On Mon, 9 Sep 2013, Phil Dibowitz wrote:
> OK, here's a (hopefully) final version.
>
> There's a few autoconf/automake tweaks for MacOSX since the last version.
> Removed some debug code, and updated the Linux and Mac docs.
>
> Have you had any success making hidapi-raw work on Windows?
No, I have not. I haven't tried yet - I will, though. Ideally, I would
like to get the Windows build working through MinGW, so we could easily
cross compile the Windows build from Linux.
Okay, so I did some review and testing of your latest patch. Comments
below.
> Note that on Linux you can use libhidapi-hidraw (the raw internal
> implementation), or libhidapi-libusb (uses libusb internally), but we
> use libusb becuase the hidraw is unstable at this point. On other
> platforms, only the respective native HID implementations are
I don't think the hidraw implementation is necessarily buggy on Linux - I
think it would just have required kernel changes to make it work with our
devices.
> -AC_CONFIG_HEADERS([config.h])
Any particular reason why you removed this from libconcord/configure.ac?
Not that I noticed a problem - I just noticed that there are a bunch more
-Dxxyyzz arguments on compilation commands (vice having all the defines
written to config.h). Just curious, mainly.
> +int HID_WriteReport(const uint8_t *data)
> +{
> + int err = hid_write(h_dev, data, USB_PACKET_LENGTH);
> + if (err < 0) {
> + debug("Failed to write to device: %d (%s)", err, hid_error(h_dev));
> + return err;
> + }
> +
> + return 0;
> +}
I found a pretty substantial bug here. It turns out that hid_write
requires that you pass it a 'Report ID' as the first byte - so we actually
need to pass in a buffer of USB_PACKET_LENGTH + 1, and set the first byte
to zero. So, here we'll probably have to copy the input data into a
larger buffer, and pass that on. Because of the way hid_write() works,
this bug is only seen when we send a packet that starts with 0x00. (See
the hidapi.h header file for more info on the 'Report ID' requirement.)
> + debug("Failed to write to device: %d (%s)", err, hid_error(h_dev));
> + debug("Failed to read from device: %d (%s)", err, hid_error(h_dev));
I think both of these should actually use %ls instead of %s because
hid_error returns a wchar_t*.
Scott
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