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Altera_Forum
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17 years ago

How to read and write value in two different systems?

Dear everyone, I am now working on a multicore system. cpu_0 runs uclinux, cpu_1 runs a piece of program, the base address of led_red( pio ) in the SOPCBuilder is 0x00400000, the base ...
Altera_Forum's avatar
Altera_Forum
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17 years ago

There are many ways to do a more portable hardware access. mmap is one of them. Others are a dedicated Kernel driver that more specifically handles the hardware in question and the "uio" stuff that does not seem use specific Kernel code.

Of course it might be that the "LED" "hardware" port does not provide read access to the latches holding the state of the LEDs. IMHO that would be quite unusual. You should check the appropriate HDL implementation and maybe upgrade it.

-Michael