Final Project / Mbed 2 deprecated mbed-os-Final

This is a very simple guide, reviewing the steps required to get Blinky working on an Mbed OS platform.

Dependencies:   mbed Adafruit_GFX

WS2812.cpp@96:7465ab270e7a, 2019-06-13 (annotated)

Committer:
ParkChunMyong
Date:
Thu Jun 13 03:26:42 2019 +0000
Revision:
96:7465ab270e7a
Parent:
95:250afd53b710 
first init

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ParkChunMyong 95:250afd53b710 1 #include "WS2812.h"
ParkChunMyong 95:250afd53b710 2
ParkChunMyong 95:250afd53b710 3 WS2812::WS2812(PinName pin, int size, int zeroHigh, int zeroLow, int oneHigh, int oneLow) : __gpo(pin)
ParkChunMyong 95:250afd53b710 4 {
ParkChunMyong 95:250afd53b710 5 __size = size;
ParkChunMyong 95:250afd53b710 6 __transmitBuf = new bool[size * FRAME_SIZE];
ParkChunMyong 95:250afd53b710 7 __use_II = OFF;
ParkChunMyong 95:250afd53b710 8 __II = 0xFF; // set global intensity to full
ParkChunMyong 95:250afd53b710 9 __outPin = pin;
ParkChunMyong 95:250afd53b710 10
ParkChunMyong 95:250afd53b710 11 // Default values designed for K64f. Assumes GPIO toggle takes ~0.4us
ParkChunMyong 95:250afd53b710 12 setDelays(zeroHigh, zeroLow, oneHigh, oneLow);
ParkChunMyong 95:250afd53b710 13 }
ParkChunMyong 95:250afd53b710 14
ParkChunMyong 95:250afd53b710 15
ParkChunMyong 95:250afd53b710 16 WS2812::~WS2812()
ParkChunMyong 95:250afd53b710 17 {
ParkChunMyong 95:250afd53b710 18 delete[] __transmitBuf;
ParkChunMyong 95:250afd53b710 19 }
ParkChunMyong 95:250afd53b710 20
ParkChunMyong 95:250afd53b710 21 void WS2812::setDelays(int zeroHigh, int zeroLow, int oneHigh, int oneLow) {
ParkChunMyong 95:250afd53b710 22 __zeroHigh = zeroHigh;
ParkChunMyong 95:250afd53b710 23 __zeroLow = zeroLow;
ParkChunMyong 95:250afd53b710 24 __oneHigh = oneHigh;
ParkChunMyong 95:250afd53b710 25 __oneLow = oneLow;
ParkChunMyong 95:250afd53b710 26 }
ParkChunMyong 95:250afd53b710 27
ParkChunMyong 95:250afd53b710 28 void WS2812::__loadBuf(int buf[],int r_offset, int g_offset, int b_offset) {
ParkChunMyong 95:250afd53b710 29 for (int i = 0; i < __size; i++) {
ParkChunMyong 95:250afd53b710 30 int color = 0;
ParkChunMyong 95:250afd53b710 31
ParkChunMyong 95:250afd53b710 32 color |= ((buf[(i+g_offset)%__size] & 0x0000FF00));
ParkChunMyong 95:250afd53b710 33 color |= ((buf[(i+r_offset)%__size] & 0x00FF0000));
ParkChunMyong 95:250afd53b710 34 color |= (buf[(i+b_offset)%__size] & 0x000000FF);
ParkChunMyong 95:250afd53b710 35 color |= (buf[i] & 0xFF000000);
ParkChunMyong 95:250afd53b710 36
ParkChunMyong 95:250afd53b710 37 // Outut format : GGRRBB
ParkChunMyong 95:250afd53b710 38 // Inout format : IIRRGGBB
ParkChunMyong 95:250afd53b710 39 unsigned char agrb[4] = {0x0, 0x0, 0x0, 0x0};
ParkChunMyong 95:250afd53b710 40
ParkChunMyong 95:250afd53b710 41 unsigned char sf; // scaling factor for II
ParkChunMyong 95:250afd53b710 42
ParkChunMyong 95:250afd53b710 43 // extract colour fields from incoming
ParkChunMyong 95:250afd53b710 44 // 0 = green, 1 = red, 2 = blue, 3 = brightness
ParkChunMyong 95:250afd53b710 45 agrb[0] = (color & 0x0000FF00) >> 8;
ParkChunMyong 95:250afd53b710 46 agrb[1] = (color & 0x00FF0000) >> 16;
ParkChunMyong 95:250afd53b710 47 agrb[2] = color & 0x000000FF;
ParkChunMyong 95:250afd53b710 48 agrb[3] = (color & 0xFF000000) >> 24;
ParkChunMyong 95:250afd53b710 49
ParkChunMyong 95:250afd53b710 50 // set the intensity scaling factor (global, per pixel, none)
ParkChunMyong 95:250afd53b710 51 if (__use_II == GLOBAL) {
ParkChunMyong 95:250afd53b710 52 sf = __II;
ParkChunMyong 95:250afd53b710 53 } else if (__use_II == PER_PIXEL) {
ParkChunMyong 95:250afd53b710 54 sf = agrb[3];
ParkChunMyong 95:250afd53b710 55 } else {
ParkChunMyong 95:250afd53b710 56 sf = 0xFF;
ParkChunMyong 95:250afd53b710 57 }
ParkChunMyong 95:250afd53b710 58
ParkChunMyong 95:250afd53b710 59 // Apply the scaling factor to each othe colour components
ParkChunMyong 95:250afd53b710 60 for (int clr = 0; clr < 3; clr++) {
ParkChunMyong 95:250afd53b710 61 agrb[clr] = ((agrb[clr] * sf) >> 8);
ParkChunMyong 95:250afd53b710 62
ParkChunMyong 95:250afd53b710 63 for (int j = 0; j < 8; j++) {
ParkChunMyong 95:250afd53b710 64 if (((agrb[clr] << j) & 0x80) == 0x80) {
ParkChunMyong 95:250afd53b710 65 // Bit is set (checks MSB fist)
ParkChunMyong 95:250afd53b710 66 __transmitBuf[(i * FRAME_SIZE) + (clr * 8) + j] = 1;
ParkChunMyong 95:250afd53b710 67 } else {
ParkChunMyong 95:250afd53b710 68 // Bit is clear
ParkChunMyong 95:250afd53b710 69 __transmitBuf[(i * FRAME_SIZE) + (clr * 8) + j] = 0;
ParkChunMyong 95:250afd53b710 70 }
ParkChunMyong 95:250afd53b710 71 }
ParkChunMyong 95:250afd53b710 72 }
ParkChunMyong 95:250afd53b710 73 }
ParkChunMyong 95:250afd53b710 74 }
ParkChunMyong 95:250afd53b710 75
ParkChunMyong 95:250afd53b710 76 void WS2812::write(int buf[]) {
ParkChunMyong 95:250afd53b710 77 write_offsets(buf, 0, 0, 0);
ParkChunMyong 95:250afd53b710 78 }
ParkChunMyong 95:250afd53b710 79
ParkChunMyong 95:250afd53b710 80 void WS2812::write_offsets (int buf[],int r_offset, int g_offset, int b_offset) {
ParkChunMyong 95:250afd53b710 81 int i, j;
ParkChunMyong 95:250afd53b710 82
ParkChunMyong 95:250afd53b710 83 // Load the transmit buffer
ParkChunMyong 95:250afd53b710 84 __loadBuf(buf, r_offset, g_offset, b_offset);
ParkChunMyong 95:250afd53b710 85
ParkChunMyong 95:250afd53b710 86 // Entering timing critical section, so disabling interrupts
ParkChunMyong 95:250afd53b710 87 __disable_irq();
ParkChunMyong 95:250afd53b710 88
ParkChunMyong 95:250afd53b710 89 // Begin bit-banging
ParkChunMyong 95:250afd53b710 90 for (i = 0; i < FRAME_SIZE * __size; i++) {
ParkChunMyong 95:250afd53b710 91 j = 0;
ParkChunMyong 95:250afd53b710 92 if (__transmitBuf[i]){
ParkChunMyong 95:250afd53b710 93 __gpo = 1;
ParkChunMyong 95:250afd53b710 94 for (; j < __oneHigh; j++) {
ParkChunMyong 95:250afd53b710 95 __nop();
ParkChunMyong 95:250afd53b710 96 }
ParkChunMyong 95:250afd53b710 97 __gpo = 0;
ParkChunMyong 95:250afd53b710 98 for (; j < __oneLow; j++) {
ParkChunMyong 95:250afd53b710 99 __nop();
ParkChunMyong 95:250afd53b710 100 }
ParkChunMyong 95:250afd53b710 101 } else {
ParkChunMyong 95:250afd53b710 102 __gpo = 1;
ParkChunMyong 95:250afd53b710 103 for (; j < __zeroHigh; j++) {
ParkChunMyong 95:250afd53b710 104 __nop();
ParkChunMyong 95:250afd53b710 105 }
ParkChunMyong 95:250afd53b710 106 __gpo = 0;
ParkChunMyong 95:250afd53b710 107 for (; j < __zeroLow; j++) {
ParkChunMyong 95:250afd53b710 108 __nop();
ParkChunMyong 95:250afd53b710 109 }
ParkChunMyong 95:250afd53b710 110 }
ParkChunMyong 95:250afd53b710 111 }
ParkChunMyong 95:250afd53b710 112
ParkChunMyong 95:250afd53b710 113 // Exiting timing critical section, so enabling interrutps
ParkChunMyong 95:250afd53b710 114 __enable_irq();
ParkChunMyong 95:250afd53b710 115 }
ParkChunMyong 95:250afd53b710 116
ParkChunMyong 95:250afd53b710 117
ParkChunMyong 95:250afd53b710 118 void WS2812::useII(BrightnessControl bc)
ParkChunMyong 95:250afd53b710 119 {
ParkChunMyong 95:250afd53b710 120 if (bc > OFF) {
ParkChunMyong 95:250afd53b710 121 __use_II = bc;
ParkChunMyong 95:250afd53b710 122 } else {
ParkChunMyong 95:250afd53b710 123 __use_II = OFF;
ParkChunMyong 95:250afd53b710 124 }
ParkChunMyong 95:250afd53b710 125 }
ParkChunMyong 95:250afd53b710 126
ParkChunMyong 95:250afd53b710 127 void WS2812::setII(unsigned char II)
ParkChunMyong 95:250afd53b710 128 {
ParkChunMyong 95:250afd53b710 129 __II = II;
ParkChunMyong 95:250afd53b710 130 }
ParkChunMyong 95:250afd53b710 131
ParkChunMyong 95:250afd53b710 132
ParkChunMyong 95:250afd53b710 133
ParkChunMyong 95:250afd53b710 134
ParkChunMyong 95:250afd53b710 135
ParkChunMyong 95:250afd53b710 136
ParkChunMyong 95:250afd53b710 137