The code I included was code I used to control an i2c display plugged
into my bt848 based capture card, on the bt848 i2c bus.
The Linux i2c layer is generic, and can be used for any i2c bus on the
system.
-justin
ho ho wrote:
> Dear Justin Schoeman:
>
> Thank you very much for your information. I took a
> look at the web site of LM_Sensors project and found
> that they control the componts on a motherboard using
> I2C. I wonder if it makes any different in I2C
> control between directly on motherboard and thru PCI
> under Linux?
>
> Thanks again for your time and help.
>
> hobobcat
>
> --- Justin Schoeman <justin@xxxxxxxxxxxxxxxxxxxx>
> 的郵件內容：> 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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