Update SoftI2CMaster.h

SpenceKonde · Aug 20, 2023 · d2b355b · d2b355b
1 parent 8a5472b
commit d2b355b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/avr/libraries/Wire/src/SoftI2CMaster.h b/avr/libraries/Wire/src/SoftI2CMaster.h
@@ -199,14 +199,15 @@ void  i2c_delay_half(void)
   __asm__ __volatile__ (" ret");
   // 7 cycles for call and return
 #else
+  uint8_t temp = 0;
   __asm__ __volatile__
     (
      " ldi      r25, %[DELAY]           ; load delay constant   ; 4C \n\t"
      "_Lidelay: \n\t"
      " dec r25                          ; decrement counter     ; 4C + xC \n\t"
      " brne _Lidelay                                           ; 5C+(x-1)2C + xC\n\t"
      " ret                                                     ; 9C+(x-1)2C + xC = 7C + xC"
-     : : [DELAY] "M" I2C_DELAY_COUNTER : "r25");
+     :'+d' ((uint8_t) temp) : [DELAY] "M" I2C_DELAY_COUNTER);
   // 7 cycles + 3 times x cycles
 #endif
 }