1
/* -*- mode: c++; compile-command: "BOARD=pro5v make"; -*- */
5
* Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.
7
* This file is part of propeller-clock (hereafter referred to as "this
8
* program"). See http://ed.am/dev/software/arduino/propeller-clock for more
11
* This program is free software: you can redistribute it and/or modify
12
* it under the terms of the GNU Lesser General Public License as published
13
* by the Free Software Foundation, either version 3 of the License, or
14
* (at your option) any later version.
16
* This program is distributed in the hope that it will be useful,
17
* but WITHOUT ANY WARRANTY; without even the implied warranty of
18
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19
* GNU Lesser General Public License for more details.
21
* You should have received a copy of the GNU Lesser General Public License
22
* along with this program. If not, see <http://www.gnu.org/licenses/>.
25
/******************************************************************************
29
* a PC fan is wired up to a 12V power supply
31
* the fan's SENSE (tachometer) pin connected to pin 2 on the
34
* the pins 4 to 13 on the Arduino should directly drive an LED (the
35
LED on pin 4 is in the centre of the clock face and the LED on pin
38
* if a longer hand (and a larger clock face) is desired, pin 4 can be
39
used to indirectly drive a transistor which in turn drives several
40
LEDs that turn on and off in unison in the centre of the clock.
42
* a button should be attached to pin 3 that grounds it when pressed.
44
* A DS1307 remote clock is connected via I2C on analogue pins 4 and 5.
46
Implementation details:
48
* for a schematic, see ../project/propeller-clock.sch.
50
* the timing of the drawing of the clock face is recalculated with
51
every rotation of the propeller.
53
* a PC fan actually sends 2 tachometer pulses per revolution, so the
54
software skips every other one. This means that the clock may
55
appear upside-down if started with the propeller in the wrong
56
position. You will need to experiment to discover the position that
57
the propeller must be in when starting the clock.
61
* pressing the button cycles between variations of the current
64
* pressing and holding the button for a second cycles between display
65
modes (e.g., analogue and digital).
67
* pressing and holding the button for 5 seconds enters "time set"
68
mode. In this mode, the following applies:
69
- the field that is being set flashes
70
- pressing the button increments the field currently being set
71
- pressing and holding the button for a second cycles through the
72
fields that can be set
73
- pressing and holding the button for 5 seconds sets the time and
76
******************************************************************************/
82
#include "analogue_clock.h"
83
#include "digital_clock.h"
84
#include "test_pattern.h"
85
#include "settings_mode.h"
87
#include "text_renderer.h"
90
//_____________________________________________________________________________
93
// when non-zero, the time (in microseconds) of a new fan pulse that
94
// has just occurred, which means that segment drawing needs to be
96
static unsigned long _new_pulse_at = 0;
98
// the time (in microseconds) when the last fan pulse occurred
99
static unsigned long _last_pulse_at = 0;
101
// duration (in microseconds) that a segment should be displayed
102
static unsigned long _segment_step = 0;
104
// remainder after divisor and a tally of the remainders for each segment
105
static unsigned long _segment_step_sub_step = 0;
106
static unsigned long _segment_step_sub = 0;
109
static Button _button( 3 );
112
static int _major_mode = 0;
113
static int _minor_mode = 0;
115
#define MAIN_MODE_IDX 1
116
#define SETTINGS_MODE_IDX 0
118
#define ANALOGUE_CLOCK_IDX 0
119
#define DIGITAL_CLOCK_IDX 1
120
#define TEST_PATTERN_IDX 2
122
//_____________________________________________________________________________
126
// activate the current minor mode
127
void activate_minor_mode()
133
// give the mode a chance to init
134
switch( _minor_mode ) {
135
case ANALOGUE_CLOCK_IDX: analogue_clock_activate(); break;
136
case DIGITAL_CLOCK_IDX: digital_clock_activate(); break;
141
// activate major mode
142
void activate_major_mode()
149
_button.set_press_mode( _major_mode != SETTINGS_MODE_IDX );
151
// give the mode a chance to init
152
switch( _major_mode ) {
153
case MAIN_MODE_IDX: activate_minor_mode(); break;
154
case SETTINGS_MODE_IDX: settings_mode_activate(); break;
159
// perform button events
160
void do_button_events()
162
// loop through pending events
163
while( int event = _button.get_event() )
169
switch( _major_mode ) {
171
switch( _minor_mode ) {
172
case ANALOGUE_CLOCK_IDX: analogue_clock_press(); break;
173
case DIGITAL_CLOCK_IDX: digital_clock_press(); break;
176
case SETTINGS_MODE_IDX: settings_mode_press(); break;
182
switch( _major_mode ) {
184
if( ++_minor_mode >= 3 )
186
activate_minor_mode();
188
case SETTINGS_MODE_IDX: settings_mode_long_press(); break;
193
// looooong press (change major mode)
194
if( ++_major_mode > 1 )
196
activate_major_mode();
203
// draw a display segment
204
void draw_next_segment( bool reset )
206
// keep track of segment
208
static int segment = ( NUM_SEGMENTS - CLOCK_SHIFT ) % NUM_SEGMENTS;
209
if( reset ) segment = ( NUM_SEGMENTS - CLOCK_SHIFT ) % NUM_SEGMENTS;
211
static int segment = NUM_SEGMENTS - 1 - CLOCK_SHIFT;
212
if( reset ) segment = NUM_SEGMENTS - 1 - CLOCK_SHIFT;
215
// reset the text renderer
216
TextRenderer::reset_buffer();
220
switch( _major_mode ) {
222
switch( _minor_mode ) {
223
case ANALOGUE_CLOCK_IDX: analogue_clock_draw_reset(); break;
224
case DIGITAL_CLOCK_IDX: digital_clock_draw_reset(); break;
227
case SETTINGS_MODE_IDX: settings_mode_draw_reset(); break;
230
// tell the text services we're starting a new frame
235
switch( _major_mode ) {
237
switch( _minor_mode ) {
238
case ANALOGUE_CLOCK_IDX: analogue_clock_draw( segment ); break;
239
case DIGITAL_CLOCK_IDX: digital_clock_draw( segment ); break;
240
case TEST_PATTERN_IDX: test_pattern_draw( segment ); break;
243
case SETTINGS_MODE_IDX: settings_mode_draw( segment ); break;
246
// draw any text that was rendered
247
TextRenderer::output_buffer();
250
if( ++segment >= NUM_SEGMENTS ) segment = 0;
252
if( --segment < 0 ) segment = NUM_SEGMENTS - 1;
257
// calculate time constants when a new pulse has occurred
258
void calculate_segment_times()
260
// check for overflows, and only recalculate times if there isn't
261
// one (if there is, we'll just go with the last pulse's times)
262
if( _new_pulse_at > _last_pulse_at )
264
// new segment stepping times
265
unsigned long delta = _new_pulse_at - _last_pulse_at;
266
_segment_step = delta / NUM_SEGMENTS;
267
_segment_step_sub = 0;
268
_segment_step_sub_step = delta % NUM_SEGMENTS;
271
// now we have dealt with this pulse, save the pulse time and
272
// clear new_pulse_at, ready for the next pulse
273
_last_pulse_at = _new_pulse_at;
278
// wait until it is time to draw the next segment or a new pulse has
280
void wait_till_end_of_segment( bool reset )
282
static unsigned long end_time = 0;
286
end_time = _last_pulse_at;
288
// work out the time that this segment should be displayed until
289
end_time += _segment_step;
290
_segment_step_sub += _segment_step_sub_step;
291
if( _segment_step_sub >= NUM_SEGMENTS ) {
292
_segment_step_sub -= NUM_SEGMENTS;
297
while( micros() < end_time && !_new_pulse_at );
301
// ISR to handle the pulses from the fan's tachiometer
302
void fan_pulse_handler()
304
// the fan actually sends two pulses per revolution. These pulses
305
// may not be exactly evenly distributed around the rotation, so
306
// we can't recalculate times on every pulse. Instead, we ignore
307
// every other pulse so timings are based on a complete rotation.
308
static bool ignore = true;
312
// set a new pulse time
313
_new_pulse_at = micros();
321
// set up an interrupt handler on pin 2 to nitice fan pulses
322
attachInterrupt( 0, fan_pulse_handler, RISING );
323
digitalWrite( 2, HIGH );
325
// set up output pins (4 to 13) for the led array
326
for( int a = 4; a < 14; a++ )
327
pinMode( a, OUTPUT );
329
// set up mode-switch button on pin 3
331
digitalWrite( 3, HIGH );
332
static int event_times[] = { 5, 500, 4000, 0 };
333
_button.set_event_times( event_times );
338
// init text renderer
339
TextRenderer::init();
341
// activate the minor mode
342
activate_major_mode();
349
// if there has been a new pulse, we'll be resetting the display
350
bool reset = _new_pulse_at? true : false;
355
// only do this stuff at the start of a display cycle, to ensure
356
// that no state changes mid-display
359
// calculate segment times
360
calculate_segment_times();
362
// keep track of time
365
// perform button events
370
draw_next_segment( reset );
372
// wait till it's time to draw the next segment
373
wait_till_end_of_segment( reset );