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/**
* @file keypad.c
* Manages the GPIO keypad
*
* Copyright (C) 2018 Clyne Sullivan
*
* 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 3 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 <https://www.gnu.org/licenses/>.
*/
#include <clock.h>
#include <keypad.h>
#include <gpio.h>
#include <task.h>
#define ROW_0 GPIO_PORT(B, 2)
#define ROW_1 GPIO_PORT(B, 1)
#define ROW_2 GPIO_PORT(B, 15)
#define ROW_3 GPIO_PORT(B, 14)
#define ROW_4 GPIO_PORT(B, 13)
#define ROW_5 GPIO_PORT(C, 4)
#define COL_0 GPIO_PORT(B, 11)
#define COL_1 GPIO_PORT(B, 12)
#define COL_2 GPIO_PORT(A, 11)
#define COL_3 GPIO_PORT(A, 12)
#define COL_4 GPIO_PORT(C, 5)
#define ROWS 6
#define COLS 5
typedef struct {
GPIO_TypeDef *port;
uint16_t pin;
} port_t;
static const port_t keypad_rows[ROWS] = {
{ ROW_0 }, { ROW_1 }, { ROW_2 },
{ ROW_3 }, { ROW_4 }, { ROW_5 }
};
static const port_t keypad_cols[COLS] = {
{ COL_0 }, { COL_1 }, { COL_2 },
{ COL_3 }, { COL_4 }
};
#define K_2ND 0x000000FF
#define K_HOLD 0x000001FF
static const char keypad_map[ROWS * COLS * 4] = {
"\xFF\0\0\0" ">\0\0\0" ">=\0\0" "==\0\0" "=\0\0\0"
"x\0\0\0" "<\0\0\0" "<=\0\0" "!=\0\0" "%\0\0\0"
"7\0\0\0" "8\0\0\0" "9\0\0\0" "(\0\0\0" ")\0\0\0"
"4\0\0\0" "5\0\0\0" "6\0\0\0" "/\0\0\0" "*\0\0\0"
"1\0\0\0" "2\0\0\0" "3\0\0\0" "-\0\0\0" "+\0\0\0"
".\0\0\0" "0\0\0\0" "\0\0\0\0" "\b\0\0\0" "\n\0\0\0"
};
static const char keypad_map_2nd[ROWS * COLS * 4] = {
"a\0\0\0" "b\0\0\0" "c\0\0\0" "d\0\0\0" "e\0\0\0"
"f\0\0\0" "g\0\0\0" "h\0\0\0" "i\0\0\0" "j\0\0\0"
"k\0\0\0" "l\0\0\0" "m\0\0\0" "n\0\0\0" "o\0\0\0"
"p\0\0\0" "q\0\0\0" "r\0\0\0" "s\0\0\0" "t\0\0\0"
"u\0\0\0" "v\0\0\0" "w\0\0\0" "x\0\0\0" "y\0\0\0"
"z\0\0\0" "\0\0\0\0" "\0\0\0\0" "\0\0\0\0" "\xFF\x01\0\0"
};
#define KEY(r, c, i) map[r * COLS * 4 + c * 4 + i]
#define KEYCODE(r, c) *((uint32_t *)(map + (r * COLS * 4 + c * 4)))
#define BUFFER_SIZE 8
static char keypad_buffer[BUFFER_SIZE];
static int keypad_buffer_pos = -1;
void keypad_task(void)
{
unsigned int col = 0;
unsigned char use2nd = 0;
unsigned char hold = 0;
while (1) {
gpio_dout(keypad_cols[col].port, keypad_cols[col].pin, 1);
delay(10);
for (unsigned int row = 0; row < ROWS; row++) {
if (gpio_din(keypad_rows[row].port, keypad_rows[row].pin)) {
char *map = (use2nd == 0) ? keypad_map : keypad_map_2nd;
if (KEYCODE(row, col) == K_2ND) {
use2nd = 1;
} else if (KEYCODE(row, col) == K_HOLD) {
if (use2nd != 0) {
if ((hold ^= 1) == 0)
use2nd = 0;
}
} else if (keypad_buffer_pos < BUFFER_SIZE) {
if (use2nd != 0 && hold == 0)
use2nd = 0;
for (unsigned int i = 0; KEY(row, col, i) != '\0'; i++)
keypad_buffer[++keypad_buffer_pos] = KEY(row, col, i);
}
while (gpio_din(keypad_rows[row].port, keypad_rows[row].pin))
delay(1);
break;
}
}
gpio_dout(keypad_cols[col].port, keypad_cols[col].pin, 0);
col++;
if (col == COLS)
col = 0;
}
}
void keypad_init(void)
{
for (int i = 0; i < ROWS; i++) {
GPIO_TypeDef *p = keypad_rows[i].port;
uint16_t pin = keypad_rows[i].pin;
gpio_mode(p, pin, OUTPUT);
gpio_speed(p, pin, VERYHIGH);
gpio_dout(p, pin, 0);
gpio_mode(p, pin, INPUT);
gpio_pupd(p, pin, PULLDOWN);
}
for (int i = 0; i < COLS; i++) {
GPIO_TypeDef *p = keypad_cols[i].port;
uint16_t pin = keypad_cols[i].pin;
gpio_mode(p, pin, OUTPUT);
gpio_speed(p, pin, VERYHIGH);
gpio_dout(p, pin, 0);
}
}
void keypad_start(void)
{
task_start(keypad_task, 1024);
}
int keypad_get(void)
{
if (keypad_buffer_pos < 0)
return 0;
int key = keypad_buffer[0];
for (int i = 0; i < BUFFER_SIZE - 1; i++)
keypad_buffer[i] = keypad_buffer[i + 1];
keypad_buffer_pos--;
return key;
}
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