Unicorn GLCD demo.

Pommie · Nov 19, 2009

You must have changed some other part of the code as it works perfectly on mine. What happens if you call ClearScreen before printing the text?

Mike.

AtomSoft · Nov 20, 2009

what is your current code for:

Code:

void ClearScreen(void)

also pommie shouldnt this be more like:

Code:

void GLCD_Write_Data (unsigned char data){
	Wait_Not_Busy();
	GLCD_Data = [B]~(data)[/B];
	b_GLCD_RS=1;
	b_GLCD_RW=0;
	b_GLCD_E=1;
	Delay();
	b_GLCD_E=0;
}

unsigned char GLCD_Read_Data(void){
	Wait_Not_Busy();
	TRIS_Data=0xff;
	b_GLCD_RS=1;
	b_GLCD_RW=1;
	b_GLCD_E=1;
	Delay();
	W=[B]~(GLCD_Data)[/B];
	b_GLCD_E=0;
	TRIS_Data=0x00;
	return W;
}

haxan · Nov 20, 2009

Pommie it gives the same result.

ClearScreen when called actually turns the screen complete black. Is it possible that my screen is running in inverted mode already. When (in proteus) the screen is powered on, it gives black background.

AtomSoft: Its the same thing, gives the same result I tried what you said earlier before asking question here on forum

AtomSoft · Nov 20, 2009

Is this your GLCD clear screen?

Code:

void ClearScreen(void){
unsigned char i,j;
	b_GLCD_GCS1=1;
	b_GLCD_GCS2=1;	
	for(i=0;i<8;i++){
		GLCD_Write_Cmd(0x40);	//y=0
		GLCD_Write_Cmd(0xb8+i);	//x=0
		for(j=0;j<0x40;j++)
			GLCD_Write_Data(0x00);
	}
	SetPos(0,0);
}

AtomSoft · Nov 20, 2009

heh for some reason not working now

haxan · Nov 20, 2009

AtomSoft: It doesnt actually make any difference.

I have tried

GLCD_Write_Data(0x00);
and
GLCD_Write_Data(~(0x00));
and
GLCD_Write_Data(0xFF);

Still gives the same result

AtomSoft · Nov 20, 2009

heh please tell me you are trying this in proteus

AtomSoft · Nov 20, 2009

If you are then try this:

also revert all the data back to normal, meaning If you changed the read data and others put them back to normal.... the only thing that should be changed is:

Code:

void GLCD_Write_Data (unsigned char data){
	Wait_Not_Busy();
	[B]GLCD_Data =~data;[/B]
	b_GLCD_RS=1;
	b_GLCD_RW=0;
	b_GLCD_E=1;
	Delay();
	b_GLCD_E=0;
}

haxan · Nov 20, 2009

Thank you so much

It finally works by changing the initial contents of Ram.

Will this work in real GLCD project aswell (i hope so)

AtomSoft · Nov 20, 2009

it should heh.... and your welcome

ill test it out later on or tomorrow and ill take some pictures

AtomSoft · Nov 21, 2009

had 10 min free so here it is: (Tried it on 18F4620 tho)
From design to creation:

haxan · Nov 21, 2009

Thank you AtomSoft, its seems like you are an expert .

I am working on an image based display for Fan percentages

I have attached a small image (128 x 64) pixels which might give a little clearer idea.

Its kinda like volume bars going up and down according to input.

Will this be possible to make or are there some limitations that i might need to know prior to a result in vain.

AtomSoft · Nov 22, 2009

ShoulD be simple to do.. i would suggest using the line command. mainly because images take up a lot of space... you can have 1 function draw the bars .

hkBattousai · Nov 22, 2009

Is there any function to print numbers on the LCD?

I've just the one below, but doesn't work. It prints a junk of meaningless ASCII characters.

Code:

void glcd_Write8BitNumber(unsigned char num)
{
	unsigned char hundreds = 0, tens = 0;
	char szNum[4];
	
	if (num >= 200)
	{
		hundreds += 2;
		num -= 200;
	}
	else if (num >= 100)
	{
		hundreds++;
		num -= 100;
	}
	
	while (num >= 10)
	{
		num -= 10;
		tens++;
	}
	
	hundreds += 0x30;
	tens += 0x30;
	num += 0x30;
	
	szNum[0] = hundreds;
	szNum[1] = tens;
	szNum[2] = num;
	szNum[3] = 0;
	
	PutMessage((rom char*) szNum);
}

AtomSoft · Nov 22, 2009

heh easy one now

sprintf like...

Code:

    contrast = 57;

    sprintf(tempStr, "Contrast: %d",contrast);
    // lcd code to place string on lcd here

hkBattousai · Nov 22, 2009

^ Now it's worse. It clears out the screen when I try to print the string.

Code:

	while (1)
	{
		glcd_ClearScreen();
		glcd_SetPosition(0, 0);
		
		ADCON0 |= 0x02;
		while(ADCON0 & 0x02);
		
		glcd_PutMessage((rom char*) "The temperature is: ");
		//glcd_Write8BitNumber(ADRESH);
		//glcd_Write8BitNumber(ADRESL);
		glcd_Write8BitNumber(20);
		Delay10KTCYx(0);
	}

Code:

void glcd_Write8BitNumber(unsigned char num)
{
	char szNum[40];	// I think 40 is large enough
	sprintf(szNum, "%d", num);
	glcd_PutMessage((rom char*) szNum);
}

I see the string "The temperature is:" for half a second, then the screen is wiped out.

AtomSoft · Nov 22, 2009

Maybe cuz it's in a while loop also you can put

"the temp is: %d"

Pommie · Nov 22, 2009

You can't use PutMessage to print a string that is in RAM as it expects a ROM pointer. What you need to do is,

Code:

void glcd_Write8BitNumber(unsigned char num)
{
unsigned char szNum[40],i;	// I think 40 is large enough
    sprintf(szNum, "%d", num);
    for(i=0;szNum[i]!=0;i++)
        PutChar(szNum[i]);
}

But, I would make it print a signed integer,

Code:

void glcd_WriteInt(int num)
{
unsigned char szNum[7],i;       //can contain up to 6 characters with the sign
    sprintf(szNum, "%d", num);
    for(i=0;szNum[i]!=0;i++)
        PutChar(szNum[i]);
}

Mike.

AtomSoft · Nov 22, 2009

you could also create a new "glcd_PutMessage" and name it "glcd_PutMsg" but have it accept local non rom variables

haxan · Nov 23, 2009

I have a little problem making the lines.

When i put code:

box(120,0,128,0);
box(120,7,128,7);

It only displays one line. The problem is that the offset of the two lines needs to be more than 8 pixels. Is there any option of drawing boxes smaller than 8 pixels?

For example, according to my understanding, the following command should make a four pixel thick box but it doesnt.

box(0,0,128,4);

Unicorn GLCD demo.

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