hw_counter = comedi_8254_read(devpriv->counter, 1);
/* make sure hardware counter reading is not bogus due to initial value
* not having been loaded yet */
- if (devpriv->adc_count == 0 && hw_counter == devpriv->initial_hw_count) {
+ if (devpriv->adc_count == 0 &&
+ hw_counter == devpriv->initial_hw_count) {
num_samples = 0;
} else {
- /* The calculation of num_samples looks odd, but it uses the following facts.
- * 16 bit hardware counter is initialized with value of zero (which really
- * means 0x1000). The counter decrements by one on each conversion
- * (when the counter decrements from zero it goes to 0xffff). num_samples
- * is a 16 bit variable, so it will roll over in a similar fashion to the
- * hardware counter. Work it out, and this is what you get. */
+ /* The calculation of num_samples looks odd, but it uses the
+ * following facts. 16 bit hardware counter is initialized with
+ * value of zero (which really means 0x1000). The counter
+ * decrements by one on each conversion (when the counter
+ * decrements from zero it goes to 0xffff). num_samples is a
+ * 16 bit variable, so it will roll over in a similar fashion
+ * to the hardware counter. Work it out, and this is what you
+ * get. */
num_samples = -hw_counter - devpriv->adc_count;
}
/* check if we only need some of the points */