ASC_STA
return asc_in(port, ASC_STA) & ASC_STA_TE;
return asc_in(port, ASC_STA) & ASC_STA_THE;
u32 status = asc_in(port, ASC_STA);
while ((status = asc_in(port, ASC_STA)) & ASC_STA_RBF) {
status = asc_in(port, ASC_STA);
if (!(asc_in(port, ASC_STA) & ASC_STA_RBF))