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gdew075T7.cpp
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gdew075T7.cpp
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#include "gdew075T7.h"
#include <stdio.h>
#include <stdlib.h>
#include "esp_log.h"
#include "freertos/task.h"
#include <stdint.h>
#include <stdbool.h>
#include <inttypes.h>
/*
The EPD needs a bunch of command/data values to be initialized. They are send using the IO class
Manufacturer sample: https://github.com/waveshare/e-Paper/blob/master/Arduino/epd7in5_V2/epd7in5_V2.cpp
*/
#define T1 0x19 // charge balance pre-phase
#define T2 0x01 // optional extension
#define T3 0x00 // color change phase (b/w)
#define T4 0x00 // optional extension for one color
// Partial Update Delay, may have an influence on degradation
#define GDEW075T7_PU_DELAY 100
// Partial display Waveform
DRAM_ATTR const epd_init_42 Gdew075T7::lut_20_LUTC_partial = {
0x20, {0x00, T1, T2, T3, T4, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, 42};
DRAM_ATTR const epd_init_42 Gdew075T7::lut_21_LUTWW_partial = {
0x21, {
0x00, T1, T2, T3, T4, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
42};
DRAM_ATTR const epd_init_42 Gdew075T7::lut_22_LUTKW_partial = {
0x22, {
0x80, T1, T2, T3, T4, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
42};
DRAM_ATTR const epd_init_42 Gdew075T7::lut_23_LUTWK_partial = {
0x23, {
0x40, T1, T2, T3, T4, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
//0xA5 more black
},
42};
DRAM_ATTR const epd_init_42 Gdew075T7::lut_24_LUTKK_partial = {
0x24, {// 01 b
0x00, T1, T2, T3, T4, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
42};
DRAM_ATTR const epd_init_42 Gdew075T7::lut_25_LUTBD_partial = {
0x25, {// 01 b
0x00, T1, T2, T3, T4, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
42};
// 0x07 (2nd) VGH=20V,VGL=-20V
// 0x3f (1st) VDH= 15V
// 0x3f (2nd) VDH=-15V
DRAM_ATTR const epd_power_4 Gdew075T7::epd_wakeup_power = {
0x01, {0x07, 0x07, 0x3f, 0x3f}, 4};
DRAM_ATTR const epd_init_1 Gdew075T7::epd_panel_setting_full = {
0x00, {0x1f}, 1};
DRAM_ATTR const epd_init_1 Gdew075T7::epd_panel_setting_partial = {
0x00, {0x3f}, 1};
DRAM_ATTR const epd_init_4 Gdew075T7::epd_resolution = {
0x61, {GDEW075T7_WIDTH / 256, //source 800
GDEW075T7_WIDTH % 256,
GDEW075T7_HEIGHT / 256, //gate 480
GDEW075T7_HEIGHT % 256},
4};
// Constructor
Gdew075T7::Gdew075T7(EpdSpi &dio) : Adafruit_GFX(GDEW075T7_WIDTH, GDEW075T7_HEIGHT),
Epd(GDEW075T7_WIDTH, GDEW075T7_HEIGHT), IO(dio)
{
printf("Gdew075T7() constructor injects IO and extends Adafruit_GFX(%d,%d) Pix Buffer[%d]\n",
GDEW075T7_WIDTH, GDEW075T7_HEIGHT, (int)GDEW075T7_BUFFER_SIZE);
printf("\nAvailable heap after Epd bootstrap:%d\n", (int) xPortGetFreeHeapSize());
}
void Gdew075T7::initFullUpdate()
{
IO.cmd(epd_panel_setting_full.cmd); // panel setting
IO.data(epd_panel_setting_full.data[0]); // full update LUT from OTP
}
void Gdew075T7::initPartialUpdate()
{
IO.cmd(epd_panel_setting_partial.cmd); // panel setting
IO.data(epd_panel_setting_partial.data[0]); // partial update LUT from registers
IO.cmd(0x82); // vcom_DC setting
// (0x2C); // -2.3V same value as in OTP
IO.data(0x26); // -2.0V
// (0x1C); // -1.5V
IO.cmd(0x50); // VCOM AND DATA INTERVAL SETTING
IO.data(0x39); // LUTBD, N2OCP: copy new to old
IO.data(0x07);
// LUT Tables for partial update. Send them directly in 42 bytes chunks. In total 210 bytes
IO.cmd(lut_20_LUTC_partial.cmd);
IO.data(lut_20_LUTC_partial.data, lut_20_LUTC_partial.databytes);
IO.cmd(lut_21_LUTWW_partial.cmd);
IO.data(lut_21_LUTWW_partial.data, lut_21_LUTWW_partial.databytes);
IO.cmd(lut_22_LUTKW_partial.cmd);
IO.data(lut_22_LUTKW_partial.data, lut_22_LUTKW_partial.databytes);
IO.cmd(lut_23_LUTWK_partial.cmd);
IO.data(lut_23_LUTWK_partial.data, lut_23_LUTWK_partial.databytes);
IO.cmd(lut_24_LUTKK_partial.cmd);
IO.data(lut_24_LUTKK_partial.data, lut_24_LUTKK_partial.databytes);
IO.cmd(lut_25_LUTBD_partial.cmd);
IO.data(lut_25_LUTBD_partial.data, lut_25_LUTBD_partial.databytes);
}
//Initialize the display
void Gdew075T7::init(bool debug)
{
debug_enabled = debug;
if (debug_enabled)
printf("Gdew075T7::init(debug:%d)\n", debug);
//Initialize SPI at 4MHz frequency. true for debug
IO.init(4, false);
fillScreen(EPD_WHITE);
_wakeUp();
}
void Gdew075T7::fillScreen(uint16_t color)
{
uint8_t data = (color == EPD_BLACK) ? GDEW075T7_8PIX_BLACK : GDEW075T7_8PIX_WHITE;
for (uint16_t x = 0; x < sizeof(_buffer); x++)
{
_buffer[x] = data;
}
}
void Gdew075T7::_wakeUp()
{
IO.reset(10);
//IMPORTANT: Some EPD controllers like to receive data byte per byte
//So this won't work:
//IO.data(epd_wakeup_power.data,epd_wakeup_power.databytes);
IO.cmd(epd_wakeup_power.cmd);
for (int i = 0; i < epd_wakeup_power.databytes; ++i)
{
IO.data(epd_wakeup_power.data[i]);
}
IO.cmd(0x04);
_waitBusy("_wakeUp power on");
IO.cmd(epd_panel_setting_full.cmd);
for (int i = 0; i < epd_panel_setting_full.databytes; ++i)
{
IO.data(epd_panel_setting_full.data[i]);
}
// Resolution setting
IO.cmd(epd_resolution.cmd);
for (int i = 0; i < epd_resolution.databytes; ++i)
{
IO.data(epd_resolution.data[i]);
}
// Not sure if 0x15 is really needed, seems to work the same without it too
IO.cmd(0x15); // Dual SPI
IO.data(0x00); // MM_EN, DUSPI_EN
IO.cmd(0x50); // VCOM AND DATA INTERVAL SETTING
IO.data(0x29); // LUTKW, N2OCP: copy new to old
IO.data(0x17); // 07 was original, with 0x17 seems to work better (more black)
IO.cmd(0x60); // TCON SETTING
IO.data(0x22);
initFullUpdate();
}
void Gdew075T7::update()
{
uint64_t startTime = esp_timer_get_time();
_using_partial_mode = false;
_wakeUp();
IO.cmd(0x13);
printf("Sending a %d bytes buffer via SPI\n", sizeof(_buffer));
// v2 SPI optimizing. Check: https://github.com/martinberlin/cale-idf/wiki/About-SPI-optimization
uint16_t i = 0;
uint8_t xLineBytes = GDEW075T7_WIDTH / 8;
uint8_t x1buf[xLineBytes];
for (uint16_t y = 1; y <= GDEW075T7_HEIGHT; y++)
{
for (uint16_t x = 1; x <= xLineBytes; x++)
{
uint8_t data = i < sizeof(_buffer) ? _buffer[i] : 0x00;
x1buf[x - 1] = data;
if (x == xLineBytes)
{ // Flush the X line buffer to SPI
IO.data(x1buf, sizeof(x1buf));
}
++i;
}
}
uint64_t endTime = esp_timer_get_time();
IO.cmd(0x12);
_waitBusy("update");
uint64_t updateTime = esp_timer_get_time();
printf("\n\nSTATS (ms)\n%llu _wakeUp settings+send Buffer\n%llu update \n%llu total time in millis\n",
(endTime - startTime) / 1000, (updateTime - endTime) / 1000, (updateTime - startTime) / 1000);
// Additional 2 seconds wait before sleeping since in low temperatures full update takes longer
vTaskDelay(2000 / portTICK_PERIOD_MS);
_sleep();
}
uint16_t Gdew075T7::_setPartialRamArea(uint16_t x, uint16_t y, uint16_t xe, uint16_t ye)
{
x &= 0xFFF8; // byte boundary
xe = (xe - 1) | 0x0007; // byte boundary - 1
IO.cmd(0x90); // partial window
IO.data(x / 256);
IO.data(x % 256);
IO.data(xe / 256);
IO.data(xe % 256);
IO.data(y / 256);
IO.data(y % 256);
IO.data(ye / 256);
IO.data(ye % 256);
IO.data(0x00);
return (7 + xe - x) / 8; // number of bytes to transfer per line
}
void Gdew075T7::updateWindow(uint16_t x, uint16_t y, uint16_t w, uint16_t h, bool using_rotation)
{
printf("updateWindow: Still in test mode\n");
if (using_rotation)
_rotate(x, y, w, h);
if (x >= GDEW075T7_WIDTH)
return;
if (y >= GDEW075T7_HEIGHT)
return;
uint16_t xe = gx_uint16_min(GDEW075T7_WIDTH, x + w) - 1;
uint16_t ye = gx_uint16_min(GDEW075T7_HEIGHT, y + h) - 1;
// x &= 0xFFF8; // byte boundary, need to test this
uint16_t xs_bx = x / 8;
uint16_t xe_bx = (xe + 7) / 8;
if (!_using_partial_mode) {
_wakeUp();
}
_using_partial_mode = true;
initPartialUpdate();
{ // leave both controller buffers equal
IO.cmd(0x91); // partial in
_setPartialRamArea(x, y, xe, ye);
IO.cmd(0x13);
for (int16_t y1 = y; y1 <= ye; y1++)
{
for (int16_t x1 = xs_bx; x1 < xe_bx; x1++)
{
uint16_t idx = y1 * (GDEW075T7_WIDTH / 8) + x1;
// white is 0x00 in buffer
uint8_t data = (idx < sizeof(_buffer)) ? _buffer[idx] : 0x00;
// white is 0xFF on device
IO.data(data);
if (idx % 8 == 0)
{
#if defined CONFIG_IDF_TARGET_ESP32 && ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 0, 0)
rtc_wdt_feed();
#endif
vTaskDelay(pdMS_TO_TICKS(1));
}
}
}
IO.cmd(0x12); // display refresh
_waitBusy("updateWindow");
IO.cmd(0x92); // partial out
}
vTaskDelay(GDEW075T7_PU_DELAY / portTICK_PERIOD_MS);
}
void Gdew075T7::_waitBusy(const char *message)
{
if (debug_enabled)
{
ESP_LOGI(TAG, "_waitBusy for %s", message);
}
int64_t time_since_boot = esp_timer_get_time();
while (1)
{
if (gpio_get_level((gpio_num_t)CONFIG_EINK_BUSY) == 1)
break;
vTaskDelay(1);
if (esp_timer_get_time() - time_since_boot > 2000000)
{
if (debug_enabled)
ESP_LOGI(TAG, "Busy Timeout");
break;
}
}
}
void Gdew075T7::_sleep()
{
IO.cmd(0x02);
_waitBusy("power_off");
IO.cmd(0x07); // Deep sleep
IO.data(0xA5);
}
void Gdew075T7::_rotate(uint16_t &x, uint16_t &y, uint16_t &w, uint16_t &h)
{
switch (getRotation())
{
case 1:
swap(x, y);
swap(w, h);
x = GDEW075T7_WIDTH - x - w - 1;
break;
case 2:
x = GDEW075T7_WIDTH - x - w - 1;
y = GDEW075T7_HEIGHT - y - h - 1;
break;
case 3:
swap(x, y);
swap(w, h);
y = GDEW075T7_HEIGHT - y - h - 1;
break;
}
}
void Gdew075T7::drawPixel(int16_t x, int16_t y, uint16_t color)
{
if ((x < 0) || (x >= width()) || (y < 0) || (y >= height()))
return;
switch (getRotation())
{
case 1:
swap(x, y);
x = GDEW075T7_WIDTH - x - 1;
break;
case 2:
x = GDEW075T7_WIDTH - x - 1;
y = GDEW075T7_HEIGHT - y - 1;
break;
case 3:
swap(x, y);
y = GDEW075T7_HEIGHT - y - 1;
break;
}
uint16_t i = x / 8 + y * GDEW075T7_WIDTH / 8;
if (color)
{
_buffer[i] = (_buffer[i] | (1 << (7 - x % 8)));
}
else
{
_buffer[i] = (_buffer[i] & (0xFF ^ (1 << (7 - x % 8))));
}
}