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Altera_Forum
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13 years ago

Controlling LCD through NIOS

I am working with the Altera DE-2 kit, Cyclone II: EP2C35F672C6 FPGA. If I use VHDL I am able to use the LCD on the board but attempting top do so in NIOS is not working. I tried to use the bi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I finally got this to work, started quartus project from scratch with the previously mentioned components, the code above except I added:

LCD_ON <= '1';

LCD_BLON <= '1';

The one thing that is very frustrating is why the NIOS IDE keeps throwing an elf error or system id mismatch error for what seems to be no apparent reason.

For example, I add a component in the SOPC, or an input in the entity block, update the BSP and suddenly I will see an error message that the elf can't be downloaded or the the system ID does not match the ID value on the board. No major changes in the quartus project, non at all on the NIOS C code, and for some reason error.