101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
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/*
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* This file is part of the Black Magic Debug project.
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*
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* Copyright (C) 2015 Black Sphere Technologies Ltd.
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* Written by Gareth McMullin <gareth@blacksphere.co.nz>
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "general.h"
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#include "morse.h"
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/* Morse code patterns and lengths */
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static const struct {
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uint16_t code;
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uint8_t bits;
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} morse_letter[] = {
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{ 0b00011101, 8}, // 'A' .-
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{ 0b000101010111, 12}, // 'B' -...
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{ 0b00010111010111, 14}, // 'C' -.-.
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{ 0b0001010111, 10}, // 'D' -..
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{ 0b0001, 4}, // 'E' .
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{ 0b000101110101, 12}, // 'F' ..-.
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{ 0b000101110111, 12}, // 'G' --.
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{ 0b0001010101, 10}, // 'H' ....
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{ 0b000101, 6}, // 'I' ..
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{0b0001110111011101, 16}, // 'J' .---
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{ 0b000111010111, 12}, // 'K' -.-
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{ 0b000101011101, 12}, // 'L' .-..
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{ 0b0001110111, 10}, // 'M' --
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{ 0b00010111, 8}, // 'N' -.
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{ 0b00011101110111, 14}, // 'O' ---
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{ 0b00010111011101, 14}, // 'P' .--.
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{0b0001110101110111, 16}, // 'Q' --.-
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{ 0b0001011101, 10}, // 'R' .-.
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{ 0b00010101, 8}, // 'S' ...
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{ 0b000111, 6}, // 'T' -
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{ 0b0001110101, 10}, // 'U' ..-
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{ 0b000111010101, 12}, // 'V' ...-
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{ 0b000111011101, 12}, // 'W' .--
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{ 0b00011101010111, 14}, // 'X' -..-
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{0b0001110111010111, 16}, // 'Y' -.--
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{ 0b00010101110111, 14}, // 'Z' --..
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};
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const char *morse_msg;
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static const char * volatile morse_ptr;
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static char morse_repeat;
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void morse(const char *msg, char repeat)
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{
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morse_msg = morse_ptr = msg;
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morse_repeat = repeat;
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}
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bool morse_update(void)
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{
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static uint16_t code;
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static uint8_t bits;
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if (!morse_ptr)
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return false;
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if (!bits) {
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char c = *morse_ptr++;
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if (!c) {
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if(morse_repeat) {
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morse_ptr = morse_msg;
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c = *morse_ptr++;
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} else {
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morse_ptr = 0;
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return false;
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}
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}
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if ((c >= 'A') && (c <= 'Z')) {
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c -= 'A';
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code = morse_letter[c].code;
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bits = morse_letter[c].bits;
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} else {
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code = 0; bits = 4;
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}
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}
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bool ret = code & 1;
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code >>= 1;
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bits--;
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return ret;
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}
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