2 * keyboard firmware based on PJRC USB keyboard example
4 /* Keyboard example with debug channel, for Teensy USB Development Board
5 * http://www.pjrc.com/teensy/usb_keyboard.html
6 * Copyright (c) 2008 PJRC.COM, LLC
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29 #include <avr/pgmspace.h>
30 #include <avr/interrupt.h>
31 #include <util/delay.h>
33 #include "usb_device.h"
37 #include "jump_bootloader.h"
39 #define LED_CONFIG (DDRD |= (1<<6))
40 #define LED_ON (PORTD &= ~(1<<6))
41 #define LED_OFF (PORTD |= (1<<6))
42 #define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
44 static void print_matrix(void);
47 uint16_t idle_count=0;
53 bool modified = false;
54 bool has_ghost = false;
55 uint8_t key_index = 0;
57 // set for 16 MHz clock
63 // Initialize the USB, and then wait for the host to set configuration.
64 // If the Teensy is powered without a PC connected to the USB port,
65 // this will wait forever.
67 while (!usb_configured()) /* wait */ ;
69 // Wait an extra second for the PC's operating system to load drivers
70 // and do whatever it does to actually be ready for input
73 // Configure timer 0 to generate a timer overflow interrupt every
74 // 256*1024 clock cycles, or approx 61 Hz when using 16 MHz clock
75 // This demonstrates how to use interrupts to implement a simple
76 // inactivity timeout.
81 print("firmware 0.2 for t.m.k.\n");
90 modified = matrix_is_modified();
91 has_ghost = matrix_has_ghost();
93 // doesnt send keys during ghost occurs
94 if (modified && !has_ghost) {
96 keyboard_modifier_keys = 0;
97 for (int i = 0; i < 6; i++) keyboard_keys[i] = KB_NO;
99 for (int row = 0; row < MATRIX_ROWS; row++) {
100 for (int col = 0; col < MATRIX_COLS; col++) {
101 if (matrix[row] & 1<<col) continue;
103 uint8_t code = get_keycode(layer, row, col);
106 } else if (KB_LCTRL <= code && code <= KB_RGUI) {
107 // modifier keycode: 0xE0-0xE7
108 keyboard_modifier_keys |= 1<<(code & 0x07);
111 keyboard_keys[key_index] = code;
117 // run bootloader when 4 left modifier keys down
118 if (keyboard_modifier_keys == (MOD_LCTRL | MOD_LSHIFT | MOD_LALT | MOD_LGUI)) {
120 keyboard_modifier_keys = 0;
121 for (int i = 0; i < 6; i++) keyboard_keys[i] = KB_NO;
124 print("jump to bootloader...\n");
136 // variables shared with interrupt routines must be
137 // accessed carefully so the interrupt routine doesn't
138 // try to use the variable in the middle of our access
144 // print matrix state for debug
154 // print counts for debug
155 if ((loop_count % 0x1000) == 0) {
157 print("idle_count: "); phex((idle_count & 0xFF00) >> 8); phex(idle_count & 0xFF); print("\n");
158 print("loop_count: "); phex((loop_count & 0xFF00) >> 8); phex(loop_count & 0xFF); print("\n");
162 // teensy LED flush for debug
163 if ((loop_count & 0x100) == 0) {
169 // now the current pins will be the previous, and
170 // wait a short delay so we're not highly sensitive
171 // to mechanical "bounce".
177 static void print_matrix(void) {
178 print("\nr/c 01234567\n");
179 for (int row = 0; row < MATRIX_ROWS; row++) {
180 phex(row); print(": ");
181 pbin_reverse(matrix[row]);
182 if (matrix_has_ghost_in_row(row)) {
188 for (int i = 0; i < 6; i++) { phex(keyboard_keys[i]); print(" "); }
190 print("mod: "); phex(keyboard_modifier_keys); print("\n");
193 // This interrupt routine is run approx 61 times per second.
194 // A very simple inactivity timeout is implemented, where we
195 // will send a space character and print a message to the
196 // hid_listen debug message window.