<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Dear All：<br>1> I found some placeuse two "!!", what's means <br> if(button->gpio != INVALID_GPIO)<br> state = !!((gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low);<br> else<br> state = !!button->adc_state;<br><br>2> is there some MSN group to study linux kernel or discuss it ?<br><br>Thanks and Best Regards<br>
Ben Wu<br>
MSN:crayben@yahoo.cn<br><br></td></tr></table>