keyboard/ergodox/ergodox.c

   1 /*
   2 Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17
  18 This work is heavily based on initial firmware for Ergodox keyboard.
  19 Copyright (c) 2012, 2013 Ben Blazak <benblazak.dev@gmail.com>
  20 Released under The MIT License (see "doc/licenses/MIT.md")
  21 Project located at <https://github.com/benblazak/ergodox-firmware>
  22
  23 Most used files are located at
  24 <https://github.com/benblazak/ergodox-firmware/tree/partial-rewrite/firmware/keyboard/ergodox/controller>
  25
  26 */
  27
  28 #include <stdint.h>
  29 #include <stdbool.h>
  30 #include <avr/io.h>
  31 #include <avr/interrupt.h>
  32 #include <util/delay.h>
  33 #include "action.h"
  34 #include "command.h"
  35 #include "print.h"
  36 #include "debug.h"
  37 #include "ergodox.h"
  38 #include "i2cmaster.h"
  39
  40 bool i2c_initialized = 0;
  41 uint8_t mcp23018_status = 0x20;
  42
  43 bool ergodox_left_led_1 = 0;  // left top
  44 bool ergodox_left_led_2 = 0;  // left middle
  45 bool ergodox_left_led_3 = 0;  // left bottom
  46
  47
  48 void init_ergodox(void)
  49 {
  50     // keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
  51     TCCR1A = 0b10101001;  // set and configure fast PWM
  52     TCCR1B = 0b00001001;  // set and configure fast PWM
  53
  54     // (tied to Vcc for hardware convenience)
  55     DDRB  &= ~(1<<4);  // set B(4) as input
  56     PORTB &= ~(1<<4);  // set B(4) internal pull-up disabled
  57
  58     // unused pins - C7, D4, D5, D7, E6
  59     // set as input with internal pull-ip enabled
  60     DDRC  &= ~(1<<7);
  61     DDRD  &= ~(1<<7 | 1<<5 | 1<<4);
  62     DDRE  &= ~(1<<6);
  63     PORTC |=  (1<<7);
  64     PORTD |=  (1<<7 | 1<<5 | 1<<4);
  65     PORTE |=  (1<<6);
  66 }
  67
  68 void ergodox_blink_all_leds(void)
  69 {
  70     ergodox_led_all_off();
  71     ergodox_led_all_set(LED_BRIGHTNESS_HI);
  72     ergodox_led_all_on();
  73     _delay_ms(333);
  74     ergodox_led_all_off();
  75 }
  76
  77 uint8_t init_mcp23018(void) {
  78     mcp23018_status = 0x20;
  79
  80     // I2C subsystem
  81     if (i2c_initialized == 0) {
  82         i2c_init();  // on pins D(1,0)
  83         i2c_initialized++;
  84         _delay_ms(1000);
  85     }
  86
  87     // set pin direction
  88     // - unused  : input  : 1
  89     // - input   : input  : 1
  90     // - driving : output : 0
  91     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
  92     mcp23018_status = i2c_write(IODIRA);            if (mcp23018_status) goto out;
  93     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
  94     mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
  95     i2c_stop();
  96
  97     // set pull-up
  98     // - unused  : on  : 1
  99     // - input   : on  : 1
 100     // - driving : off : 0
 101     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
 102     mcp23018_status = i2c_write(GPPUA);             if (mcp23018_status) goto out;
 103     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
 104     mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
 105
 106 out:
 107     i2c_stop();
 108
 109     if (!mcp23018_status) mcp23018_status = ergodox_left_leds_update();
 110
 111     return mcp23018_status;
 112 }
 113
 114 uint8_t ergodox_left_leds_update(void) {
 115     if (mcp23018_status) { // if there was an error
 116         return mcp23018_status;
 117     }
 118
 119     // set logical value (doesn't matter on inputs)
 120     // - unused  : hi-Z : 1
 121     // - input   : hi-Z : 1
 122     // - driving : hi-Z : 1
 123     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
 124     mcp23018_status = i2c_write(OLATA);             if (mcp23018_status) goto out;
 125     mcp23018_status = i2c_write(0b11111111
 126             & ~(ergodox_left_led_3<<LEFT_LED_3_SHIFT)
 127           );                                        if (mcp23018_status) goto out;
 128     mcp23018_status = i2c_write(0b11111111
 129             & ~(ergodox_left_led_2<<LEFT_LED_2_SHIFT)
 130             & ~(ergodox_left_led_1<<LEFT_LED_1_SHIFT)
 131           );                                        if (mcp23018_status) goto out;
 132
 133 out:
 134     i2c_stop();
 135     return mcp23018_status;
 136 }