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DisplayESP32
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Display SSD1306 for ESP32
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DisplayESP32/DisplayESP32.ino

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#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define __DEBUG__
//The following constants are used to configure the behaviour of the interface
// MAX_OPTIONS defines the maximum number of options a menu can hold
// MAX_MENUS declares the maximum number of menu screens in the interface
// MAX_GRAPHS is the maximum number of graphs to create
// DISP_WIDTH and DISP_HEIGHT are hardware specific (SSD1306)
// REFRESH: is the time in miliseconds the interface will take in refreshing (this time affects the loop, keep that in mind)
#define MAX_OPTIONS 10 //Maximum number of options for each menu
#define MAX_MENUS 3
#define MAX_GRAPH 3
#define DISP_WIDTH 128 // OLED display width
#define DISP_HEIGHT 64 // OLED display height
#define REFRESH 10 //Refresh time in ms
Adafruit_SSD1306 display(DISP_WIDTH, DISP_HEIGHT, &Wire, -1);
int i = 0;
class Option{
private:
int sizex; //Defines the size it will occupy in the x axis (width), this value is gotten from the menu
int sizey; //Defines the height of the option (this value is gotten from the menu it belongs to)
String content; //Text of the option
int pos; //Defines the position it has in the menu
int textSpacing; //According to the height, defines the space for the text, so that it's vertically centered
bool fill = false; //In case an option is not selected this should be false
bool disp = false; //In case an option is not configured, it should be false and, thus hidden
int destinationType; //Defines what the option leads to (another menu, graph, something else)
int destinationIndex; //Defines where the option leads to (index of the destination)
public:
//Option(){}
//Method to configure an option, all attributes are assigned, and disp is true, so the option can be displayed
void configure(String content, int sizex, int sizey, int pos, int destinationType, int destinationIndex){
this->sizex = sizex;
this->sizey = sizey;
this->content = content;
this->pos = pos;
this->destinationType = destinationType;
this->destinationIndex = destinationIndex;
this->disp = true;
this->textSpacing = ((sizey - 7)/2) + 7;
}
int getDestinationType(){
int destinationType = this->destinationType;
return destinationType;
}
int getDestinationIndex(){
int destinationIndex = this->destinationIndex;
return destinationIndex;
}
//This method draws each option
void drawopt(int page, int pos, int optPPage){
if(this->disp){ //Checks if the option was configured and, as a result, is displayable
if(this->pos == pos){ //If the position of the option corresponds to the position passed to the function, then it should be selected
display.fillRect(0, (this->sizey)*(this->pos) + 1 - (page*optPPage*this->sizey), this->sizex, this->sizey, WHITE);
display.setTextColor(SSD1306_BLACK);
display.setCursor(5, (this->sizey)*(this->pos + 1) - (page*optPPage*this->sizey) - this->textSpacing);
display.print(this->content);
display.setTextColor(SSD1306_WHITE);
}
else{ //If the option is not selected, the rectangle containing it shouldn't be filled
display.drawRect(0, (this->sizey)*(this->pos) + 1 - (page*optPPage*this->sizey), this->sizex, this->sizey, WHITE);
display.setCursor(5, (this->sizey)*(this->pos + 1) - (page*optPPage*this->sizey) - this->textSpacing);
display.print(this->content);
}
}
}
};
class Menu{ //ContentTypeMenu true, it is a menu
private:
int sizex; //X size for each option in the menu
int sizey; //Y size of each option in the menu
int options = 0; //This indicates the number of options created
int pos = 0; //This indicates the position of the cursor
int page = 0; //If the menu is too long, this indicates the page that is being displayed
Option opt[MAX_OPTIONS];
int optPPage;
int previousScreen = 0;
int previousContentType = 0;
public:
void configure(int sizex, int sizey){ //This method configures the menu created from Screen
this->sizex = sizex;
this->sizey = sizey;
this->optPPage = DISP_HEIGHT / this->sizey;
}
//The following method is used to created an option for the menu
void createOption(String content, bool destinationTypeMenu, int destinationIndex){
//The option takes the place in the array defined by the options number variable (options), which is later increased.
this->opt[this->options].configure(content, this->sizex, this->sizey, this->options++, destinationTypeMenu, destinationIndex);
}
int extractDestinationType(){
int destinationType = this->opt[this->pos].getDestinationType();
return destinationType;
}
int extractDestinationIndex(){
int destinationIndex = this->opt[this->pos].getDestinationIndex();
return destinationIndex;
}
void drawMenu(){
display.clearDisplay();
this->page = pos/this->optPPage;
for(int i = 0; i < options; i++){
this->opt[i].drawopt(this->page, this->pos, this->optPPage);
}
display.display();
}
int extractPos(){
return(this->pos);
}
int extractOptNumber(){
return(this->options);
}
void increasePos(){
this->pos++;
}
void decreasePos(){
this->pos--;
}
void setPreviousScreen(int prev){
this->previousScreen = prev;
}
void setPreviousContentType(int prev){
this->previousContentType = prev;
}
int getPreviousScreen(){
int prev = this->previousScreen;
return prev;
}
int getPreviousContentType(){
int prev = this->previousContentType;
return prev;
}
};
class Graph{ //ContentTypeMenu false, it is not a menu
private:
String title;
char graphType; //'a' Vertical Bar, 'b' Horizontal Bar, 'c' Cartesian Graph
//Assign whatever value in "configure(..." if a parameter is not required for the specified graphType
double value; //For: Vertical Bar Horizontal Bar Cartesian
double xpos; //For: Vertical Bar Horizontal Bar Cartesian
double ypos; //For: Vertical Bar Horizontal Bar Cartesian
double height; //For: Vertical Bar Horizontal Bar Cartesian
double width; //For: Vertical Bar Horizontal Bar Cartesian
double yminimum; //For: Vertical Bar Cartesian
double ymaximum; //For: Vertical Bar Cartesian
double xminimum; //For: Horizontal Bar Cartesian
double xmaximum; //For: Horizontal Bar Cartesian
double yStepSize; //For: Vertical Bar Cartesian
double xStepSize; //For: Horizontal Bar Cartesian
double digit; //For: Vertical Bar Horizontal Bar Cartesian
double x;
double yrange;
double xrange;
double ox;
double oy;
double count;
double graphScale;
bool redraw = true;
int previousScreen = 0;
int previousContentType = 0;
public:
void configure(String title, char graphType, double xpos, double ypos, double width, double height,
double yminimum, double ymaximum, double xminimum, double xmaximum, double yStepSize, double xStepSize, double digit){
this->title = title;
this->graphType = graphType;
this->yminimum = yminimum;
this->ymaximum = ymaximum;
this->xminimum = xminimum;
this->count = xminimum;
this->xmaximum = xmaximum;
this->height = height;
this->width = width;
this->yStepSize = yStepSize;
this->xStepSize = xStepSize;
this->digit = digit;
this->xpos = xpos;
this->ypos = ypos;
switch(graphType){
case 'a':
this->yrange = ymaximum - yminimum;
this->graphScale = (yStepSize) * (height / this->yrange) - .001; //Adjusts the scale of the graph, according to the range and the size of the step
break;
case 'b':
this->xrange = xmaximum - xminimum;
this->graphScale = (xStepSize) * (width / this->xrange) - .001; //Adjusts the scale of the graph, according to the range and the size of the step
break;
case 'c':
this->yrange = ymaximum - yminimum;
this->xrange = xmaximum - xminimum;
break;
}
}
void drawGraph(){
double level, data, i;
switch(graphType){
case 'a':
double my;
if (this->redraw) {
display.clearDisplay();
this->redraw = false;
display.fillRect(0, 0, 127 , 14, SSD1306_WHITE);
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);
display.setTextSize(1);
display.setCursor(2, 4);
display.println(this->title);
for (i = 0; i <= this->height; i += this->graphScale) {
my = this->ypos - this->height + i;
display.drawFastHLine(this->xpos + this->width + 1, my, 5, SSD1306_WHITE);
// draw lables
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
display.setCursor(this->xpos + this->width + 12, my - 3 );
data = this->ymaximum - ( i * (this->yStepSize / this->graphScale));
display.print(data, this->digit);
}
}
// compute level of bar graph that is scaled to the height and the hi and low vals
// this is needed to accompdate for +/- range
level = (this->height * (((this->value - this->yminimum) / (this->yrange))));
// draw the bar graph
// write a upper and lower bar to minimize flicker cause by blanking out bar and redraw on update
display.drawRect(this->xpos, this->ypos - this->height, this->width, this->height, SSD1306_WHITE);
display.fillRect(this->xpos, this->ypos - this->height, this->width, this->height - level, SSD1306_BLACK);
display.drawRect(this->xpos, this->ypos - this->height, this->width, this->height, SSD1306_WHITE);
display.fillRect(this->xpos, this->ypos - level, this->width, level, SSD1306_WHITE);
// up until now print sends data to a video buffer NOT the screen
// this call sends the data to the screen
display.display();
break;
case 'b':
if (this->redraw) {
display.clearDisplay();
this->redraw = false;
display.fillRect(0, 0, 127 , 16, SSD1306_WHITE);
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);
display.setTextSize(1);
display.setCursor(2, 4);
display.println(this->title);
// draw the text
for (i = 0; i <= this->width; i += this->graphScale) {
display.drawFastVLine(i + this->xpos , this->ypos , 5, SSD1306_WHITE);
// draw lables
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
display.setCursor(i + this->xpos , this->ypos + 10);
// addling a small value to eliminate round off errors
// this val may need to be adjusted
data = ( i * (this->xStepSize / this->graphScale)) + this->xminimum + 0.00001;
display.print(data, this->digit);
}
}
// compute level of bar graph that is scaled to the width and the hi and low vals
// this is needed to accompdate for +/- range capability
// draw the bar graph
// write a upper and lower bar to minimize flicker cause by blanking out bar and redraw on update
level = (this->width * (((this->value - this->xminimum) / (this->xmaximum - this->xminimum))));
display.fillRect(this->xpos + level, this->ypos - this->height, this->width - level, this->height, SSD1306_BLACK);
display.drawRect(this->xpos, this->ypos - this->height, this->width, this->height, SSD1306_WHITE);
display.fillRect(this->xpos, this->ypos - this->height, level, this->height, SSD1306_WHITE);
// up until now print sends data to a video buffer NOT the screen
// this call sends the data to the screen
display.display();
break;
case 'c':
double temp;
if (this->redraw == true) {
this->redraw = false;
display.clearDisplay();
display.fillRect(0, 0, 127 , 16, SSD1306_WHITE);
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);
display.setTextSize(1);
display.setCursor(2, 4);
display.println(title);
this->ox = (this->count - this->xminimum) * (this->width) / (this->xrange) + this->xpos;
this->oy = (this->value - this->yminimum) * (- this->height) / (this->yrange) + this->ypos;
// draw y scale
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
for ( i = this->yminimum; i <= this->ymaximum; i += this->yStepSize) {
// compute the transform
// note my transform funcition is the same as the map function, except the map uses long and we need doubles
temp = (i - this->yminimum) * (- this->height) / (this->ymaximum - this->yminimum) + this->ypos;
if (i == 0) {
display.drawFastHLine(this->xpos - 3, temp, this->width + 3, SSD1306_WHITE);
}
else {
display.drawFastHLine(this->xpos - 3, temp, 3, SSD1306_WHITE);
}
display.setCursor(this->xpos - 27, temp - 3);
display.println(i, this->digit);
}
// draw x scale
for (i = this->xminimum; i <= this->xmaximum; i += this->xStepSize) {
// compute the transform
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
temp = (i - this->xminimum) * (this->width) / (this->xrange) + this->xpos;
if (i == 0) {
display.drawFastVLine(temp, this->ypos - this->height, this->height + 3, SSD1306_WHITE);
}
else {
display.drawFastVLine(temp, this->ypos, 3, SSD1306_WHITE);
}
display.setCursor(temp, this->ypos + 6);
display.println(i, this->digit);
}
}
// graph drawn now plot the data
// the entire plotting code are these few lines...
this->x = (this->count - this->xminimum) * (this->width) / (this->xrange) + this->xpos;
this->value = (this->value - this->yminimum) * (- this->height) / (this->yrange) + this->ypos;
display.drawLine(this->ox, this->oy, this->x, this->value, SSD1306_WHITE);
display.drawLine(this->ox, this->oy - 1, this->x, this->value - 1, SSD1306_WHITE);
this->ox = this->x;
this->oy = this->value;
// up until now print sends data to a video buffer NOT the screen
// this call sends the data to the screen
display.display();
this->count += 1;
if(this->ox >= (this->xpos + this->width)){
this->redraw = true;
this->count = xminimum;
}
}
}
void redrawFlag(){
this->redraw = true;
}
void setPreviousScreen(int prev){
this->previousScreen = prev;
}
void setPreviousContentType(int prev){
this->previousContentType = prev;
}
int getPreviousScreen(){
int prev = this->previousScreen;
return prev;
}
int getPreviousContentType(){
int prev = this->previousContentType;
return prev;
}
void assignValue(double value){
this->value = value;
}
void reset(){
this->x = 0;
}
};
class Screen{
private:
Menu menu[MAX_MENUS];
Graph graph[MAX_GRAPH];
int counterM = 0;
int counterG = 0;
bool redraw = true;
int currentScreen = 0;
int contentType = 0;
public:
void configure(bool fullsetting){
if(fullsetting){
//Adafruit_SSD1306 display(DISP_WIDTH, DISP_HEIGHT, &Wire, -1);
Serial.begin(115200);
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
#ifdef __DEBUG__
Serial.println("Display not found!");
#endif
while (true);
}
}
display.clearDisplay();
// Text size
display.setTextSize(2);
// Text color
display.setTextColor(SSD1306_WHITE);
// Text position
display.setCursor(25, 20);
display.println("Welcome");
display.setTextSize(1);
display.display();
delay(5000);
}
void createMenu(int sizex, int sizey){
this->menu[counterM].configure(sizex, sizey);
this->counterM++;
}
void createOption(int menuIndex, String content, bool destinationTypeMenu, int destinationIndex){
this->menu[menuIndex].createOption(content, destinationTypeMenu, destinationIndex);
}
void createVGraph(String title, double xpos, double ypos, double width, double height,
double yminimum, double ymaximum, double yStepSize, double digit){
this->graph[counterG].configure(title, 'a', xpos, ypos, width, height, yminimum, ymaximum, 0, 0, yStepSize, 0, digit);
this->counterG++;
}
void createHGraph(String title, double xpos, double ypos, double width, double height,
double xminimum, double xmaximum, double xStepSize, double digit){
this->graph[counterG].configure(title, 'b', xpos, ypos, width, height, 0, 0, xminimum, xmaximum, 0, xStepSize, digit);
counterG++;
}
void createCGraph(String title, double xpos, double ypos, double width, double height,
double yminimum, double ymaximum, double xminimum, double xmaximum, double yStepSize, double xStepSize, double digit){
this->graph[counterG].configure(title, 'c', xpos, ypos, width, height, yminimum, ymaximum, xminimum, xmaximum, yStepSize, xStepSize, digit);
counterG++;
}
/*
void redrawFlag(){
this->redraw = true;
}
*/
void graphAssignValue(int graphIndex, double value){
this->graph[graphIndex].assignValue(value);
this->redraw = true;
}
void control(){
if (redraw){
if (contentType == 0){
menu[currentScreen].drawMenu();
}
else if (contentType == 1){
graph[currentScreen].drawGraph();
}
this->redraw = false;
}
}
void increasePos(){
if(this->menu[this->currentScreen].extractPos() < this->menu[this->currentScreen].extractOptNumber() - 1)
this->menu[this->currentScreen].increasePos();
}
void decreasePos(){
if(this->menu[this->currentScreen].extractPos() > 0)
this->menu[this->currentScreen].decreasePos();
}
void goTo(){
if(this->contentType == 0){
int newScreen = this->menu[this->currentScreen].extractDestinationIndex();
int newContentType = this->menu[this->currentScreen].extractDestinationType();
if (newContentType == 0){
this->menu[newScreen].setPreviousScreen(this->currentScreen);
this->menu[newScreen].setPreviousContentType(this->contentType);
}
else if(newContentType == 1){
this->graph[newScreen].setPreviousScreen(this->currentScreen);
this->graph[newScreen].setPreviousContentType(this->contentType);
this->graph[newScreen].reset();
this->graph[newScreen].redrawFlag();
}
else if(newContentType == 2){
}
this->contentType = newContentType;
this->currentScreen = newScreen;
this->redraw = true;
}
}
void goBack(){
if(contentType == 0){
//Gets indexes from previous screen saved in actual screen if it is a menu, and sets them as the current indexes
this->currentScreen = this->menu[this->currentScreen].getPreviousScreen();
this->contentType = this->menu[this->currentScreen].getPreviousContentType();
}
else if(contentType == 1){
//Gets indexes from previous screen saved in actual screen if it is a graph, and sets them as the current indexes
this->currentScreen = this->graph[this->currentScreen].getPreviousScreen();
this->contentType = this->graph[this->currentScreen].getPreviousContentType();
}
}
void plusAction(){
if(contentType == 0){
increasePos();
}
}
void minusAction(){
if(contentType == 0){
decreasePos();
}
}
};
class Keyboard{
private:
byte goTo;
byte goBack;
byte plus;
byte minus;
byte debounceTime;
Screen *screen;
public:
Keyboard(byte goTo, byte goBack, byte plus, byte minus, byte debounceTime, Screen * screen){
this->goTo = goTo;
this->goBack = goBack;
this->plus = plus;
this->minus = minus;
this->debounceTime = debounceTime;
this->screen = screen;
pinMode(goTo, INPUT_PULLUP);
pinMode(goBack, INPUT_PULLUP);
pinMode(plus, INPUT_PULLUP);
pinMode(minus, INPUT_PULLUP);
}
void checkGoTo(){
static char cont;
if(digitalRead(this->goTo) == LOW)
cont++;
else
cont = 0;
if(cont == debounceTime/REFRESH){
cont = 0;
this->screen->goTo();
while(digitalRead(this->goTo) == LOW){
}
}
}
void checkGoBack(){
static char cont;
if(digitalRead(this->goBack) == LOW){
cont++;
}
else
cont = 0;
if(cont == debounceTime/REFRESH){
cont = 0;
this->screen->goBack();
while(digitalRead(this->goBack) == LOW){
}
}
}
void checkPlus(){
static char cont;
if(digitalRead(this->plus) == LOW)
cont++;
else
cont = 0;
if(cont == debounceTime/REFRESH){
cont = 0;
this->screen->plusAction();
while(digitalRead(this->plus) == LOW){
}
}
}
void checkMinus(){
static char cont;
if(digitalRead(this->minus) == LOW)
cont++;
else
cont = 0;
if(cont == debounceTime/REFRESH){
cont = 0;
this->screen->minusAction();
while(digitalRead(this->minus) == LOW){
}
}
}
void control(){
this->checkGoTo();
this->checkGoBack();
this->checkPlus();
this->checkMinus();
}
};
Screen screen;
Keyboard keyboard(13, 12, 14, 27, 30, &screen);
void setup(){
screen.configure(true);
screen.createMenu(128, 13); //Menu 0
screen.createMenu(128, 13); //Menu 1
/*String title, char graphType, double xpos, double ypos, double width, double height,
double yminimum, double ymaximum, double xminimum, double xmaximum, double yStepSize, double xStepSize, double digit*/
screen.createVGraph("Grafica 1", 25, 60, 40, 40, 0, 100, 10, 0); //Graph 0
screen.createHGraph("Grafica 2", 10, 40, 100, 20, 0, 100, 10, 0); //Graph 1
screen.createCGraph("Grafica 3", 30, 50, 75, 30, 0, 100, 0, 1000, 25, 250, 0); //Graph 2
screen.createOption(0, "Vertical graph", 1, 0);
//Creates the first option in Menu 0, directing to a graph (contentType = 1 (Graph)), 0 (Graph 0)
screen.createOption(0, "Horizontal graph", 1, 1);
screen.createOption(0, "Cartesian graph", 1, 2);
screen.createOption(0, "Extra option", 0, 1);
screen.createOption(1, "Test", 1, 3);
screen.createOption(1, "Working?", 1, 4);
// screen.increasePos();
// screen.increasePos();
// screen.goTo();
// screen.graphAssignValue(2, 50);
// screen.goBack();
// screen.increasePos();
// screen.goTo();
// screen.goBack();
// screen.decreasePos();
}
void loop(){
screen.control(); //Controls the screen and redraws if needed
keyboard.control();
if(i <= 100){
screen.graphAssignValue(1, i); //Assigning a demo value to Graph 1
screen.graphAssignValue(2, i); //Assigning a demo value to Graph 2
i++;
}
else
i = 0;
delay(REFRESH); //Refresh time (approx)
}