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epd4in2b.cpp
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/**
* @filename : epd4in2.cpp
* @brief : Implements for Dual-color e-paper library
* @author : Yehui from Waveshare
*
* Copyright (C) Waveshare August 10 2017
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documnetation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <iostream>
#include "epd4in2b.h"
#include "epdif.h"
Epd::~Epd() {
};
Epd::Epd() {
reset_pin = RST_PIN;
dc_pin = DC_PIN;
cs_pin = CS_PIN;
busy_pin = BUSY_PIN;
width = EPD_WIDTH;
height = EPD_HEIGHT;
};
int Epd::Init(void) {
/* this calls the peripheral hardware interface, see epdif */
if (IfInit() != 0) {
return -1;
}
/* EPD hardware init start */
Reset();
SendCommand(POWER_SETTING);
SendData(0x03); // VDS_EN, VDG_EN
SendData(0x00); // VCOM_HV, VGHL_LV[1], VGHL_LV[0]
SendData(0x2b); // VDH
SendData(0x2b); // VDL
SendData(0xff); // VDHR
SendCommand(BOOSTER_SOFT_START);
SendData(0x17);
SendData(0x17);
SendData(0x17); //07 0f 17 1f 27 2F 37 2f
SendCommand(POWER_ON);
WaitUntilIdle();
SendCommand(PANEL_SETTING);
// SendData(0xbf); // KW-BF KWR-AF BWROTP 0f
// SendData(0x0b);
// SendData(0x0F); //300x400 Red mode, LUT from OTP
//SendData(0x1F); //300x400 B/W mode, LUT from OTP
SendData(0x3F); //300x400 B/W mode, LUT set by register
// SendData(0x2F); //300x400 Red mode, LUT set by register
SendCommand(PLL_CONTROL);
SendData(0x3C); // 3A 100Hz 29 150Hz 39 200Hz 31 171Hz 3C 50Hz (default) 0B 10Hz
//SendData(0x0B); //0B is 10Hz
// BVZ
SendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
SendData(0x17); //border floating
/* EPD hardware init end */
return 0;
}
/**
* @brief: basic function for sending commands
*/
void Epd::SendCommand(unsigned char command) {
DigitalWrite(dc_pin, LOW);
SpiTransfer(command);
}
/**
* @brief: basic function for sending data
*/
void Epd::SendData(unsigned char data) {
DigitalWrite(dc_pin, HIGH);
SpiTransfer(data);
}
/**
* @brief: Wait until the busy_pin goes HIGH
*/
void Epd::WaitUntilIdle(void) {
while(DigitalRead(busy_pin) == 0) { //0: busy, 1: idle
DelayMs(1);
}
}
/**
* @brief: module reset.
* often used to awaken the module in deep sleep,
* see Epd::Sleep();
*/
void Epd::Reset(void) {
DigitalWrite(reset_pin, LOW);
DelayMs(200);
DigitalWrite(reset_pin, HIGH);
DelayMs(200);
}
/**
* @brief: transmit partial data to the SRAM. The final parameter chooses between dtm=1 and dtm=2
*/
void Epd::SetPartialWindow(const unsigned char* buffer_black, int x, int y, int w, int l, int dtm) {
SendCommand(PARTIAL_IN);
SendCommand(PARTIAL_WINDOW);
SendData(x >> 8);
SendData(x & 0xf8); // x should be the multiple of 8, the last 3 bit will always be ignored
SendData(((x & 0xf8) + w - 1) >> 8);
SendData(((x & 0xf8) + w - 1) | 0x07);
SendData(y >> 8);
SendData(y & 0xff);
SendData((y + l - 1) >> 8);
SendData((y + l - 1) & 0xff);
//SendData(0x01); // Gates scan both inside and outside of the partial window. (default)
SendData(0x00); // Gates scan both inside and outside of the partial window. (bvz)
// DelayMs(2);
SendCommand((dtm == 1) ? DATA_START_TRANSMISSION_1 : DATA_START_TRANSMISSION_2);
if (buffer_black != NULL) {
for(int i = 0; i < w / 8 * l; i++) {
SendData(buffer_black[i]);
}
} else {
for(int i = 0; i < w / 8 * l; i++) {
SendData(0x00);
}
}
// DelayMs(2);
SendCommand(PARTIAL_OUT);
}
/**
* Note: frame_buffer is the frame buffer for the _full_ screen, this function
* only renders the portion of it within the partial frame
* @brief: Renders data to a partial section of the screen
*/
void Epd::DisplayPartialFrame(const unsigned char* frame_buffer, int x, int y, int w, int l) {
// This function has undergone quite a bit of tuning to do partial refreshes with minimal artifacts
// on the 4.2 tri-color epaper display, namely:
// - use a custom LUT (LutBvz): the default LUT not only does a lot of unnecessary blinking, it
// also creates noticible fading artifacts on pixels _outside_ the partial frame window
// - only scan gates inside the partial window: this reduces the impact on pixels outside the partial window
// - sending the data and refresh twice: with the custom LUT, the pixels don't always "stick" when going from one state to the next, this helps
// Prep
SetLutBvz();
//SetLut();
SendCommand(PARTIAL_IN);
SendCommand(PARTIAL_WINDOW);
// x should be the multiple of 8, the last 3 bit will always be ignored
x = x & 0xFF8;
//Horizontal start (first bit 8, then bits 7-3)
SendData(x >> 8);
SendData(x & 0x0FF);
//Horizontal end
SendData((x + w - 1) >> 8);
//Because we always do blocks of 8, max X always ends in 0b111
SendData(((x + w - 1) | 0x07) & 0x0FF);
//Vertical start
SendData(y >> 8);
SendData(y & 0xff);
//Vertical end
SendData((y + l - 1) >> 8);
SendData((y + l - 1) & 0xff);
//PTScan
SendData(0x00); // Gates scan only inside the partial window.
// We get better quality by doing it twice, and the custom LUT is very fast
for (int repeat = 0; repeat < 2; repeat++) {
// Send data
SendCommand(DATA_START_TRANSMISSION_2);
if (frame_buffer != NULL) {
for(unsigned int i = 0; i < width * height / 8; i++) {
int x_i = (i * 8) % width;
int y_i = (i * 8) / width;
// If we're "in frame", send the data, otherwise pass
if (x_i >= x && x_i < x + w && y_i >= y && y_i < y + l) {
SendData(frame_buffer[i]);
}
}
} else {
for(unsigned int i = 0; i < w * l / 8; i++) {
SendData(0x00);
}
}
SendCommand(DISPLAY_REFRESH);
DelayMs(100);
WaitUntilIdle();
}
SendCommand(PARTIAL_OUT);
}
/**
* @brief: set the look-up table
*/
void Epd::SetLut(void) {
unsigned int count;
SendCommand(LUT_FOR_VCOM); //vcom
for(count = 0; count < 44; count++) {
SendData(lut_vcom0[count]);
}
SendCommand(LUT_WHITE_TO_WHITE); //ww --
for(count = 0; count < 42; count++) {
SendData(lut_ww[count]);
}
SendCommand(LUT_BLACK_TO_WHITE); //bw r
for(count = 0; count < 42; count++) {
SendData(lut_bw[count]);
}
SendCommand(LUT_WHITE_TO_BLACK); //wb w
for(count = 0; count < 42; count++) {
SendData(lut_wb[count]);
}
SendCommand(LUT_BLACK_TO_BLACK); //bb b
for(count = 0; count < 42; count++) {
SendData(lut_bb[count]);
}
}
/**
* @brief: set the look-up table for quick display (partial refresh)
*/
void Epd::SetLutQuick(void) {
unsigned int count;
SendCommand(LUT_FOR_VCOM); //vcom
for(count = 0; count < 44; count++) {
SendData(lut_vcom0_quick[count]);
}
SendCommand(LUT_WHITE_TO_WHITE); //ww --
for(count = 0; count < 42; count++) {
SendData(lut_ww_quick[count]);
}
SendCommand(LUT_BLACK_TO_WHITE); //bw r
for(count = 0; count < 42; count++) {
SendData(lut_bw_quick[count]);
}
SendCommand(LUT_WHITE_TO_BLACK); //wb w
for(count = 0; count < 42; count++) {
SendData(lut_wb_quick[count]);
}
SendCommand(LUT_BLACK_TO_BLACK); //bb b
for(count = 0; count < 42; count++) {
SendData(lut_bb_quick[count]);
}
}
void Epd::SetLutBvz(void) {
unsigned int count;
SendCommand(LUT_FOR_VCOM); //vcom
for(count = 0; count < 44; count++) {
SendData(lut_vcom0_bvz[count]);
}
SendCommand(LUT_WHITE_TO_WHITE); //ww --
for(count = 0; count < 42; count++) {
SendData(lut_ww_bvz[count]);
}
SendCommand(LUT_BLACK_TO_WHITE); //bw r
for(count = 0; count < 42; count++) {
SendData(lut_bw_bvz[count]);
}
SendCommand(LUT_WHITE_TO_BLACK); //wb w
for(count = 0; count < 42; count++) {
SendData(lut_wb_bvz[count]);
}
SendCommand(LUT_BLACK_TO_BLACK); //bb b
for(count = 0; count < 42; count++) {
SendData(lut_bb_bvz[count]);
}
}
/**
* @brief: refresh and displays the frame
*/
void Epd::DisplayFrame(const unsigned char* frame_buffer) {
if (frame_buffer != NULL) {
SendCommand(DATA_START_TRANSMISSION_1);
for(unsigned int i = 0; i < width / 8 * height; i++) {
SendData(0xFF); // bit set: white, bit reset: black
}
DelayMs(2);
SendCommand(DATA_START_TRANSMISSION_2);
for(int i = 0; i < width / 8 * height; i++) {
SendData(frame_buffer[i]);
}
DelayMs(2);
}
SetLut();
SendCommand(DISPLAY_REFRESH);
DelayMs(100);
WaitUntilIdle();
}
/**
* @brief: clear the frame data from the SRAM, this won't refresh the display
*/
void Epd::ClearFrame(void) {
SendCommand(RESOLUTION_SETTING);
SendData(width >> 8);
SendData(width & 0xff);
SendData(height >> 8);
SendData(height & 0xff);
SendCommand(DATA_START_TRANSMISSION_1);
DelayMs(2);
for(unsigned int i = 0; i < width / 8 * height; i++) {
SendData(0xFF);
}
DelayMs(2);
SendCommand(DATA_START_TRANSMISSION_2);
DelayMs(2);
for(unsigned int i = 0; i < width / 8 * height; i++) {
SendData(0xFF);
}
DelayMs(2);
}
/**
* @brief: This displays the frame data from SRAM
*/
void Epd::DisplayFrame(void) {
SetLut();
SendCommand(DISPLAY_REFRESH);
DelayMs(100);
WaitUntilIdle();
}
void Epd::DisplayFrameQuick(void) {
SetLutQuick();
SendCommand(DISPLAY_REFRESH);
// DelayMs(100);
// WaitUntilIdle();
}
/**
* @brief: After this command is transmitted, the chip would enter the deep-sleep mode to save power.
* The deep sleep mode would return to standby by hardware reset. The only one parameter is a
* check code, the command would be executed if check code = 0xA5.
* You can use Epd::Reset() to awaken and use Epd::Init() to initialize.
*/
void Epd::Sleep() {
SendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
SendData(0x17); //border floating
SendCommand(VCM_DC_SETTING); //VCOM to 0V
SendCommand(PANEL_SETTING);
DelayMs(100);
SendCommand(POWER_SETTING); //VG&VS to 0V fast
SendData(0x00);
SendData(0x00);
SendData(0x00);
SendData(0x00);
SendData(0x00);
DelayMs(100);
SendCommand(POWER_OFF); //power off
WaitUntilIdle();
SendCommand(DEEP_SLEEP); //deep sleep
SendData(0xA5);
}
#define TP0A 2 // sustain phase for bb and ww, change phase for bw and wb
#define TP0B 45 // change phase for bw and wb
const unsigned char lut_vcom0[] =
{
0x40, 0x17, 0x00, 0x00, 0x00, 0x02,
0x00, 0x17, 0x17, 0x00, 0x00, 0x02,
0x00, 0x0A, 0x01, 0x00, 0x00, 0x01,
0x00, 0x0E, 0x0E, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const unsigned char lut_vcom0_quick[] =
{
0x00, 0x0E, 0x00, 0x00, 0x00, 0x01,
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, 0x00, 0x00,
};
const unsigned char lut_vcom0_bvz[] =
{
0x00, TP0A, TP0B, 0x01, 0x00, 0x01,
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, 0x00, 0x00,
};
const unsigned char lut_ww[] ={
0x40, 0x17, 0x00, 0x00, 0x00, 0x02,
0x90, 0x17, 0x17, 0x00, 0x00, 0x02,
0x40, 0x0A, 0x01, 0x00, 0x00, 0x01,
0xA0, 0x0E, 0x0E, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const unsigned char lut_ww_quick[] ={
0xA0, 0x0E, 0x00, 0x00, 0x00, 0x01,
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,
};
const unsigned char lut_ww_bvz[] ={
0x80, // 10 00 00 00
TP0A, TP0B, 0x01, 0x00, 0x01,
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,
};
const unsigned char lut_bw[] ={
0x40, 0x17, 0x00, 0x00, 0x00, 0x02,
0x90, 0x17, 0x17, 0x00, 0x00, 0x02,
0x40, 0x0A, 0x01, 0x00, 0x00, 0x01,
0xA0, 0x0E, 0x0E, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const unsigned char lut_bw_quick[] ={
0xA0, 0x0E, 0x00, 0x00, 0x00, 0x01,
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,
};
const unsigned char lut_bw_bvz[] ={
0xA0, // 10 10 00 00
TP0A, TP0B, 0x01, 0x00, 0x01,
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,
};
const unsigned char lut_bb[] ={
0x80, 0x17, 0x00, 0x00, 0x00, 0x02,
0x90, 0x17, 0x17, 0x00, 0x00, 0x02,
0x80, 0x0A, 0x01, 0x00, 0x00, 0x01,
0x50, 0x0E, 0x0E, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const unsigned char lut_bb_quick[] ={
0x50, 0x0E, 0x00, 0x00, 0x00, 0x01,
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,
};
const unsigned char lut_bb_bvz[] ={
0x40, // 01 00 00 00
TP0A, TP0B, 0x01, 0x00, 0x01,
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,
};
const unsigned char lut_wb[] ={
0x80, 0x17, 0x00, 0x00, 0x00, 0x02,
0x90, 0x17, 0x17, 0x00, 0x00, 0x02,
0x80, 0x0A, 0x01, 0x00, 0x00, 0x01,
0x50, 0x0E, 0x0E, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const unsigned char lut_wb_quick[] ={
0x50, 0x0E, 0x00, 0x00, 0x00, 0x01,
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,
};
const unsigned char lut_wb_bvz[] ={
0x50, // 01 01 00 00
TP0A, TP0B, 0x01, 0x00, 0x01,
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,
};
/* END OF FILE */