C5515 eZdsp OLED - How to write a char?

Hi,

I'm attaching ROM table map. There are 256 characters stored in ROM. Each character is 3 words length.

The font size is 6x8.

#pragma DATA_SECTION(CharGen_6x8, ".charrom")

Uint16 CharGen_6x8[256*3];

Here ROM data is available as variable CharGen_6x8.

The first address of each font will be CharGen_6x8[0], CharGen_6x8[3], CharGen_6x8[6] and so on.

Int16 printchar(unsigned char a)

{

Uint8 data;

data = ((CharGen_6x8[a*3])>>8) & 0x00FF;

    OSD9616_send(0x40,data);

    data = (CharGen_6x8[a*3]) & 0x00FF;

    OSD9616_send(0x40,data);

    data = ((CharGen_6x8[a*3+1])>>8) & 0x00FF;

    OSD9616_send(0x40,data);

    data = (CharGen_6x8[a*3+1]) & 0x00FF;

    OSD9616_send(0x40,data);

    data = ((CharGen_6x8[a*3+2])>>8) & 0x00FF;

    OSD9616_send(0x40,data);

    data = (CharGen_6x8[a*3+2]) & 0x00FF;

    OSD9616_send(0x40,data);

    return 0;

}

Regards,

Hyun

Hi,

Thanks,. I would like to make some big fonts. So how the data prints in LCD when executing "OSD9616_send(0x40,data)" ? how the 6x8 is represented by just 3 bytes?

Thanking You,

Ras

Hi,

One fonts consists of three words.

For example character "A" is {0x7E88, 0x8888, 0x7E00}.

It's bitmap data, The first byte 0x7E is the first column data 0 1 1 1 1 1 1 0. The second column data is 0x88 and so on.

0x7E88, 0x8888, 0x7E00

0 1 1 1 0 0 0 

1 0 0 0 1 0 0

1 0 0 0 1 0 0

1 0 0 0 1 0 0

1 1 1 1 1 0 0

1 0 0 0 1 0 0

1 0 0 0 1 0 0

0 0 0 0 1 0 0

Regards,

Hyun

Hi,

One more thing, where is the details of 5515 rom data? I searched in the datasheet. Any easy way to generate fonts e.g by using excel sheets or any utility programs?

Thanking You,

Ras

Hi,

There is no document regarding ROM data.

You need to buy or create your own fonts. I attached different size fonts (8x8) from C5515EVM example code.

Regards,

Hyun

Hyun,

This font table is not compatible with the OSD9616 display used on the C5515 ezdsp. It is organized in rows instead of columns. Do you have a compatible table?

OK folks. Here's my contribution to the community. It's awesome !

Enjoy!!

http://www.pavius.net/2009/07/the-dot-factory-an-lcd-font-and-image-generator/

Hi Hyun,

I have the CSL_USB_IsoFullSpeedExample_ezdsp example running perfectly.

Now I want to also display texts in my own project.

While trying to understand how it all works I found the only reference to the "charrom" in the linker command file (lnkx.cmd)

MEMORY
{
CROM (RX) : origin = 0xfe0000, length = 0x000600 /* 1536B */
}

/* SPECIFY THE SECTIONS ALLOCATION INTO MEMORY */

SECTIONS
{
.charrom > CROM
}

What I don't understand is: how does the linker/compiler know where the data is that should be included? What is the file name of the font file? How does this magic work?

Looking forward to your reply; thanks in advance

Florian

Hi,

Please create your request as a new thread since old threads would be paid lesser attention compared to new threads.

Thanks & regards,

Sivaraj K

Florian,

Charactor data is stored in the ROM at 0xfe0000. In the progam, #pragma links that address to a variable.

Look for ".charrom" where is linked to.

Regards,

Hyun