Velleman VMA412 2.8" serial LCD display code for Photon

Michele · February 7, 2018, 7:47pm

I got this cute little serial color LCD display from Velleman and now I’m trying to compile the Arduino example that came with it for the Photon. Naturally it’s not working and I’m at a loss. Could some kind soul please get this to compile before I pull out what little hair I have left? Many thanks.

//Technical support:support@openplatform.cc
// Breakout/Arduino UNO pin usage:
// LCD Data Bit :   7   6   5   4   3   2   1   0
// Uno dig. pin :   7   6   5   4   3   2   9   8
// Uno port/pin : PD7 PD6 PD5 PD4 PD3 PD2 PB1 PB0
// Mega dig. pin:  29  28  27  26  25  24  23  22
#define LCD_RD   A0
#define LCD_WR   A1     
#define LCD_RS   A2        
#define LCD_CS   A3       
#define LCD_REST A4

void setup()
{
  for(int p=0;p<10;p++)
  {
    pinMode(p,OUTPUT);
  }
  pinMode(A0,OUTPUT);
  pinMode(A1,OUTPUT);
  pinMode(A2,OUTPUT);
  pinMode(A3,OUTPUT);
  pinMode(A4,OUTPUT);
  digitalWrite(A0, HIGH);
  digitalWrite(A1, HIGH);
  digitalWrite(A2, HIGH);
  digitalWrite(A3, HIGH);
  digitalWrite(A4, HIGH);
  Lcd_Init();
 //LCD_Clear(0xf800);
}

void loop()
{  
   LCD_Clear(0xffff);
   LCD_Clear(0x0000);
   LCD_Clear(0xf800);
   LCD_Clear(0x07E0);
   LCD_Clear(0x001F);
  /*   
  for(int i=0;i<1000;i++)
  {
    Rect(random(300),random(300),random(300),random(300),random(65535)); // rectangle at x, y, with, hight, color
  }*/
  
//  LCD_Clear(0xf800);
}

void Lcd_Writ_Bus(unsigned char d)
{
 PORTD = (PORTD & B00000011) | ((d) & B11111100); 
 PORTB = (PORTB & B11111100) | ((d) & B00000011); 
 *(portOutputRegister(digitalPinToPort(LCD_WR))) &=  ~digitalPinToBitMask(LCD_WR);
 *(portOutputRegister(digitalPinToPort(LCD_WR)))|=  digitalPinToBitMask(LCD_WR);
}


void Lcd_Write_Com(unsigned char VH)  
{   
  *(portOutputRegister(digitalPinToPort(LCD_RS))) &=  ~digitalPinToBitMask(LCD_RS);//LCD_RS=0;
  Lcd_Writ_Bus(VH);
}

void Lcd_Write_Data(unsigned char VH)
{
  *(portOutputRegister(digitalPinToPort(LCD_RS)))|=  digitalPinToBitMask(LCD_RS);//LCD_RS=1;
  Lcd_Writ_Bus(VH);
}
void Lcd_Write_Data_16(unsigned int dat)
{
  *(portOutputRegister(digitalPinToPort(LCD_RS)))|=  digitalPinToBitMask(LCD_RS);//LCD_RS=1;
  Lcd_Writ_Bus(dat>>8);
  Lcd_Writ_Bus(dat);
}

void Lcd_Write_Com_Data(unsigned char com,unsigned char dat)
{
  Lcd_Write_Com(com);
  Lcd_Write_Data(dat);
}
void LCD_WriteReg(unsigned char com,unsigned int dat)
{
  Lcd_Write_Com(com);
  Lcd_Write_Data_16(dat);
 }
void Address_set(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2)
{
  Lcd_Write_Com(0x50);
    Lcd_Write_Data_16(x1);
  
  Lcd_Write_Com(0x51);
    Lcd_Write_Data_16(x2);
        
  Lcd_Write_Com(0x52);
    Lcd_Write_Data_16(y1);
  
    Lcd_Write_Com(0x53);
    Lcd_Write_Data_16(y2);

   Lcd_Write_Com(0x20);
  Lcd_Write_Data_16(x1);
  
  Lcd_Write_Com(0x21);
  Lcd_Write_Data_16(y1);
    Lcd_Write_Com(0x22);                              
}

void Lcd_Init(void)
{
  digitalWrite(LCD_REST,HIGH);
  delay(50); 
  digitalWrite(LCD_REST,LOW);
  delay(150);
  digitalWrite(LCD_REST,HIGH);
  delay(150);

  digitalWrite(LCD_CS,HIGH);
  digitalWrite(LCD_WR,HIGH);
  digitalWrite(LCD_CS,LOW);  //CS

  LCD_WriteReg(0x0000,0x0001);
  delay(100); //at least 100ms
  LCD_WriteReg( 0x0001,0x0100); // set SS and SM bit
  LCD_WriteReg(0x0010,0x1790);
  LCD_WriteReg(0x0060,0xA700);
  LCD_WriteReg(0x0061,0x0001);
  LCD_WriteReg( 0x0046,0x0002);
  LCD_WriteReg(0x0013,0x8010);
  LCD_WriteReg(0x0012,0x80fe);
  LCD_WriteReg(0x0002,0x0500);
  LCD_WriteReg(0x0003,0x1030);
  
  LCD_WriteReg(0x0030,0x0303);
  LCD_WriteReg(0x0031,0x0303);
  LCD_WriteReg(0x0032,0x0303);
  LCD_WriteReg(0x0033,0x0300);
  LCD_WriteReg(0x0034,0x0003);
  LCD_WriteReg(0x0035,0x0303);
  LCD_WriteReg(0x0036,0x0014);
  LCD_WriteReg(0x0037,0x0303);
  LCD_WriteReg(0x0038,0x0303);
  LCD_WriteReg(0x0039,0x0303);
  LCD_WriteReg(0x003a,0x0300);
  LCD_WriteReg(0x003b,0x0003);
  LCD_WriteReg(0x003c,0x0303);
  LCD_WriteReg(0x003d,0x1400);
  
  LCD_WriteReg(0x0092,0x0200);
  LCD_WriteReg(0x0093,0x0303);
  LCD_WriteReg(0x0090,0x080d);
  
  
  LCD_WriteReg(0x0001, 0x0100); // set SS and SM bit 0100
  LCD_WriteReg( 0x0002, 0x0700); // set 1 line inversion
  LCD_WriteReg(0x0003, 0x1030); // set GRAM write direction and BGR=1.
  LCD_WriteReg(0x0004, 0x0000); // Resize register
  LCD_WriteReg(0x0008, 0x0302); // set the back porch and front porch
  LCD_WriteReg(0x0009, 0x0000); // set non-display area refresh cycle ISC[3:0]
  LCD_WriteReg(0x000A, 0x0000);// FMARK function
  LCD_WriteReg(0x000C, 0x0000); // RGB interface setting
  LCD_WriteReg(0x000D, 0x0000); // Frame marker Position
  LCD_WriteReg(0x000F, 0x0000); // RGB interface polarity
  delay(120);
  
  LCD_WriteReg(0x0030,0x0303);
  LCD_WriteReg(0x0031,0x0303);
  LCD_WriteReg(0x0032,0x0303);
  LCD_WriteReg( 0x0033,0x0300);
  LCD_WriteReg(0x0034,0x0003);
  LCD_WriteReg(0x0035,0x0303);
  LCD_WriteReg(0x0036,0x0014);
  LCD_WriteReg(0x0037,0x0303);
  LCD_WriteReg(0x0038,0x0303);
  LCD_WriteReg(0x0039,0x0303);
  LCD_WriteReg(0x003a,0x0300);
  LCD_WriteReg(0x003b,0x0003);
  LCD_WriteReg(0x003c,0x0303);
  LCD_WriteReg(0x003d,0x1400);
  
  LCD_WriteReg(0x0060, 0xA700); // Gate Scan 
  LCD_WriteReg(0x0061, 0x0001); // NDL,VLE, REV
  LCD_WriteReg( 0x006A, 0x0000); // set scrolling line
  LCD_WriteReg(0x0090, 0x0033);
  LCD_WriteReg(0x0095, 0x0110);
  
  LCD_WriteReg(0x00FF, 0x0001);
  LCD_WriteReg(0x00FF, 0x000C);
  LCD_WriteReg(0x00FF, 0x0000);
  delay(100);
  LCD_WriteReg(0x0003,0x1030); // set GRAM write direction and BGR=1.
  LCD_WriteReg(0x0007,0x0173);
  
  delay(50);         
  
}

void H_line(unsigned int x, unsigned int y, unsigned int l, unsigned int c)                   
{    
  unsigned int i,j;
  Lcd_Write_Com(0x02c); //write_memory_start
  digitalWrite(LCD_RS,HIGH);
  digitalWrite(LCD_CS,LOW);
  l=l+x;
  Address_set(x,y,l,y);
  j=l*2;
  for(i=1;i<=j;i++)
  {
    Lcd_Write_Data(c);
  }
  digitalWrite(LCD_CS,HIGH);   
}

void V_line(unsigned int x, unsigned int y, unsigned int l, unsigned int c)                   
{    
  unsigned int i,j;
  Lcd_Write_Com(0x02c); //write_memory_start
  digitalWrite(LCD_RS,HIGH);
  digitalWrite(LCD_CS,LOW);
  l=l+y;
  Address_set(x,y,x,l);
  j=l*2;
  for(i=1;i<=j;i++)
  { 
    Lcd_Write_Data(c);
  }
  digitalWrite(LCD_CS,HIGH);   
}

void Rect(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c)
{
  H_line(x  , y  , w, c);
  H_line(x  , y+h, w, c);
  V_line(x  , y  , h, c);
  V_line(x+w, y  , h, c);
}

void Rectf(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c)
{
  unsigned int i;
  for(i=0;i<h;i++)
  {
    H_line(x  , y  , w, c);
    H_line(x  , y+i, w, c);
  }
}
int RGB(int r,int g,int b)
{return r << 16 | g << 8 | b;
}
void LCD_Clear(unsigned int j)                   
{    
  unsigned int i,m;
 Address_set(0,0,240-1,320-1);
  //Lcd_Write_Com(0x02c); //write_memory_start
  //digitalWrite(LCD_RS,HIGH);
  digitalWrite(LCD_CS,LOW);


  for(i=0;i<320;i++)
    for(m=0;m<240;m++)
    {
      Lcd_Write_Data(j>>8);
      Lcd_Write_Data(j);

    }
  digitalWrite(LCD_CS,HIGH);   
}

joost · February 9, 2018, 3:47am

This compiles:

#include <Arduino.h>

//Technical support:support@openplatform.cc
// Breakout/Arduino UNO pin usage:
// LCD Data Bit :   7   6   5   4   3   2   1   0
// Uno dig. pin :   7   6   5   4   3   2   9   8
// Uno port/pin : PD7 PD6 PD5 PD4 PD3 PD2 PB1 PB0
// Mega dig. pin:  29  28  27  26  25  24  23  22
#define LCD_RD   A0
#define LCD_WR   A1     
#define LCD_RS   A2        
#define LCD_CS   A3       
#define LCD_REST A4

// forward declarations
void LCD_Clear(unsigned int j);
void Lcd_Writ_Bus(unsigned char d);
void Lcd_Write_Data(unsigned char VH);
void Lcd_Write_Data_16(unsigned int dat);
void Lcd_Write_Com_Data(unsigned char com,unsigned char dat);
void LCD_WriteReg(unsigned char com,unsigned int dat);
void Address_set(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2);
void Lcd_Init(void);
void H_line(unsigned int x, unsigned int y, unsigned int l, unsigned int c);
void V_line(unsigned int x, unsigned int y, unsigned int l, unsigned int c);
void Rect(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c);
void Rectf(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c);
void LCD_Clear(unsigned int j);

void setup()
{
  for(int p=0;p<10;p++)
  {
    pinMode(p,OUTPUT);
  }
  pinMode(A0,OUTPUT);
  pinMode(A1,OUTPUT);
  pinMode(A2,OUTPUT);
  pinMode(A3,OUTPUT);
  pinMode(A4,OUTPUT);
  digitalWrite(A0, HIGH);
  digitalWrite(A1, HIGH);
  digitalWrite(A2, HIGH);
  digitalWrite(A3, HIGH);
  digitalWrite(A4, HIGH);
  Lcd_Init();
 //LCD_Clear(0xf800);
}

void loop()
{  
   LCD_Clear(0xffff);
   LCD_Clear(0x0000);
   LCD_Clear(0xf800);
   LCD_Clear(0x07E0);
   LCD_Clear(0x001F);
  /*   
  for(int i=0;i<1000;i++)
  {
    Rect(random(300),random(300),random(300),random(300),random(65535)); // rectangle at x, y, with, hight, color
  }*/
  
//  LCD_Clear(0xf800);
}

void Lcd_Writ_Bus(unsigned char d)
{
 //PORTD = (PORTD & B00000011) | ((d) & 0b11111100); 
 //PORTB = (PORTB & B11111100) | ((d) & 0b00000011); 
 *(portOutputRegister(digitalPinToPort(LCD_WR))) &=  ~digitalPinToBitMask(LCD_WR);
 *(portOutputRegister(digitalPinToPort(LCD_WR)))|=  digitalPinToBitMask(LCD_WR);
}


void Lcd_Write_Com(unsigned char VH)  
{   
  *(portOutputRegister(digitalPinToPort(LCD_RS))) &=  ~digitalPinToBitMask(LCD_RS);//LCD_RS=0;
  Lcd_Writ_Bus(VH);
}

void Lcd_Write_Data(unsigned char VH)
{
  *(portOutputRegister(digitalPinToPort(LCD_RS)))|=  digitalPinToBitMask(LCD_RS);//LCD_RS=1;
  Lcd_Writ_Bus(VH);
}
void Lcd_Write_Data_16(unsigned int dat)
{
  *(portOutputRegister(digitalPinToPort(LCD_RS)))|=  digitalPinToBitMask(LCD_RS);//LCD_RS=1;
  Lcd_Writ_Bus(dat>>8);
  Lcd_Writ_Bus(dat);
}

void Lcd_Write_Com_Data(unsigned char com,unsigned char dat)
{
  Lcd_Write_Com(com);
  Lcd_Write_Data(dat);
}
void LCD_WriteReg(unsigned char com,unsigned int dat)
{
  Lcd_Write_Com(com);
  Lcd_Write_Data_16(dat);
 }
void Address_set(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2)
{
  Lcd_Write_Com(0x50);
    Lcd_Write_Data_16(x1);
  
  Lcd_Write_Com(0x51);
    Lcd_Write_Data_16(x2);
        
  Lcd_Write_Com(0x52);
    Lcd_Write_Data_16(y1);
  
    Lcd_Write_Com(0x53);
    Lcd_Write_Data_16(y2);

   Lcd_Write_Com(0x20);
  Lcd_Write_Data_16(x1);
  
  Lcd_Write_Com(0x21);
  Lcd_Write_Data_16(y1);
    Lcd_Write_Com(0x22);                              
}

void Lcd_Init(void)
{
  digitalWrite(LCD_REST,HIGH);
  delay(50); 
  digitalWrite(LCD_REST,LOW);
  delay(150);
  digitalWrite(LCD_REST,HIGH);
  delay(150);

  digitalWrite(LCD_CS,HIGH);
  digitalWrite(LCD_WR,HIGH);
  digitalWrite(LCD_CS,LOW);  //CS

  LCD_WriteReg(0x0000,0x0001);
  delay(100); //at least 100ms
  LCD_WriteReg( 0x0001,0x0100); // set SS and SM bit
  LCD_WriteReg(0x0010,0x1790);
  LCD_WriteReg(0x0060,0xA700);
  LCD_WriteReg(0x0061,0x0001);
  LCD_WriteReg( 0x0046,0x0002);
  LCD_WriteReg(0x0013,0x8010);
  LCD_WriteReg(0x0012,0x80fe);
  LCD_WriteReg(0x0002,0x0500);
  LCD_WriteReg(0x0003,0x1030);
  
  LCD_WriteReg(0x0030,0x0303);
  LCD_WriteReg(0x0031,0x0303);
  LCD_WriteReg(0x0032,0x0303);
  LCD_WriteReg(0x0033,0x0300);
  LCD_WriteReg(0x0034,0x0003);
  LCD_WriteReg(0x0035,0x0303);
  LCD_WriteReg(0x0036,0x0014);
  LCD_WriteReg(0x0037,0x0303);
  LCD_WriteReg(0x0038,0x0303);
  LCD_WriteReg(0x0039,0x0303);
  LCD_WriteReg(0x003a,0x0300);
  LCD_WriteReg(0x003b,0x0003);
  LCD_WriteReg(0x003c,0x0303);
  LCD_WriteReg(0x003d,0x1400);
  
  LCD_WriteReg(0x0092,0x0200);
  LCD_WriteReg(0x0093,0x0303);
  LCD_WriteReg(0x0090,0x080d);
  
  
  LCD_WriteReg(0x0001, 0x0100); // set SS and SM bit 0100
  LCD_WriteReg( 0x0002, 0x0700); // set 1 line inversion
  LCD_WriteReg(0x0003, 0x1030); // set GRAM write direction and BGR=1.
  LCD_WriteReg(0x0004, 0x0000); // Resize register
  LCD_WriteReg(0x0008, 0x0302); // set the back porch and front porch
  LCD_WriteReg(0x0009, 0x0000); // set non-display area refresh cycle ISC[3:0]
  LCD_WriteReg(0x000A, 0x0000);// FMARK function
  LCD_WriteReg(0x000C, 0x0000); // RGB interface setting
  LCD_WriteReg(0x000D, 0x0000); // Frame marker Position
  LCD_WriteReg(0x000F, 0x0000); // RGB interface polarity
  delay(120);
  
  LCD_WriteReg(0x0030,0x0303);
  LCD_WriteReg(0x0031,0x0303);
  LCD_WriteReg(0x0032,0x0303);
  LCD_WriteReg( 0x0033,0x0300);
  LCD_WriteReg(0x0034,0x0003);
  LCD_WriteReg(0x0035,0x0303);
  LCD_WriteReg(0x0036,0x0014);
  LCD_WriteReg(0x0037,0x0303);
  LCD_WriteReg(0x0038,0x0303);
  LCD_WriteReg(0x0039,0x0303);
  LCD_WriteReg(0x003a,0x0300);
  LCD_WriteReg(0x003b,0x0003);
  LCD_WriteReg(0x003c,0x0303);
  LCD_WriteReg(0x003d,0x1400);
  
  LCD_WriteReg(0x0060, 0xA700); // Gate Scan 
  LCD_WriteReg(0x0061, 0x0001); // NDL,VLE, REV
  LCD_WriteReg( 0x006A, 0x0000); // set scrolling line
  LCD_WriteReg(0x0090, 0x0033);
  LCD_WriteReg(0x0095, 0x0110);
  
  LCD_WriteReg(0x00FF, 0x0001);
  LCD_WriteReg(0x00FF, 0x000C);
  LCD_WriteReg(0x00FF, 0x0000);
  delay(100);
  LCD_WriteReg(0x0003,0x1030); // set GRAM write direction and BGR=1.
  LCD_WriteReg(0x0007,0x0173);
  
  delay(50);         
  
}

void H_line(unsigned int x, unsigned int y, unsigned int l, unsigned int c)                   
{    
  unsigned int i,j;
  Lcd_Write_Com(0x02c); //write_memory_start
  digitalWrite(LCD_RS,HIGH);
  digitalWrite(LCD_CS,LOW);
  l=l+x;
  Address_set(x,y,l,y);
  j=l*2;
  for(i=1;i<=j;i++)
  {
    Lcd_Write_Data(c);
  }
  digitalWrite(LCD_CS,HIGH);   
}

void V_line(unsigned int x, unsigned int y, unsigned int l, unsigned int c)                   
{    
  unsigned int i,j;
  Lcd_Write_Com(0x02c); //write_memory_start
  digitalWrite(LCD_RS,HIGH);
  digitalWrite(LCD_CS,LOW);
  l=l+y;
  Address_set(x,y,x,l);
  j=l*2;
  for(i=1;i<=j;i++)
  { 
    Lcd_Write_Data(c);
  }
  digitalWrite(LCD_CS,HIGH);   
}

void Rect(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c)
{
  H_line(x  , y  , w, c);
  H_line(x  , y+h, w, c);
  V_line(x  , y  , h, c);
  V_line(x+w, y  , h, c);
}

void Rectf(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c)
{
  unsigned int i;
  for(i=0;i<h;i++)
  {
    H_line(x  , y  , w, c);
    H_line(x  , y+i, w, c);
  }
}

void LCD_Clear(unsigned int j)                   
{    
  unsigned int i,m;
 Address_set(0,0,240-1,320-1);
  //Lcd_Write_Com(0x02c); //write_memory_start
  //digitalWrite(LCD_RS,HIGH);
  digitalWrite(LCD_CS,LOW);


  for(i=0;i<320;i++)
    for(m=0;m<240;m++)
    {
      Lcd_Write_Data(j>>8);
      Lcd_Write_Data(j);

    }
  digitalWrite(LCD_CS,HIGH);   
}

Changes I made:

include Arduino.h for the digitalPinToPort(), digitalPinToBitMask() etc. methods
removed RGB() method; it was not used and clashed with a system definition. If you need this method, rename it to something else.
Commented out lines 68 & 69; PORTD and PORTB assignments. These have no meaning in the Particle device - this you will have to map from the arduino port B and D to the specific pins you are using on the Particle device. You would do this through digitalWrite() which sets an individual pin. This may change your logic a bit.

So I don’t suggest/expect this code to run but … it compiles and that’s what you were asking… Hope this helps

Michele · February 10, 2018, 5:06pm

That’s awesome! Thanks so much joost. It does indeed compile just fine now. Those are good tips on porting Arudino code to the Photon too. I didn’t know about any of that. I’ll give it a try and let you know what happens.

Michele · February 26, 2018, 9:56pm

Hmmm. I got the screen to light up and then flicker when I run that code, but nothing else. It appears that I also need the Adafruit TFTLCD library. Checking the Libraries tab in the Web IDE doesn’t return anything for that.

Before I try it myself, does anyone happen to already have this ported to the Photon (from here: https://github.com/adafruit/TFTLCD-Library)

Michele · March 30, 2018, 12:24am

OK, well I finally have a resolution for this - sort of. I broke down and spent $20 for a Sparkfun Redboard (Arduino Uno clone). I dropped the Velleman display on top of it, loaded the example Arduino code and it ran just fine.

Then and only then it finally occured to me that this “serial” display uses up every single last pin of the Arduino except for two lonely I2C pins. Which makes this display great for I2C applications and not much else.

On the Photon side, I got the Adafruit_TFTLCD library to compile as far as it wanting a bunch of pin definitions. Then once again it dawned on me a bit late that the Arduino has a lot more pins than the Photon and therefore it’s never going to be possible to do a complete pin mapping.

The library implements everything even though all I want is serial communication. Teasing that out of that hairy ball of code was more than I cared to undertake so there you have it.

If anyone ever gets this Velleman (actually an Adafruit) display to work with the Photon, I’d love to hear about it.

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Velleman VMA412 2.8" serial LCD display code for Photon

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