EZDSP5535 - OSD9616 - printLetter(0x01,0x7C,0x04,0x01); // Y - Anyone have a complete library?

Hello,

No one has all of the characters done in a file/library?

TIA,
johnw 

Hi,

I am also facing the same problem...

Could you find the lib for this???

Hey,

I know it is a old question, but maybe that will help somebody else who is searching information about this topic.

You do not need a additional ascii libary on C553x for oled as there is a graphical 6x8dots (and ascii) charset included in ROM. To use it you must link that code section it to your code and write a function which use this table to generate correct ascii symbol.

-----------------------------------------------------------------------------

Example:

#pragma DATA_SECTION(charset_6x8, ".gcharrom")
unsigned int charset_6x8[256*3];                                                      

// graphical charset (included in-chip rom of C553x), 6Bytes are(draw) one symbol
// ascii standard table is 256Bytes x 6 = 1536Bytes
// to get start of symbol multiply ascii value with 3 (! because of int16 in memory)
// e.g. ascii char symbol: A => 65d position in memory is 195d (0xc3) (! word addr.)
//      => byte_of_charA[0]=0xc3(high), byte_of_charA[1]=0xc3(low), byte_of_charA[2]=0xc4(high), ...

    void printc_oled(char symbol) {
    
        unsigned int *chargen         = &charset_6x8[(symbol&0xff)*3];                  // start addr. in rom grapical charset
        unsigned int data[2];
        unsigned int i;
        
        for (i=0; i<3; i++) {                                                                   
            data[0] = chargen[i]>>8;                                                     // seperate int16 words of 6x8Byte grapical charset
            data[1] = chargen[i]&0xff;                                                    // to bytes (high and low)
            com_i2c_tx(OLED,2,OLED_DATA,&data[0]);                  // write char on oled (into internal gram of oled) via i2c
        }                                    
    }

print_oled('T');print_oled('E');print_oled('S');print_oled('T');     // write on oled

-----------------------------------------------------------------------------

Additional you need to link the .gcharrom via your cmd linke file to adresse 0xfe0000 (see SPRABL7A for more information), Example:

MEMORY

{

...

    GCROM    (RX) : origin = 0xfe0000 length = 000600h          // on-chip ROM graphic chartable 6x8 (1536 Byte)

}

SECTIONS

{

...

    .gcharrom    : > GCROM                                    // graphical chartable 6x8 pixel

}

I hope that helps!

Regards,

Max

Hi, I need to solve this kind of problem. According to your example, I got the copiling error about "OLED_DATA" and "OLED" undefined. Can you give me more description about your code? Thanks, you really do me a great help.

Hey everybody,

I used my own I2C stack, so define of OLED is I2C adr. (0x3c) and define OLED_DATA is command to OLED that next send data is data to display (and not a command). You can use EZDSP function instead like Aly mentioned.

Best regards,

Max

Hi Ulbert,

you need to do that in you linker file (*.cmd file) like I mentioned at the end of my old post:

This few lines will do the job:

MEMORY

{

...

    GCROM    (RX) : origin = 0xfe0000 length = 000600h          // on-chip ROM graphic chartable 6x8 (1536 Byte)

}

SECTIONS

{

...

    .gcharrom    : > GCROM                                    // graphical chartable 6x8 pixel

}

First block will select array of memory (origin plus length) and second block will link it to .gcharrom mark (which I use later in my *.c file).

I hope that will help.

Regards,

Max