gpioanalyser/gpio-raw.h

#ifndef GPIO_RAW_H
#define GPIO_RAW_H
#define BCM2708_PERI_BASE        0x20000000
#define GPIO_BASE                (BCM2708_PERI_BASE + 0x200000) /* GPIO controller */

#include <dirent.h>
#include <fcntl.h>
#include <assert.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>

#include <unistd.h>

#define PAGE_SIZE (4*1024)
#define BLOCK_SIZE (4*1024)

extern int  mem_fd;
extern char *gpio_mem, *gpio_map;
extern char *spi0_mem, *spi0_map;


// I/O access
extern volatile unsigned *gpio;

// GPIO setup macros. Always use INP_GPIO(x) before using OUT_GPIO(x) or SET_GPIO_ALT(x,y)
#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
#define OUT_GPIO(g) *(gpio+((g)/10)) |=  (1<<(((g)%10)*3))
#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3))

#define GPIO_SET *(gpio+7)  // sets   bits which are 1 ignores bits which are 0
#define GPIO_CLR *(gpio+10) // clears bits which are 1 ignores bits which are 0
#define GPIO_LEV *(gpio+13)
#define GPIO_VALUE_R(ALL, PIN) ((ALL & (1 << PIN)) != 0)
#define GPIO_VALUE(PIN) GPIO_VALUE_R(GPIO_LEV, PIN)

bool setup_io();

#endif // GPIO_RAW_H