u8glib 1.11 function SleepOn don't work.

Hi, Oliver:

I found the function at file u8g_ll_api.c and the syntax are:

void u8g_SleepOn(u8g_t *u8g)
{
  u8g_call_dev_fn(u8g, u8g->dev, U8G_DEV_MSG_SLEEP_ON, NULL);
}

void u8g_SleepOff(u8g_t *u8g)
{
  u8g_call_dev_fn(u8g, u8g->dev, U8G_DEV_MSG_SLEEP_OFF, NULL);
}

In te reference we have SleepOn and SleepOff not u8g_SleepOn and u8g_SleepOff. Maybe this is the matter?

I'll try later at home and i'll say you something.