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/*
* pit.c -- Periodic Interrupt Timer interface
*
* Copyright (C) 2017 Tomasz Kramkowski <tk@the-tk.com>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include <arrlen.h>
#include <cm4.h>
#include <reg/gpio.h>
#include <reg/pit.h>
#include <reg/port.h>
#include <reg/sim.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "pit.h"
#include "usb/endpt1.h"
#include "usb/keycodes.h"
enum {
T0_CYCLES = 5000,
};
struct gpio {
uint32_t port;
uint32_t gpio;
uint32_t bit;
unsigned char pin;
};
#define GPIO_PIN(port, pin) { \
PORT##port##_BASE, \
GPIO##port##_BASE, \
BV((pin)), \
(pin), \
}
static const struct gpio cols[] = {
GPIO_PIN(B, 2),
GPIO_PIN(B, 3),
GPIO_PIN(B, 18),
GPIO_PIN(B, 19),
GPIO_PIN(C, 0),
GPIO_PIN(C, 8),
GPIO_PIN(C, 9),
GPIO_PIN(C, 10),
GPIO_PIN(C, 11),
};
static const struct gpio rows[] = {
GPIO_PIN(D, 0),
GPIO_PIN(D, 1),
GPIO_PIN(D, 4),
GPIO_PIN(D, 5),
GPIO_PIN(D, 6),
GPIO_PIN(D, 7),
GPIO_PIN(C, 1),
GPIO_PIN(C, 2),
};
/* COL AND ROW SWAPPED!!! */
static enum keycode keymap[ARRLEN(rows)][ARRLEN(cols)] = {
{ /* S01 */ KEY_ESCAPE, KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7, KEY_8, },
{ /* S10 */ KEY_9, KEY_0, KEY_MINUS, KEY_EQUAL, KEY_NONE, KEY_BACKSPACE, KEY_GRAVE, KEY_TAB, KEY_Q, },
{ /* S19 */ KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_U, KEY_I, KEY_O, KEY_P, },
{ /* S28 */ KEY_LSQUARE, KEY_RSQUARE, KEY_NONE, KEY_DELETE, KEY_CAPSLK, KEY_A, KEY_S, KEY_D, KEY_F, },
{ /* S37 */ KEY_G, KEY_H, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON, KEY_QUOTE, KEY_BACKSLASH, KEY_ENTER, },
{ /* S46 */ KEY_PGUP, KEY_LSHIFT, KEY_NU_BACKSLASH, KEY_Z, KEY_X, KEY_C, KEY_V, KEY_B, KEY_N, },
{ /* S55 */ KEY_M, KEY_COMMA, KEY_PERIOD, KEY_SLASH, KEY_RSHIFT, KEY_UP, KEY_PGDN, KEY_LCTRL, KEY_LGUI, },
{ /* S64 */ KEY_LALT, KEY_SPACE, KEY_RALT, KEY_NONE, KEY_RCTRL, KEY_LEFT, KEY_DOWN, KEY_RIGHT, KEY_NONE, },
};
void pit_setup(void)
{
/* Set up ports (could be done with GPC registers */
for (size_t i = 0; i < ARRLEN(cols); i++) {
SET_BIT(GPIO_PDDR(cols[i].gpio), cols[i].pin);
GPIO_PCOR(cols[i].gpio) = cols[i].bit;
PORT_PCR(cols[i].port, cols[i].pin) = BV(PCR_SRE) | BV(PCR_DSE)
| 1 << PCR_MUX;
}
for (size_t i = 0; i < ARRLEN(rows); i++) {
UNSET_BIT(GPIO_PDDR(rows[i].gpio), rows[i].pin);
PORT_PCR(rows[i].port, rows[i].pin) = BV(PCR_PFE) | BV(PCR_PE)
| 1 << PCR_MUX;
}
/* Enable clock */
SET_BIT(SIM_SCGC6, SCGC6_PIT);
/* NVIC Enable interrupt */
ISR_CLRPEND(68);
ISR_SETENA(68);
INTPRI(68) = 0x10;
/* First column strobe */
GPIO_PSOR(cols[0].gpio) = cols[0].bit;
/* Set up PIT0 */
PIT_MCR = 0;
PIT_LDVAL(0) = T0_CYCLES - 1;
PIT_TFLG(0) = BV(TFLG_TIF);
PIT_TCTRL(0) = BV(TCTRL_TIE) | BV(TCTRL_TEN);
}
static uint8_t kstates[ARRLEN(cols)][ARRLEN(rows)] = { 0 };
static void key_state(int col, int row, bool state)
{
uint8_t kstate;
kstate = kstates[col][row] = kstates[col][row] << 1 | state;
if (kstate == 0x7f)
usb_endpt1_setkey(keymap[row][col], true);
else if (kstate == 0x80)
usb_endpt1_setkey(keymap[row][col], false);
}
void pit0_isr(void)
{
static unsigned char col = 0;
for (size_t row = 0; row < ARRLEN(rows); row++)
key_state(col, row, !!(GPIO_PDIR(rows[row].gpio) & rows[row].bit));
GPIO_PCOR(cols[col].gpio) = cols[col].bit;
col = (col + 1) % ARRLEN(cols);
GPIO_PSOR(cols[col].gpio) = cols[col].bit;
if (col == 0)
usb_endpt1_send();
PIT_TFLG(0) = BV(TFLG_TIF);
}
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