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