summaryrefslogtreecommitdiffstats
path: root/keyboards/crkbd/rev1/common/ssd1306.c
blob: 4a889da6738f945c7eb3a05b3a706f8e43960b2d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
#ifdef SSD1306OLED

#include "ssd1306.h"
#include "i2c_master.h"
#include <string.h>
#include "print.h"
#ifdef ADAFRUIT_BLE_ENABLE
#include "adafruit_ble.h"
#endif
#ifdef PROTOCOL_LUFA
#include "lufa.h"
#endif
#include "sendchar.h"
#include "timer.h"

struct CharacterMatrix display;

extern const unsigned char font[] PROGMEM;

#ifndef OLED_BLANK_CHAR
#define OLED_BLANK_CHAR ' '
#endif

#ifndef OLED_BITS_FILTER
#define OLED_BITS_FILTER
#endif

// Set this to 1 to help diagnose early startup problems
// when testing power-on with ble.  Turn it off otherwise,
// as the latency of printing most of the debug info messes
// with the matrix scan, causing keys to drop.
#define DEBUG_TO_SCREEN 0

//static uint16_t last_battery_update;
//static uint32_t vbat;
//#define BatteryUpdateInterval 10000 /* milliseconds */

// 'last_flush' is declared as uint16_t,
// so this must be less than 65535
#ifndef ScreenOffInterval
#define ScreenOffInterval 60000 /* milliseconds */
#endif

#if DEBUG_TO_SCREEN
static uint8_t displaying;
#endif
static uint16_t last_flush;

static bool force_dirty = true;

// Write command sequence.
// Returns true on success.
static inline bool _send_cmd1(uint8_t cmd) {
  bool res = false;

  if (i2c_start(SSD1306_ADDRESS, 100)) {
    xprintf("failed to start write to %d\n", SSD1306_ADDRESS);
    goto done;
  }

  if (i2c_write(0x0 /* command byte follows */, 100)) {
    print("failed to write control byte\n");

    goto done;
  }

  if (i2c_write(cmd, 100)) {
    xprintf("failed to write command %d\n", cmd);
    goto done;
  }
  res = true;
done:
  i2c_stop();
  return res;
}

#define send_cmd1(c) if (!_send_cmd1(c)) {goto done;}
#define send_cmds(c) if (!_send_cmds(c,sizeof(c))) {goto done;}
#define cmd1(X) X
#define cmd2(X,Y) X,Y
#define cmd3(X,Y,Z) X,Y,Z

static bool _send_cmds(const uint8_t* p,uint8_t sz) {
  for(uint8_t i=sz;i;i--) {
    send_cmd1( pgm_read_byte(p++) );
  }
  return true;
done:
  return false;
}

#define SEND_CMDS(...) {static const uint8_t _cmds[] PROGMEM = { __VA_ARGS__,0 };send_cmds(_cmds);}

static void clear_display(void) {
  matrix_clear(&display);

  // Clear all of the display bits (there can be random noise
  // in the RAM on startup)
  SEND_CMDS(
    cmd3(PageAddr, 0, (DisplayHeight / 8) - 1),
    cmd3(ColumnAddr, 0, DisplayWidth - 1)
  );

  if (i2c_start(SSD1306_ADDRESS, 100)) {
    goto done;
  }
  if (i2c_write(0x40, 100)) {
    // Data mode
    goto done;
  }
  for (uint8_t row = MatrixRows;row; row--) {
    for (uint8_t col = DisplayWidth; col; col--) {
      i2c_write(0, 100);
    }
  }

  display.dirty = false;

done:
  i2c_stop();
}

#if DEBUG_TO_SCREEN
#undef sendchar
static int8_t capture_sendchar(uint8_t c) {
  sendchar(c);
  iota_gfx_write_char(c);

  if (!displaying) {
    iota_gfx_flush();
  }
  return 0;
}
#endif

bool iota_gfx_init(bool rotate) {
  bool success = false;

  i2c_init();
  SEND_CMDS(
    cmd1(DisplayOff),
    cmd2(SetDisplayClockDiv, 0x80),
    cmd2(SetMultiPlex, DisplayHeight - 1),
    cmd2(SetDisplayOffset, 0),
    cmd1(SetStartLine | 0x0),
    cmd2(SetChargePump, 0x14 /* Enable */),
    cmd2(SetMemoryMode, 0 /* horizontal addressing */)
  );

  if(rotate){
    // the following Flip the display orientation 180 degrees
  SEND_CMDS(
    cmd1(SegRemap),
    cmd1(ComScanInc)
  );
  }else{
    // Flips the display orientation 0 degrees
  SEND_CMDS(
      cmd1(SegRemap | 0x1),
      cmd1(ComScanDec)
    );
  }

  SEND_CMDS(
#ifdef SSD1306_128X64
	cmd2(SetComPins, 0x12),
#else
	cmd2(SetComPins, 0x2),
#endif
    cmd2(SetContrast, 0x8f),
    cmd2(SetPreCharge, 0xf1),
    cmd2(SetVComDetect, 0x40),
    cmd1(DisplayAllOnResume),
    cmd1(NormalDisplay),
    cmd1(DeActivateScroll),
    cmd1(DisplayOn),

    cmd2(SetContrast, 0) // Dim
  );

  clear_display();

  success = true;

  iota_gfx_flush();

#if DEBUG_TO_SCREEN
  print_set_sendchar(capture_sendchar);
#endif

done:
  return success;
}

bool iota_gfx_off(void) {
  bool success = false;

  send_cmd1(DisplayOff);
  success = true;

done:
  return success;
}

bool iota_gfx_on(void) {
  bool success = false;

  send_cmd1(DisplayOn);
  success = true;

done:
  return success;
}

void matrix_write_char_inner(struct CharacterMatrix *matrix, uint8_t c) {
  *matrix->cursor = c;
  ++matrix->cursor;

  if (matrix->cursor - &matrix->display[0][0] == sizeof(matrix->display)) {
    // We went off the end; scroll the display upwards by one line
    memmove(&matrix->display[0], &matrix->display[1],
            MatrixCols * (MatrixRows - 1));
    matrix->cursor = &matrix->display[MatrixRows - 1][0];
    memset(matrix->cursor, OLED_BLANK_CHAR, MatrixCols);
  }
}

void matrix_write_char(struct CharacterMatrix *matrix, uint8_t c) {
  matrix->dirty = true;

  if (c == '\n') {
    // Clear to end of line from the cursor and then move to the
    // start of the next line
    uint8_t cursor_col = (matrix->cursor - &matrix->display[0][0]) % MatrixCols;

    while (cursor_col++ < MatrixCols) {
      matrix_write_char_inner(matrix, OLED_BLANK_CHAR);
    }
    return;
  }

  matrix_write_char_inner(matrix, c);
}

void iota_gfx_write_char(uint8_t c) {
  matrix_write_char(&display, c);
}

void matrix_write(struct CharacterMatrix *matrix, const char *data) {
  while (*data) {
    matrix_write_char(matrix, *data);
    ++data;
  }
}

void matrix_write_ln(struct CharacterMatrix *matrix, const char *data) {
  matrix_write(matrix, data);
  matrix_write(matrix, "\n");
}

void iota_gfx_write(const char *data) {
  matrix_write(&display, data);
}

void matrix_write_P(struct CharacterMatrix *matrix, const char *data) {
  while (true) {
    uint8_t c = pgm_read_byte(data);
    if (c == 0) {
      return;
    }
    matrix_write_char(matrix, c);
    ++data;
  }
}

void iota_gfx_write_P(const char *data) {
  matrix_write_P(&display, data);
}

void matrix_clear(struct CharacterMatrix *matrix) {
  memset(matrix->display, OLED_BLANK_CHAR, sizeof(matrix->display));
  matrix->cursor = &matrix->display[0][0];
  matrix->dirty = true;
}

void iota_gfx_clear_screen(void) {
  matrix_clear(&display);
}

void matrix_render(struct CharacterMatrix *matrix) {
  last_flush = timer_read();
  iota_gfx_on();
#if DEBUG_TO_SCREEN
  ++displaying;
#endif

  // Move to the home position
  SEND_CMDS(
    cmd3(PageAddr, 0, MatrixRows - 1),
    cmd3(ColumnAddr, 0, (MatrixCols * FontWidth) - 1)
  );

  if (i2c_write(SSD1306_ADDRESS, 100)) {
    goto done;
  }
  if (i2c_write(0x40, 100)) {
    // Data mode
    goto done;
  }

  for (uint8_t row = 0; row < MatrixRows; ++row) {
    for (uint8_t col = 0; col < MatrixCols; ++col) {
      const uint8_t *glyph = font + (matrix->display[row][col] * FontWidth);

      for (uint8_t glyphCol = 0; glyphCol < FontWidth; ++glyphCol) {
        uint8_t colBits = pgm_read_byte(glyph + glyphCol);
        i2c_write(colBits OLED_BITS_FILTER, 100);
      }

      // 1 column of space between chars (it's not included in the glyph)
      //i2c_master_write(0);
    }
  }

  matrix->dirty = false;

done:
  i2c_stop();
#if DEBUG_TO_SCREEN
  --displaying;
#endif
}

void iota_gfx_flush(void) {
  matrix_render(&display);
}

__attribute__ ((weak))
void iota_gfx_task_user(void) {
}

void iota_gfx_task(void) {
  iota_gfx_task_user();

  if (display.dirty|| force_dirty) {
    iota_gfx_flush();
    force_dirty = false;
  }

  if (ScreenOffInterval !=0 && timer_elapsed(last_flush) > ScreenOffInterval) {
    iota_gfx_off();
  }
}

bool process_record_gfx(uint16_t keycode, keyrecord_t *record) {
  force_dirty = true;
  return true;
}

#endif