rtapi_outb, rtapi_inb - Perform hardware I/O
void rtapi_outb(unsigned char byte, unsigned int port)
unsigned char rtapi_inb(unsigned int port)
rtapi_outb writes a byte to a hardware I/O port. rtapi_inb reads a byte from a hardware I/O port.
May be called from init/cleanup code and from within realtime tasks. Not available in userspace components.
rtapi_inb returns the byte read from the given I/O port
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.