int KeyboardUpdate()
{
do
{
if (KeyboardAddress == 0)
{
UsbCheckForChange();
if (KeyboardCount() == 0)
{
KeyboardAddress = 0;
return 0;
}
KeyboardAddress = KeyboardGetAddress(0);
if (KeyboardAddress == 0)
{
return 0;
}
}
int i;
for (i=0; i<6; i++)
{
KeyDown[i] = KeyboardGetKeyDown(KeyboardAddress, i);
}
} while (KeyboardPoll(KeyboardAddress) != 0);
return KeyboardAddress;
}
/*
* keyboard_update
* Based on
* http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/input01.html
*
* 1. Retrieve a stored keyboard address (initially 0).
* 2. If this is not 0, go to 9.
* 3. Call UsbCheckForChange to detect new keyboards.
* 4. Call KeyboardCount to detect how many keyboards are present.
* 5. If this is 0 store the address as 0 and return; we can't do anything with
* no keyboard.
* 6. Call KeyboardGetAddress with parameter 0 to get the first keyboard's
* address.
* 7. Store this address.
* 8. If this is 0, return; there is some problem.
* 9. Call KeyboardGetKeyDown 6 times to get each key currently down and store
* them
* 10. Call KeyboardPoll
* 11. If the result is non-zero go to 3. There is some problem (such as
* disconnected keyboard).
*/
void keyboard_update() {
int keyboard_count;
int i;
do {
if (keyboard_address == 0) {
UsbCheckForChange();
keyboard_count = KeyboardCount();
kprintf("Got %d keyboard\n", keyboard_count);
if (keyboard_count == 0) {
keyboard_address = 0;
kprintf("No keyboard found\n", keyboard_count);
return;
}
keyboard_address = KeyboardGetAddress(0);
if (keyboard_address == 0) {
kprintf("Error! Keyboard address is %d\n", keyboard_address);
return;
}
}
// Call KeyboardGetKeyDown 6 times to get each key currently down and store
// them
for (i = 0; i < 6; i += 1) {
old_keys[i] = KeyboardGetKeyDown(keyboard_address, i);
}
} while (KeyboardPoll(keyboard_address) != 0);
return;
}
unsigned int get_keyboard() {
int keyboard_count;
unsigned int keyboard_addr = 0;
UsbCheckForChange();
keyboard_count = KeyboardCount();
assert(keyboard_count > 0);
keyboard_addr = KeyboardGetAddress(0);
assert(keyboard_addr != 0);
return keyboard_addr;
}
