9 files changed, 23 insertions, 16 deletions

diff --git a/Makefile b/Makefile
index 1c28676..335cc51 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 MCU = atmega88
-CFLAGS=-Os
+CFLAGS=-Os -Wall -Wextra
 
 all: sanduhr.hex
 
diff --git a/accel.c b/accel.c
index 2a73b40..3a6c595 100644
--- a/accel.c
+++ b/accel.c
@@ -180,15 +180,15 @@ bool accelProcess () {
 	return false;
 }
 
-const int8_t accelGetZ () {
+int8_t accelGetZ () {
 	return zval;
 }
 
-const uint8_t accelGetShakeCount () {
+uint8_t accelGetShakeCount () {
 	return shakeCount;
 }
 
-const horizon accelGetHorizon () {
+horizon accelGetHorizon () {
 	return horizonSign;
 }
 
diff --git a/accel.h b/accel.h
index 3aba602..4e53160 100644
--- a/accel.h
+++ b/accel.h
@@ -9,9 +9,9 @@ typedef enum {HORIZON_NONE, HORIZON_POS, HORIZON_NEG} horizon;
 void accelInit ();
 void accelStart ();
 bool accelProcess ();
-const int8_t accelGetZ ();
-const uint8_t accelGetShakeCount ();
-const horizon accelGetHorizon ();
+int8_t accelGetZ ();
+uint8_t accelGetShakeCount ();
+horizon accelGetHorizon ();
 
 #endif /* ACCEL_H */
 
diff --git a/common.h b/common.h
index eba8d6e..fed4dbd 100644
--- a/common.h
+++ b/common.h
@@ -9,5 +9,7 @@
 	while (cond) { sleep_cpu (); } \
 	sleep_disable ();
 
+#define __unused__ __attribute__ ((unused))
+
 #endif /* COMMON_H */
 
diff --git a/gyro.c b/gyro.c
index 0333e86..b9cba41 100644
--- a/gyro.c
+++ b/gyro.c
@@ -111,7 +111,7 @@ bool gyroProcess () {
 	return false;
 }
 
-const int32_t gyroGetZAccum () {
+int32_t gyroGetZAccum () {
 	return zaccum;
 }
 
@@ -119,11 +119,11 @@ void gyroResetZAccum () {
 	zaccum = 0;
 }
 
-volatile const int16_t gyroGetZRaw () {
+int16_t gyroGetZRaw () {
 	return zval;
 }
 
-const int8_t gyroGetZTicks () {
+int8_t gyroGetZTicks () {
 	return zticks;
 }
 
diff --git a/gyro.h b/gyro.h
index c55d8dd..9297a6f 100644
--- a/gyro.h
+++ b/gyro.h
@@ -8,9 +8,9 @@ void gyroInit ();
 void gyroStart ();
 bool gyroProcess ();
 void gyroResetAccum ();
-const int32_t gyroGetZAccum ();
-volatile const int16_t gyroGetZRaw ();
-const int8_t gyroGetZTicks ();
+int32_t gyroGetZAccum ();
+int16_t gyroGetZRaw ();
+int8_t gyroGetZTicks ();
 
 #endif /* GYROSCOPE_H */
 
diff --git a/i2c.c b/i2c.c
index 3e4bffb..84479a1 100644
--- a/i2c.c
+++ b/i2c.c
@@ -30,9 +30,12 @@ static void twFlushContRaw () {
 	TWCR = (TWCR & ~((1 << TWSTA) | (1 << TWSTO))) | (1 << TWIE) | (1 << TWINT) | (1 << TWEN) | (1 << TWEA);
 }
 
+#if 0
+/* unused */
 static void twWaitRaw () {
 	while (!(TWCR & (1 << TWINT)));
 }
+#endif
 
 static bool twWriteRaw (const uint8_t data) {
 	TWDR = data;
diff --git a/speaker.c b/speaker.c
index d903c57..2eace8d 100644
--- a/speaker.c
+++ b/speaker.c
@@ -37,7 +37,7 @@ void speakerStart () {
 	/* enable overflow interrupt */
 	TIMSK2 = (1 << TOIE2);
 	/* io clock with 1024 prescaler */
-	TCCR2B = (TCCR2B & ~((1 << CS21)) | (1 << CS22) | (1 << CS20));
+	TCCR2B = ((TCCR2B & ~(1 << CS21)) | (1 << CS22) | (1 << CS20));
 }
 
 void speakerStop () {
diff --git a/uart.c b/uart.c
index 3528a22..2eebe16 100644
--- a/uart.c
+++ b/uart.c
@@ -13,7 +13,7 @@ static void uartSend (unsigned char data) {
 	UDR0 = data;
 }
 
-static int uartPutc (char c, FILE *stream) {
+static int uartPutc (char c, FILE *stream __unused__) {
 	if (c == '\n') {
 		uartSend ('\r');	
 	}
@@ -48,10 +48,12 @@ void uartInit () {
 	stdout = &mystdout;
 }
 
+#if 0
+/* unused */
 static unsigned char uartReceive () {
 	/* Wait for data to be received */
 	while ( !(UCSR0A & (1<<RXC0)) );
 	/* Get and return received data from buffer */
 	return UDR0;
 }
-
+#endif