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tondol/hello_fastled.ino

Last active October 19, 2020 16:43
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hello_fastled.ino
// https://github.com/FastLED/FastLED
#include <FastLED.h>
#define FPS 45
const int DATA_PIN = 32;
const int NUM_LEDS = 256;
CRGB leds[NUM_LEDS];
const int CW = 6;
const int CH = 8;
int CN;
int frame = 0;
const char FONT[][CW * CH] = {
// ヨ
{
0,0,0,0,0,0,
0,1,1,1,1,1,
0,0,0,0,0,1,
0,0,1,1,1,1,
0,0,0,0,0,1,
0,0,0,0,0,1,
0,1,1,1,1,1,
0,0,0,0,0,0,
},
// ッ
{
0,0,0,0,0,0,
0,0,0,0,0,0,
0,0,0,0,0,0,
0,1,0,1,0,1,
0,1,0,1,0,1,
0,0,0,0,0,1,
0,1,1,1,1,0,
0,0,0,0,0,0,
},
// シ
{
0,0,0,0,0,0,
0,1,1,1,0,1,
0,0,0,0,0,1,
0,1,1,0,0,1,
0,0,0,0,0,1,
0,0,0,0,0,1,
0,1,1,1,1,0,
0,0,0,0,0,0,
},
// ャ
{
0,0,0,0,0,0,
0,0,0,0,0,0,
0,0,1,0,0,0,
0,1,1,1,1,1,
0,0,1,0,0,1,
0,0,1,0,1,0,
0,0,1,0,0,0,
0,0,0,0,0,0,
},
// ヨ
{
0,0,0,0,0,0,
0,1,1,1,1,1,
0,0,0,0,0,1,
0,0,1,1,1,1,
0,0,0,0,0,1,
0,0,0,0,0,1,
0,1,1,1,1,1,
0,0,0,0,0,0,
},
// ッ
{
0,0,0,0,0,0,
0,0,0,0,0,0,
0,0,0,0,0,0,
0,1,0,1,0,1,
0,1,0,1,0,1,
0,0,0,0,0,1,
0,1,1,1,1,0,
0,0,0,0,0,0,
},
// シ
{
0,0,0,0,0,0,
0,1,1,1,0,1,
0,0,0,0,0,1,
0,1,1,0,0,1,
0,0,0,0,0,1,
0,0,0,0,0,1,
0,1,1,1,1,0,
0,0,0,0,0,0,
},
// ャ
{
0,0,0,0,0,0,
0,0,0,0,0,0,
0,0,1,0,0,0,
0,1,1,1,1,1,
0,0,1,0,0,1,
0,0,1,0,1,0,
0,0,1,0,0,0,
0,0,0,0,0,0,
},
// ワ
{
0,0,0,0,0,0,
0,1,1,1,1,1,
0,1,0,0,0,1,
0,1,0,0,0,1,
0,0,0,0,0,1,
0,0,0,0,1,0,
0,0,1,1,0,0,
0,0,0,0,0,0,
},
// ッ
{
0,0,0,0,0,0,
0,0,0,0,0,0,
0,0,0,0,0,0,
0,1,0,1,0,1,
0,1,0,1,0,1,
0,0,0,0,0,1,
0,1,1,1,1,0,
0,0,0,0,0,0,
},
// シ
{
0,0,0,0,0,0,
0,1,1,1,0,1,
0,0,0,0,0,1,
0,1,1,0,0,1,
0,0,0,0,0,1,
0,0,0,0,0,1,
0,1,1,1,1,0,
0,0,0,0,0,0,
},
// ョ
{
0,0,0,0,0,0,
0,0,0,0,0,0,
0,1,1,1,1,1,
0,0,0,0,0,1,
0,0,1,1,1,1,
0,0,0,0,0,1,
0,1,1,1,1,1,
0,0,0,0,0,0,
},
// イ
{
0,0,0,0,0,0,
0,0,0,0,0,1,
0,0,0,0,1,0,
0,1,1,1,0,0,
0,0,0,1,0,0,
0,0,0,1,0,0,
0,0,0,1,0,0,
0,0,0,0,0,0,
},
// !!
{
0,0,0,0,0,0,
0,1,0,1,0,0,
0,1,0,1,0,0,
0,1,0,1,0,0,
0,0,0,0,0,0,
0,1,0,1,0,0,
0,1,0,1,0,0,
0,0,0,0,0,0,
},
};
void setup() {
Serial.begin(115200);
delay(100);
// FastLEDの設定
FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS);
FastLED.setBrightness(64);
set_max_power_in_volts_and_milliamps(5, 100);
CN = sizeof(FONT) / (sizeof(char) * CW * CH);
}
/* RAW LED INDEX 実際に出力時に使われるLEDインデックス
* _0 15 ...
* _1 14 ...
* _2 13 ...
* _3 12 ...
* _4 11 ...
* _5 10 ...
* _6 _9 ...
* _7 _8 ...
*/
/* LED INDEX オフセット計算をしやすくするための仮想LEDインデックス
* _0 _8 ...
* _1 _9 ...
* _2 10 ...
* _3 11 ...
* _4 12 ...
* _5 13 ...
* _6 14 ...
* _7 15 ...
*/
/* CHAR INDEX (i,x,y) フォントデータの取得に使われる座標
* (0,0,0) (0,1,0) ... (0,5,0) (1,0,0) ...
* (0,0,1) (0,1,1) ...
* (0,0,2) (0,1,2) ...
* (0,0,3) (0,1,3) ...
* (0,0,4) (0,1,4) ...
* (0,0,5) (0,1,5) ...
* (0,0,6) (0,1,6) ...
* (0,0,7) (0,1,7) ...
*/
// 仮想LEDインデックス -> 文字座標
void getCharPositionFromLEDIndex(int *ci, int *cx, int *cy, int i) {
*ci = i / (CW * CH) % CN;
*cx = i / CH % CW;
*cy = i % CH;
}
// 仮想LEDインデックス -> 生LEDインデックス
int getRawLEDIndex(int i) {
int ci = i / (CW * CH) % CN;
int cx = i / CH % CW;
int cy = (i / CH % 2) ? (CH - i % CH - 1) : (i % CH);
return ci * CW * CH + cx * CH + cy;
}
void loop() {
for (int i = 0; i < NUM_LEDS; i++) {
int ci, cx, cy;
// 文字スクロールのため、オフセットされた仮想LEDインデックスを計算する
int offset_i = i + frame * CH;
getCharPositionFromLEDIndex(&ci, &cx, &cy, offset_i);
// 出力時は生インデックスに変換する
int raw_i = getRawLEDIndex(i);
int h = (i / CH + frame * 4) % 256;
int b = FONT[ci][cy * CW + cx] ? 128 : 0;
leds[raw_i] = CHSV(h, 255, b);
}
FastLED.show();
FastLED.delay(1000 / FPS);
frame++;
}
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