100 lines
3.9 KiB
C
100 lines
3.9 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2021 Dan Halbert for Adafruit Industries
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "shared-bindings/keypad/Keys.h"
|
|
#include "shared-bindings/keypad/KeyMatrix.h"
|
|
#include "shared-bindings/keypad/ShiftRegisterKeys.h"
|
|
#include "supervisor/shared/lock.h"
|
|
#include "supervisor/shared/tick.h"
|
|
|
|
supervisor_lock_t keypad_scanners_linked_list_lock;
|
|
|
|
void keypad_tick(void) {
|
|
// Fast path. Return immediately there are no scanners.
|
|
if (!MP_STATE_VM(keypad_scanners_linked_list)) {
|
|
return;
|
|
}
|
|
|
|
// Skip scanning if someone else has the lock. Don't wait for the lock.
|
|
if (supervisor_try_lock(&keypad_scanners_linked_list_lock)) {
|
|
mp_obj_t scanner = MP_STATE_VM(keypad_scanners_linked_list);
|
|
while (scanner) {
|
|
if (mp_obj_is_type(scanner, &keypad_keys_type)) {
|
|
keypad_keys_scan((keypad_keys_obj_t *)scanner);
|
|
} else if (mp_obj_is_type(scanner, &keypad_keymatrix_type)) {
|
|
keypad_keymatrix_scan((keypad_keymatrix_obj_t *)scanner);
|
|
} else if (mp_obj_is_type(scanner, &keypad_shiftregisterkeys_type)) {
|
|
keypad_shiftregisterkeys_scan((keypad_shiftregisterkeys_obj_t *)scanner);
|
|
}
|
|
|
|
scanner = ((keypad_scanner_obj_t *)scanner)->next;
|
|
}
|
|
supervisor_release_lock(&keypad_scanners_linked_list_lock);
|
|
}
|
|
}
|
|
|
|
void keypad_reset(void) {
|
|
while (MP_STATE_VM(keypad_scanners_linked_list)) {
|
|
keypad_deregister_scanner(MP_STATE_VM(keypad_scanners_linked_list));
|
|
}
|
|
}
|
|
|
|
// Register a Keys, KeyMatrix, etc. that will be scanned in the background
|
|
void keypad_register_scanner(keypad_scanner_obj_t *scanner) {
|
|
supervisor_acquire_lock(&keypad_scanners_linked_list_lock);
|
|
scanner->next = MP_STATE_VM(keypad_scanners_linked_list);
|
|
MP_STATE_VM(keypad_scanners_linked_list) = scanner;
|
|
supervisor_release_lock(&keypad_scanners_linked_list_lock);
|
|
|
|
// One more request for ticks.
|
|
supervisor_enable_tick();
|
|
}
|
|
|
|
// Remove scanner from the list of active scanners.
|
|
void keypad_deregister_scanner(keypad_scanner_obj_t *scanner) {
|
|
// One less request for ticks.
|
|
supervisor_disable_tick();
|
|
|
|
supervisor_acquire_lock(&keypad_scanners_linked_list_lock);
|
|
if (MP_STATE_VM(keypad_scanners_linked_list) == scanner) {
|
|
// Scanner is at the front; splice it out.
|
|
MP_STATE_VM(keypad_scanners_linked_list) = scanner->next;
|
|
scanner->next = NULL;
|
|
} else {
|
|
keypad_scanner_obj_t *current = MP_STATE_VM(keypad_scanners_linked_list);
|
|
while (current) {
|
|
if (current->next == scanner) {
|
|
// Splice myself out.
|
|
current->next = scanner->next;
|
|
scanner->next = NULL;
|
|
break;
|
|
}
|
|
current = current->next;
|
|
}
|
|
}
|
|
supervisor_release_lock(&keypad_scanners_linked_list_lock);
|
|
}
|