diff --git a/src/radioPinFunctions.c b/src/radioPinFunctions.c
index df8170f..43ca62b 100644
--- a/src/radioPinFunctions.c
+++ b/src/radioPinFunctions.c
@@ -12,54 +12,63 @@
 #include <avr/io.h>
 #include "common.h"
 
+#define REG         DDRB
+#define PORT        PORTB
+#define PIN         PINB
+#define PIN_CE      PB0
+#define PIN_CSN     PB1
+#define PIN_SCK     PB5
+#define PIN_MOSI    PB3
+#define PIN_MISO    PB4
+
 /* ------------------------------------------------------------------------- */
-void nrf24_setupPins()
+void nrf24_setupPins(void)
 {
-    SET(DDRC, 0); // CE output
-    SET(DDRC, 1); // CSN output
-    SET(DDRC, 2); // SCK output
-    SET(DDRC, 3); // MOSI output
-    CLR(DDRC, 4); // MISO input
+    SET(REG, PIN_CE);
+    SET(REG, PIN_CSN);
+    SET(REG, PIN_SCK);
+    SET(REG, PIN_MOSI);
+    CLR(REG, PIN_MISO);
 }
 /* ------------------------------------------------------------------------- */
 void nrf24_ce_digitalWrite(uint8_t state)
 {
     if (state) {
-        SET(PORTC, 0);
+        SET(PORT, PIN_CE);
     } else {
-        CLR(PORTC, 0);
+        CLR(PORT, PIN_CE);
     }
 }
 /* ------------------------------------------------------------------------- */
 void nrf24_csn_digitalWrite(uint8_t state)
 {
     if (state) {
-        SET(PORTC, 1);
+        SET(PORT, PIN_CSN);
     } else {
-        CLR(PORTC, 1);
+        CLR(PORT, PIN_CSN);
     }
 }
 /* ------------------------------------------------------------------------- */
 void nrf24_sck_digitalWrite(uint8_t state)
 {
     if (state) {
-        SET(PORTC, 2);
+        SET(PORT, PIN_SCK);
     } else {
-        CLR(PORTC, 2);
+        CLR(PORT, PIN_SCK);
     }
 }
 /* ------------------------------------------------------------------------- */
 void nrf24_mosi_digitalWrite(uint8_t state)
 {
     if (state) {
-        SET(PORTC, 3);
+        SET(PORT, PIN_MOSI);
     } else {
-        CLR(PORTC, 3);
+        CLR(PORT, PIN_MOSI);
     }
 }
 /* ------------------------------------------------------------------------- */
-uint8_t nrf24_miso_digitalRead()
+uint8_t nrf24_miso_digitalRead(void)
 {
-    return CHK(PINC, 4);
+    return CHK(PIN, PIN_MISO);
 }
 /* ------------------------------------------------------------------------- */