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RAlex4's avatar
RAlex4
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6 years ago

'KEYS_base' undeclared (first use in this function)

Hello,

I am starting to program the Nios II core using Eclipse tool. I have created a hardware system for an FPGA development kit using a Cyclone IV FPGA. Until now I have compiled my vhdl design, but not programmed the chip.

When I try to build my C code in Eclipse, I get three errors of the same kind. 'KEYS_base' undeclared, 'SW1_base' undeclared, 'SW2_base' undeclared. I have used the same declaration in my main.c file as in the system.h.

Can somebody help me understand what am I doing wrong?

3 Replies

  • RichardT_altera's avatar
    RichardT_altera
    Icon for Super Contributor rankSuper Contributor
    6 years ago

    Hi, may I know is the design originates from an outsources or a self-build design?

  • RAlex4's avatar
    RAlex4
    Icon for New Contributor rankNew Contributor
    6 years ago

    Hello Richard,

    Are you asking if I wrote the code? If so, then yes. I used the system.h header file to declare the inputs.

    However, I fixed this issue. In the system.h file, the inputs were defined in uppercase (SW1_BASE, SW2_BASE, KEYS_BASE), while I defined them 'base' in lowercase.

    Thanks,

    Reba