Ibase SMARC-EVK1 Instrukcja Użytkownika Pobierz pdf (Strona 81)

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file = open(filename, O_RDWR);

if (file < 0 && (errno == ENOENT || errno == ENOTDIR)) {

sprintf(filename, "/dev/i2c-%d", i2cbus);

file = open(filename, O_RDWR);

}

if (file < 0 && !quiet) {

if (errno == ENOENT) {

fprintf(stderr, "Error: Could not open file "

"`/dev/i2c-%d' or `/dev/i2c/%d': %s\n",

i2cbus, i2cbus, strerror(ENOENT));

} else {

fprintf(stderr, "Error: Could not open file "

"`%s': %s\n", filename, strerror(errno));

if (errno == EACCES)

fprintf(stderr, "Run as root?\n");

}

return file;

}

int set_slave_addr(int file, int address, int force)

{

/* With force, let the user read from/write to the registers

even when a driver is also running */

if (ioctl(file, force ? I2C_SLAVE_FORCE : I2C_SLAVE, address) < 0) {

fprintf(stderr,

"Error: Could not set address to 0x%02x: %s\n",

address, strerror(errno));

return -errno;

}

return 0;

}

/*

i2cbusses.h

*/

#ifndef _I2CBUSSES_H

#define _I2CBUSSES_H

#include <unistd.h>

struct i2c_adap {

int nr;

char *name;

const char *funcs;

const char *algo;

};

struct i2c_adap *gather_i2c_busses(void);

void free_adapters(struct i2c_adap *adapters);

int lookup_i2c_bus(const char *i2cbus_arg);

int parse_i2c_address(const char *address_arg);

int open_i2c_dev(int i2cbus, char *filename, size_t size, int quiet);

int set_slave_addr(int file, int address, int force);

#define MISSING_FUNC_FMT "Error: Adapter does not have %s capability\n"

#endif

/*

util.c - helper functions

*/

#include <stdio.h>

#include "util.h"

Ibase SMARC-EVK1 Instrukcja Użytkownika Strona 81

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Ibase SMARC-EVK1 Instrukcja Użytkownika Strona 81

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