NAME
rtapi_outb, rtapi_inb - Perform hardware I/O
SYNTAX
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void rtapi_outb(unsigned char byte, unsigned int port) |
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unsigned char rtapi_inb(unsigned int port) |
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port |
The address of the I/O port |
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byte |
The byte to be written to the port |
DESCRIPTION
rtapi_outb writes a byte to a hardware I/O port. rtapi_inb reads a byte from a hardware I/O port.
REALTIME CONSIDERATIONS
May be called from init/cleanup code and from within realtime tasks. Not available in non-realtime components.
RETURN VALUE
rtapi_inb returns the byte read from the given I/O port
NOTES
The I/O address should be within a region previously allocated by rtapi_request_region. Otherwise, another real-time module or the Linux kernel might attempt to access the I/O region at the same time.