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Altera_Forum
Honored Contributor I
750 Views

Configure the Alpha Blending Mixer

Hi, When I debug the Alpha Blending Mixer, it is failed.  

Software:Quartusii 12.0 +Nios II Eclipe 

Project:  

Test Pattern Generator0 ---->  

|-- Alpha Blending Mixer---> Clocked video output 

Test Pattern Generator1----> 

 

I congfiure it follow the "Video and Image Processing Suite User Guide (Chapter 3: Interfaces Avalon-MM Slave Interfaces Page 50 of 290, July 2012)": 

 

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

1. Set the Go bit to zero. This causes the MegaCore function to stop if it gets to the end 

of a frame while the update is in progress. 

2. Update the control data. 

3. Set the Go bit to one. 

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

when I debug it at Nios II Eclipe, the 19" LCD display will blink only once, then it becomes black. 

//------------------------------------------------// 

IOWR(ALT_VIP_MIX_0_BASE, 0, 0); 

i= IORD(ALT_VIP_MIX_0_BASE, 1); 

 

IOWR(ALT_VIP_MIX_0_BASE, 2, 0); 

IOWR(ALT_VIP_MIX_0_BASE, 3, 0); 

IOWR(ALT_VIP_MIX_0_BASE, 4, 1); 

 

IOWR(ALT_VIP_MIX_0_BASE, 5, 0); 

IOWR(ALT_VIP_MIX_0_BASE, 6, 0); 

IOWR(ALT_VIP_MIX_0_BASE, 7, 1); 

 

IOWR(ALT_VIP_MIX_0_BASE, 0, 1); // after this step, the display will blink  

 

only once, then it became black.:( 

 

i= IORD(ALT_VIP_MIX_0_BASE, 1); 

//-----------------------------------------------------// 

 

By the way, When I debug the reference design at Alter Web: Scaler.zip, it works very well, but when I disabled the Scaler, then download and debug , it can't work.:confused: 

So I don't know what is wrong with it. The attenment is my project.Thanks! 

:)
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1 Reply
Altera_Forum
Honored Contributor I
25 Views

Hi,guys 

I find the root cause: the background is not the 1st layer:-P 

 

you don't need to congfigue the background,because it is on default. 

 

mixer.set_layer_position(0, 150, 0);//the 1st layer 

mixer.set_layer_enabled(0,true); 

 

mixer.set_layer_position(1, 600, 0);//the 2nd layer 

mixer.set_layer_enabled(1,true); 

 

---there are 3 layers. 

 

Thanks!:D