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Hello everyone,
I'm trying to implement a simple I/O-Interfaceboard with a FTDI4232 chip. For that I'm opening the connection with FDTI::Context::open(<my product ID>, <my vendor ID>). The function returns 0, i.e. indicating that the call was successful. But when I'm calling
FDTI::Context::is_open() later it returns false.
After some investigation I found that FDTI::Context::open(<my product ID>, <my vendor ID>) calls get_strings_and_reopen(false,false,false). But for all parameters false there is no change to set the internal d->open flag for indicating the device to open. Moving
the setting of d->open to the end of the function get_strings_and_reopen removes that problem:
diff --git a/ftdipp/ftdi.cpp b/ftdipp/ftdi.cpp
index afb84fb..d89d842 100644
--- a/ftdipp/ftdi.cpp
+++ b/ftdipp/ftdi.cpp
@@ -398,9 +398,10 @@ int Context::get_strings_and_reopen(bool vendor, bool description, bool serial)
// Reattach device
ret = ftdi_usb_open_dev(d->ftdi, d->dev);
- d->open = (ret >= 0);
}
+ d->open = (ret >= 0);
+
return ret;
}
Or the workaround I did also removed the problem: Just using FDTI::Context::open("i:<my product ID>: <my vendor ID>"), since this calls get_strings_and_reopen(false,true,false) and this
set then the d->open flag correctly and also the FDTI::Context::is_open() works then.
Is this right or I'm missing some assumptions?
Greetings,
André
PS: Also a bit strange was that there is no usage of FDTI::Context::is_open() in the examples. If needed I
will support you in doing further tests.
Richard
Wolf GmbH, Pforzheimer Strasse 32, 75438 Knittlingen
Managing Directors: Juergen Pfab, Juergen Steinbeck. Trade Register: Mannheim
HRB 510031
Richard
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