address

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originally posted by nwpu_zhf2004@Apr 11 2006, 06:17 AM

how can i access "my own component" i/o ports in nios ide?

what i should write in file "*_regs.h"?

how address and offset calculates?

eg:

//#define ioaddr_pdiusbd12_data(base) __io_calc_address_native(base, 0)# define iord_usb_usb_data(base) iord(base, 0) # define iowr_usb_usb_data(base, data) iowr(base, 0, data)

//#define ioaddr_pdiusbd12_command(base) __io_calc_address_native(base, 1)# define iord_usb_usb_command(base) iord(base, 1) # define iowr_usb_usb_command(base, data) iowr(base, 1, data)

---why the offset iord_usb_usb_data is "0",iord_usb_usb_command is "1"

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Address offset is defined in hardware register file which translates low level software I/O call to corresponding hardware addressing calls.