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
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
|
/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.io/license.html
*/
#include "gfx.h"
#if GFX_USE_GDISP
#define GDISP_DRIVER_VMT GDISPVMT_ED060SC4
#include "gdisp_lld_config.h"
#include "../../../src/gdisp/gdisp_driver.h"
#include "board_ED060SC4.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#ifndef GDISP_SCREEN_HEIGHT
#define GDISP_SCREEN_HEIGHT 600
#endif
#ifndef GDISP_SCREEN_WIDTH
#define GDISP_SCREEN_WIDTH 800
#endif
/* Number of pixels per byte */
#ifndef EINK_PPB
#define EINK_PPB 4
#endif
/* Delay for generating clock pulses.
* Unit is approximate clock cycles of the CPU (0 to 15).
* This should be atleast 50 ns.
*/
#ifndef EINK_CLOCKDELAY
#define EINK_CLOCKDELAY 0
#endif
/* Width of one framebuffer block.
* Must be divisible by EINK_PPB and evenly divide GDISP_SCREEN_WIDTH. */
#ifndef EINK_BLOCKWIDTH
#define EINK_BLOCKWIDTH 20
#endif
/* Height of one framebuffer block.
* Must evenly divide GDISP_SCREEN_WIDTH. */
#ifndef EINK_BLOCKHEIGHT
#define EINK_BLOCKHEIGHT 20
#endif
/* Number of block buffers to use for framebuffer emulation. */
#ifndef EINK_NUMBUFFERS
#define EINK_NUMBUFFERS 40
#endif
/* Do a "blinking" clear, i.e. clear to opposite polarity first.
* This reduces the image persistence. */
#ifndef EINK_BLINKCLEAR
#define EINK_BLINKCLEAR GFXON
#endif
/* Number of passes to use when clearing the display */
#ifndef EINK_CLEARCOUNT
#define EINK_CLEARCOUNT 10
#endif
/* Number of passes to use when writing to the display */
#ifndef EINK_WRITECOUNT
#define EINK_WRITECOUNT 4
#endif
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
#define PRIV(g) ((drvPriv *)g->priv)
/* Delay between signal changes, to give time for IO pins to change state. */
static GFXINLINE void clockdelay(void)
{
#if EINK_CLOCKDELAY & 1
asm("nop");
#endif
#if EINK_CLOCKDELAY & 2
asm("nop");
asm("nop");
#endif
#if EINK_CLOCKDELAY & 4
asm("nop");
asm("nop");
asm("nop");
asm("nop");
#endif
#if EINK_CLOCKDELAY & 8
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
#endif
}
/* Fast vertical clock pulse for gate driver, used during initializations */
static void vclock_quick(GDisplay *g)
{
setpin_ckv(g, gTrue);
eink_delay(1);
setpin_ckv(g, gFalse);
eink_delay(4);
}
/* Horizontal clock pulse for clocking data into source driver */
static void hclock(GDisplay *g)
{
clockdelay();
setpin_cl(g, gTrue);
clockdelay();
setpin_cl(g, gFalse);
}
/* Start a new vertical gate driver scan from top.
* Note: Does not clear any previous bits in the shift register,
* so you should always scan through the whole display before
* starting a new scan.
*/
static void vscan_start(GDisplay *g)
{
setpin_gmode(g, gTrue);
vclock_quick(g);
setpin_spv(g, gFalse);
vclock_quick(g);
setpin_spv(g, gTrue);
vclock_quick(g);
}
/* Waveform for strobing a row of data onto the display.
* Attempts to minimize the leaking of color to other rows by having
* a long idle period after a medium-length strobe period.
*/
static void vscan_write(GDisplay *g)
{
setpin_ckv(g, gTrue);
setpin_oe(g, gTrue);
eink_delay(5);
setpin_oe(g, gFalse);
setpin_ckv(g, gFalse);
eink_delay(200);
}
/* Waveform used when clearing the display. Strobes a row of data to the
* screen, but does not mind some of it leaking to other rows.
*/
static void vscan_bulkwrite(GDisplay *g)
{
setpin_ckv(g, gTrue);
eink_delay(20);
setpin_ckv(g, gFalse);
eink_delay(200);
}
/* Waveform for skipping a vertical row without writing anything.
* Attempts to minimize the amount of change in any row.
*/
static void vscan_skip(GDisplay *g)
{
setpin_ckv(g, gTrue);
eink_delay(1);
setpin_ckv(g, gFalse);
eink_delay(100);
}
/* Stop the vertical scan. The significance of this escapes me, but it seems
* necessary or the next vertical scan may be corrupted.
*/
static void vscan_stop(GDisplay *g)
{
setpin_gmode(g, gFalse);
vclock_quick(g);
vclock_quick(g);
vclock_quick(g);
vclock_quick(g);
vclock_quick(g);
}
/* Start updating the source driver data (from left to right). */
static void hscan_start(GDisplay *g)
{
/* Disable latching and output enable while we are modifying the row. */
setpin_le(g, gFalse);
setpin_oe(g, gFalse);
/* The start pulse should remain low for the duration of the row. */
setpin_sph(g, gFalse);
}
/* Write data to the horizontal row. */
static void hscan_write(GDisplay *g, const uint8_t *data, int count)
{
while (count--)
{
/* Set the next byte on the data pins */
setpins_data(g, *data++);
/* Give a clock pulse to the shift register */
hclock(g);
}
}
/* Finish and transfer the row to the source drivers.
* Does not set the output enable, so the drivers are not yet active. */
static void hscan_stop(GDisplay *g)
{
/* End the scan */
setpin_sph(g, gTrue);
hclock(g);
/* Latch the new data */
setpin_le(g, gTrue);
clockdelay();
setpin_le(g, gFalse);
}
/* Turn on the power to the E-Ink panel, observing proper power sequencing. */
static void power_on(GDisplay *g)
{
unsigned i;
/* First the digital power supply and signal levels. */
setpower_vdd(g, gTrue);
setpin_le(g, gFalse);
setpin_oe(g, gFalse);
setpin_cl(g, gFalse);
setpin_sph(g, gTrue);
setpins_data(g, 0);
setpin_ckv(g, gFalse);
setpin_gmode(g, gFalse);
setpin_spv(g, gTrue);
/* Min. 100 microsecond delay after digital supply */
gfxSleepMicroseconds(100);
/* Then negative voltages and min. 1000 microsecond delay. */
setpower_vneg(g, gTrue);
gfxSleepMicroseconds(1000);
/* Finally the positive voltages. */
setpower_vpos(g, gTrue);
/* Clear the vscan shift register */
vscan_start(g);
for (i = 0; i < GDISP_SCREEN_HEIGHT; i++)
vclock_quick(g);
vscan_stop(g);
}
/* Turn off the power, observing proper power sequencing. */
static void power_off(GDisplay *g)
{
/* First the high voltages */
setpower_vpos(g, gFalse);
setpower_vneg(g, gFalse);
/* Wait for any capacitors to drain */
gfxSleepMilliseconds(100);
/* Then put all signals and digital supply to ground. */
setpin_le(g, gFalse);
setpin_oe(g, gFalse);
setpin_cl(g, gFalse);
setpin_sph(g, gFalse);
setpins_data(g, 0);
setpin_ckv(g, gFalse);
setpin_gmode(g, gFalse);
setpin_spv(g, gFalse);
setpower_vdd(g, gFalse);
}
/* ====================================
* Framebuffer emulation layer
* ==================================== */
#if EINK_PPB == 4
#define PIXELMASK 3
#define PIXEL_WHITE 2
#define PIXEL_BLACK 1
#define BYTE_WHITE 0xAA
#define BYTE_BLACK 0x55
#else
#error Unsupported EINK_PPB value.
#endif
#if GDISP_SCREEN_HEIGHT % EINK_BLOCKHEIGHT != 0
#error GDISP_SCREEN_HEIGHT must be evenly divisible by EINK_BLOCKHEIGHT
#endif
#if GDISP_SCREEN_WIDTH % EINK_BLOCKWIDTH != 0
#error GDISP_SCREEN_WIDTH must be evenly divisible by EINK_BLOCKWIDTH
#endif
#if EINK_BLOCKWIDTH % EINK_PPB != 0
#error EINK_BLOCKWIDTH must be evenly divisible by EINK_PPB
#endif
#if EINK_NUMBUFFERS > 254
#error EINK_NUMBUFFERS must be at most 254.
#endif
#define BLOCKS_Y (GDISP_SCREEN_HEIGHT / EINK_BLOCKHEIGHT)
#define BLOCKS_X (GDISP_SCREEN_WIDTH / EINK_BLOCKWIDTH)
#define WIDTH_BYTES (EINK_BLOCKWIDTH / EINK_PPB)
/* Buffers that store the data for a small area of the display. */
typedef struct {
uint8_t data[EINK_BLOCKHEIGHT][WIDTH_BYTES];
} block_t;
typedef struct drvPriv {
uint8_t g_next_block; /* Index of the next free block buffer. */
block_t g_blocks[EINK_NUMBUFFERS];
/* Map that stores the buffers associated to each area of the display.
* Value of 0 means that the block is not allocated.
* Other values are the index in g_blocks + 1.
*/
uint8_t g_blockmap[BLOCKS_Y][BLOCKS_X];
} drvPriv;
/* Check if the row contains any allocated blocks. */
static gBool blocks_on_row(GDisplay *g, unsigned by)
{
unsigned bx;
for (bx = 0; bx < BLOCKS_X; bx++)
{
if (PRIV(g)->g_blockmap[by][bx] != 0)
{
return gTrue;
}
}
return gFalse;
}
/* Write out a block row. */
static void write_block_row(GDisplay *g, unsigned by)
{
unsigned bx, dy, dx;
for (dy = 0; dy < EINK_BLOCKHEIGHT; dy++)
{
hscan_start(g);
for (bx = 0; bx < BLOCKS_X; bx++)
{
if (PRIV(g)->g_blockmap[by][bx] == 0)
{
for (dx = 0; dx < WIDTH_BYTES; dx++)
{
const uint8_t dummy = 0;
hscan_write(g, &dummy, 1);
}
}
else
{
block_t *block = &PRIV(g)->g_blocks[PRIV(g)->g_blockmap[by][bx] - 1];
hscan_write(g, &block->data[dy][0], WIDTH_BYTES);
}
}
hscan_stop(g);
vscan_write(g);
}
}
/* Clear the block map, i.e. deallocate all blocks */
static void clear_block_map(GDisplay *g)
{
unsigned bx, by;
for (by = 0; by < BLOCKS_Y; by++)
{
for (bx = 0; bx < BLOCKS_X; bx++)
{
PRIV(g)->g_blockmap[by][bx] = 0;
}
}
PRIV(g)->g_next_block = 0;
}
/* Initialize a newly allocated block. */
static void zero_block(block_t *block)
{
unsigned dx, dy;
for (dy = 0; dy < EINK_BLOCKHEIGHT; dy++)
{
for (dx = 0; dx < WIDTH_BYTES; dx++)
{
block->data[dy][dx] = 0;
}
}
}
/* Allocate a buffer
* Automatically flushes if all buffers are full. */
static block_t *alloc_buffer(GDisplay *g, unsigned bx, unsigned by)
{
block_t *result;
drvPriv *priv;
priv = PRIV(g);
if (priv->g_blockmap[by][bx] == 0)
{
if (priv->g_next_block >= EINK_NUMBUFFERS)
gdisp_lld_flush(g);
result = &priv->g_blocks[priv->g_next_block];
priv->g_blockmap[by][bx] = priv->g_next_block + 1;
priv->g_next_block++;
zero_block(result);
return result;
}
else
{
result = &priv->g_blocks[priv->g_blockmap[by][bx] - 1];
return result;
}
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
LLDSPEC gBool gdisp_lld_init(GDisplay *g) {
g->priv = gfxAlloc(sizeof(drvPriv));
init_board(g);
/* Make sure that all the pins are in "off" state.
* Having any pin high could cause voltage leaking to the
* display, which in turn causes the image to leak slowly away.
*/
power_off(g);
clear_block_map(g);
/* Initialise the GDISP structure */
g->g.Width = GDISP_SCREEN_WIDTH;
g->g.Height = GDISP_SCREEN_HEIGHT;
g->g.Orientation = gOrientation0;
g->g.Powermode = gPowerOn;
g->g.Backlight = 100;
g->g.Contrast = 100;
return gTrue;
}
#if GDISP_HARDWARE_FLUSH
LLDSPEC void gdisp_lld_flush(GDisplay *g) {
unsigned by, dy, i;
for (i = 0; i < EINK_WRITECOUNT; i++) {
vscan_start(g);
for (by = 0; by < BLOCKS_Y; by++) {
if (!blocks_on_row(g, by)) {
/* Skip the whole row of blocks. */
for (dy = 0; dy < EINK_BLOCKHEIGHT; dy++)
vscan_skip(g);
} else {
/* Write out the blocks. */
write_block_row(g, by);
}
}
vscan_stop(g);
}
clear_block_map(g);
}
#endif
#if GDISP_HARDWARE_DRAWPIXEL
void gdisp_lld_draw_pixel(GDisplay *g) {
block_t *block;
uint8_t byte;
unsigned bx, by, dx, dy;
uint8_t bitpos;
switch(g->g.Orientation) {
default:
case gOrientation0:
bx = g->p.x / EINK_BLOCKWIDTH;
dx = g->p.x % EINK_BLOCKWIDTH;
by = g->p.y / EINK_BLOCKHEIGHT;
dy = g->p.y % EINK_BLOCKHEIGHT;
break;
case gOrientation90:
bx = g->p.y / EINK_BLOCKWIDTH;
dx = g->p.y % EINK_BLOCKWIDTH;
by = (GDISP_SCREEN_HEIGHT-1 - g->p.x) / EINK_BLOCKHEIGHT;
dy = (GDISP_SCREEN_HEIGHT-1 - g->p.x) % EINK_BLOCKHEIGHT;
break;
case gOrientation180:
bx = (GDISP_SCREEN_WIDTH-1 - g->p.x) / EINK_BLOCKWIDTH;
dx = (GDISP_SCREEN_WIDTH-1 - g->p.x) % EINK_BLOCKWIDTH;
by = (GDISP_SCREEN_HEIGHT-1 - g->p.y) / EINK_BLOCKHEIGHT;
dy = (GDISP_SCREEN_HEIGHT-1 - g->p.y) % EINK_BLOCKHEIGHT;
break;
case gOrientation270:
bx = (GDISP_SCREEN_WIDTH-1 - g->p.y) / EINK_BLOCKWIDTH;
dx = (GDISP_SCREEN_WIDTH-1 - g->p.y) % EINK_BLOCKWIDTH;
by = g->p.x / EINK_BLOCKHEIGHT;
dy = g->p.x % EINK_BLOCKHEIGHT;
break;
}
block = alloc_buffer(g, bx, by);
bitpos = (6 - 2 * (dx % EINK_PPB));
byte = block->data[dy][dx / EINK_PPB];
byte &= ~(PIXELMASK << bitpos);
if (gdispColor2Native(g->p.color) != GFX_BLACK)
byte |= PIXEL_WHITE << bitpos;
else
byte |= PIXEL_BLACK << bitpos;
block->data[dy][dx / EINK_PPB] = byte;
}
#endif
#if GDISP_NEED_CONTROL && GDISP_HARDWARE_CONTROL
LLDSPEC void gdisp_lld_control(GDisplay *g) {
switch(g->p.x) {
case GDISP_CONTROL_POWER:
if (g->g.Powermode == (gPowermode)g->p.ptr)
return;
switch((gPowermode)g->p.ptr) {
case gPowerOff:
case gPowerSleep:
case gPowerDeepSleep:
gdisp_lld_flush(g);
power_off(g);
break;
case gPowerOn:
power_on(g);
break;
default:
return;
}
g->g.Powermode = (gPowermode)g->p.ptr;
return;
case GDISP_CONTROL_ORIENTATION:
if (g->g.Orientation == (gOrientation)g->p.ptr)
return;
switch((gOrientation)g->p.ptr) {
case gOrientation0:
case gOrientation180:
g->g.Height = GDISP_SCREEN_HEIGHT;
g->g.Width = GDISP_SCREEN_WIDTH;
break;
case gOrientation90:
case gOrientation270:
g->g.Height = GDISP_SCREEN_WIDTH;
g->g.Width = GDISP_SCREEN_HEIGHT;
break;
default:
return;
}
g->g.Orientation = (gOrientation)g->p.ptr;
return;
default:
return;
}
}
#endif
/* ===============================
* Accelerated routines
* =============================== */
#if GDISP_HARDWARE_CLEARS
static void subclear(GDisplay *g, gColor color) {
unsigned x, y;
uint8_t byte;
hscan_start(g);
byte = color ? BYTE_WHITE : BYTE_BLACK;
for (x = 0; x < GDISP_SCREEN_WIDTH; x++)
{
hscan_write(g, &byte, 1);
}
hscan_stop(g);
setpin_oe(g, gTrue);
vscan_start(g);
for (y = 0; y < GDISP_SCREEN_HEIGHT; y++)
vscan_bulkwrite(g);
vscan_stop(g);
setpin_oe(g, gFalse);
}
void gdisp_lld_clear(GDisplay *g) {
unsigned i;
clear_block_map(g);
if (EINK_BLINKCLEAR) {
subclear(g, !g->p.color);
gfxSleepMilliseconds(50);
}
for (i = 0; i < EINK_CLEARCOUNT; i++) {
subclear(g, g->p.color);
gfxSleepMilliseconds(10);
}
}
#endif
#endif // GFX_USE_GDISP
|