avr: reorganized common code.

avr/common/eeprom-w.asm

@@ -101,6 +101,30 @@ Eeprom_WriteByteIfChanged_end:
 
 
 
+; ---------------------------------------------------------------------------
+; @routine Eeprom_WriteBytes @global
+;
+; Write bytes into EEPROM (if changed, thus saving on write cycles)
+;
+; @param X    eeprom address to write to
+; @param Y    address in SDRAM to read from
+; @param R17  number of bytes to copy
+; @clobbers r16, r17, r18, X, Y
+
+Eeprom_WriteBytes:
+  mov r18, r17
+Eeprom_WriteBytes_loop:
+    ld r16, Y+
+    rcall Eeprom_WriteByteIfChanged
+    brcc Eeprom_WriteBytes_ret
+    adiw xh:xl, 1
+    dec r18
+  brne Eeprom_WriteBytes_loop  
+Eeprom_WriteBytes_ret:
+  ret
+; @end
+
+
 
 
 #endif ; AQH_AVR_COMMON_EEPROM_W_H