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Altera_Forum
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8 years ago

How to define CPU ID in multiprocessor design based on NIOS II CPU?

Hi, I have try this code in my NIOS code : printf("NIOS %d is waiting for control signal\n",ALT_CPU_CPU_ID_VALUE); I have implement 3 nios processor in my project. Why this ALT_CPU_CPU_...
Altera_Forum's avatar
Altera_Forum
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8 years ago

ALT_CPU_CPU_ID_VALUE is nothing more than a# define in the "system.h" file of the BSP. It is not a function.

You will need to create a different a BSP project for each NIOS processor in your design. This will result in a different ALT_CPU_CPU_ID_VALUE in each BSP.

Alternatively, connect a different System ID peripheral to each NIOS processor, with the value set to match the CPU ID. You can then read the value of the peripheral instead of using the# define. That way it will be a run-time calculated value, not a compile time value.