Context:

For establish communication via UART with NEORV32 using the CuteCom terminal we must be added user dialout.

With the following command:

sudo usermod -aG dialout $USER

Restart the computer.

Check with the following command that the user dialout is added:

groups

Context:

I’m trying to connect the acceler module that it uses Std_Logic into a NEORV32 CPU that it uses Std_ULogic. For make conversions I’m using the Standard Logic Type Conversions includes in std_logic_1164 package

The std_logic_1164 package includes this functions:

  function To_bit       (s : STD_ULOGIC; xmap : BIT        := '0') return BIT;
  function To_bitvector (s : STD_ULOGIC_VECTOR; xmap : BIT := '0') return BIT_VECTOR;

  function To_StdULogic       (b : BIT) return STD_ULOGIC;
  function To_StdLogicVector  (b : BIT_VECTOR) return STD_LOGIC_VECTOR;
  function To_StdLogicVector  (s : STD_ULOGIC_VECTOR) return STD_LOGIC_VECTOR;
  function To_StdULogicVector (b : BIT_VECTOR) return STD_ULOGIC_VECTOR;
  function To_StdULogicVector (s : STD_LOGIC_VECTOR) return STD_ULOGIC_VECTOR;

This functions don't contemplate all cases.

For make Std_Logic to Std_ULogic conversion I do it in two steps. Fisrt I’m use To_bit conversion and then To_StdULogic conversion.

  bit_data <= to_bit(std_logic_data);
  s_ulogic_data <= To_StdULogic(bit_data);

And for make Std_ULogic to Std_Logic conversion I’m use with select:

  with std_ulogic_data select	
       std_logic_data <= '1' when '1',
                         '0' when others;

The question is, why are not there functions to do this two conversions directly?

Context:

To load a .C program to NEORV32 first we must compile it.
There are many alternatives to make this.

Custom GCC location:

Steps:

• First, download GCC custom with RISC-V toolchain from the following repository.

• Then, located in the folder where the program we want to compile is located together with the Makefile, execute:

PATH="/home/usainz/Descargas/riscv32-unknown-elf.gcc-12.1.0/bin/:$PATH" make install

The command PATH="/../:$PATH" instructs the system where to search for a program to run.
In this case, the custom GCC binary executables are indicated.
Therefore, the compilation is going to be done through this custom GCC.
The command make is used to automate the build process through the Makefile.
The command install is a target of the command make.
In this case install target will compile, generate and install VHDL IMEM boot image (for application, no header) both in the local folder and in neorv32/rtl/core.