Yes I have. Anyway i'm trying to read a value of a register of TVP5150.
Is this the correct way??
if(ioctl(fd, I2C_SLAVE, (0xB8)>>1) < 0) {
fprintf( stderr, "Failed to set slave address: %m\n" );
exit(1);
}
/* Using I2C Read, equivalent of i2c_smbus_read_byte(file) */
if (read(fd, buf, 1) != 1) {
perror("Read");
/* ERROR HANDLING: i2c transaction failed */
} else {
printf("%x",buf[0]);
/* buf[0] contains the read byte */
}
this code is not giving any error but the value being returned is not
correct. Is there
anythng else i need to do!!!!!!!!!!
thanks & regards
yuvraj
---------- Forwarded message ----------
From: Deepika Makhija <[email protected]>
Date: Tue, Sep 22, 2009 at 12:47 PM
Subject: Re: tvp5150 not responding
To: Yuvraj Pasi <[email protected]>
Hi,
Have you allocated the memory for funcs pointer?
or else can you try this
unsigned long funcs;
if(ioctl(fd, I2C_FUNCS, &funcs)<0) {
perror("ioctl");
/* ERROR HANDLING: i2c transaction failed */
}
Regards,
Deepika Makhija
Yuvraj Pasi wrote:
ok Thanks for pointing out my mistake. now it is giving a different error.
i did
unsigned long *funcs;
if(ioctl(fd, I2C_FUNCS, funcs)<0) {
perror("ioctl");
/* ERROR HANDLING: i2c transaction failed */
}
Now it says
ioctl: Bad address
i guess either the address is still incorrect or there is problem with I2C
interface of TVP5150.
thanks & regards
yuvraj
On Tue, Sep 22, 2009 at 11:41 AM, Deepika Makhija <
[email protected]> wrote:
> Hi,
>
> I2C driver accepts 7-bit address so,
>
> Instead of ioctl(fd, I2C_SLAVE, 0xB8) < 0)
> use
> ioctl(fd, I2C_SLAVE, (0xB8 >> 1)) < 0)
>
> Regards,
> Deepika
>
>
>
> Yuvraj Pasi wrote:
>
> Hi,
> I am trying to test tvp5150 with my board from userspace. i have written a
> small program using example given in I2C documentation.
> after opening file
> fd = open ("/dev/i2c/1", O_RDWR );
>
> when i do
> if (ioctl(fd, I2C_SLAVE, 0xB8) < 0)
>
> the system returns
> Failed to set slave address: Invalid argument
>
> the B8 is the I2C address given in the tvp5150 datasheet. is it correct or
> is there somthing i'm missing???
>
>
> thanks & regards
> yuvraj
>
>
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