On Wed, Sep 20, 2006 at 02:56:41PM +0200, Konstantin Tcholokachvili wrote:
> Hello,
>
> I'm trying to code a module which handles keyboard events (such as: "a
> pressed","a released','ctrl pressed"...).
> It will be useful for a text editor and other event-driven applications.
> But the method I coded return me always the number "1" instead of the
> scancode
> of a key. The code below is inspired by keyboard.asm and hydro3d.asm. I
> modified it again and again but it only returns "1". Can a
> knowledgeable person help me to fix it?
>
> Narke.
>
> ------------------------ begin-------------------------
>
> #include <python2.3/Python.h>
>
> static PyObject *get_scancode(PyObject *self, PyObject *args)
> {
> char scancode;
>
>
> asm volatile(
> "cli\n" /* Clear interruptions */
> "push %%eax\n"
> "push %%ebx\n"
> "xor %%eax,%%eax\n" /* Set eax to zero */
> ".wait4buffer:\n"
> "inb $0x64,%%al\n" /* To know the status of the keyboard */
> "testb $0x01,%%al\n" /* Is the keyboard buffer empty? */
> "jz .wait4buffer\n" /* Yes, wait! */
> "inb $0x60,%%al\n" /* No, let's read the input to get the
> scancode! */
> "pop %%ebx\n"
> "pop %%eax\n"
> "sti\n" /* Set interruptions */
> :"=a"(scancode)
> );
>
> scancode = scancode & 0xff;
>
> return Py_BuildValue("b",scancode);
> }
>
> static PyMethodDef AaaMethods[] = {
> {"get_scancode", get_scancode, METH_VARARGS,"Get the scancode of a
> key"},
> {NULL, NULL, 0, NULL}
> };
>
> void init_aaamodule() {
> Py_InitModule( "aaa", AaaMethods );
> }
>
> ------------------------ end-------------------------
Looks like the asm block pushes eax, reads the scancode into al, and
then pops eax, overwriting the scancode.
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