eDIPTFT43-ATP programming

Other Hardware Displays
1

Hello,
I have this GLCD to a Arduino Mega. It turns on and I can send simple commands. I found a quick sample that works using the Wire.h. The problem is the way the commands are sent. There is no problem converting the commands to bytes when it is a one for one. It is kinda hard to explain here is the sample code that I found:
I found it here

#include <Wire.h>
#define i2c_eaDIP ( 0xDE >> 1 )       // Ba2|Ba1|Ba0|Sa2|Sa1|Sa0|R/W

byte bcc;       

void setup()
{
  Serial.begin(9600);

  Wire.begin();           // join i2c bus (address optional for master)
  Wire.beginTransmission(i2c_eaDIP);  // transmit to device #0xDE
  Display_loeschen();
  Serial.println( Wire.endTransmission(), DEC);     // stop transmitting

  delay(100);

  Wire.requestFrom(0xDF, 1);
  Serial.println(Wire.available(), HEX);
  Serial.println(Wire.receive(), HEX);
 }

void Display_loeschen() {
  Wire.send(0x11);   // <DC1>
  Wire.send(0x03);   // len
  Wire.send(0x1B);   // ESC
  Wire.send('D');
  Wire.send('L');
  bcc = ( 0x11 + 0x03 + 0x1B + 'D' + 'L' ) % 0x100;
  Wire.send(bcc);
}

void loop()
{
  for(;;)
    ;
}

So pretty much you have to send 0x11 fist all the time, then the size, then ESC then the commands. Here is the manual link:

Notice on page 10 they have some example that makes no sense to me. All I just need to know is how they got those HEX numbers there
the sample command is

<DC1> len ESC D L ESC G D 0 0 479 271 bcc
$11 $0E $1B $44 $4C $1B $47 $44 $00 $00 $00 $00 $DF $01 $0FE $01 $6

so for each 0 they put 2 $00
for 479 they put $DF $01
and for 271 $0FE $01
I have a function that I wrote that takes the string command and gets each character and turns it to a bytes.

void  sendData( String commandString, boolean command){
	Wire.write(0x11);
	int bcc = 0x11;
	int buf = commandString.length()+1;
        
        char bytes[buf];
	commandString.toCharArray(bytes, buf);
        buf = buf-1;
        int length = buf;
	if(command){
		length = length + 1;
	}
	
	bcc = bcc + length;
	Wire.write(length); // length
	if(command){
		Wire.write(27); // ESC
		bcc = bcc + 27;
	}
	
	for(int i =0 ; i < buf; i++){
		Wire.write((int)bytes[i]);
		bcc = bcc + (int)bytes[i];
	}
	Wire.write(bcc);
}

This works great sendData("DL", true);
But, it messes up when I try the example "ESCGD00479271"
Even If I was to break out each segment how do I figure out the size.

Any help would be greatly appreciated.

Thanks,
-Martin

Moderator edit: [code] ... [/code] tags added. (Nick Gammon)

2

Just in case it might help anyone.
I found out what is going on with sending numbers. Apparently it sends numbers broken out into 2 parts of 2 hex numbers and backwards. For example: 479 decimal is 1DF HEX
But it send it $DF then $01.
It took me a while to finally see it, I'm just happy I understand whats going on now.
I will post the method I am working on that will send the commands correctly once it is finish.

I just have one issue with sending multiple commands. I have posted a question in the connection section where the I2C stuff is because I think it has to do with that. Unless it is the GLCD who is limited to only one command, I need to check it out.

Here is the link to the other post : http://arduino.cc/forum/index.php/topic,100597.0.html

Thanks,
Martin

3

mjsalinas:
I just have one issue with sending multiple commands. I have posted a question in the connection section where the I2C stuff is because I think it has to do with that. Unless it is the GLCD who is limited to only one command, I need to check it out.

Post your code please.

4

Thanks for the help.

#include <Wire.h>
#define i2c_eaDIP ( 0xDE >> 1)       // Ba2|Ba1|Ba0|Sa2|Sa1|Sa0|R/W

byte bcc;       

void setup()
{
  Serial.begin(9600);

  Wire.begin();           // join i2c bus (address optional for master)
  //Wire.beginTransmission(i2c_eaDIP);  // transmit to device #0xDE
  command1();
  //Serial.println( Wire.endTransmission(), DEC);     // stop transmitting

  delay(100);
 }

void loop()
{
}

void command1(){
  Wire.beginTransmission(i2c_eaDIP);
  Serial.println("***************************");
  Wire.write((byte)17);   // <DC1>
  Serial.println((byte)17);
  Wire.write((byte)11);   // len
  Serial.println((byte)11);
  Wire.write((byte)27);   // ESC
  Serial.println((byte)27);
  Wire.write((byte)71);
  Serial.println((byte)71);
  Wire.write((byte)68);
  Serial.println((byte)68);
  Wire.write((byte)00);
  Serial.println((byte)00);
  Wire.write((byte)00);
  Serial.println((byte)00);
  Wire.write((byte)00);
  Serial.println((byte)00);
  Wire.write((byte)00);
  Serial.println((byte)00);
  Wire.write((byte)223);
  Serial.println((byte)223);
  Wire.write((byte)01);
  Serial.println((byte)01);
  Wire.write((byte)15);
  Serial.println((byte)15);
  Wire.write((byte)01);
  Serial.println((byte)01);
  bcc = ( 17 + 11 + 27 + 71 + 68 + 00 + 00 + 223 + 01 + 15 + 01 ) % 0x100;
  Wire.write(bcc);
  Serial.println(bcc);
  Serial.println( Wire.endTransmission(), DEC);
  
  Wire.beginTransmission(i2c_eaDIP); 
  Wire.write((byte)17);   // <DC1>
  Serial.println((byte)17);
  Wire.write((byte)3);   // len
  Serial.println((byte)3);
  Wire.write((byte)27);   // ESC
  Serial.println((byte)27);
  Wire.write((byte)68);
  Serial.println((byte)68);
  Wire.write((byte)76);
  Serial.println((byte)76);
  bcc = ( 17 + 3 + 27 + 68 + 76 ) % 0x100;
  Wire.write(bcc);
  Serial.println(bcc);
  Serial.println( Wire.endTransmission(), DEC);
  delay(100);
  Wire.requestFrom(0xDF, 1);
}

I output to the serial to see exactly what is being sent. Once I get this part to work I can complete a function that will automate this process.

Thanks for the help again.
Martin

5

Ah, wouldn't this be a lot easier? ...

const byte firstCommand [] = { 17, 11, 27, 71, 68, 0, 0, 0, 0, 223, 1, 15, 1 };

void command1(){
  Wire.beginTransmission(i2c_eaDIP);
  Wire.write (firstCommand, sizeof firstCommand);
  bcc = 0;
  for (byte i = 0; i < sizeof firstCommand; i++)
    bcc += firstCommand [i];
  Wire.write(bcc % 0x100);
  Serial.println( Wire.endTransmission(), DEC);

...

(I might not have copied all the numbers correctly, better check).

Anyway, what's the exact problem? You are only doing one Wire.request, so I would only expect one thing back.

6

Thanks for the help.
The main problem I am having is that I would like to send multiple commands to the screen.
For example:
1.Clear the screen
2.Display a menu
3. Change the menu option selected
4. Change the screen once an option is selected.
...

I modified my code with what you suggested but it does the same thing. It only seems to execute the first command.

#include <Wire.h>
#define i2c_eaDIP ( 0xDE >> 1)       // Ba2|Ba1|Ba0|Sa2|Sa1|Sa0|R/W

byte bcc;       
const byte secondCommand [] = { 17, 03, 27, 68, 76};
const byte firstCommand [] = { 17, 11, 27, 71, 68, 0, 0, 0, 0, 223, 1, 15, 1 };

void setup()
{
  Serial.begin(9600);

  Wire.begin();           // join i2c bus (address optional for master)
  //Wire.beginTransmission(i2c_eaDIP);  // transmit to device #0xDE
  command1();
  command2();
  //Serial.println( Wire.endTransmission(), DEC);     // stop transmitting

  delay(100);

  //Wire.requestFrom(0xDF, 1);
  //Serial.println(Wire.available(), HEX);
  //Serial.println(Wire.read(), HEX);
 }
 
void loop()
{
}
 
void command1(){
  Wire.beginTransmission(i2c_eaDIP);
  Wire.write (firstCommand, sizeof firstCommand);
  bcc = 0;
  for (byte i = 0; i < sizeof firstCommand; i++)
    bcc += firstCommand [i];
  Wire.write(bcc % 0x100);
  Serial.println( Wire.endTransmission(), DEC);
  Wire.requestFrom(0xDF, 1);
}

void command2(){
  Wire.beginTransmission(i2c_eaDIP);
  Wire.write (secondCommand, sizeof secondCommand);
  bcc = 0;
  for (byte i = 0; i < sizeof secondCommand; i++)
    bcc += secondCommand [i];
  Wire.write(bcc % 0x100);
  Serial.println( Wire.endTransmission(), DEC);
  Wire.requestFrom(0xDF, 1);
}

I'm new in using I2C. How is a request submitted and executed and how does it get ready for the next command?
Or am I just going at this all wrong?

Thanks,
Martin

7

Why are you requesting stuff anyway? You aren't reading it.

I would expect something like:

void command1()
  {
  Wire.beginTransmission(i2c_eaDIP);
  Wire.write (firstCommand, sizeof firstCommand);

  // calculate sum check
  bcc = 0;
  for (byte i = 0; i < sizeof firstCommand; i++)
    bcc += firstCommand [i];

  // send sumcheck
  Wire.write(bcc % 0x100);

  // done
  if (Wire.endTransmission() != 0)
     return;   // error on send

  if (Wire.requestFrom(i2c_eaDIP, 1) != 1)
     return;   // nothing received

  byte foo = Wire.read ();

  // do something with foo here
}

BTW you request from, and send to, the same address. You didn't seem to be doing that.

8

Thanks much Nick,
That seems to do it. I put a Serial.println(foo); and I get the 6 that the documentation says it should be returning for both commands. It clears the screen then draws the line, or if I flip them it draws the line then clears the screen.

BTW, I see what you mean about the

In the documentation under the I2C stuff it says

all pins open: Write $DE
Read $DF

I didn't know how this stuff works, so I assumed to read from it must get it from that address.

Thanks for the help, it is much appreciated.
-Martin

9

mjsalinas:
In the documentation under the I2C stuff it says ...

The Wire library does that for you. So you use the address shifted 1 bit to the right. Then the library puts the read/write bit in for you.