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