avr: cleanup, added labels to calculate module sizes.

avr/com_buffer.asm

@@ -15,6 +15,35 @@
 
 .cseg
 
+COM_BUFFER_BEGIN:
+
+
+; ---------------------------------------------------------------------------
+; COM_AllocBufferAndGetXY
+;
+; IN:
+; - nothing
+; OUT:
+; - CFLAG: set if okay, clear otherwise
+; - Y: pointer to buffer
+; - X: pointer to data portion of the buffer
+; MODIFIED REGS: R16, R17 (R21)
+
+COM_AllocBufferAndGetXY:
+  rcall COM_BufferAlloc              ; (r16, r17, r21)
+  brcc COM_AllocBufferAndGetXY_error
+  mov xl, yl
+  mov xh, yh
+  adiw xh:xl, COM_BUFFER_OFFS_DATA
+  sec
+  ret
+COM_AllocBufferAndGetXY_error:
+  ldi xl, LOW(comStatsSendNoBuffer)
+  ldi xh, HIGH(comStatsSendNoBuffer)
+  clc
+  ret
+
+
 
 ; ---------------------------------------------------------------------------
 ; COM_BufferAlloc
@@ -170,5 +199,8 @@ COM_BufferPosToY:
   ret
 
 
+COM_BUFFER_END:
+.equ MODULE_SIZE_COM_BUFFER = COM_BUFFER_END-COM_BUFFER_BEGIN
+