90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/* Copyright 2014 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*
|
|
* Raw keyboard I/O layer for nRF51
|
|
*
|
|
* To make this code portable, we rely heavily on looping over the keyboard
|
|
* input and output entries in the board's gpio_list[]. Each set of inputs or
|
|
* outputs must be listed in consecutive, increasing order so that scan loops
|
|
* can iterate beginning at KB_IN00 or KB_OUT00 for however many GPIOs are
|
|
* utilized (KEYBOARD_ROWS or KEYBOARD_COLS_MAX).
|
|
*/
|
|
|
|
#include "gpio.h"
|
|
#include "keyboard_config.h"
|
|
#include "keyboard_raw.h"
|
|
#include "keyboard_scan.h"
|
|
#include "registers.h"
|
|
#include "task.h"
|
|
#include "util.h"
|
|
|
|
/* Mask of output pins for driving. */
|
|
static unsigned int col_mask;
|
|
|
|
void keyboard_raw_init(void)
|
|
{
|
|
int i;
|
|
|
|
/* Initialize col_mask */
|
|
col_mask = 0;
|
|
for (i = 0; i < keyboard_cols; i++)
|
|
col_mask |= gpio_list[GPIO_KB_OUT00 + i].mask;
|
|
|
|
/* Ensure interrupts are disabled */
|
|
keyboard_raw_enable_interrupt(0);
|
|
}
|
|
|
|
void keyboard_raw_task_start(void)
|
|
{
|
|
/*
|
|
* Enable the interrupt for keyboard matrix inputs.
|
|
* One is enough, since they are shared.
|
|
*/
|
|
gpio_enable_interrupt(GPIO_KB_IN00);
|
|
}
|
|
|
|
test_mockable void keyboard_raw_drive_column(int out)
|
|
{
|
|
/* tri-state all first */
|
|
NRF51_GPIO0_OUTSET = col_mask;
|
|
|
|
/* drive low for specified pin(s) */
|
|
if (out == KEYBOARD_COLUMN_ALL)
|
|
NRF51_GPIO0_OUTCLR = col_mask;
|
|
else if (out != KEYBOARD_COLUMN_NONE)
|
|
NRF51_GPIO0_OUTCLR = gpio_list[GPIO_KB_OUT00 + out].mask;
|
|
}
|
|
|
|
test_mockable int keyboard_raw_read_rows(void)
|
|
{
|
|
int i;
|
|
int state = 0;
|
|
|
|
for (i = 0; i < KEYBOARD_ROWS; i++) {
|
|
if (NRF51_GPIO0_IN & gpio_list[GPIO_KB_IN00 + i].mask)
|
|
state |= 1 << i;
|
|
}
|
|
|
|
/* Invert it so 0=not pressed, 1=pressed */
|
|
return state ^ 0xff;
|
|
}
|
|
|
|
void keyboard_raw_enable_interrupt(int enable)
|
|
{
|
|
if (enable) {
|
|
/*
|
|
* Clear the PORT event before enabling the interrupt.
|
|
*/
|
|
NRF51_GPIOTE_PORT = 0;
|
|
NRF51_GPIOTE_INTENSET = 1 << NRF51_GPIOTE_PORT_BIT;
|
|
} else {
|
|
NRF51_GPIOTE_INTENCLR = 1 << NRF51_GPIOTE_PORT_BIT;
|
|
}
|
|
}
|
|
|
|
void keyboard_raw_gpio_interrupt(enum gpio_signal signal)
|
|
{
|
|
task_wake(TASK_ID_KEYSCAN);
|
|
}
|