[DE1] Making the VGA works with the IP VGA Controller

[Altera_Forum]

Hi all, 

I have a question about the DE1 Board. These day i am working on a project with SOPC and Nios II. My objective is to control DE1 feature directly in C with the Eclispe tools. Actually i can successfully control Led, Key , Switch , SEG7 , SDRAM and SRAM.  Did Someone have a working exemple for control the VGA with Nios II ? I have tested with this IP : http://www.altera.com/support/refdesigns/sys-sol/computing/ref-niosii-vga.html  VGA works but pixel coordinate aren't displayed properly ( picture attachement exemple) i wanted to display a 5x20 yellow rectangle at X=20 Y=20  Did you can help me to make this good strarting point for everyone want to use a simpliest way to control that Card :)  Thanks a lot

[Altera_Forum]

Hi all! 

I'm new in DE1 KIT. I'm building a SoC that displaying data from SDRAM into he screen through VGA. My SoC contents: - Nios II - On-Chip Memory -JTAG-UART - System ID - SDRAM - VGA  I want to display data from SDRAM to VGA by using DMA for reading data from SDRAM to VGA. My C program write data to SDRAM by NIOS. Then I use DMA to read data from SDRAM to VGA. When the interrupt occur, DMA will read 640 value (1 line) from SDRAM to VGA.    My VGA core has a FIFO to buffer data. When fifo is empty, the VGA core will make a interrupt signal to control the transferring of DMA.   My system has some problems such as: - First: When I use NIOS II to verify the read, write of SDRAM, it operates unstablely. I use "for" loop to write and read data to SDRAM but it just correct in the first 154 values - Second: When the interrupt occur, DMA only operates within two loop, in third loop, DMA reports the error : "Can post request..."  Anybody can help me. please!  Thanks so much!