add circuitpython code

1 files changed, 165 insertions, 0 deletions

diff --git a/circuitpython/shared-module/keypad/KeyMatrix.c b/circuitpython/shared-module/keypad/KeyMatrix.c
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+++ b/circuitpython/shared-module/keypad/KeyMatrix.c
@@ -0,0 +1,165 @@
+/*
+ * This file is part of the Micro Python 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 <string.h>
+
+#include "py/gc.h"
+#include "py/runtime.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "shared-bindings/keypad/EventQueue.h"
+#include "shared-bindings/keypad/KeyMatrix.h"
+#include "shared-bindings/keypad/__init__.h"
+#include "shared-bindings/supervisor/__init__.h"
+#include "shared-bindings/util.h"
+#include "supervisor/port.h"
+#include "supervisor/shared/tick.h"
+
+static void keymatrix_scan_now(void *self_in, mp_obj_t timestamp);
+static size_t keymatrix_get_key_count(void *self_in);
+
+static keypad_scanner_funcs_t keymatrix_funcs = {
+    .scan_now = keymatrix_scan_now,
+    .get_key_count = keymatrix_get_key_count,
+};
+
+static mp_uint_t row_column_to_key_number(keypad_keymatrix_obj_t *self, mp_uint_t row, mp_uint_t column) {
+    return row * self->column_digitalinouts->len + column;
+}
+
+void common_hal_keypad_keymatrix_construct(keypad_keymatrix_obj_t *self, mp_uint_t num_row_pins, const mcu_pin_obj_t *row_pins[], mp_uint_t num_column_pins, const mcu_pin_obj_t *column_pins[], bool columns_to_anodes, mp_float_t interval, size_t max_events) {
+
+    mp_obj_t row_dios[num_row_pins];
+    for (size_t row = 0; row < num_row_pins; row++) {
+        digitalio_digitalinout_obj_t *dio = m_new_obj(digitalio_digitalinout_obj_t);
+        dio->base.type = &digitalio_digitalinout_type;
+        common_hal_digitalio_digitalinout_construct(dio, row_pins[row]);
+        common_hal_digitalio_digitalinout_switch_to_input(dio, columns_to_anodes ? PULL_UP : PULL_DOWN);
+        row_dios[row] = dio;
+    }
+    self->row_digitalinouts = mp_obj_new_tuple(num_row_pins, row_dios);
+
+    mp_obj_t column_dios[num_column_pins];
+    for (size_t column = 0; column < num_column_pins; column++) {
+        digitalio_digitalinout_obj_t *dio = m_new_obj(digitalio_digitalinout_obj_t);
+        dio->base.type = &digitalio_digitalinout_type;
+        common_hal_digitalio_digitalinout_construct(dio, column_pins[column]);
+        common_hal_digitalio_digitalinout_switch_to_input(dio, columns_to_anodes ? PULL_UP : PULL_DOWN);
+        column_dios[column] = dio;
+    }
+    self->column_digitalinouts = mp_obj_new_tuple(num_column_pins, column_dios);
+
+    self->currently_pressed = (bool *)gc_alloc(sizeof(bool) * num_row_pins * num_column_pins, false, false);
+    self->previously_pressed = (bool *)gc_alloc(sizeof(bool) * num_row_pins * num_column_pins, false, false);
+
+    self->columns_to_anodes = columns_to_anodes;
+    self->funcs = &keymatrix_funcs;
+
+    keypad_construct_common((keypad_scanner_obj_t *)self, interval, max_events);
+}
+
+void common_hal_keypad_keymatrix_deinit(keypad_keymatrix_obj_t *self) {
+    if (common_hal_keypad_deinited(self)) {
+        return;
+    }
+
+    // Remove self from the list of active keypad scanners first.
+    keypad_deregister_scanner((keypad_scanner_obj_t *)self);
+
+    for (size_t row = 0; row < common_hal_keypad_keymatrix_get_row_count(self); row++) {
+        common_hal_digitalio_digitalinout_deinit(self->row_digitalinouts->items[row]);
+    }
+    self->row_digitalinouts = MP_ROM_NONE;
+
+    for (size_t column = 0; column < common_hal_keypad_keymatrix_get_column_count(self); column++) {
+        common_hal_digitalio_digitalinout_deinit(self->column_digitalinouts->items[column]);
+    }
+    self->column_digitalinouts = MP_ROM_NONE;
+    common_hal_keypad_deinit_core(self);
+}
+
+size_t common_hal_keypad_keymatrix_get_row_count(keypad_keymatrix_obj_t *self) {
+    return self->row_digitalinouts->len;
+}
+
+size_t common_hal_keypad_keymatrix_get_column_count(keypad_keymatrix_obj_t *self) {
+    return self->column_digitalinouts->len;
+}
+
+mp_uint_t common_hal_keypad_keymatrix_row_column_to_key_number(keypad_keymatrix_obj_t *self, mp_uint_t row, mp_uint_t column) {
+    return row_column_to_key_number(self, row, column);
+}
+
+void common_hal_keypad_keymatrix_key_number_to_row_column(keypad_keymatrix_obj_t *self, mp_uint_t key_number, mp_uint_t *row, mp_uint_t *column) {
+    const size_t num_columns = common_hal_keypad_keymatrix_get_column_count(self);
+    *row = key_number / num_columns;
+    *column = key_number % num_columns;
+}
+
+static size_t keymatrix_get_key_count(void *self_in) {
+    keypad_keymatrix_obj_t *self = self_in;
+    return common_hal_keypad_keymatrix_get_column_count(self) * common_hal_keypad_keymatrix_get_row_count(self);
+}
+
+static void keymatrix_scan_now(void *self_in, mp_obj_t timestamp) {
+    keypad_keymatrix_obj_t *self = self_in;
+
+    // On entry, all pins are set to inputs with a pull-up or pull-down,
+    // depending on the diode orientation.
+    for (size_t row = 0; row < common_hal_keypad_keymatrix_get_row_count(self); row++) {
+        // Switch this row to an output and set level appropriately
+        // Set low if columns_to_anodes is true, else set high.
+        digitalio_digitalinout_obj_t *row_dio = self->row_digitalinouts->items[row];
+        common_hal_digitalio_digitalinout_switch_to_output(
+            row_dio, !self->columns_to_anodes, DRIVE_MODE_PUSH_PULL);
+
+        for (size_t column = 0; column < common_hal_keypad_keymatrix_get_column_count(self); column++) {
+            mp_uint_t key_number = row_column_to_key_number(self, row, column);
+            const bool previous = self->currently_pressed[key_number];
+            self->previously_pressed[key_number] = previous;
+
+            // Get the current state, by reading whether the column got pulled to the row value or not.
+            // If low and columns_to_anodes is true, the key is pressed.
+            // If high and columns_to_anodes is false, the key is pressed.
+            const bool current =
+                common_hal_digitalio_digitalinout_get_value(self->column_digitalinouts->items[column]) !=
+                self->columns_to_anodes;
+            self->currently_pressed[key_number] = current;
+
+            // Record any transitions.
+            if (previous != current) {
+                keypad_eventqueue_record(self->events, key_number, current, timestamp);
+            }
+        }
+
+        // Done with this row. Set its pin to its resting pull value briefly to shorten the time it takes
+        // to switch values. Just switching to an input with a (relatively weak) pullup/pulldown
+        // causes a slight delay in the output changing, which can cause false readings.
+        common_hal_digitalio_digitalinout_set_value(row_dio, self->columns_to_anodes);
+        // Switch the row back to an input, pulled appropriately
+        common_hal_digitalio_digitalinout_switch_to_input(
+            row_dio, self->columns_to_anodes ? PULL_UP : PULL_DOWN);
+    }
+}