patch #8435: Implementing mEDBG CMSIS-DAP protocol

* usb_libusb.c: Add endpoint IDs for Xplained Mini, correctly
transfer trailing ZLP when needed
* avrdude.conf.in (xplainedmini, xplainedmini_dw): New entries.
* jtag3.c (jtag3_edbg_send, jtag3_edbg_recv_frame): Implement
fragmentation needed for the 64-byte EP size of the Xplained Mini




git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1369 81a1dc3b-b13d-400b-aceb-764788c761c2

ChangeLog

@@ -0,0 +1,9 @@
+2016-02-15  Joerg Wunsch <j.gnu@uriah.heep.sax.de>
+
+	patch #8435: Implementing mEDBG CMSIS-DAP protocol
+	* usb_libusb.c: Add endpoint IDs for Xplained Mini, correctly
+	transfer trailing ZLP when needed
+	* avrdude.conf.in (xplainedmini, xplainedmini_dw): New entries.
+	* jtag3.c (jtag3_edbg_send, jtag3_edbg_recv_frame): Implement
+	fragmentation needed for the 64-byte EP size of the Xplained Mini
+

NEWS

@@ -18,8 +18,12 @@ Current:
 
   * New programmers supported:
 
+    - Atmel mEDBG: xplainedmini, xplainedmini_dw
+
   * Bugfixes
 
+    - patch #8435: Implementing mEDBG CMSIS-DAP protocol
+
   * Internals:
 
 

avrdude.conf.in

@@ -1094,6 +1094,22 @@ programmer
   usbpid = 0x2111;
 ;
 
+programmer
+  id    = "xplainedmini";
+  desc  = "Atmel AVR XplainedMini in ISP mode";
+  type  = "jtagice3_isp";
+  connection_type = usb;
+  usbpid = 0x2145;
+;
+
+programmer
+  id    = "xplainedmini_dw";
+  desc  = "Atmel AVR XplainedMini in debugWIRE mode";
+  type  = "jtagice3_dw";
+  connection_type = usb;
+  usbpid = 0x2145;
+;
+
 programmer
   id    = "atmelice";
   desc  = "Atmel-ICE (ARM/AVR) in JTAG mode";

jtag3.c

@@ -446,27 +446,50 @@ static int jtag3_edbg_send(PROGRAMMER * pgm, unsigned char * data, size_t len)
   avrdude_message(MSG_DEBUG, "\n%s: jtag3_edbg_send(): sending %lu bytes\n",
 	    progname, (unsigned long)len);
 
-  if (len + 8 > USBDEV_MAX_XFER_3)
+  /* 4 bytes overhead for CMD, fragment #, and length info */
+  int max_xfer = pgm->fd.usb.max_xfer;
+  int nfragments = (len + max_xfer - 1) / max_xfer;
+  if (nfragments > 1)
     {
-      avrdude_message(MSG_INFO, "%s: jtag3_edbg_send(): Fragmentation not (yet) implemented!\n",
+      avrdude_message(MSG_DEBUG, "%s: jtag3_edbg_send(): fragmenting into %d packets\n",
-                      progname);
+                      progname, nfragments);
-      return -1;
     }
+  int frag;
+  for (frag = 0; frag < nfragments; frag++)
+    {
+      int this_len;
+
+      /* All fragments have the (CMSIS-DAP layer) CMD, the fragment
+       * identifier, and the length field. */
       buf[0] = EDBG_VENDOR_AVR_CMD;
-  buf[1] = (1 << 4) | 1;	/* first out of a total of 1 fragments */
+      buf[1] = ((frag + 1) << 4) | nfragments;
-  buf[2] = (len + 4) >> 8;
+
-  buf[3] = (len + 4) & 0xff;
+      if (frag == 0)
+        {
+          /* Only first fragment has TOKEN and seq#, thus four bytes
+           * less payload than subsequent fragments. */
+          this_len = len < max_xfer - 8? len: max_xfer - 8;
+          buf[2] = (this_len + 4) >> 8;
+          buf[3] = (this_len + 4) & 0xff;
           buf[4] = TOKEN;
           buf[5] = 0;                   /* dummy */
           u16_to_b2(buf + 6, PDATA(pgm)->command_sequence);
-  memcpy(buf + 8, data, len);
+          memcpy(buf + 8, data, this_len);
+        }
+      else
+        {
+          this_len = len < max_xfer - 4? len: max_xfer - 4;
+          buf[2] = (this_len) >> 8;
+          buf[3] = (this_len) & 0xff;
+          memcpy(buf + 4, data, this_len);
+        }
 
-  if (serial_send(&pgm->fd, buf, USBDEV_MAX_XFER_3) != 0) {
+      if (serial_send(&pgm->fd, buf, max_xfer) != 0) {
         avrdude_message(MSG_INFO, "%s: jtag3_edbg_send(): failed to send command to serial port\n",
                         progname);
         return -1;
       }
-  rv = serial_recv(&pgm->fd, status, USBDEV_MAX_XFER_3);
+      rv = serial_recv(&pgm->fd, status, max_xfer);
 
       if (rv < 0) {
         /* timeout in receive */
@@ -474,12 +497,16 @@ static int jtag3_edbg_send(PROGRAMMER * pgm, unsigned char * data, size_t len)
                         progname);
         return -1;
       }
-  if (status[0] != EDBG_VENDOR_AVR_CMD || status[1] != 0x01)
+      if (status[0] != EDBG_VENDOR_AVR_CMD ||
+          (frag == nfragments - 1 && status[1] != 0x01))
         {
           /* what to do in this case? */
           avrdude_message(MSG_INFO, "%s: jtag3_edbg_send(): Unexpected response 0x%02x, 0x%02x\n",
                           progname, status[0], status[1]);
         }
+      data += this_len;
+      len -= this_len;
+    }
 
   return 0;
 }
@@ -501,13 +528,13 @@ static int jtag3_edbg_prepare(PROGRAMMER * pgm)
 
   buf[0] = CMSISDAP_CMD_CONNECT;
   buf[1] = CMSISDAP_CONN_SWD;
-  if (serial_send(&pgm->fd, buf, USBDEV_MAX_XFER_3) != 0) {
+  if (serial_send(&pgm->fd, buf, pgm->fd.usb.max_xfer) != 0) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_prepare(): failed to send command to serial port\n",
                     progname);
     return -1;
   }
-  rv = serial_recv(&pgm->fd, status, USBDEV_MAX_XFER_3);
+  rv = serial_recv(&pgm->fd, status, pgm->fd.usb.max_xfer);
-  if (rv != USBDEV_MAX_XFER_3) {
+  if (rv != pgm->fd.usb.max_xfer) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_prepare(): failed to read from serial port (%d)\n",
                     progname, rv);
     return -1;
@@ -522,13 +549,13 @@ static int jtag3_edbg_prepare(PROGRAMMER * pgm)
   buf[0] = CMSISDAP_CMD_LED;
   buf[1] = CMSISDAP_LED_CONNECT;
   buf[2] = 1;
-  if (serial_send(&pgm->fd, buf, USBDEV_MAX_XFER_3) != 0) {
+  if (serial_send(&pgm->fd, buf, pgm->fd.usb.max_xfer) != 0) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_prepare(): failed to send command to serial port\n",
                     progname);
     return -1;
   }
-  rv = serial_recv(&pgm->fd, status, USBDEV_MAX_XFER_3);
+  rv = serial_recv(&pgm->fd, status, pgm->fd.usb.max_xfer);
-  if (rv != USBDEV_MAX_XFER_3) {
+  if (rv != pgm->fd.usb.max_xfer) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_prepare(): failed to read from serial port (%d)\n",
                     progname, rv);
     return -1;
@@ -560,13 +587,13 @@ static int jtag3_edbg_signoff(PROGRAMMER * pgm)
   buf[0] = CMSISDAP_CMD_LED;
   buf[1] = CMSISDAP_LED_CONNECT;
   buf[2] = 0;
-  if (serial_send(&pgm->fd, buf, USBDEV_MAX_XFER_3) != 0) {
+  if (serial_send(&pgm->fd, buf, pgm->fd.usb.max_xfer) != 0) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_signoff(): failed to send command to serial port\n",
                     progname);
     return -1;
   }
-  rv = serial_recv(&pgm->fd, status, USBDEV_MAX_XFER_3);
+  rv = serial_recv(&pgm->fd, status, pgm->fd.usb.max_xfer);
-  if (rv != USBDEV_MAX_XFER_3) {
+  if (rv != pgm->fd.usb.max_xfer) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_signoff(): failed to read from serial port (%d)\n",
                     progname, rv);
     return -1;
@@ -577,13 +604,13 @@ static int jtag3_edbg_signoff(PROGRAMMER * pgm)
                     progname, status[0], status[1]);
 
   buf[0] = CMSISDAP_CMD_DISCONNECT;
-  if (serial_send(&pgm->fd, buf, USBDEV_MAX_XFER_3) != 0) {
+  if (serial_send(&pgm->fd, buf, pgm->fd.usb.max_xfer) != 0) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_signoff(): failed to send command to serial port\n",
                     progname);
     return -1;
   }
-  rv = serial_recv(&pgm->fd, status, USBDEV_MAX_XFER_3);
+  rv = serial_recv(&pgm->fd, status, pgm->fd.usb.max_xfer);
-  if (rv != USBDEV_MAX_XFER_3) {
+  if (rv != pgm->fd.usb.max_xfer) {
     avrdude_message(MSG_INFO, "%s: jtag3_edbg_signoff(): failed to read from serial port (%d)\n",
                     progname, rv);
     return -1;
@@ -644,8 +671,9 @@ static int jtag3_recv_frame(PROGRAMMER * pgm, unsigned char **msg) {
 }
 
 static int jtag3_edbg_recv_frame(PROGRAMMER * pgm, unsigned char **msg) {
-  int rv, len;
+  int rv, len = 0;
   unsigned char *buf = NULL;
+  unsigned char *request;
 
   avrdude_message(MSG_TRACE, "%s: jtag3_edbg_recv():\n", progname);
 
@@ -654,42 +682,92 @@ static int jtag3_edbg_recv_frame(PROGRAMMER * pgm, unsigned char **msg) {
 	    progname);
     return -1;
   }
-
+  if ((request = malloc(pgm->fd.usb.max_xfer)) == NULL) {
-  buf[0] = EDBG_VENDOR_AVR_RSP;
+    avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): out of memory\n",
-
-  if (serial_send(&pgm->fd, buf, USBDEV_MAX_XFER_3) != 0) {
-    avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): error sending CMSIS-DAP vendor command\n",
-                    progname);
-    return -1;
-  }
-
-  rv = serial_recv(&pgm->fd, buf, USBDEV_MAX_XFER_3);
-
-  if (rv < 0) {
-    /* timeout in receive */
-    avrdude_message(MSG_NOTICE2, "%s: jtag3_edbg_recv(): Timeout receiving packet\n",
 	    progname);
     free(buf);
     return -1;
   }
 
-  if (buf[0] != EDBG_VENDOR_AVR_RSP ||
-      buf[1] != ((1 << 4) | 1)) {
-    avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): Unexpected response 0x%02x, 0x%02x\n",
-                    progname, buf[0], buf[1]);
-    return -1;
-  }
-  /* calculate length from response; CMSIS-DAP response might be larger */
-  len = (buf[2] << 8) | buf[3];
-  if (len > rv + 4) {
-    avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): Unexpected length value (%d > %d)\n",
-                    progname, len, rv + 4);
-    len = rv + 4;
-  }
-  memmove(buf, buf + 4, len);
-
   *msg = buf;
 
+  int nfrags = 0;
+  int thisfrag = 0;
+
+  do {
+    request[0] = EDBG_VENDOR_AVR_RSP;
+
+    if (serial_send(&pgm->fd, request, pgm->fd.usb.max_xfer) != 0) {
+      avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): error sending CMSIS-DAP vendor command\n",
+                      progname);
+      free(request);
+      free(*msg);
+      return -1;
+    }
+
+    rv = serial_recv(&pgm->fd, buf, pgm->fd.usb.max_xfer);
+
+    if (rv < 0) {
+      /* timeout in receive */
+      avrdude_message(MSG_NOTICE2, "%s: jtag3_edbg_recv(): Timeout receiving packet\n",
+                      progname);
+      free(*msg);
+      free(request);
+      return -1;
+    }
+
+    if (buf[0] != EDBG_VENDOR_AVR_RSP) {
+      avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): Unexpected response 0x%02x\n",
+                      progname, buf[0]);
+      free(*msg);
+      free(request);
+      return -1;
+    }
+
+    /* calculate fragment information */
+    if (thisfrag == 0) {
+      /* first fragment */
+      nfrags = buf[1] & 0x0F;
+      thisfrag = 1;
+    } else {
+      if (nfrags != (buf[1] & 0x0F)) {
+        avrdude_message(MSG_INFO,
+                        "%s: jtag3_edbg_recv(): "
+                        "Inconsistent # of fragments; had %d, now %d\n",
+                        progname, nfrags, (buf[1] & 0x0F));
+        free(*msg);
+        free(request);
+        return -1;
+      }
+    }
+    if (thisfrag != ((buf[1] >> 4) & 0x0F)) {
+      avrdude_message(MSG_INFO,
+                      "%s: jtag3_edbg_recv(): "
+                      "Inconsistent fragment number; expect %d, got %d\n",
+                      progname, thisfrag, ((buf[1] >> 4) & 0x0F));
+      free(*msg);
+      free(request);
+      return -1;
+    }
+
+    int thislen = (buf[2] << 8) | buf[3];
+    if (thislen > rv + 4) {
+      avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): Unexpected length value (%d > %d)\n",
+                      progname, thislen, rv + 4);
+      thislen = rv + 4;
+    }
+    if (len + thislen > USBDEV_MAX_XFER_3) {
+      avrdude_message(MSG_INFO, "%s: jtag3_edbg_recv(): Length exceeds max size (%d > %d)\n",
+                      progname, len + thislen, USBDEV_MAX_XFER_3);
+      thislen = USBDEV_MAX_XFER_3 - len;
+    }
+    memmove(buf, buf + 4, thislen);
+    thisfrag++;
+    len += thislen;
+    buf += thislen;
+  } while (thisfrag <= nfrags);
+
+  free(request);
   return len;
 }
 

usb_libusb.c

@@ -166,6 +166,13 @@ static int usbdev_open(char * port, union pinfo pinfo, union filedescriptor *fd)
 		      fd->usb.eep = 0;
 		  }
 
+		  if(strstr(product, "mEDBG") != NULL)
+		  {
+		      /* The AVR Xplained Mini uses different endpoints. */
+		      fd->usb.rep = 0x81;
+		      fd->usb.wep = 0x02;
+		  }
+
                   avrdude_message(MSG_NOTICE, "%s: usbdev_open(): Found %s, serno: %s\n",
                                     progname, product, string);
 		  if (serno != NULL)
@@ -353,7 +360,7 @@ static int usbdev_send(union filedescriptor *fd, const unsigned char *bp, size_t
     }
     bp += tx_size;
     mlen -= tx_size;
-  } while (tx_size == fd->usb.max_xfer);
+  } while (mlen > 0);
 
   if (verbose > 3)
   {