Okay,
I've been trying for days to get i2c-dev working properly. I have everything I
need according to instructions, but for some reason I keep getting errors at
ioctl. I'm using OpenWRT on a atheros platform. Everything is compiling
properly without error but I am getting ioctl errors out the wazoo.
//CODE
//TEST BEGIN
int file;
//Open i2c dev
if(file = open( "/dev/i2c-0", O_RDWR )<0)
{
enabled = -1;
printf("Unable to open file /dev/i2c-0.\n");
}
else
{
printf("Opened file /dev/i2c-0.\n");
enabled = 1;
}
printf("File is %d\n",file);
if( ioctl( file, I2C_SLAVE, 0x4b ) < 0 )
{
printf("Error opening file: %s\n", strerror( errno ) );
printf("Open chip %d FAILED file %d\n", 0x4b, file);
}
else
{
printf("Open chip %d Succeeded file %d\n",0x4b, file);
}
//CODE END
At the level of ioctl(file, i2C_SLAVE,address) I get the following error:
"Error opening file: Invalid argument". So I'm successfully opening /dev/i2c-0
but I can't do a ioctl to the specific chip address. I've already verified the
chip address using i2cdetect, and I've also verified that I can read/write with
the other i2ctools suite.
What am I missing?
I am including the i2c-dev.h file from the the i2c-tools package. I just put it
in my src directory and I #include "i2c-dev.h" as my final include in my .cpp
file. All the defines and functions are configuring correctly, so I imagine
it's included right. But I wonder if I need to compile the i2c-dev.h file
separately or in a different way than my other code?
I am compiling with -O2 as I understand that's somehow required. Not sure if
there needs to be anything else special in my make file since everything is
building correctly without errors.
-Nathan
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