Vinay Salotagi wrote:
Hi All
I need to access some General Purpose I/O ports ( GPIO ), but don't have
much idea about GPIO. I searched in the Google but couldn't get much
information. So can any one send me the information or the links regarding
GPIO, like the h/w architecture, sys calls to get the base address, sys
calls to read, write and change the state of GPIO ports.
As in case of a PCI device, we read the config space and get device base
address , so is there any similar way in case of GPIO to get the base
address.
If it is memory mapped port, you can access the gpio port as if it were
a memory location. If it is io mapped, you will be able to use in() and
out() varieties of calls.
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