tweak

diff --git a/comedi/drivers/das1800.c b/comedi/drivers/das1800.c
index 539ae0c6d75e502c6428dceb12d1d5ba844fa96f..e18d3a3bfc2d87c6a01d15ecae3db1f465465e11 100644 (file)
--- a/comedi/drivers/das1800.c
+++ b/comedi/drivers/das1800.c
@@ -1506,7 +1506,7 @@ static int das1800_ai_do_cmd(comedi_device *dev, comedi_subdevice *s)
                devpriv->count = cmd.stop_arg * cmd.chanlist_len;
                devpriv->forever = 0;
                /* if they want just a few points, interrupt fifo not empty */
-               if(cmd.stop_arg < HALF_FIFO)
+               if(cmd.stop_arg * cmd.scan_end_arg < HALF_FIFO)
                        devpriv->irq_dma_bits &= ~FIMD;
        }else
        {
@@ -1768,8 +1768,8 @@ unsigned int suggest_transfer_size(comedi_device *dev, unsigned long ns)
        float freq = 1000000000.0 / ns;
        const int min_transfer = 1024;  // minimum transfer size in bytes
 
-       // make buffer fill in no more than 1 second
-       size = (int)freq * sizeof(sampl_t);
+       // make buffer fill in no more than 1/3 second
+       size = ((int)freq * sizeof(sampl_t)) / 3;
 
        // set a minimum and maximum size allowed
        if(size > devpriv->dma_buf_max_size)