P2 VGA Text driver

ozpropdev

Hi All
Here's a VGA text driver that I have been playing with.
Its VGA 800x600 with a 16x32 font (50x18 characters in 16 colors)

Cheers
Brian

cgracey

Neat! It looks like you've got the CLU_xxxx modes working.

ozpropdev

cgracey wrote: »

Neat! It looks like you've got the CLU_xxxx modes working.

I ended up doing a bit of dynamic shuffling of color data in aux to get the result I wanted.
When we have 200MHz, there should be enough cycles to use CLU4_RGB24 or even CLU8_RGB24 mode.
Cheers
Brian

ozpropdev

Hi All

I forgot to mention that the driver can easily support 50x37 characters as well.
To achieve the 16x16 font I "cheated" and use every second font line of the 16x32 font.
I doesn't look too bad.

If anyone has time to create a 16x16 font this could be enhanced.
This would also reduce the size of the font table from 16K to 8K!

Cheers
Brian

ozpropdev

For DE0-Nano users with current FPGA code.

Because the current Nano update does not support MUL32,GETMULL the following code changes are required.

Comment out the MUL32 and GETMULL lines.
Add two longs named m1,m2 and insert the code below.

		'	mul32	text_row,#50 * 2	'*100 (2 bytes per character)

			mov	m1,text_row		' x 100
			shl	m1,#6
			mov	m2,text_row
			shl	m2,#5
			add	m1,m2
			mov	m2,text_row
			shl	m2,#2
			add	m1,m2
			mov	text_row,m1

Brian

Sapieha

Hi Brian.

It is possible You made comments in this block.
That show what character every block represents.

I will made me different chars both in X and Y coordinates

' Char x1
        word    $FFFF,$FFFF,$FFFF,$FFFF,$000F,$000F,$000F,$000F
        word    $000F,$000F,$000F,$000F,$000F,$000F,$000F,$000F
        word    $000F,$000F,$000F,$000F,$000F,$000F,$000F,$000F
        word    $000F,$000F,$000F,$000F,$FFFF,$FFFF,$FFFF,$FFFF
' Char x2
        word    $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
        word    $0000,$0000,$0040,$0060,$0070,$0078,$7FFC,$7FFE
        word    $7FFE,$7FFC,$0078,$0070,$0060,$0040,$0000,$0000
        word    $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
' Char x3

and so on

ozpropdev wrote: »

Hi All

I forgot to mention that the driver can easily support 50x37 characters as well.
To achieve the 16x16 font I "cheated" and use every second font line of the 16x32 font.
I doesn't look too bad.

If anyone has time to create a 16x16 font this could be enhanced.
This would also reduce the size of the font table from 16K to 8K!

Cheers
Brian

ozpropdev

Sapieha
The attached file might help.
Cheers
Brian

Sapieha

Hi Brian.

That was all I need

Thanks.

ozpropdev wrote: »

Sapieha
The attached file might help.
Cheers
Brian