More refactoring

- Display is a separated entity
- Make battery configuration consistent with others
- Led config part of led.c
- Jack config moved to monitor.c

components/display/display.h

@@ -0,0 +1,70 @@
+/* 
+ *  (c) Philippe G. 2019, philippe_44@outlook.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#pragma once
+
+/* 
+ The displayer is not thread-safe and the caller must ensure use its own 
+ mutexes if it wants something better. Especially, text() line() and draw()
+ are not protected against each other.
+ In text mode (text/line) when using DISPLAY_SUSPEND, the displayer will 
+ refreshed line 2 one last time before suspending itself. As a result if it
+ is in a long sleep (scrolling pause), the refresh will happen after wakeup. 
+ So it can conflict with other display direct writes that have been made during
+ sleep. Note that if DISPLAY_SHUTDOWN has been called meanwhile, it (almost) 
+ never happens
+*/ 
+  
+#define DISPLAY_CLEAR 		0x01
+#define	DISPLAY_ONLY_EOL	0x02
+#define DISPLAY_UPDATE		0x04
+#define DISPLAY_MONOSPACE	0x08
+
+// these ones are for 'x' parameter of line() function
+#define DISPLAY_LEFT 	0
+#define DISPLAY_RIGHT	0xff00
+#define	DISPLAY_CENTER  0xff01
+
+enum display_pos_e 	{ DISPLAY_TOP_LEFT, DISPLAY_MIDDLE_LEFT, DISPLAY_BOTTOM_LEFT, DISPLAY_CENTERED };
+enum display_font_e { DISPLAY_FONT_DEFAULT, 
+					  DISPLAY_FONT_LINE_1, DISPLAY_FONT_LINE_2, DISPLAY_FONT_SEGMENT, 
+					  DISPLAY_FONT_TINY, DISPLAY_FONT_SMALL,  DISPLAY_FONT_MEDIUM, DISPLAY_FONT_LARGE, DISPLAY_FONT_HUGE };
+					  
+enum displayer_cmd_e 	{ DISPLAYER_SHUTDOWN, DISPLAYER_ACTIVATE, DISPLAYER_SUSPEND, DISPLAYER_TIMER_PAUSE, DISPLAYER_TIMER_RUN };
+enum displayer_time_e 	{ DISPLAYER_ELAPSED, DISPLAYER_REMAINING };
+
+// don't change anything there w/o changing all drivers init code
+extern struct display_s {
+	int width, height;
+	bool (*init)(char *config, char *welcome);
+	void (*clear)(void);
+	bool (*set_font)(int num, enum display_font_e font, int space);
+	void (*on)(bool state);
+	void (*brightness)(uint8_t level);
+	void (*text)(enum display_font_e font, enum display_pos_e pos, int attribute, char *msg, ...);
+	bool (*line)(int num, int x, int attribute, char *text);
+	int (*stretch)(int num, char *string, int max);
+	void (*update)(void);
+	void (*draw)(int x1, int y1, int x2, int y2, bool by_column, uint8_t *data);
+	void (*draw_cbr)(uint8_t *data, int height);		// height is the # of columns in data, as oppoosed to display height (0 = display height) 
+} *display;
+
+void displayer_scroll(char *string, int speed);
+void displayer_control(enum displayer_cmd_e cmd, ...);
+void displayer_metadata(char *artist, char *album, char *title);
+void displayer_timer(enum displayer_time_e mode, int elapsed, int duration);