added comments, removed unused code.

avr/modules/com2w/com2w.asm

@@ -174,6 +174,7 @@ com2wReceiveNextPkg:
   ; msg received, alloc buffer for it
   rcall NET_Buffer_Alloc                          ; R16=buffer num (R16, R17, X)
   brcs com2wReceiveNextPkg_gotBuffer
+  ; out of memory
   ldi r16, NET_IFACE_OFFS_ERR_NOBUF_LOW
   rcall NET_Interface_IncCounter16                ; (R24, R25)
   rjmp com2wReceiveNextPkg_end
@@ -187,8 +188,8 @@ com2wReceiveNextPkg_gotBuffer:
     push zh
       mov zl, yl
       mov zh, yh
-      adiw zh:zl, COM2W_IFACE_OFFS_BUFFER
-      adiw xh:xl, 1
+      adiw zh:zl, COM2W_IFACE_OFFS_BUFFER    ; Z=SRC
+      adiw xh:xl, 1                          ; X=DEST
       ldd r18, Z+NETMSG_OFFS_MSGLEN
       inc r18
       inc r18
@@ -232,49 +233,6 @@ com2wReceiveNextPkg_end:
 
 
 
-#if 0
-; ---------------------------------------------------------------------------
-; @routine com2wReceiveAndCheckMsg
-;
-; Receive a packet into buffer pointed to by X.
-; Expects interrupts to be disabled.
-;
-; @param R18 COM address to listen to
-; @param R19 max buffer size
-; @param X   buffer to receive to
-; @return CFLAG set if msg received, cleared on error
-; @clobbers R16 (R17, R18, R19, R20, R22, R24, R25)
-
-com2wReceiveAndCheckMsg:
-  push xl
-    push xh
-      rcall com2wRecvMsg                     ; (r16, r17, r18, r19, r20, r22, r24, r25, X)
-    pop xh
-  pop xl
-  brcs com2wReceiveAndCheckMsg_recvd
-  ; fall-through, return with CF cleared (from com2wRecvMsg)
-  ret
-com2wReceiveAndCheckMsg_recvd:
-  push xl
-    push xh
-      rcall NETMSG_CheckMessageInBuffer      ; (R16, R17, R18, R19, R20, X)
-    pop xh
-  pop xl
-  brcs com2wReceiveAndCheckMsg_msgOk
-  ldi r16, NET_IFACE_OFFS_ERR_CONTENT_LOW
-  rcall NET_Interface_IncCounter16           ; (R24, R25)
-  clc
-  ret
-com2wReceiveAndCheckMsg_msgOk:
-  ldi r16, NET_IFACE_OFFS_PACKETSIN_LOW
-  rcall NET_Interface_IncCounter16           ; (R24, R25)
-  sec
-  ret
-; @end
-#endif
-
-
-
 ; ---------------------------------------------------------------------------
 ; @routine com2wSendNextPkg @global
 ;