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
|
#include <stdio.h>
#include <string.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <driver/spi_master.h>
#include <driver/gpio.h>
#include <esp_log.h>
#include "epd.h"
#include "util.h"
#define EPD_SCREEN_WIDTH 800
#define EPD_SCREEN_HEIGHT 480
#define EPD_CS_PIN GPIO_NUM_5
#define EPD_DC_PIN GPIO_NUM_15
#define EPD_RST_PIN GPIO_NUM_2
#define EPD_CLK_PIN GPIO_NUM_18
#define EPD_MOSI_PIN GPIO_NUM_23
#define EPD_BUSY_PIN GPIO_NUM_4
static const char* TAG = "EPD";
static spi_device_handle_t spi = NULL;
static uint8_t VOLTAGE_FRAME[] = {
0x6, 0x3F, 0x3F, 0x11, 0x24, 0x7, 0x17,
};
static uint8_t LUT_VCOM[] = {
0x0, 0xF, 0xF, 0x0, 0x0, 0x1,
0x0, 0xF, 0x1, 0xF, 0x1, 0x2,
0x0, 0xF, 0xF, 0x0, 0x0, 0x1,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
};
static uint8_t LUT_WW[] = {
0x10, 0xF, 0xF, 0x0, 0x0, 0x1,
0x84, 0xF, 0x1, 0xF, 0x1, 0x2,
0x20, 0xF, 0xF, 0x0, 0x0, 0x1,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
};
static uint8_t LUT_BW[] = {
0x10, 0xF, 0xF, 0x0, 0x0, 0x1,
0x84, 0xF, 0x1, 0xF, 0x1, 0x2,
0x20, 0xF, 0xF, 0x0, 0x0, 0x1,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
};
static uint8_t LUT_WB[] = {
0x80, 0xF, 0xF, 0x0, 0x0, 0x1,
0x84, 0xF, 0x1, 0xF, 0x1, 0x2,
0x40, 0xF, 0xF, 0x0, 0x0, 0x1,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
};
static uint8_t LUT_BB[] = {
0x80, 0xF, 0xF, 0x0, 0x0, 0x1,
0x84, 0xF, 0x1, 0xF, 0x1, 0x2,
0x40, 0xF, 0xF, 0x0, 0x0, 0x1,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
};
static void spi_pre_cb_handler(spi_transaction_t *t)
{
int dc = (int)t->user;
gpio_set_level(EPD_DC_PIN, dc);
}
static void send_cmd(uint8_t cmd)
{
spi_transaction_t t;
memset(&t, 0, sizeof(t));
t.length = 8;
t.tx_buffer = &cmd;
t.user = (void*)0;
ESP_ERROR_CHECK(spi_device_polling_transmit(spi, &t));
}
static void send_data(uint8_t data)
{
spi_transaction_t t;
memset(&t, 0, sizeof(t));
t.length = 8;
t.tx_buffer = &data;
t.user = (void*)1;
ESP_ERROR_CHECK(spi_device_polling_transmit(spi, &t));
}
static inline void wait_until_idle(void)
{
int busy;
ESP_LOGI(TAG, "busy...");
do {
send_cmd(0x71);
busy = gpio_get_level(EPD_BUSY_PIN);
} while(busy == 0);
ESP_LOGI(TAG, "ready");
delay_ms(20);
}
static inline void reset(void)
{
ESP_ERROR_CHECK(gpio_set_level(EPD_RST_PIN, 1));
delay_ms(200);
ESP_ERROR_CHECK(gpio_set_level(EPD_RST_PIN, 0));
delay_ms(2);
ESP_ERROR_CHECK(gpio_set_level(EPD_RST_PIN, 1));
delay_ms(200);
}
static inline void config_lut(uint8_t cmd, const uint8_t *lut)
{
uint8_t i;
send_cmd(cmd);
for(i = 0; i < 42; i++)
send_data(lut[i]);
}
static inline void gpio_init(void)
{
gpio_config_t io_cfg = {
.pin_bit_mask = ((1ULL << EPD_DC_PIN) | (1ULL << EPD_RST_PIN) | (1ULL << EPD_BUSY_PIN)),
.pull_up_en = true
};
ESP_ERROR_CHECK(gpio_config(&io_cfg));
ESP_ERROR_CHECK(gpio_set_direction(EPD_DC_PIN, GPIO_MODE_OUTPUT));
ESP_ERROR_CHECK(gpio_set_direction(EPD_RST_PIN, GPIO_MODE_OUTPUT));
ESP_ERROR_CHECK(gpio_set_direction(EPD_BUSY_PIN, GPIO_MODE_INPUT));
}
static void spi_init(void)
{
spi_bus_config_t bus_cfg = {
.miso_io_num = -1,
.mosi_io_num = EPD_MOSI_PIN,
.sclk_io_num = EPD_CLK_PIN,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 8
};
ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &bus_cfg, SPI_DMA_CH_AUTO));
spi_device_interface_config_t dev_cfg = {
.clock_speed_hz = 10 * 1000 * 1000,
.mode = 0,
.spics_io_num = EPD_CS_PIN,
.queue_size = 1,
.pre_cb = spi_pre_cb_handler
};
ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi));
}
void epd_init(void)
{
spi_init();
gpio_init();
reset();
send_cmd(0x01);
send_data(0x07);
send_data(*(VOLTAGE_FRAME + 6));
send_data(*(VOLTAGE_FRAME + 1));
send_data(*(VOLTAGE_FRAME + 2));
send_data(*(VOLTAGE_FRAME + 3));
send_cmd(0x82);
send_data(*(VOLTAGE_FRAME + 4));
send_cmd(0x06);
send_data(0x27);
send_data(0x27);
send_data(0x2F);
send_data(0x17);
send_cmd(0x30);
send_data(*(VOLTAGE_FRAME + 0));
send_cmd(0x04);
delay_ms(100);
wait_until_idle();
send_cmd(0x00);
send_data(0x3F);
send_cmd(0x61);
send_data(0x03);
send_data(0x20);
send_data(0x01);
send_data(0xE0);
send_cmd(0x15);
send_data(0x00);
send_cmd(0x50);
send_data(0x10);
send_data(0x00);
send_cmd(0x60);
send_data(0x22);
send_cmd(0x65);
send_data(0x00);
send_data(0x00);
send_data(0x00);
send_data(0x00);
config_lut(0x20, LUT_VCOM);
config_lut(0x21, LUT_WW);
config_lut(0x22, LUT_BW);
config_lut(0x23, LUT_WB);
config_lut(0x24, LUT_BB);
}
static inline void refresh()
{
send_cmd(0x12);
delay_ms(100);
wait_until_idle();
}
void epd_clear(void)
{
uint16_t i, width, height;
width = (EPD_SCREEN_WIDTH % 8 == 0) ? (EPD_SCREEN_WIDTH / 8 ) : (EPD_SCREEN_WIDTH / 8 + 1);
height = EPD_SCREEN_HEIGHT;
send_cmd(0x10);
for(i = 0; i < height * width; i++)
send_data(0x00);
send_cmd(0x13);
for(i = 0; i < height * width; i++)
send_data(0x00);
refresh();
}
void epd_draw(const uint8_t pb[48000])
{
uint32_t i, j, width, height;
width = (EPD_SCREEN_WIDTH % 8 == 0) ? (EPD_SCREEN_WIDTH / 8 ) : (EPD_SCREEN_WIDTH / 8 + 1);
height = EPD_SCREEN_HEIGHT;
send_cmd(0x13);
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++)
send_data(~pb[i * width + j]);
}
refresh();
}
void epd_sleep(void)
{
send_cmd(0x02);
wait_until_idle();
send_cmd(0x07);
send_data(0xA5);
}
|
