Hi walter,
On Sun, Mar 16, 2014 at 9:54 AM, walter harms <wha...@bfs.de> wrote:
> Am 16.03.2014 16:52, schrieb milkyway:
> > Hi, I am new to this group. Following is a code I tried from Derek
Malloy's
> > videos, to read the gpio pin values. When I run this program I get
> > "Segmentation fault". I can't make out how it happens. Can anybody help
me
> > out?
...snip...
> > int readButton(int pin)
> > {
> > char setValue[4], GPIOPin[4], GPIODirection[MAX],
GPIOValue[MAX];
> > FILE *GPIOHandler;
> > int i;
> > sprintf(GPIOPin, "%d", pin);
> > sprintf(GPIODirection, "/sys/class/gpio/gpio%s/direction",
GPIOPin);
> > sprintf(GPIOValue, "/sys/class/gpio/gpio%s/value", GPIOPin);
> > if ((GPIOHandler = fopen("/sys/class/gpio/export", "ab")) ==
NULL)
> > {
> > fprintf(stderr, "Failed to export the GPIO\n");
> > return 1;
> > }
> > strcpy(setValue, GPIOPin);
> > fwrite(GPIOPin, sizeof(char), 2, GPIOHandler);
>
> anything bad with
> fprintf(GPIOHandler,"%d",pin) ?
That would probably be better in this situation (less buffer manipulation,
and fprintf to a file won't cause any buffer overruns). Similarly for
writing out the direction below.
--
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com
--
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