KCS_STATUS_IBF
while (status & KCS_STATUS_IBF) {
while (status & KCS_STATUS_IBF) {
while (status & KCS_STATUS_IBF) {
while (status & KCS_STATUS_IBF) {
while (ticks - start < MAX_TIMEOUT && status & KCS_STATUS_IBF) {
!(status & KCS_STATUS_IBF)) {