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https://github.com/eddyem/stm32samples.git
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120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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* matrixkbd.c
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* Simple utilite for working with matrix keyboard 3columns x 4rows
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* Don't understand multiple keys!!!
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*
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* Copyright 2015 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "matrixkbd.h"
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extern volatile uint32_t Timer;
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#if !defined(KBD_3BY4) && !defined(KBD_4BY4)
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#error You should define keyboard type: KBD_3BY4 or KBD_4BY4
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#endif
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/*
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* Rows are inputs, columns are outputs
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*/
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#define ROWS 4
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const uint32_t row_ports[ROWS] = {ROW1_PORT, ROW2_PORT, ROW3_PORT, ROW4_PORT};
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const uint16_t row_pins[ROWS] = {ROW1_PIN, ROW2_PIN, ROW3_PIN, ROW4_PIN};
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// symbols[Rows][Columns]
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#if defined(KBD_3BY4)
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#define COLS 3
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const uint32_t col_ports[COLS] = {COL1_PORT, COL2_PORT, COL3_PORT};
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const uint16_t col_pins[COLS] = {COL1_PIN, COL2_PIN, COL3_PIN};
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char kbd[ROWS][COLS] = {
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{'1', '2', '3'},
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{'4', '5', '6'},
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{'7', '8', '9'},
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{'*', '0', '#'}
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};
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#elif defined(KBD_4BY4)
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#define COLS 4
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const uint32_t col_ports[COLS] = {COL1_PORT, COL2_PORT, COL3_PORT, COL4_PORT};
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const uint16_t col_pins[COLS] = {COL1_PIN, COL2_PIN, COL3_PIN, COL4_PIN};
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char kbd[ROWS][COLS] = {
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{'1', '2', '3', 'A'},
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{'4', '5', '6', 'B'},
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{'7', '8', '9', 'C'},
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{'*', '0', '#', 'D'}
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};
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#endif
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uint8_t oldstate[ROWS][COLS];
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/**
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* init keyboard pins: all columns are opendrain outputs
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* all rows are pullup inputs
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*/
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void matrixkbd_init(){
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int i, j;
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rcc_peripheral_enable_clock(&RCC_APB2ENR, KBD_RCC_PORT_CLOCK);
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for(i = 0; i < COLS; ++i){
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gpio_set(col_ports[i], col_pins[i]);
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gpio_set_mode(col_ports[i], GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN,
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col_pins[i]);
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}
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for(i = 0; i < ROWS; ++i){
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gpio_set(row_ports[i], row_pins[i]);
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gpio_set_mode(row_ports[i], GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN,
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row_pins[i]);
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}
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for(j = 0; j < ROWS; ++j)
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for(i = 0; i < COLS; ++i)
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oldstate[j][i] = 1;
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}
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/**
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* Check keyboard
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* if some key pressed, set prsd to its value (symbol)
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* if released - set rlsd to 1
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* works onse per 60ms
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* DON't work with multiple key pressing!
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* In case of simultaneous pressing it will return at first call code of
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* first key met, at second - second and so on
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*/
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void get_matrixkbd(char *prsd, char *rlsd){
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*prsd = 0;
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*rlsd = 0;
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static uint32_t oldTimer = 0;
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if(Timer > oldTimer && Timer - oldTimer < KBD_TIMEOUT) return;
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int r, c;
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for(c = 0; c < COLS; ++c){
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gpio_clear(col_ports[c], col_pins[c]);
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oldTimer = Timer;
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while(oldTimer == Timer); // wait at least one second
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for(r = 0; r < ROWS; ++r){
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uint8_t st = (gpio_get(row_ports[r], row_pins[r])) ? 1 : 0;
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if(oldstate[r][c] != st){ // button state changed
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oldstate[r][c] = st;
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gpio_set(col_ports[c], col_pins[c]);
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if(st == 1){ // released
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*rlsd = 1;
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}else{
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*prsd = kbd[r][c];
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}
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return;
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}
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}
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gpio_set(col_ports[c], col_pins[c]);
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}
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}
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