Have a look at the lmsensors project (sorry - don't have the URL handy).
There are some simple example i2c programs there, but basically
something like this works just fine:
#include <linux/i2c-dev.h>
/* open i2c bus */
if ((file = open("/dev/i2c/0",O_RDWR)) < 0) {
perror("open");
return -1;
}
/* set i2c slave address */
i = 0x28; /* i2c client address */
if (ioctl(file,I2C_SLAVE, i) < 0) {
perror("slave");
return -1;
}
/* write to i2c bus */
if(write(file, buf, strlen(buf)) < 0) {
perror("write");
return -1;
}
while(1) {
/* read from i2c bus */
if(read(file, &c, 1) < 0) {
perror("read");
return -1;
}
fprintf(stderr, "%d: %c\n", c, c);
}
/* close i2c bus */
close(file);
-justin
ho ho wrote:
> Hello. I'm trying write an application program to
> control/program a Philips chip on a PCI card. This
> chip is connected to a BT878 chip which connects to
> the computer with a PCI bus. I would like to control
> the Philips chip using I2C bus(BT878 is master and
> Philips is slave). My question is how can I do it in
> Linux (RedHat 9.0)? Could anyone tell me where I
> should start looking?
>
> I guess I need to control the Philips thru the BT878,
> and I found there's a call "extern int bttv_I2CWrite"
> under bttv.h. Can I just include this bttv.h and call
> this in my application program?
>
> Thank you.
>
>
> hobobcat
>
>
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