This patch is ported over by me (Ian Abbott) from the out-of-tree Comedi
git repository at "git://comedi.org/git/comedi/comedi.git".
The original patch is by Nicholas Nell.
The patch adds support for trailing (falling) edge external triggers for
scans in asynchronous command support in the ni_pcidio driver. This is
supported at least on the PCI-DIO_32HS and PCI-6533 boards; not sure
about the other boards.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Nicholas Nell <nicholas.nell@xxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/ni_pcidio.c | 19 +++++++++++++++----
1 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_pcidio.c b/drivers/staging/comedi/drivers/ni_pcidio.c
index c258059..9c44075 100644
--- a/drivers/staging/comedi/drivers/ni_pcidio.c
+++ b/drivers/staging/comedi/drivers/ni_pcidio.c
@@ -30,7 +30,7 @@ Status: works
Devices: [National Instruments] PCI-DIO-32HS (ni_pcidio), PXI-6533,
PCI-DIO-96, PCI-DIO-96B, PXI-6508, PCI-6503, PCI-6503B, PCI-6503X,
PXI-6503, PCI-6533, PCI-6534
-Updated: Sun, 21 Apr 2002 21:03:38 -0700
+Updated: Mon, 09 Jan 2012 14:27:23 +0000
The DIO-96 appears as four 8255 subdevices. See the 8255
driver notes for details.
@@ -42,6 +42,11 @@ supports simple digital I/O; no handshaking is supported.
DMA mostly works for the PCI-DIO32HS, but only in timed input mode.
+The PCI-DIO-32HS/PCI-6533 has a configurable external trigger. Setting
+scan_begin_arg to 0 or CR_EDGE triggers on the leading edge. Setting
+scan_begin_arg to CR_INVERT or (CR_EDGE | CR_INVERT) triggers on the
+trailing edge.
+
This driver could be easily modified to support AT-MIO32HS and
AT-MIO96.
@@ -847,8 +852,8 @@ static int ni_pcidio_cmdtest(struct comedi_device *dev,
} else {
/* TRIG_EXT */
/* should be level/edge, hi/lo specification here */
- if (cmd->scan_begin_arg != 0) {
- cmd->scan_begin_arg = 0;
+ if ((cmd->scan_begin_arg & ~(CR_EDGE | CR_INVERT)) != 0) {
+ cmd->scan_begin_arg &= (CR_EDGE | CR_INVERT);
err++;
}
}
@@ -963,7 +968,13 @@ static int ni_pcidio_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
writeb(0, devpriv->mite->daq_io_addr + Sequence);
writeb(0x00, devpriv->mite->daq_io_addr + ReqReg);
writeb(4, devpriv->mite->daq_io_addr + BlockMode);
- writeb(0, devpriv->mite->daq_io_addr + LinePolarities);
+ if (!(cmd->scan_begin_arg & CR_INVERT)) {
+ /* Leading Edge pulse mode */
+ writeb(0, devpriv->mite->daq_io_addr + LinePolarities);
+ } else {
+ /* Trailing Edge pulse mode */
+ writeb(2, devpriv->mite->daq_io_addr + LinePolarities);
+ }
writeb(0x00, devpriv->mite->daq_io_addr + AckSer);
writel(1, devpriv->mite->daq_io_addr + StartDelay);
writeb(1, devpriv->mite->daq_io_addr + ReqDelay);
--
1.7.8.2
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