4 files changed, 4 insertions, 11 deletions
diff --git a/src/main.c b/src/main.c
index c6a2a96..c01cb90 100644
--- a/src/main.c
+++ b/src/main.c
@@ -78,7 +78,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int eusart_write_midi(midi_message_t *pkt)
+int eusart_write_midi(const midi_message_t *pkt)
 {
     size_t length;
     uint8_t *data;
diff --git a/src/midi.c b/src/midi.c
index e82c921..b81cf2d 100644
--- a/src/midi.c
+++ b/src/midi.c
@@ -14,17 +14,15 @@ midi_message_t *midi_alloc_message(size_t data_size)
 
 void midi_free_message(midi_message_t *pkt)
 {
-#ifndef MIDI_UNSAFE
     if (pkt == NULL) {
         return;
     }
-#endif
     
     free(pkt);
     pkt = NULL;
 }
 
-size_t midi_message_size(midi_message_t *pkt)
+size_t midi_message_size(const midi_message_t *pkt)
 {
     if (pkt == NULL) {
         return 0;   
diff --git a/src/midi.h b/src/midi.h
index cab35e3..fb85833 100644
--- a/src/midi.h
+++ b/src/midi.h
@@ -59,14 +59,13 @@ typedef struct {
 
 // allocation / dellocation 
 extern midi_message_t *midi_alloc_message(size_t data_size);
-extern void midi_free_message(midi_message_t *pkt);
-extern size_t midi_message_size(midi_message_t *pkt);
+extern void midi_free_message(const midi_message_t *pkt);
+extern size_t midi_message_size(const midi_message_t *pkt);
 
 #endif
 
 
 // helper functions
-
 extern int midi_set_status(midi_message_t *pkt, midi_status_t status);
 extern int midi_set_channel(midi_message_t *pkt, unsigned channel);
 
@@ -77,6 +76,5 @@ extern int midi_note_off(midi_message_t *pkt, unsigned channel, midi_note_t note
 // optimization
 // extern int midi_thin_data(void *buffer, midi_message_t pkt[]);
 
-
 #endif	/* MIDI_H */
 
diff --git a/src/rs232.c b/src/rs232.c
index 05d8b22..e87e49b 100644
--- a/src/rs232.c
+++ b/src/rs232.c
@@ -3,7 +3,6 @@
 
 void eusart_init(void)
 {
-    
     // set Async and 8 bits frame
     TXSTAbits.SYNC = 0;
     TXSTAbits.TX9 = 0;
@@ -23,14 +22,12 @@ void eusart_init(void)
 
 void putch(char c)
 {
-    
     while (!TXIF);
     TXREG = c;
 }
 
 char getch(void)
 {
-    
     while (!RCIF);
     return RCREG;
 }