refactor: move a private inline static function to .c file

Author: baptleduc

drivers/ads1115/ads1115.c

@@ -33,6 +33,22 @@
 
 #define ADS1115_CONF_TEST_VALUE (1)
 
+static inline int _ads1115_get_pga_voltage(ads1115_pga_t pga)
+{
+    switch (pga) {
+    case ADS1115_PGA_6_144V: return 6144;
+    case ADS1115_PGA_4_096V: return 4096;
+    case ADS1115_PGA_2_048V: return 2048;
+    case ADS1115_PGA_1_024V: return 1024;
+    case ADS1115_PGA_0_512V: return 512;
+    case ADS1115_PGA_0_256V:
+    case ADS1115_PGA_0_256V_B:
+    case ADS1115_PGA_0_256V_C:
+        return 256;
+    default:
+        return 0;
+    }
+}
 
 /**
  * @brief Builds the configuration register value from the parameters

drivers/include/ads1115.h

@@ -198,22 +198,6 @@ int ads1115_set_ain_ch_input(ads1115_t *dev, ads1115_mux_t mux);
  */
 int ads1115_read_conversion(ads1115_t *dev, uint16_t *value);
 
-static inline int _ads1115_get_pga_voltage(ads1115_pga_t pga)
-{
-    switch (pga) {
-    case ADS1115_PGA_6_144V: return 6144;
-    case ADS1115_PGA_4_096V: return 4096;
-    case ADS1115_PGA_2_048V: return 2048;
-    case ADS1115_PGA_1_024V: return 1024;
-    case ADS1115_PGA_0_512V: return 512;
-    case ADS1115_PGA_0_256V:
-    case ADS1115_PGA_0_256V_B:
-    case ADS1115_PGA_0_256V_C:
-        return 256;
-    default:
-        return 0;
-    }
-}
 
 /**
  * @brief Converts the digital value from the ADS1115 device to millivolts.