Add screen option to syscfg

apps/ble-demo/src/main.c

@@ -166,6 +166,7 @@ int main( void ) {
 
 static void screen_init( void ) {
 
+#if MYNEWT_VAL( SCREEN )
 	hal_i2c_enable( 0 );
 
 	static const uint8_t init[] = {
@@ -198,21 +199,29 @@ static void screen_init( void ) {
 	text16( "Hi!!! :)", frame, 0, 0 );
 
 	i2c_write( frame_buffer, sizeof frame_buffer );
+#endif
 
 }
 
 static void i2c_write( const uint8_t* d, size_t s ) {
 
+#if MYNEWT_VAL( SCREEN )
 	while ( 0 != hal_i2c_master_write( 0,
 		&( (struct hal_i2c_master_data) {
 			.address = 0x78 >> 1,
 			.len = s,
 			.buffer = (void*) d,
 		} ), 2 * s, 1 ) );
+#else
+	(void) d;
+	(void) s;
+#endif
+
 }
 
 static int text8( const char* text, uint8_t* frame, int line, int x ) {
 
+#if MYNEWT_VAL( SCREEN )
 	uint8_t* write_pos = frame + ( line * 128 ) + x;
 
 	int i = 0;
@@ -243,11 +252,18 @@ static int text8( const char* text, uint8_t* frame, int line, int x ) {
 	}
 
 	return i;
+#else
+	(void) frame;
+	(void) line;
+	(void) x;
+	return strlen( text );
+#endif
 
 };
 
 static int text16( const char* text, uint8_t* frame, int line, int x ) {
 
+#if MYNEWT_VAL( SCREEN )
 	uint8_t* write_pos = frame + ( line * 128 ) + x;
 
 	int i = 0;
@@ -279,6 +295,12 @@ static int text16( const char* text, uint8_t* frame, int line, int x ) {
 	}
 
 	return i;
+#else
+	(void) frame;
+	(void) line;
+	(void) x;
+	return strlen( text );
+#endif
 
 };
 

apps/ble-demo/syscfg.yml

@@ -11,6 +11,9 @@ syscfg.defs:
     CPUTIME_FREQ:
         description: "Frequency for the cputime counter"
         value: '50000'
+    SCREEN:
+        description: "Is there a screen there"
+        value: '0'
 
 syscfg.vals:
     BLE_ROLE_BROADCASTER: 1