kopia lustrzana https://github.com/OpenRTX/OpenRTX
211 wiersze
6.8 KiB
C
211 wiersze
6.8 KiB
C
/***************************************************************************
|
|
* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
|
|
* Niccolò Izzo IU2KIN *
|
|
* Frederik Saraci IU2NRO *
|
|
* Silvano Seva IU2KWO *
|
|
* *
|
|
* 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 <stdio.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include <peripherals/gpio.h>
|
|
#include <interfaces/delays.h>
|
|
#include <interfaces/keyboard.h>
|
|
#include <interfaces/platform.h>
|
|
#include <ADC1_MDx.h>
|
|
#include "hwconfig.h"
|
|
|
|
/**
|
|
* \internal
|
|
* Helper function which compares two voltages and tells if they're equal within
|
|
* a 200mV range.
|
|
*
|
|
* @param voltage: voltage to be compared against reference, in mV.
|
|
* @param reference: reference voltage for comparison, in mV.
|
|
* @return true if voltage is equal to reference ± 200mV, false otherwise.
|
|
*/
|
|
bool _compareVoltages(const int voltage, const int reference)
|
|
{
|
|
int difference = voltage - reference;
|
|
if(abs(difference) <= 200) return true;
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Mapping of palmtop mic buttons:
|
|
*
|
|
* +-------+-------+-------+-------+
|
|
* | Col 0 | Col 1 | Col 2 | Col 3 |
|
|
* +-------+-------+-------+-------+-------+
|
|
* | Row 0 | 1 | 2 | 3 | A |
|
|
* +-------+-------+-------+-------+-------+
|
|
* | Row 1 | 4 | 5 | 6 | B |
|
|
* +-------+-------+-------+-------+-------+
|
|
* | Row 2 | 7 | 8 | 9 | C |
|
|
* +-------+-------+-------+-------+-------+
|
|
* | Row 3 | * | 0 | # | D |
|
|
* +-------+-------+-------+-------+-------+
|
|
* | Row 4 | | A/B | UP | DOWN |
|
|
* +-------+-------+-------+-------+-------+
|
|
*
|
|
*/
|
|
|
|
static const uint32_t micKeymap[5][4] =
|
|
{
|
|
{ KEY_1, KEY_2, KEY_3, KEY_F1 },
|
|
{ KEY_4, KEY_5, KEY_6, KEY_F2 },
|
|
{ KEY_7, KEY_8, KEY_9, KEY_ENTER },
|
|
{KEY_STAR, KEY_0, KEY_HASH, KEY_ESC },
|
|
{ 0 , KEY_F5, KEY_UP, KEY_DOWN }
|
|
};
|
|
|
|
|
|
void kbd_init()
|
|
{
|
|
gpio_setMode(KB_COL1, INPUT_PULL_UP);
|
|
gpio_setMode(KB_COL2, INPUT_PULL_UP);
|
|
gpio_setMode(KB_COL3, INPUT_PULL_UP);
|
|
gpio_setMode(KB_COL4, INPUT_PULL_UP);
|
|
|
|
gpio_setMode(KB_ROW1, OUTPUT);
|
|
gpio_setMode(KB_ROW2, OUTPUT);
|
|
gpio_setMode(KB_ROW3, OUTPUT);
|
|
|
|
gpio_setPin(KB_ROW1);
|
|
gpio_setPin(KB_ROW2);
|
|
gpio_setPin(KB_ROW3);
|
|
}
|
|
|
|
void kbd_terminate()
|
|
{
|
|
/* Back to default state */
|
|
gpio_setMode(KB_ROW1, INPUT);
|
|
gpio_setMode(KB_ROW2, INPUT);
|
|
gpio_setMode(KB_ROW3, INPUT);
|
|
}
|
|
|
|
keyboard_t kbd_getKeys()
|
|
{
|
|
keyboard_t keys = 0;
|
|
|
|
/* Use absolute position knob to emulate left and right buttons */
|
|
static uint8_t old_pos = 0;
|
|
uint8_t new_pos = platform_getChSelector();
|
|
if (old_pos != new_pos)
|
|
{
|
|
if (new_pos < old_pos)
|
|
keys |= KEY_LEFT;
|
|
else
|
|
keys |= KEY_RIGHT;
|
|
old_pos = new_pos;
|
|
}
|
|
|
|
/*
|
|
* Mapping of front buttons:
|
|
*
|
|
* +------+-----+-------+-----+
|
|
* | PD0 | PD1 | PE0 | PE1 |
|
|
* +-----+------+-----+-------+-----+
|
|
* | PD2 | ENT | | P1 | P4 |
|
|
* +-----+------+-----+-------+-----+
|
|
* | PD3 | down | | red | P3 |
|
|
* +-----+------+-----+-------+-----+
|
|
* | PD4 | ESC | up | green | P2 |
|
|
* +-----+------+-----+-------+-----+
|
|
*
|
|
* The coloumn lines have pull-up resistors, thus the detection of a button
|
|
* press follows an active-low logic.
|
|
*
|
|
*/
|
|
|
|
gpio_clearPin(KB_ROW1);
|
|
|
|
delayUs(10);
|
|
if(gpio_readPin(KB_COL1) == 0) keys |= KEY_ENTER;
|
|
if(gpio_readPin(KB_COL3) == 0) keys |= KEY_F1;
|
|
if(gpio_readPin(KB_COL4) == 0) keys |= KEY_F4;
|
|
gpio_setPin(KB_ROW1);
|
|
|
|
/* Row 2: button on col. 3 ("red") is not mapped */
|
|
gpio_clearPin(KB_ROW2);
|
|
delayUs(10);
|
|
|
|
if(gpio_readPin(KB_COL1) == 0) keys |= KEY_DOWN;
|
|
if(gpio_readPin(KB_COL4) == 0) keys |= KEY_F3;
|
|
gpio_setPin(KB_ROW2);
|
|
|
|
/* Row 3: button on col. 3 ("green") is not mapped */
|
|
gpio_clearPin(KB_ROW3);
|
|
delayUs(10);
|
|
|
|
if(gpio_readPin(KB_COL1) == 0) keys |= KEY_ESC;
|
|
if(gpio_readPin(KB_COL2) == 0) keys |= KEY_UP;
|
|
if(gpio_readPin(KB_COL4) == 0) keys |= KEY_F2;
|
|
gpio_setPin(KB_ROW3);
|
|
|
|
/*
|
|
* Mapping of palmtop mic row/coloumn voltages:
|
|
* +-------+-------+-------+-------+
|
|
* | Col 0 | Col 1 | Col 2 | Col 3 |
|
|
* +-------+-------+-------+-------+
|
|
* | 700mV | 1300mV| 1900mV| 2600mV|
|
|
* +-------+--------+-------+-------+-------+-------+
|
|
* | Row 0 | 2600mV |
|
|
* +-------+--------+
|
|
* | Row 1 | 2100mV |
|
|
* +-------+--------+
|
|
* | Row 2 | 1500mV |
|
|
* +-------+--------+
|
|
* | Row 3 | 1000mV |
|
|
* +-------+--------+
|
|
* | Row 4 | 500mV |
|
|
* +-------+--------+
|
|
*
|
|
*/
|
|
|
|
/* Retrieve row/coloumn voltage measurements. */
|
|
uint16_t row = ((uint16_t) adc1_getMeasurement(ADC_SW2_CH) + 0.5f);
|
|
uint16_t col = ((uint16_t) adc1_getMeasurement(ADC_SW1_CH) + 0.5f);
|
|
|
|
/* Map row voltage to row index. */
|
|
uint8_t rowIdx = 0xFF;
|
|
if(_compareVoltages(row, 2600)) rowIdx = 0;
|
|
if(_compareVoltages(row, 2100)) rowIdx = 1;
|
|
if(_compareVoltages(row, 1500)) rowIdx = 2;
|
|
if(_compareVoltages(row, 1000)) rowIdx = 3;
|
|
if(_compareVoltages(row, 500)) rowIdx = 4;
|
|
|
|
/* Map col voltage to col index. */
|
|
uint8_t colIdx = 0xFF;
|
|
if(_compareVoltages(col, 700)) colIdx = 0;
|
|
if(_compareVoltages(col, 1300)) colIdx = 1;
|
|
if(_compareVoltages(col, 1900)) colIdx = 2;
|
|
if(_compareVoltages(col, 2600)) colIdx = 3;
|
|
|
|
/*
|
|
* Get corresponding key.
|
|
* Having rowIdx or colIdx equal to 0xFF means that no button on the palmtop
|
|
* key is pressed.
|
|
*/
|
|
if((rowIdx != 0xFF) && (colIdx != 0xFF))
|
|
{
|
|
keys |= micKeymap[rowIdx][colIdx];
|
|
}
|
|
|
|
return keys;
|
|
}
|