mirror of
https://github.com/google/mozc-devices.git
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106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Firmware of piropiro (party horn) Bluetooth keyboard.
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*/
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#define V_REF 5.0
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#define PIN_LED 13
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#define N_AD_SAMPLES 10
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#define INTERVAL_MSEC 20
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#define COMMIT_TIME (600 / INTERVAL_MSEC)
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#define ROWS 5
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#define COLS 9
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const char* characters[ROWS * COLS] = {
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"a", "i", "u", "e", "o",
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"ka", "ki", "ku", "ke", "ko",
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"sa", "si", "su", "se", "so",
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"ta", "ti", "tu", "te", "to",
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"na", "ni", "nu", "ne", "no",
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"ha", "hi", "hu", "he", "ho",
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"ma", "mi", "mu", "me", "mo",
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"ya", "ya", "yu", "yu", "yo",
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"wa", "wo", "nn", ",", "."
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};
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int column = 0;
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int vowel = 0;
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int release_duration = 0;
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void setup() {
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Serial.begin(115200);
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pinMode(PIN_LED, OUTPUT);
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column = 0;
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vowel = 0;
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}
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float getVoltage(int ch) {
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return analogRead(ch) * V_REF / 1023;
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}
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float getAverageVoltage(int ch) {
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float sum = 0.0;
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for (int i = 0; i < N_AD_SAMPLES; i++) {
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sum += getVoltage(ch);
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}
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return sum / N_AD_SAMPLES;
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}
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float voltageToLength(float voltage) {
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return 648 - voltage * 268;
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}
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void loop() {
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float length = voltageToLength(getAverageVoltage(0));
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if (length > 350) {
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digitalWrite(PIN_LED, LOW);
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} else {
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digitalWrite(PIN_LED, HIGH);
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if (length < 50) {
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if (vowel > 0) {
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vowel = 0;
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column ++;
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if (column >= COLS) {
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column = 0;
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}
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release_duration = 0;
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} else if (release_duration > COMMIT_TIME) {
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vowel = 0;
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column = 0;
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} else if (column > 0) {
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release_duration ++;
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}
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} else {
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int target_vowel = (length - 80) / 40 + 1;
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if (target_vowel > 5) target_vowel = 5;
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if (vowel < target_vowel) {
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if (column > 0 || vowel > 0) {
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Serial.print("\b");
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}
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vowel ++;
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int current_character = vowel - 1 + column * 5;
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Serial.print(characters[current_character]);
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}
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}
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}
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delay(INTERVAL_MSEC);
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}
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