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Altera_Forum's avatar
Altera_Forum
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16 years ago

VIP Control is Mutilating my Image!!!

Hello All, I have an interesting problem. I've managed to put together a video processing path: cvi->scaler->frame buf->cvo Which works reasonably well scaling SXGA to SVGA for displa...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

BREAKING DEVELOPMENT:

if i pull the control port out of the scaler, and just let it do it's thing default, it corrects the skew problem.

Question: what am I missing with the scaler? I'm executing these lines ONLY for the scaler to initialise:

void scaler_enable(void)

{

iowr( scaler_base, control, vip_stop );

iowr( scaler_base, scaler_reg_size_x, l2_x_size );

iowr( scaler_base, scaler_reg_size_y, l2_y_size );

iowr( scaler_base, control, vip_go );

}

and for readback:

alt_printf( "\nscaler registers:\n" );

alt_printf( " control: %x\n", iord( scaler_base, control ) );

alt_printf( " status: %x\n", iord( scaler_base, status ) );

alt_printf( " size x: %x\n", iord( scaler_base, scaler_reg_size_x ) );

alt_printf( " size y: %x\n", iord( scaler_base, scaler_reg_size_y ) );

where:

#define scaler_reg_control 0

# define scaler_reg_status 1

# define scaler_reg_size_x 2

# define scaler_reg_size_y 3