Char Buffer UP IP

Hi

I'm trying to realize a text terminal on VGA display using Char buffer and VGA control available in UP IP v9.0

I've implemented the Nios on a DE1 board.

I'm sure that the hardware works properly, since writing a value directly on the mem position, a char appear on the VGA monitor

But I've some problem to write a suitable software.

I tried with:

int

main() {

int i;

alt_up_char_buffer_dev * my_ch_buf;

printf( "Nios II Alive!\n\n" );

my_ch_buf = alt_up_char_buffer_open_dev( "/dev/character_buffer_0_avalon_char_buffer_slave");

if ( my_ch_buf == NULL)

alt_printf ("Error: could not open pixel buffer device \n");

else

alt_printf ("Opened pixel buffer device \n");

i = alt_up_char_buffer_draw(my_ch_buf , 'A', 30,30);

printf( "res=%d",i );

}

but the answer is :( "Error: could not open pixel buffer device": infact the function "alt_up_char_buffer_open_dev" does not open the device and so the subcessive function "alt_up_char_buffer_draw" is unable to write anything.

Any suggestion?

Is maybe available some C examples using this device ?

Thank you in advance

Stefano