That did the trick!
Have you hacked up your EVM yet to see if it works as an 'IN' yet? Im
considering my options for adding a button!
Andrew
On Wed, 2006-10-11 at 14:26 +0200, Lorenzo Lutti wrote:
> From: "Andrew Armstrong" <[EMAIL PROTECTED]>
>
> > I am trying to compile a pretty simple program that
> > supposedly will
> > flash some of the EVM's LEDS (Basic I2C interfacing).
> >
> > When I try to compile this on either the EMV or via the
> > crosscompiler on
> > my host machine I get a several screenfuls of complaints.
>
> The complaints come from <linux/i2c.h>, probably the correct user library
> uses other headers. You can skip any user library by accessing the device
> directly; try the following code:
>
> #include <stdio.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <string.h>
> #include <sys/ioctl.h>
> #include <errno.h>
> #include <signal.h>
>
> #define I2C_DEVICE "/dev/i2c/0"
> #define I2C_DEV_ADDR 0x38
> #define I2C_SLAVE 0x0703
>
> int main( int argc, char *argv[])
> {
> int i2c_fd;
> unsigned char val = 0xFE;
> int ret;
> struct timespec req = {
> .tv_sec = 0,
> .tv_nsec = 100000000,
> };
>
> if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
> {
> printf( "Unable to open the i2c port!\n");
> return 100;
> }
> if( ioctl( i2c_fd, I2C_SLAVE, I2C_DEV_ADDR) == -1)
> {
> close( i2c_fd);
> printf( "Unable to setup the i2c port!\n");
> return 101;
> }
>
> do
> {
> val <<= 1;
> val |= 0x01;
> if( val == 0xFF)
> {
> val = 0xFE;
> }
> write( i2c_fd, &val, 1);
> } while( !nanosleep( &req, NULL));
>
> close( i2c_fd);
> printf( "End.\n");
> return 0;
> }
>
>
> Cheers, Lorenzo
>
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