252 display/example/epd1in54.cpp
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/**
* @filename : epd1in54.cpp
* @brief : Implements for e-paper library
* @author : Yehui from Waveshare
*
* Copyright (C) Waveshare September 5 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 "epd1in54.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(const unsigned char* lut) {
/* this calls the peripheral hardware interface, see epdif */
if (IfInit() != 0) {
return -1;
}
/* EPD hardware init start */
this->lut = lut;
Reset();
SendCommand(DRIVER_OUTPUT_CONTROL);
SendData((EPD_HEIGHT - 1) & 0xFF);
SendData(((EPD_HEIGHT - 1) >> 8) & 0xFF);
SendData(0x00); // GD = 0; SM = 0; TB = 0;
SendCommand(BOOSTER_SOFT_START_CONTROL);
SendData(0xD7);
SendData(0xD6);
SendData(0x9D);
SendCommand(WRITE_VCOM_REGISTER);
SendData(0xA8); // VCOM 7C
SendCommand(SET_DUMMY_LINE_PERIOD);
SendData(0x1A); // 4 dummy lines per gate
SendCommand(SET_GATE_TIME);
SendData(0x08); // 2us per line
SendCommand(DATA_ENTRY_MODE_SETTING);
SendData(0x03); // X increment; Y increment
SetLut(this->lut);
/* 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 LOW
*/
void Epd::WaitUntilIdle(void) {
while(DigitalRead(busy_pin) == HIGH) { //LOW: idle, HIGH: busy
DelayMs(100);
}
}

/**
* @brief: module reset.
* often used to awaken the module in deep sleep,
* see Epd::Sleep();
*/
void Epd::Reset(void) {
DigitalWrite(reset_pin, LOW); //module reset
DelayMs(200);
DigitalWrite(reset_pin, HIGH);
DelayMs(200);
}

/**
* @brief: set the look-up table register
*/
void Epd::SetLut(const unsigned char* lut) {
this->lut = lut;
SendCommand(WRITE_LUT_REGISTER);
/* the length of look-up table is 30 bytes */
for (int i = 0; i < 30; i++) {
SendData(this->lut[i]);
}
}

/**
* @brief: put an image buffer to the frame memory.
* this won't update the display.
*/
void Epd::SetFrameMemory(
const unsigned char* image_buffer,
int x,
int y,
int image_width,
int image_height
) {
int x_end;
int y_end;

if (
image_buffer == NULL ||
x < 0 || image_width < 0 ||
y < 0 || image_height < 0
) {
return;
}
/* x point must be the multiple of 8 or the last 3 bits will be ignored */
x &= 0xF8;
image_width &= 0xF8;
if (x + image_width >= this->width) {
x_end = this->width - 1;
} else {
x_end = x + image_width - 1;
}
if (y + image_height >= this->height) {
y_end = this->height - 1;
} else {
y_end = y + image_height - 1;
}
SetMemoryArea(x, y, x_end, y_end);
SetMemoryPointer(x, y);
SendCommand(WRITE_RAM);
/* send the image data */
for (int j = 0; j < y_end - y + 1; j++) {
for (int i = 0; i < (x_end - x + 1) / 8; i++) {
SendData(image_buffer[i + j * (image_width / 8)]);
}
}
}

/**
* @brief: clear the frame memory with the specified color.
* this won't update the display.
*/
void Epd::ClearFrameMemory(unsigned char color) {
SetMemoryArea(0, 0, this->width - 1, this->height - 1);
SetMemoryPointer(0, 0);
SendCommand(WRITE_RAM);
/* send the color data */
for (int i = 0; i < this->width / 8 * this->height; i++) {
SendData(color);
}
}

/**
* @brief: update the display
* there are 2 memory areas embedded in the e-paper display
* but once this function is called,
* the the next action of SetFrameMemory or ClearFrame will
* set the other memory area.
*/
void Epd::DisplayFrame(void) {
SendCommand(DISPLAY_UPDATE_CONTROL_2);
SendData(0xC4);
SendCommand(MASTER_ACTIVATION);
SendCommand(TERMINATE_FRAME_READ_WRITE);
WaitUntilIdle();
}

/**
* @brief: private function to specify the memory area for data R/W
*/
void Epd::SetMemoryArea(int x_start, int y_start, int x_end, int y_end) {
SendCommand(SET_RAM_X_ADDRESS_START_END_POSITION);
/* x point must be the multiple of 8 or the last 3 bits will be ignored */
SendData((x_start >> 3) & 0xFF);
SendData((x_end >> 3) & 0xFF);
SendCommand(SET_RAM_Y_ADDRESS_START_END_POSITION);
SendData(y_start & 0xFF);
SendData((y_start >> 8) & 0xFF);
SendData(y_end & 0xFF);
SendData((y_end >> 8) & 0xFF);
}

/**
* @brief: private function to specify the start point for data R/W
*/
void Epd::SetMemoryPointer(int x, int y) {
SendCommand(SET_RAM_X_ADDRESS_COUNTER);
/* x point must be the multiple of 8 or the last 3 bits will be ignored */
SendData((x >> 3) & 0xFF);
SendCommand(SET_RAM_Y_ADDRESS_COUNTER);
SendData(y & 0xFF);
SendData((y >> 8) & 0xFF);
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.
* You can use Epd::Init() to awaken
*/
void Epd::Sleep() {
SendCommand(DEEP_SLEEP_MODE);
WaitUntilIdle();
}

const unsigned char lut_full_update[] =
{
0x02, 0x02, 0x01, 0x11, 0x12, 0x12, 0x22, 0x22,
0x66, 0x69, 0x69, 0x59, 0x58, 0x99, 0x99, 0x88,
0x00, 0x00, 0x00, 0x00, 0xF8, 0xB4, 0x13, 0x51,
0x35, 0x51, 0x51, 0x19, 0x01, 0x00
};

const unsigned char lut_partial_update[] =
{
0x10, 0x18, 0x18, 0x08, 0x18, 0x18, 0x08, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x13, 0x14, 0x44, 0x12,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


/* END OF FILE */


0 display/epd1in54.h → display/example/epd1in54.h
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63 display/example/epdif.cpp
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/**
* @filename : epdif.cpp
* @brief : Implements EPD interface functions
* Users have to implement all the functions in epdif.cpp
* @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 "epdif.h"
#include <wiringPi.h>
#include <wiringPiSPI.h>

EpdIf::EpdIf() {
};
EpdIf::~EpdIf() {
};

void EpdIf::DigitalWrite(int pin, int value) {
digitalWrite(pin, value);
}

int EpdIf::DigitalRead(int pin) {
return digitalRead(pin);
}

void EpdIf::DelayMs(unsigned int delaytime) {
delay(delaytime);
}

void EpdIf::SpiTransfer(unsigned char data) {
wiringPiSPIDataRW(0, &data, 1);
}

int EpdIf::IfInit(void) {
if(wiringPiSetupGpio() < 0) { // using Broadcom GPIO pin mapping
return -1;
}
pinMode(RST_PIN, OUTPUT);
pinMode(DC_PIN, OUTPUT);
pinMode(BUSY_PIN, INPUT);
wiringPiSPISetup(0, 2000000);
return 0;
}

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10 display/test.cpp
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#include "display.h"

#include <iostream>

int main()
{
auto display = Display::get();
std::cout << "got display" << std::endl;
return 0;
}
35 display/vec2.h
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#pragma once

#include <string>

template<typename T>
struct Vec2
{
T x, y;

Vec2(): x{}, y{} {}
Vec2(T x, T y): x{x}, y{y} {}

template<typename U>
inline operator Vec2<U>() { return Vec2<U>(x, y); }

inline bool operator== (const Vec2<T>& other) { return x == other.x && y == other.y; }
inline bool operator!= (const Vec2<T>& other) { return x!=other.x || y!=other.y; }
inline Vec2<T> operator+ (const Vec2<T>& other) { return Vec2<T>(x + other.x, y + other.y); }
inline void operator+= (const Vec2<T>& other) { x += other.x; y += other.y; }
inline Vec2<T> operator- (const Vec2<T>& other) { return Vec2<T>(x - other.x, y - other.y); }
inline Vec2<T> operator- () { return Vec2<T>(-x, -y); }
inline void operator-= (const Vec2<T>& other) { x -= other.x; y -= other.y; }
inline Vec2<T> operator* (T value) { return Vec2<T>(x * value, y * value); }
inline void operator*= (T value) { x *= value; y *= value; }
inline Vec2<T> operator/ (T value) { return Vec2<T>(x / value, y / value); }
inline void operator/= (T value) { x /= value; y /= value; }

std::string to_string()
{
return std::string("(") + std::to_string(x) + ", " + std::to_string(y) + ")";
}
};

typedef Vec2<int> Vec2i;
typedef Vec2<double> Vec2d;