Altera DE1-SoC - Page 91

DE1-SoC User Manual
90
www.terasic.com
March 14, 2014
Figure 6-3 GPIO address map
 Software API
Developers can use the following software API to access the register of GPIO controller.
 open: open memory mapped device driver
 mmap: map physical memory to user space
 alt_read_word: read a value from a specified register
 alt_write_word: write a value into a specified register
 munmap: clean up memory mapping
 close: close device driver.
Developers can also use the following MACRO to access the register
 alt_setbits_word: set specified bit value to one for a specified register
 alt_clrbits_word: set specified bit value to zero for a specified register
The program must include the following header files to use the above API to access the registers of
GPIO controller.
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
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