On Tuesday, 4. October 2011 18:49:26 Uwe Bonnes wrote:
> Please use "if (ftdi->usb_dev && ftdi->index != interface)" for the sake
> of simplicity.
How about this one, does it represent your original idea?
-----------------------------------------------------
Based upon code from Uwe Bonnes, improved by me.
---
src/ftdi.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/src/ftdi.c b/src/ftdi.c
index 1f45e95..59a9eea 100644
--- a/src/ftdi.c
+++ b/src/ftdi.c
@@ -149,12 +149,23 @@ struct ftdi_context *ftdi_new(void)
\retval 0: all fine
\retval -1: unknown interface
\retval -2: USB device unavailable
+ \retval -3: Device already open, interface can't be set in that state
*/
int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface
interface)
{
if (ftdi == NULL)
ftdi_error_return(-2, "USB device unavailable");
+ if (ftdi->usb_dev != NULL)
+ {
+ int check_interface = interface;
+ if (check_interface == INTERFACE_ANY)
+ check_interface = INTERFACE_A;
+
+ if (ftdi->index != check_interface)
+ ftdi_error_return(-3, "Interface can not be changed on an already
open device");
+ }
+
switch (interface)
{
case INTERFACE_ANY:
--
1.7.4.4
--
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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