sharing uart by two processor cores

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originally posted by prasad_forums@Oct 14 2005, 10:24 PM

i have connected two nios processors to one uart.

also i have attached one mutex in sopc builder.

but when i run(mutually exclusive) in each processor

it is saying can't open the uart permission denied.

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Usually, connecting two processors to the same peripheral is a bad thing, since they can get into a fight. However, it is theoretically possible, if you use a mutex, and write your own device driver.

If you're using the HAL drivers, I'm pretty sure it won't work; you'll have to give each CPU its own UART.

Hi Mike,

thanks for the response,

i am having multiporcessor environment in the fpga

i have connected all the processor to flash and sdram and also sram

can i manage all these things with a single

mutex or should i need to have separate mutex for each and every resource

shared between the processors

regards

prasad

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originally posted by nobodii@Oct 19 2005, 05:20 AM

did you try to have two nios2-terminal connect? you might have conflict at the nios2-terminal because of the single com port that is connected, but not the nios ii because the sopc builder will take care of the switching between multiple master to a single slave.

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Hi niosdii,

what is this "Did you try to have two nios2-terminal connect? You might have conflict at the nios2-terminal" i could not understand what is that nios2-terminal connection!!!!

exactly i am getting the same problem.

also now one more thing.even if i try to have only one processor and only one connection to uart even then it is saying permission denied for accessing the uart as stdin/stdout/stderr.even single processor is unable to get uart control finally now.

i am unable to get the things clearly.can u please help me in this

thanks and regards

prasad