Future Electronics / Mbed OS sequana-rgb-led-example

Example program to blink RGB LEDs on Sequana board in a rotating pattern.

main.cpp@0:da2de84c3c04, 2019-02-05 (annotated)

Committer:
lru
Date:
Tue Feb 05 13:58:47 2019 +0000
Revision:
0:da2de84c3c04
Child:
2:a83100cd9c9a
Initial revision for online IDE.

Who changed what in which revision?

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lru 0:da2de84c3c04 1 /*
lru 0:da2de84c3c04 2 * Mbed OS example program for Future Electronics Sequana board.
lru 0:da2de84c3c04 3 *
lru 0:da2de84c3c04 4 * Copyright (c) 2018 Future Electronics
lru 0:da2de84c3c04 5 *
lru 0:da2de84c3c04 6 * Licensed under the Apache License, Version 2.0 (the "License");
lru 0:da2de84c3c04 7 * you may not use this file except in compliance with the License.
lru 0:da2de84c3c04 8 * You may obtain a copy of the License at
lru 0:da2de84c3c04 9 *
lru 0:da2de84c3c04 10 * http://www.apache.org/licenses/LICENSE-2.0
lru 0:da2de84c3c04 11 *
lru 0:da2de84c3c04 12 * Unless required by applicable law or agreed to in writing, software
lru 0:da2de84c3c04 13 * distributed under the License is distributed on an "AS IS" BASIS,
lru 0:da2de84c3c04 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
lru 0:da2de84c3c04 15 * See the License for the specific language governing permissions and
lru 0:da2de84c3c04 16 * limitations under the License.
lru 0:da2de84c3c04 17 */
lru 0:da2de84c3c04 18
lru 0:da2de84c3c04 19 // This example demonstrates used of ROHM BD2808 24-channel LED Controller
lru 0:da2de84c3c04 20 // and its driver library on Sequana board.
lru 0:da2de84c3c04 21
lru 0:da2de84c3c04 22 #include "mbed.h"
lru 0:da2de84c3c04 23 #include "BD2808.h"
lru 0:da2de84c3c04 24
lru 0:da2de84c3c04 25 BD2808 leds;
lru 0:da2de84c3c04 26
lru 0:da2de84c3c04 27 BGR24_color_t dim(BGR24_color_t color, uint8_t percent)
lru 0:da2de84c3c04 28 {
lru 0:da2de84c3c04 29 BGR24_color_t new_color;
lru 0:da2de84c3c04 30
lru 0:da2de84c3c04 31 new_color.r = color.r * percent / 100;
lru 0:da2de84c3c04 32 new_color.g = color.g * percent / 100;
lru 0:da2de84c3c04 33 new_color.b = color.b * percent / 100;
lru 0:da2de84c3c04 34
lru 0:da2de84c3c04 35 return new_color;
lru 0:da2de84c3c04 36 }
lru 0:da2de84c3c04 37
lru 0:da2de84c3c04 38 #define sat(x) (uint8_t)((x) > 255? 255 : (x) < 0? 0 : (x))
lru 0:da2de84c3c04 39
lru 0:da2de84c3c04 40 BGR24_color_t gen_color()
lru 0:da2de84c3c04 41 {
lru 0:da2de84c3c04 42 const uint8_t step = 20;
lru 0:da2de84c3c04 43 const uint8_t max = 200;
lru 0:da2de84c3c04 44 static uint32_t i = 0;
lru 0:da2de84c3c04 45 static uint32_t j = 0;
lru 0:da2de84c3c04 46 static int32_t r = max;
lru 0:da2de84c3c04 47 static int32_t g = max;
lru 0:da2de84c3c04 48 static int32_t b = 0;
lru 0:da2de84c3c04 49 static uint8_t pull = 0;
lru 0:da2de84c3c04 50
lru 0:da2de84c3c04 51 if (++j == 6)
lru 0:da2de84c3c04 52 {
lru 0:da2de84c3c04 53 j = 0;
lru 0:da2de84c3c04 54 if ( i < 10)
lru 0:da2de84c3c04 55 {
lru 0:da2de84c3c04 56 b += step;
lru 0:da2de84c3c04 57 r -= step;
lru 0:da2de84c3c04 58 }
lru 0:da2de84c3c04 59 else if (i < 20)
lru 0:da2de84c3c04 60 {
lru 0:da2de84c3c04 61 r += step;
lru 0:da2de84c3c04 62 g -= step;
lru 0:da2de84c3c04 63 }
lru 0:da2de84c3c04 64 else if (i < 30)
lru 0:da2de84c3c04 65 {
lru 0:da2de84c3c04 66 g += step;
lru 0:da2de84c3c04 67 b -= step;
lru 0:da2de84c3c04 68 }
lru 0:da2de84c3c04 69
lru 0:da2de84c3c04 70 if (++i >= 30) {
lru 0:da2de84c3c04 71 i = 0;
lru 0:da2de84c3c04 72 }
lru 0:da2de84c3c04 73
lru 0:da2de84c3c04 74 if (i == 0) {
lru 0:da2de84c3c04 75 if ((pull += 20) > 180) {
lru 0:da2de84c3c04 76 pull = 0;
lru 0:da2de84c3c04 77 }
lru 0:da2de84c3c04 78 g = max - pull;
lru 0:da2de84c3c04 79 r = max ;//+ pull/2;
lru 0:da2de84c3c04 80 b = pull / 2;
lru 0:da2de84c3c04 81 } else if (i == 10) {
lru 0:da2de84c3c04 82 b = max - pull;
lru 0:da2de84c3c04 83 r = pull/2;
lru 0:da2de84c3c04 84 g = max ;//+ pull/2;
lru 0:da2de84c3c04 85 } else if (i == 20) {
lru 0:da2de84c3c04 86 r = max - pull;
lru 0:da2de84c3c04 87 g = pull / 2;
lru 0:da2de84c3c04 88 b = max ;//+ pull/2;
lru 0:da2de84c3c04 89 }
lru 0:da2de84c3c04 90 }
lru 0:da2de84c3c04 91
lru 0:da2de84c3c04 92 return BGR24_color_t(sat(b), sat(g), sat(r));
lru 0:da2de84c3c04 93 }
lru 0:da2de84c3c04 94
lru 0:da2de84c3c04 95
lru 0:da2de84c3c04 96 #define NUM_LEDS_LIGHTING 3
lru 0:da2de84c3c04 97
lru 0:da2de84c3c04 98 uint32_t led_index[NUM_LEDS_LIGHTING] = {0, 1, 2};
lru 0:da2de84c3c04 99 BGR24_color_t current_col[NUM_LEDS_LIGHTING];
lru 0:da2de84c3c04 100
lru 0:da2de84c3c04 101 // main() runs in its own thread in the OS
lru 0:da2de84c3c04 102 int main() {
lru 0:da2de84c3c04 103
lru 0:da2de84c3c04 104 leds.set_dma_usage(DMA_USAGE_ALWAYS);
lru 0:da2de84c3c04 105
lru 0:da2de84c3c04 106 while (true) {
lru 0:da2de84c3c04 107 for (int i = 0; i < NUM_LEDS_LIGHTING; ++i) {
lru 0:da2de84c3c04 108 leds.set_color(led_index[i], current_col[i]);
lru 0:da2de84c3c04 109 }
lru 0:da2de84c3c04 110 leds.refresh();
lru 0:da2de84c3c04 111
lru 0:da2de84c3c04 112 wait_ms(50);
lru 0:da2de84c3c04 113 leds.set_color(led_index[0], BGR24_color_t(0,0,0));
lru 0:da2de84c3c04 114
lru 0:da2de84c3c04 115 for (int i = 0; i < NUM_LEDS_LIGHTING; ++i) {
lru 0:da2de84c3c04 116 if (++led_index[i] == 8) led_index[i] = 0;
lru 0:da2de84c3c04 117 }
lru 0:da2de84c3c04 118 current_col[2] = gen_color();
lru 0:da2de84c3c04 119 current_col[1] = dim(current_col[2], 50);
lru 0:da2de84c3c04 120 current_col[0] = dim(current_col[2], 15);
lru 0:da2de84c3c04 121 }
lru 0:da2de84c3c04 122 }
lru 0:da2de84c3c04 123