vx_wait_isr_bit
#define vx_wait_for_rx_full(chip) vx_wait_isr_bit(chip, ISR_RX_FULL)
err = vx_wait_isr_bit(chip, ISR_CHK);
err = vx_wait_isr_bit(chip, ISR_TX_EMPTY);
err = vx_wait_isr_bit(chip, ISR_CHK);
err = vx_wait_isr_bit(chip, ISR_TX_READY);
err = vx_wait_isr_bit(chip, ISR_TX_READY);
err = vx_wait_isr_bit(chip, ISR_CHK);
if (vx_wait_isr_bit(chip, ISR_TX_EMPTY) < 0) {
if (vx_wait_isr_bit(chip, ISR_TX_EMPTY) < 0) {
err = vx_wait_isr_bit(chip, ISR_TX_EMPTY);
err = vx_wait_isr_bit(chip, ISR_CHK);
if (vx_wait_isr_bit(_chip, ISR_TX_EMPTY) < 0)