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Reprap Discount Full Graphics 128×64 LCD Test Sketch

Using Arduino Mega & Ramps

Using the following Arduino ino codes you can test your 12864 type Reprap Discount Full Graphics 128x64 LCD. Codes are written for Arduino Mega and Ramps combo pins. However it can be converted to any 3D printer mainboard (ie SKR).

Copy and paste the following codes into a text file and give a name like ReprapLCDTest.ino (or just  click here to download) and then open with Arduino IDE and run it.

#include <SPI.h>
#include <U8glib.h>
#include <SD.h>

//Lets you test the standard features of a reprap discount full graphics 128x64 LCD
//Test STOP and Encoder button
//Test buzzer (Hold both STOP and Encoder buttons to activate)
//Test SD detect, disply SD card information
//Test Encode left/right
//Verify the LCD is working.

//Standard pins when on a RAMPS 1.4

#define DOGLCD_CS       16
#define DOGLCD_MOSI     17
#define DOGLCD_SCK      23
#define BTN_EN1         31
#define BTN_EN2         33
#define BTN_ENC         35
#define SD_DETECT_PIN   49
#define SDSS            53
#define BEEPER_PIN      37
#define KILL_PIN        41

Sd2Card card;
SdVolume volume;

int x=0;                                //Offset postion of title  
int kill_pin_status = 1;                //Last read status of the stop pin, start at 1 to ensure buzzer is off
int encoderPos = 1;                     //Current encoder position
int encoder0PinALast;                   //Used to decode rotory encoder, last value
int encoder0PinNow;                     //Used to decode rotory encoder, current value
char posStr[4];                         //Char array to store encoderPos as a string  
char tmp_string[16];
int enc_pin_status;                     //Last read status of the encoder button
int sd_detect_pin_status = true;               //Last read status of the SD detect pin
int scroll_direction=1;                 //Direction of title scroll, 1 right, -1 left
unsigned long previousMillis = 0;       //Previous Millis value
unsigned long currentMillis;            //Current Millis value
const long interval = 1000/3;           //How often to run the display loop, every 1/3 of a second aproximatly 
boolean gotsddata = false;

int sdcardinit;
int sdcardtype;
int sdvolumeinit;
int sdvolumefattype;
unsigned long sdvolumebpc;
unsigned long sdvolumecc;

// SPI Com: SCK = en = 23, MOSI = rw = 17, CS = di = 16

void setup() {  
  pinMode(SD_DETECT_PIN, INPUT);        // Set SD_DETECT_PIN as an unput
  digitalWrite(SD_DETECT_PIN, HIGH);    // turn on pullup resistors
  pinMode(KILL_PIN, INPUT);             // Set KILL_PIN as an unput
  digitalWrite(KILL_PIN, HIGH);         // turn on pullup resistors
  pinMode(BTN_EN1, INPUT);              // Set BTN_EN1 as an unput, half of the encoder
  digitalWrite(BTN_EN1, HIGH);          // turn on pullup resistors
  pinMode(BTN_EN2, INPUT);              // Set BTN_EN2 as an unput, second half of the encoder
  digitalWrite(BTN_EN2, HIGH);          // turn on pullup resistors
  pinMode(BTN_ENC, INPUT);              // Set BTN_ENC as an unput, encoder button
  digitalWrite(BTN_ENC, HIGH);          // turn on pullup resistors
  u8g.setFont(u8g_font_helvR08);        //Set the font for the display
  u8g.setColorIndex(1);                 // Instructs the display to draw with a pixel on. 

//Main arduino loop
void loop() {
  // Read the encoder and update encoderPos    
  encoder0PinNow = digitalRead(BTN_EN1);
  if ((encoder0PinALast == LOW) && (encoder0PinNow == HIGH)) {
    if (digitalRead(BTN_EN2) == LOW) {
    } else {
  encoder0PinALast = encoder0PinNow;

  //read in SD data when SD is incerted
  if (!sd_detect_pin_status && !gotsddata) {
      sdcardinit = card.init(SPI_HALF_SPEED, SDSS);
      sdcardtype = card.type();
      sdvolumeinit = volume.init(card);
      sdvolumefattype = volume.fatType();
      sdvolumebpc = volume.blocksPerCluster();
      sdvolumecc = volume.clusterCount();
      gotsddata = true;

  //check if it is time to update the display 
  currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    //read the kill pin status
    kill_pin_status = digitalRead(KILL_PIN); 
    //read the encoder button status
    enc_pin_status = digitalRead(BTN_ENC);
    //read the SD detect pin status  
    sd_detect_pin_status = digitalRead(SD_DETECT_PIN);
    if (sd_detect_pin_status) {
      gotsddata = false;
    //Check if both Kill switch and encoder are pressed, if so switch on buzzer
    if(kill_pin_status || enc_pin_status) digitalWrite(BEEPER_PIN, LOW); 
    else digitalWrite(BEEPER_PIN, HIGH);

    //Draw new screen
    do {  
      if(gotsddata) draw2();
      else draw();
    } while( u8g.nextPage() );

    //Update Title position
    if (x > 40) scroll_direction = -1;
    if (x < 1) scroll_direction = 1;

//Assemble the display  
void draw(){
  u8g.drawStr( 2+x, 10, "RRD GLCD TEST");
  u8g.drawStr( 2, 3*9, "Stop pin status:");
  if (kill_pin_status) u8g.drawStr( 84, 3*9, "Open");
  else u8g.drawStr( 84, 3*9, "Closed");

  u8g.drawStr( 2, 4*9, "Enc pin status:");
  if (enc_pin_status) u8g.drawStr( 84, 4*9, "Open");
  else u8g.drawStr( 84, 4*9, "Closed");

  u8g.drawStr( 2, 6*9, "Encoder value:");
  sprintf (posStr, "%d", encoderPos);
  u8g.drawStr( 84, 6*9, posStr );
  u8g.drawStr( 2, 5*9, "SD detect status:");
  if (sd_detect_pin_status) u8g.drawStr( 84, 5*9, "Open");
  else u8g.drawStr( 84, 5*9, "Closed");
  u8g.drawStr( 2, 7*9, "Buzzer:");
  if (kill_pin_status || enc_pin_status) u8g.drawStr( 84, 7*9, "Off");
  else u8g.drawStr( 84, 7*9, "On");


//Display SD card info
void draw2(){
  u8g.drawStr( 0, 1*10, "Initializing SD card:");
  if (sdcardinit) {
      u8g.drawStr( 90, 1*10, "OK");
      u8g.drawStr( 0, 2*10, "Card type:");
      switch (sdcardtype) {
        case SD_CARD_TYPE_SD1:
          u8g.drawStr( 90, 2*10, "SD1");
        case SD_CARD_TYPE_SD2:
          u8g.drawStr( 90, 2*10, "SD2");
        case SD_CARD_TYPE_SDHC:
          u8g.drawStr( 90, 2*10, "SDHC");
          u8g.drawStr( 90, 2*10, "Unknown");
      if (!sdvolumeinit) {
        u8g.drawStr( 0, 3*10, "No FAT16/FAT32 partition.");
      } else {

        // print the type and size of the first FAT-type volume
        u8g.drawStr( 0, 3*10,"Volume type is:       FAT");
        itoa(sdvolumefattype, tmp_string, 10);
        u8g.drawStr( 110, 3*10,tmp_string);

        uint32_t volumesize;
        volumesize = sdvolumebpc;    // clusters are collections of blocks
        volumesize *= sdvolumecc;       // we'll have a lot of clusters
        volumesize /= 2;                           // SD card blocks are always 512 bytes (2 blocks are 1KB)
        volumesize /= 1024;
        u8g.drawStr( 0, 4*10,"Volume size (Mb):");
        itoa(volumesize, tmp_string, 10);
        u8g.drawStr( 90, 4*10,tmp_string);
  } else {
      u8g.drawStr( 90, 1*10, "FAILED");
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