diff --git a/Firmware/Chameleon-Mini/ISRSharing.S b/Firmware/Chameleon-Mini/ISRSharing.S
index 1496cea..9a18a82 100644
--- a/Firmware/Chameleon-Mini/ISRSharing.S
+++ b/Firmware/Chameleon-Mini/ISRSharing.S
@@ -9,26 +9,24 @@
 #include "Codec/Codec.h"
 #include <avr/interrupt.h>
 
+; Use this macro to call isr functions
+.macro call_isr isr_address
+push r30
+push r31
+lds r30, \isr_address
+lds r31, \isr_address+1
+icall
+pop r31
+pop r30
+reti
+.endm
+
 ; Find first pause and start sampling
 .global CODEC_DEMOD_IN_INT0_VECT
 CODEC_DEMOD_IN_INT0_VECT:
-    push   r30
-    push   r31
-    lds    r30, isr_func_CODEC_DEMOD_IN_INT0_VECT
-    lds    r31, isr_func_CODEC_DEMOD_IN_INT0_VECT + 1
-    icall
-    pop    r31
-    pop    r30
-    reti
+    call_isr isr_func_CODEC_DEMOD_IN_INT0_VECT
 
 ; Frame Delay Time PCD to PICC ends
 .global CODEC_TIMER_SAMPLING_CCC_VECT
 CODEC_TIMER_SAMPLING_CCC_VECT:
-    push   r30
-    push   r31
-    lds    r30, isr_func_TCD0_CCC_vect
-    lds    r31, isr_func_TCD0_CCC_vect + 1
-    icall
-    pop    r31
-    pop    r30
-    reti
+    call_isr isr_func_TCD0_CCC_vect