ISR_CHK
err = vx_wait_isr_bit(chip, ISR_CHK);
err = vx_wait_isr_bit(chip, ISR_CHK);
err = vx_wait_isr_bit(chip, ISR_CHK);
err = vx_wait_isr_bit(chip, ISR_CHK);
if (vx_check_isr(chip, ISR_CHK, 0, 200) < 0)