_pos,src->begin+src_pos,len);
-  if (src_pkt == UIP_RECEIVEBUFFERHANDLE)
-    status |= DMANEWPACKET;
+  // Move the RX read pointer to the start of the next received packet
+  // This frees the memory we just read out
+  setERXRDPT();
 }
 
 void
 Enc28J60Network::memblock_mv_cb(uint16_t dest, uint16_t src, uint16_t len)
 {
-  checkDMA();
-
   //as ENC28J60 DMA is unable to copy single bytes:
   if (len == 1)
     {
@@ -372,35 +369,14 @@ Enc28J60Network::memblock_mv_cb(uint16_t dest, uint16_t src, uint16_t len)
       /* 4. Start the DMA copy by setting ECON1.DMAST. */
       writeOp(ENC28J60_BIT_FIELD_SET, ECON1, ECON1_DMAST);
 
-      status |= DMARUNNING;
-    }
-}
-
-void
-Enc28J60Network::checkDMA()
-{
-  if (status & DMARUNNING)
-    {
       // wait until runnig DMA is completed
       while (readOp(ENC28J60_READ_CTRL_REG, ECON1) & ECON1_DMAST);
-
-      if (status & DMANEWPACKET)
-        {
-          // Move the RX read pointer to the start of the next received packet
-          // This frees the memory we just read out
-          setERXRDPT();
-        }
-      status = 0;
     }
 }
 
 void
 Enc28J60Network::freePacket()
 {
-  // wait until runnig new-packet DMA is completed. This implicitly frees the packet.
-  if (status & DMANEWPACKET)
-    checkDMA();
-  else
     setERXRDPT();
 }
 
@@ -548,7 +524,6 @@ uint16_t
 Enc28J60Network::chksum(uint16_t sum, memhandle handle, memaddress pos, uint16_t len)
 {
   uint16_t t;
-  checkDMA();
   len = setReadPtr(handle, pos, len)-1;
   CSACTIVE;
   // issue read command

utility/Enc28J60Network.h

@@ -52,14 +52,11 @@ class Enc28J60Network : public MemoryPool
 {
 
 private:
-  uint8_t status;
   uint16_t nextPacketPtr;
   uint8_t bank;
 
   struct memblock receivePkt;
 
-  void checkDMA();
-
   uint8_t readOp(uint8_t op, uint8_t address);
   void writeOp(uint8_t op, uint8_t address, uint8_t data);
   uint16_t setReadPtr(memhandle handle, memaddress position, uint16_t len);

utility/uipethernet-conf.h

@@ -11,4 +11,8 @@
 #define UIP_CONF_UDP_CONNS       4
 #define UIP_UDP_NUMPACKETS       5
 
+/* number of attempts on write before returning number of bytes sent so far
+ * set to -1 to block until connection is closed by timeout */
+#define UIP_ATTEMPTS_ON_WRITE    -1
+
 #endif