91 lines
3.7 KiB
C
91 lines
3.7 KiB
C
#include <util/delay.h>
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#include <string.h>
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#include "morse.h"
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/* TODO: all of this is a candidate for living in an EEPROM */
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typedef struct morse_codepoint {
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size_t length;
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uint8_t values[5];
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} morse_codepoint_t;
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const struct morse_codepoint MORSE[] = {
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/* 0 */ { .length = 5, .values = { DASH, DASH, DASH, DASH, DASH } },
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/* 1 */ { .length = 5, .values = { DOT, DASH, DASH, DASH, DASH } },
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/* 2 */ { .length = 5, .values = { DOT, DOT, DASH, DASH, DASH } },
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/* 3 */ { .length = 5, .values = { DOT, DOT, DOT, DASH, DASH } },
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/* 4 */ { .length = 5, .values = { DOT, DOT, DOT, DOT, DASH } },
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/* 5 */ { .length = 5, .values = { DOT, DOT, DOT, DOT, DOT } },
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/* 6 */ { .length = 5, .values = { DASH, DOT, DOT, DOT, DOT } },
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/* 7 */ { .length = 5, .values = { DASH, DASH, DOT, DOT, DOT } },
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/* 8 */ { .length = 5, .values = { DASH, DASH, DASH, DOT, DOT } },
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/* 9 */ { .length = 5, .values = { DASH, DASH, DASH, DASH, DOT } },
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/* a */ { .length = 2, .values = { DOT, DASH } },
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/* b */ { .length = 4, .values = { DASH, DOT, DOT, DOT } },
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/* c */ { .length = 4, .values = { DASH, DOT, DASH, DOT } },
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/* d */ { .length = 3, .values = { DASH, DOT, DOT } },
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/* e */ { .length = 1, .values = { DOT } },
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/* f */ { .length = 4, .values = { DOT, DOT, DASH, DOT } },
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/* g */ { .length = 3, .values = { DASH, DASH, DOT } },
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/* h */ { .length = 4, .values = { DOT, DOT, DOT, DOT } },
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/* i */ { .length = 2, .values = { DOT, DOT } },
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/* j */ { .length = 4, .values = { DOT, DASH, DASH, DASH } },
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/* k */ { .length = 3, .values = { DASH, DOT, DASH } },
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/* l */ { .length = 4, .values = { DOT, DASH, DOT, DOT } },
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/* m */ { .length = 2, .values = { DASH, DASH } },
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/* n */ { .length = 2, .values = { DASH, DOT } },
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/* o */ { .length = 3, .values = { DASH, DASH, DASH } },
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/* p */ { .length = 4, .values = { DOT, DASH, DASH, DOT } },
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/* q */ { .length = 4, .values = { DASH, DASH, DOT, DASH } },
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/* r */ { .length = 3, .values = { DOT, DASH, DOT } },
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/* s */ { .length = 3, .values = { DOT, DOT, DOT } },
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/* t */ { .length = 1, .values = { DASH } },
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/* u */ { .length = 3, .values = { DOT, DOT, DASH } },
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/* v */ { .length = 4, .values = { DOT, DOT, DOT, DASH } },
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/* w */ { .length = 3, .values = { DOT, DASH, DASH } },
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/* x */ { .length = 4, .values = { DASH, DOT, DOT, DASH } },
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/* y */ { .length = 4, .values = { DASH, DOT, DASH, DASH } },
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/* z */ { .length = 4, .values = { DASH, DASH, DOT, DOT } },
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};
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const struct morse_codepoint * morse_lookup(char val) {
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size_t idx = -1;
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if (val >= '0' && val <= '9') {
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idx = val - '0';
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} else if (val >= 'a' && val <= 'z') {
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idx = (val - 'a') + 10;
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} else if (val >= 'A' && val <= 'Z') {
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idx = (val - 'A') + 10;
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}
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if (idx < 0) return NULL;
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return &MORSE[idx];
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}
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void send_codepoint(io_pin_t *gpio, const struct morse_codepoint *codepoint) {
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const uint8_t one = 1 << gpio->addr;
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for (size_t i = 0; i < codepoint->length; i++) {
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*gpio->port = *(gpio->port) | one;
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if (codepoint->values[i] == DOT) {
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_delay_ms(DOT * SCALE);
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} else {
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_delay_ms(DASH * SCALE);
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}
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*gpio->port = *(gpio->port) & ~one;
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_delay_ms(DIVIDER * SCALE);
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}
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_delay_ms(INTERCHAR * SCALE);
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}
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void send_morse(io_pin_t *gpio, char *message) {
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for (size_t i = 0; i < strlen(message); i++) {
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if (message[i] == ' ') {
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_delay_ms(INTERWORD * SCALE);
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}
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const struct morse_codepoint *codepoint = morse_lookup(message[i]);
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if (codepoint != NULL) {
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send_codepoint(gpio, codepoint);
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}
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}
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}
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