From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Tue, 11 Mar 2003 22:23:59 +0000 (+0000)
Subject: make underrun detection play nice with stop_src TRIG_COUNT
X-Git-Tag: r0_7_67x~66
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=2f2720bcc3f8ee6e81ad0500def26ad93251c149;p=comedi.git

make underrun detection play nice with stop_src TRIG_COUNT
---

diff --git a/comedi/drivers/ni_mio_common.c b/comedi/drivers/ni_mio_common.c
index 167c7042..a61bb6ed 100644
--- a/comedi/drivers/ni_mio_common.c
+++ b/comedi/drivers/ni_mio_common.c
@@ -367,6 +367,9 @@ static void mite_handle_b_linkc(struct mite_struct *mite, comedi_device *dev)
 	new_write_count = async->buf_write_count;
 
 	nbytes = mite_bytes_read(mite, AO_DMA_CHAN);
+	if( async->cmd.stop_src == TRIG_COUNT &&
+		(int) (nbytes - async->cmd.stop_arg * sizeof( sampl_t ) ) > 0 )
+		nbytes = async->cmd.stop_arg * sizeof( sampl_t );
 	if( (int)(nbytes - devpriv->last_buf_write_count) > 0 ){
 		rt_printk("ni_mio_common: DMA underrun\n");
 		ni_ao_reset(dev,s);