我尝试编译一些代码，并在尝试编译时收到了这个响应：
./ smbus.c:26:23：致命错误：i2c / smbus.h：没有这样的文件或目录
编译终止。 ./altitude_ai.c：在功能
'bmp085_Altitude'：./ talitude_ai.c：207：4：警告：隐含
函数声明'pow'[-Wimplicit-function-declaration]
./ altitude_ai.c：207：14：警告：
的隐式声明不兼容内置功能'pow'[默认启用]
这是我尝试编译的所有代码：
smbus.c
/*
smbus.c - SMBus level access helper functions
Copyright (C) 1995-97 Simon G. Vogl
Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
Copyright (C) 2012 Jean Delvare <khali@linux-fr.org>
Copyright (C) 2012-2013 Donovan Roudabush <sharksfan98@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
#include <errno.h>
#include <i2c/smbus.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include "smbus.h"
#define NULL 0
/* Compatibility defines */
#ifndef I2C_SMBUS_I2C_BLOCK_BROKEN
#define I2C_SMBUS_I2C_BLOCK_BROKEN I2C_SMBUS_I2C_BLOCK_DATA
#endif
#ifndef I2C_FUNC_SMBUS_PEC
#define I2C_FUNC_SMBUS_PEC I2C_FUNC_SMBUS_HWPEC_CALC
#endif
__s32 i2c_smbus_access(int file, char read_write, __u8 command,
int size, union i2c_smbus_data *data)
{
struct i2c_smbus_ioctl_data args;
__s32 err;
args.read_write = read_write;
args.command = command;
args.size = size;
args.data = data;
err = ioctl(file, I2C_SMBUS, &args);
if (err == -1)
err = -errno;
return err;
}
__s32 i2c_smbus_write_quick(int file, __u8 value)
{
return i2c_smbus_access(file, value, 0, I2C_SMBUS_QUICK, NULL);
}
__s32 i2c_smbus_read_byte(int file)
{
union i2c_smbus_data data;
int err;
err = i2c_smbus_access(file, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data);
if (err < 0)
return err;
return 0x0FF & data.byte;
}
__s32 i2c_smbus_write_byte(int file, __u8 value)
{
return i2c_smbus_access(file, I2C_SMBUS_WRITE, value,
I2C_SMBUS_BYTE, NULL);
}
__s32 i2c_smbus_read_byte_data(int file, __u8 command)
{
union i2c_smbus_data data;
int err;
err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
I2C_SMBUS_BYTE_DATA, &data);
if (err < 0)
return err;
return 0x0FF & data.byte;
}
__s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value)
{
union i2c_smbus_data data;
data.byte = value;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
I2C_SMBUS_BYTE_DATA, &data);
}
__s32 i2c_smbus_read_word_data(int file, __u8 command)
{
union i2c_smbus_data data;
int err;
err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
I2C_SMBUS_WORD_DATA, &data);
if (err < 0)
return err;
return 0x0FFFF & data.word;
}
__s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value)
{
union i2c_smbus_data data;
data.word = value;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
I2C_SMBUS_WORD_DATA, &data);
}
__s32 i2c_smbus_process_call(int file, __u8 command, __u16 value)
{
union i2c_smbus_data data;
data.word = value;
if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
I2C_SMBUS_PROC_CALL, &data))
return -1;
else
return 0x0FFFF & data.word;
}
/* Returns the number of read bytes */
__s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values)
{
union i2c_smbus_data data;
int i, err;
err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
I2C_SMBUS_BLOCK_DATA, &data);
if (err < 0)
return err;
for (i = 1; i <= data.block[0]; i++)
values[i-1] = data.block[i];
return data.block[0];
}
__s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length,
const __u8 *values)
{
union i2c_smbus_data data;
int i;
if (length > I2C_SMBUS_BLOCK_MAX)
length = I2C_SMBUS_BLOCK_MAX;
for (i = 1; i <= length; i++)
data.block[i] = values[i-1];
data.block[0] = length;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
I2C_SMBUS_BLOCK_DATA, &data);
}
/* Returns the number of read bytes */
/* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you
ask for less than 32 bytes, your code will only work with kernels
2.6.23 and later. */
__s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length,
__u8 *values)
{
union i2c_smbus_data data;
int i, err;
if (length > I2C_SMBUS_BLOCK_MAX)
length = I2C_SMBUS_BLOCK_MAX;
data.block[0] = length;
err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN :
I2C_SMBUS_I2C_BLOCK_DATA, &data);
if (err < 0)
return err;
for (i = 1; i <= data.block[0]; i++)
values[i-1] = data.block[i];
return data.block[0];
}
__s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length,
const __u8 *values)
{
union i2c_smbus_data data;
int i;
if (length > I2C_SMBUS_BLOCK_MAX)
length = I2C_SMBUS_BLOCK_MAX;
for (i = 1; i <= length; i++)
data.block[i] = values[i-1];
data.block[0] = length;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
I2C_SMBUS_I2C_BLOCK_BROKEN, &data);
}
/* Returns the number of read bytes */
__s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length,
__u8 *values)
{
union i2c_smbus_data data;
int i, err;
if (length > I2C_SMBUS_BLOCK_MAX)
length = I2C_SMBUS_BLOCK_MAX;
for (i = 1; i <= length; i++)
data.block[i] = values[i-1];
data.block[0] = length;
err = i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
I2C_SMBUS_BLOCK_PROC_CALL, &data);
if (err < 0)
return err;
for (i = 1; i <= data.block[0]; i++)
values[i-1] = data.block[i];
return data.block[0];
}
smbus.h
/*
smbus.h - SMBus level access helper functions
Copyright (C) 1995-97 Simon G. Vogl
Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
Copyright (C) 2012-2013 Donovan Roudabush <sharksfan98@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
This software has been distrobuted for the Gryphon 7i series,
maintained Jan 2013 by Donovan Roudabush at The Ballon Project
This falls under GPL and Copyleft, but is intended for
Research use.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
#ifndef LIB_I2C_SMBUS_H
#define LIB_I2C_SMBUS_H
#include <linux/types.h>
#include <linux/i2c.h>
extern __s32 i2c_smbus_access(int file, char read_write, __u8 command,
int size, union i2c_smbus_data *data);
extern __s32 i2c_smbus_write_quick(int file, __u8 value);
extern __s32 i2c_smbus_read_byte(int file);
extern __s32 i2c_smbus_write_byte(int file, __u8 value);
extern __s32 i2c_smbus_read_byte_data(int file, __u8 command);
extern __s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value);
extern __s32 i2c_smbus_read_word_data(int file, __u8 command);
extern __s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value);
extern __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value);
/* Returns the number of read bytes */
extern __s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values);
extern __s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length,
const __u8 *values);
/* Returns the number of read bytes */
/* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you
ask for less than 32 bytes, your code will only work with kernels
2.6.23 and later. */
extern __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length,
__u8 *values);
extern __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length,
const __u8 *values);
/* Returns the number of read bytes */
extern __s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length,
__u8 *values);
#endif /* LIB_I2C_SMBUS_H */
altitude_ai.c
#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/i2c-dev.h>
#include <linux/i2c.h>
#include <sys/ioctl.h>
#include "smbus.h"
#define BMP085_I2C_ADDRESS 0x77
const unsigned char BMP085_OVERSAMPLING_SETTING = 3;
// Calibration values - These are stored in the BMP085
short int ac1;
short int ac2;
short int ac3;
unsigned short int ac4;
unsigned short int ac5;
unsigned short int ac6;
short int b1;
short int b2;
short int mb;
short int mc;
short int md;
int b5;
unsigned int temperature, pressure, altitude;
// Open a connection to the bmp085
// Returns a file id
int bmp085_i2c_Begin()
{
int fd;
char *fileName = "/dev/i2c-0";
// Open port for reading and writing
if ((fd = open(fileName, O_RDWR)) < 0)
exit(1);
// Set the port options and set the address of the device
if (ioctl(fd, I2C_SLAVE, BMP085_I2C_ADDRESS) < 0) {
close(fd);
exit(1);
}
return fd;
}
// Read two words from the BMP085 and supply it as a 16 bit integer
__s32 bmp085_i2c_Read_Int(int fd, __u8 address)
{
__s32 res = i2c_smbus_read_word_data(fd, address);
if (res < 0) {
close(fd);
exit(1);
}
// Convert result to 16 bits and swap bytes
res = ((res<<8) & 0xFF00) | ((res>>8) & 0xFF);
return res;
}
//Write a byte to the BMP085
void bmp085_i2c_Write_Byte(int fd, __u8 address, __u8 value)
{
if (i2c_smbus_write_byte_data(fd, address, value) < 0) {
close(fd);
exit(1);
}
}
// Read a block of data BMP085
void bmp085_i2c_Read_Block(int fd, __u8 address, __u8 length, __u8 *values)
{
if(i2c_smbus_read_i2c_block_data(fd, address,length,values)<0) {
close(fd);
exit(1);
}
}
void bmp085_Calibration()
{
int fd = bmp085_i2c_Begin();
ac1 = bmp085_i2c_Read_Int(fd,0xAA);
ac2 = bmp085_i2c_Read_Int(fd,0xAC);
ac3 = bmp085_i2c_Read_Int(fd,0xAE);
ac4 = bmp085_i2c_Read_Int(fd,0xB0);
ac5 = bmp085_i2c_Read_Int(fd,0xB2);
ac6 = bmp085_i2c_Read_Int(fd,0xB4);
b1 = bmp085_i2c_Read_Int(fd,0xB6);
b2 = bmp085_i2c_Read_Int(fd,0xB8);
mb = bmp085_i2c_Read_Int(fd,0xBA);
mc = bmp085_i2c_Read_Int(fd,0xBC);
md = bmp085_i2c_Read_Int(fd,0xBE);
close(fd);
}
// Read the uncompensated temperature value
unsigned int bmp085_ReadUT()
{
unsigned int ut = 0;
int fd = bmp085_i2c_Begin();
// Write 0x2E into Register 0xF4
// This requests a temperature reading
bmp085_i2c_Write_Byte(fd,0xF4,0x2E);
// Wait at least 4.5ms
usleep(5000);
// Read the two byte result from address 0xF6
ut = bmp085_i2c_Read_Int(fd,0xF6);
// Close the i2c file
close (fd);
return ut;
}
// Read the uncompensated pressure value
unsigned int bmp085_ReadUP()
{
unsigned int up = 0;
int fd = bmp085_i2c_Begin();
// Write 0x34+(BMP085_OVERSAMPLING_SETTING<<6) into register 0xF4
// Request a pressure reading w/ oversampling setting
bmp085_i2c_Write_Byte(fd,0xF4,0x34 + (BMP085_OVERSAMPLING_SETTING<<6));
// Wait for conversion, delay time dependent on oversampling setting
usleep((2 + (3<<BMP085_OVERSAMPLING_SETTING)) * 1000);
// Read the three byte result from 0xF6
// 0xF6 = MSB, 0xF7 = LSB and 0xF8 = XLSB
__u8 values[3];
bmp085_i2c_Read_Block(fd, 0xF6, 3, values);
up = (((unsigned int) values[0] << 16) | ((unsigned int) values[1] << 8) | (unsigned int) values[2]) >> (8-BMP085_OVERSAMPLING_SETTING);
return up;
}
// Calculate pressure given uncalibrated pressure
// Value returned will be in units of XXXXX
unsigned int bmp085_GetPressure(unsigned int up)
{
int x1, x2, x3, b3, b6, p;
unsigned int b4, b7;
b6 = b5 - 4000;
// Calculate B3
x1 = (b2 * (b6 * b6)>>12)>>11;
x2 = (ac2 * b6)>>11;
x3 = x1 + x2;
b3 = (((((int)ac1)*4 + x3)<<BMP085_OVERSAMPLING_SETTING) + 2)>>2;
// Calculate B4
x1 = (ac3 * b6)>>13;
x2 = (b1 * ((b6 * b6)>>12))>>16;
x3 = ((x1 + x2) + 2)>>2;
b4 = (ac4 * (unsigned int)(x3 + 32768))>>15;
b7 = ((unsigned int)(up - b3) * (50000>>BMP085_OVERSAMPLING_SETTING));
if (b7 < 0x80000000)
p = (b7<<1)/b4;
else
p = (b7/b4)<<1;
x1 = (p>>8) * (p>>8);
x1 = (x1 * 3038)>>16;
x2 = (-7357 * p)>>16;
p += (x1 + x2 + 3791)>>4;
return p;
}
// Calculate temperature given uncalibrated temperature
// Value returned will be in units of 0.1 deg C
unsigned int bmp085_GetTemperature(unsigned int ut)
{
int x1, x2;
x1 = (((int)ut - (int)ac6)*(int)ac5) >> 15;
x2 = ((int)mc << 11)/(x1 + md);
b5 = x1 + x2;
unsigned int result = ((b5 + 8)>>4);
return result;
}
// This Altitude part is stolen from some some unknown
// Arduino library. The number divided into pressure for
// float A is derived from the local pressure as explained
// at http://learn.adafruit.com/bmp085/using-the-bmp085.
unsigned int bmp085_Altitude(float pressure)
{
float A = pressure/101794.58;
float B = 1/5.25588;
float C = pow(A,B);
C = 1 - C;
C = C / 0.0000225577;
return C;
}
int main(int argc, char **argv)
{
bmp085_Calibration();
temperature = bmp085_GetTemperature(bmp085_ReadUT());
pressure = bmp085_GetPressure(bmp085_ReadUP());
altitude = bmp085_Altitude(pressure);
printf("Temperature\t%0.1f *F\n", ((double)temperature)/10 * 1.8 + 32);
printf("Pressure\t%0.2f hPa\n", ((double)pressure)/100);
printf("Altitude\t%0.1f Feet\n\n", ((double)altitude)*3.280839895);
return 0;
}
你们可以帮我修复错误信息吗？提前谢谢〜
答案 0 :(得分：2)
我认为代码期望两个文件都叫做smbus.h。一个在本地目录中，另一个在系统中包含子目录i2c中的目录。您应该能够使用类似命令搜索smbus.h的所有实例 find / -name“smbus.h”2＆gt; / dev / null
可能需要一些时间但是值得等待，如果它解决了问题。
我怀疑你错过了系统文件，而你只有一份smbus.h。 如果你发现另一个smbus.h是一个名为i2c的目录，你需要将包含i2c目录的目录添加到系统包含路径中。我不确定这是怎么做的。我认为它是一个环境变量。
是否有任何关于获取i2c支持包的代码的说明？
sudo apt-get install <something>
编辑： 实际上如果找到其他文件，你可能会作弊。
<i2c/smbus.h>
到
"i2c/smbus.h"
并添加到make文件中的编译行
-I/where/ever/the/file/was
假设您在
中找到了该文件/where/ever/the/file/was/i2c/smbus.h