Support for Lightpad keypad

keyboard/lightpad/matrix.c

@@ -0,0 +1,205 @@
+/*
+Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "matrix.h"
+#include "eeconfig.h"
+#include "action_layer.h"
+#include "backlight.h"
+
+#ifndef DEBOUNCE
+#   define DEBOUNCE 0
+#endif
+static uint8_t debouncing = DEBOUNCE;
+
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static uint8_t read_rows(void);
+static uint8_t read_fwkey(void);
+static void init_rows(void);
+static void unselect_cols(void);
+static void select_col(uint8_t col);
+
+inline
+uint8_t matrix_rows(void)
+{
+    return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+    return MATRIX_COLS;
+}
+
+void misc_init(void) {
+}
+
+void matrix_init(void)
+{
+    backlight_init_ports();
+    unselect_cols();
+    init_rows();
+    for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
+        matrix[i] = 0;
+        matrix_debouncing[i] = 0;
+    }
+}
+
+uint8_t matrix_scan(void)
+{
+    for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+        select_col(col);
+        _delay_us(3);
+        uint8_t rows = read_rows();
+        // Use the otherwise unused col: 0 row: 0 for firmware key
+        if(col == 0) {
+            rows |= read_fwkey();
+        }
+        for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+            bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
+            bool curr_bit = rows & (1<<row);
+            if (prev_bit != curr_bit) {
+                matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
+                if (debouncing) {
+                    dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
+                }
+                debouncing = DEBOUNCE;
+            }
+        }
+        unselect_cols();
+    }
+
+    if (debouncing) {
+        if (--debouncing) {
+            _delay_ms(1);
+        } else {
+            for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+                matrix[i] = matrix_debouncing[i];
+            }
+        }
+    }
+
+    return 1;
+}
+
+bool matrix_is_modified(void)
+{
+    if (debouncing) return false;
+    return true;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & ((matrix_row_t)1<<col));
+}
+
+inline
+matrix_row_t matrix_get_row(uint8_t row)
+{
+    return matrix[row];
+}
+
+void matrix_print(void)
+{
+    print("\nr/c 0123456789ABCDEF\n");
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
+    }
+}
+
+uint8_t matrix_key_count(void)
+{
+    uint8_t count = 0;
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        count += bitpop32(matrix[i]);
+    }
+    return count;
+}
+
+/* Row configuration
+ *
+ * row: 0    1    2    3    4    5
+ * pin: PD0  PD1  PD2  PD3  PD5  PB7
+ *
+ * Firmware uses pin PE2
+ */
+static void init_rows(void)
+{
+    DDRD  &= ~0b00101111;
+    PORTD |=  0b00101111;
+
+    DDRB  &= ~0b10000000;
+    PORTB |=  0b10000000;
+
+    DDRE  &= ~0b00000100;
+    PORTE |=  0b00000100;
+}
+
+static uint8_t read_rows(void)
+{
+    return (PIND&(1<<0) ? (1<<0) : 0) |
+           (PIND&(1<<1) ? (1<<1) : 0) |
+           (PIND&(1<<2) ? (1<<2) : 0) |
+           (PIND&(1<<3) ? (1<<3) : 0) |
+           (PIND&(1<<5) ? (1<<4) : 0) |
+           (PINB&(1<<7) ? (1<<5) : 0);
+}
+
+static uint8_t read_fwkey(void)
+{
+    return PINE&(1<<2) ? 0 : (1<<0);
+}
+
+/* Column configuration
+ *
+ * col: 0    1    2    3
+ * pin: PF0  PF1  PC7  PC6
+ */
+static void unselect_cols(void)
+{
+    DDRF |=   0b00000011;
+    PORTF &= ~0b00000011;
+    DDRC |=   0b11000000;
+    PORTC &= ~0b11000000;
+}
+
+static void select_col(uint8_t col)
+{
+    switch (col) {
+        case 0:
+            PORTF |= (1<<0);
+            break;
+        case 1:
+            PORTF |= (1<<1);
+            break;
+        case 2:
+            PORTC |= (1<<7);
+            break;
+        case 3:
+            PORTC |= (1<<6);
+            break;
+    }
+}