diff --git a/src/system/gpio.c b/src/system/gpio.c
--- a/src/system/gpio.c
+++ b/src/system/gpio.c
@@ -109,3 +109,21 @@ void user_input_signed(int32_t* to_modif
         }
     }
 }
+
+// Increment/decrement signed variable with up/down buttons
+void user_input_float(float* to_modify)
+{
+    //fixme: need to cast to 16/32 bits correctly
+    if(CHANGE_ELAPSED) {
+        if(!HAL_GPIO_ReadPin(SW_UP) ) {
+            CHANGE_RESET;
+            if (*to_modify < 32768)
+                (*to_modify)++;
+        }
+        else if(!HAL_GPIO_ReadPin(SW_DOWN)) {
+            CHANGE_RESET;
+            if (*to_modify >= -32768)
+                (*to_modify)--;
+        }
+    }
+}