Configure the Alpha Blending Mixer

[Altera_Forum]

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! :)

[Altera_Forum]

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