Rob Dobson / LEDMatrix

Forked LEDMatrix and added horizontal scrolling

Fork of LEDMatrix by Yihui Xiong

LEDMatrix.cpp@1:79cf2e115449, 2016-01-11 (annotated)

Committer:
Bobty
Date:
Mon Jan 11 21:05:53 2016 +0000
Revision:
1:79cf2e115449
Parent:
0:13728deac7a7
Child:
2:cd2da920cf98
Implemented horizontal scrolling

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 0:13728deac7a7 1 /**
yihui 0:13728deac7a7 2 * LED Matrix library for http://www.seeedstudio.com/depot/ultrathin-16x32-red-led-matrix-panel-p-1582.html
yihui 0:13728deac7a7 3 * The LED Matrix panel has 32x16 pixels. Several panel can be combined together as a large screen.
yihui 0:13728deac7a7 4 *
yihui 0:13728deac7a7 5 * Coordinate & Connection (mbed -> panel 0 -> panel 1 -> ...)
yihui 0:13728deac7a7 6 * (0, 0) (0, 0)
yihui 0:13728deac7a7 7 * +--------+--------+--------+ +--------+--------+
yihui 0:13728deac7a7 8 * | 5 | 3 | 1 | | 1 | 0 |
yihui 0:13728deac7a7 9 * | | | | | | |<----- mbed
yihui 0:13728deac7a7 10 * +--------+--------+--------+ +--------+--------+
yihui 0:13728deac7a7 11 * | 4 | 2 | 0 | (64, 16)
yihui 0:13728deac7a7 12 * | | | |<----- mbed
yihui 0:13728deac7a7 13 * +--------+--------+--------+
yihui 0:13728deac7a7 14 * (96, 32)
yihui 0:13728deac7a7 15 * Copyright (c) 2013 Seeed Technology Inc.
yihui 0:13728deac7a7 16 * @auther Yihui Xiong
yihui 0:13728deac7a7 17 * @date Nov 8, 2013
yihui 0:13728deac7a7 18 * @license Apache
yihui 0:13728deac7a7 19 */
yihui 0:13728deac7a7 20
yihui 0:13728deac7a7 21 #include "LEDMatrix.h"
yihui 0:13728deac7a7 22 #include "mbed.h"
yihui 0:13728deac7a7 23
yihui 0:13728deac7a7 24 #if 0
yihui 0:13728deac7a7 25 #define ASSERT(e) if (!(e)) { Serial.println(#e); while (1); }
yihui 0:13728deac7a7 26 #else
yihui 0:13728deac7a7 27 #define ASSERT(e)
yihui 0:13728deac7a7 28 #endif
yihui 0:13728deac7a7 29
yihui 0:13728deac7a7 30 LEDMatrix::LEDMatrix(PinName pinA, PinName pinB, PinName pinC, PinName pinD, PinName pinOE, PinName pinR1, PinName pinSTB, PinName pinCLK) :
yihui 0:13728deac7a7 31 a(pinA), b(pinB), c(pinC), d(pinD), oe(pinOE), r1(pinR1), stb(pinSTB), clk(pinCLK)
yihui 0:13728deac7a7 32 {
yihui 0:13728deac7a7 33 this->clk = clk;
yihui 0:13728deac7a7 34 this->r1 = r1;
yihui 0:13728deac7a7 35 this->stb = stb;
yihui 0:13728deac7a7 36 this->oe = oe;
yihui 0:13728deac7a7 37 this->a = a;
yihui 0:13728deac7a7 38 this->b = b;
yihui 0:13728deac7a7 39 this->c = c;
yihui 0:13728deac7a7 40 this->d = d;
yihui 0:13728deac7a7 41
yihui 0:13728deac7a7 42 mask = 0xff;
yihui 0:13728deac7a7 43 state = 0;
Bobty 1:79cf2e115449 44 _horizontalScrollPos = 0;
yihui 0:13728deac7a7 45 }
yihui 0:13728deac7a7 46
yihui 0:13728deac7a7 47 void LEDMatrix::begin(uint8_t *displaybuf, uint16_t width, uint16_t height)
yihui 0:13728deac7a7 48 {
yihui 0:13728deac7a7 49 ASSERT(0 == (width % 32));
yihui 0:13728deac7a7 50 ASSERT(0 == (height % 16));
yihui 0:13728deac7a7 51
yihui 0:13728deac7a7 52 this->displaybuf = displaybuf;
yihui 0:13728deac7a7 53 this->width = width;
yihui 0:13728deac7a7 54 this->height = height;
yihui 0:13728deac7a7 55
yihui 0:13728deac7a7 56 state = 1;
yihui 0:13728deac7a7 57 }
yihui 0:13728deac7a7 58
yihui 0:13728deac7a7 59 void LEDMatrix::drawPoint(uint16_t x, uint16_t y, uint8_t pixel)
yihui 0:13728deac7a7 60 {
yihui 0:13728deac7a7 61 ASSERT(width > x);
yihui 0:13728deac7a7 62 ASSERT(height > y);
yihui 0:13728deac7a7 63
Bobty 1:79cf2e115449 64 uint8_t *byte = displaybuf + (height - 1 - y) * width / 8 + (width - 1 - x) / 8;
Bobty 1:79cf2e115449 65 uint8_t bit = (width - 1 - x) % 8;
yihui 0:13728deac7a7 66
yihui 0:13728deac7a7 67 if (pixel) {
yihui 0:13728deac7a7 68 *byte |= 0x80 >> bit;
yihui 0:13728deac7a7 69 } else {
yihui 0:13728deac7a7 70 *byte &= ~(0x80 >> bit);
yihui 0:13728deac7a7 71 }
yihui 0:13728deac7a7 72 }
yihui 0:13728deac7a7 73
yihui 0:13728deac7a7 74 void LEDMatrix::drawRect(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint8_t pixel)
yihui 0:13728deac7a7 75 {
yihui 0:13728deac7a7 76 for (uint16_t x = x1; x < x2; x++) {
yihui 0:13728deac7a7 77 for (uint16_t y = y1; y < y2; y++) {
yihui 0:13728deac7a7 78 drawPoint(x, y, pixel);
yihui 0:13728deac7a7 79 }
yihui 0:13728deac7a7 80 }
yihui 0:13728deac7a7 81 }
yihui 0:13728deac7a7 82
yihui 0:13728deac7a7 83 void LEDMatrix::drawImage(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint8_t *image)
yihui 0:13728deac7a7 84 {
yihui 0:13728deac7a7 85 ASSERT(0 == ((x2 - x1) % 8));
yihui 0:13728deac7a7 86
yihui 0:13728deac7a7 87 for (uint16_t x = x1; x < x2; x++) {
yihui 0:13728deac7a7 88 for (uint16_t y = y1; y < y2; y++) {
yihui 0:13728deac7a7 89 uint8_t *byte = image + x * 8 + y / 8;
yihui 0:13728deac7a7 90 uint8_t bit = 7 - (y % 8);
yihui 0:13728deac7a7 91 uint8_t pixel = (*byte >> bit) & 1;
yihui 0:13728deac7a7 92
yihui 0:13728deac7a7 93 drawPoint(x, y, pixel);
yihui 0:13728deac7a7 94 }
yihui 0:13728deac7a7 95 }
yihui 0:13728deac7a7 96 }
yihui 0:13728deac7a7 97
yihui 0:13728deac7a7 98 void LEDMatrix::clear()
yihui 0:13728deac7a7 99 {
yihui 0:13728deac7a7 100 uint8_t *ptr = displaybuf;
yihui 0:13728deac7a7 101 for (uint16_t i = 0; i < (width * height / 8); i++) {
yihui 0:13728deac7a7 102 *ptr = 0x00;
yihui 0:13728deac7a7 103 ptr++;
yihui 0:13728deac7a7 104 }
yihui 0:13728deac7a7 105 }
yihui 0:13728deac7a7 106
yihui 0:13728deac7a7 107 void LEDMatrix::reverse()
yihui 0:13728deac7a7 108 {
yihui 0:13728deac7a7 109 mask = ~mask;
yihui 0:13728deac7a7 110 }
yihui 0:13728deac7a7 111
yihui 0:13728deac7a7 112 uint8_t LEDMatrix::isReversed()
yihui 0:13728deac7a7 113 {
yihui 0:13728deac7a7 114 return mask;
yihui 0:13728deac7a7 115 }
yihui 0:13728deac7a7 116
yihui 0:13728deac7a7 117 void LEDMatrix::scan()
yihui 0:13728deac7a7 118 {
yihui 0:13728deac7a7 119 static uint8_t row = 0;
yihui 0:13728deac7a7 120
Bobty 1:79cf2e115449 121 if (!state)
Bobty 1:79cf2e115449 122 {
yihui 0:13728deac7a7 123 return;
yihui 0:13728deac7a7 124 }
yihui 0:13728deac7a7 125
yihui 0:13728deac7a7 126 uint8_t *head = displaybuf + row * (width / 8);
Bobty 1:79cf2e115449 127 for (uint8_t line = 0; line < (height / 16); line++)
Bobty 1:79cf2e115449 128 {
yihui 0:13728deac7a7 129 uint8_t *ptr = head;
yihui 0:13728deac7a7 130 head += line * width * 2;
yihui 0:13728deac7a7 131
Bobty 1:79cf2e115449 132 for (uint8_t byteIdx = 0; byteIdx < (width / 8); byteIdx++)
Bobty 1:79cf2e115449 133 {
Bobty 1:79cf2e115449 134 uint8_t* pByte1 = ptr + (((byteIdx*8 + width - _horizontalScrollPos + 7) % width) / 8);
Bobty 1:79cf2e115449 135 uint8_t* pByte2 = ptr + (((byteIdx*8 + width - _horizontalScrollPos - 1) % width) / 8);
Bobty 1:79cf2e115449 136 int bitOffset = _horizontalScrollPos % 8;
Bobty 1:79cf2e115449 137 uint8_t pixels = ((*pByte1) >> bitOffset) + (((*pByte2) << (8 - bitOffset)) % 256);
Bobty 1:79cf2e115449 138
Bobty 1:79cf2e115449 139 // uint8_t pixels = *ptr;
Bobty 1:79cf2e115449 140 // ptr++;
yihui 0:13728deac7a7 141 pixels = pixels ^ mask; // reverse: mask = 0xff, normal: mask =0x00
Bobty 1:79cf2e115449 142 for (uint8_t bit = 0; bit < 8; bit++)
Bobty 1:79cf2e115449 143 {
yihui 0:13728deac7a7 144 clk = 0;
yihui 0:13728deac7a7 145 r1 = pixels & (0x80 >> bit);
Bobty 1:79cf2e115449 146 // wait_us(1);
yihui 0:13728deac7a7 147 clk = 1;
yihui 0:13728deac7a7 148 }
yihui 0:13728deac7a7 149 }
yihui 0:13728deac7a7 150 }
yihui 0:13728deac7a7 151
yihui 0:13728deac7a7 152 oe = 1; // disable display
yihui 0:13728deac7a7 153
yihui 0:13728deac7a7 154 // select row
yihui 0:13728deac7a7 155 a = (row & 0x01);
yihui 0:13728deac7a7 156 b = (row & 0x02);
yihui 0:13728deac7a7 157 c = (row & 0x04);
yihui 0:13728deac7a7 158 d = (row & 0x08);
yihui 0:13728deac7a7 159
yihui 0:13728deac7a7 160 // latch data
yihui 0:13728deac7a7 161 stb = 0;
Bobty 1:79cf2e115449 162 // wait_us(1);
yihui 0:13728deac7a7 163 stb = 1;
yihui 0:13728deac7a7 164
yihui 0:13728deac7a7 165 oe = 0; // enable display
yihui 0:13728deac7a7 166
yihui 0:13728deac7a7 167 row = (row + 1) & 0x0F;
yihui 0:13728deac7a7 168 }
yihui 0:13728deac7a7 169
yihui 0:13728deac7a7 170 void LEDMatrix::on()
yihui 0:13728deac7a7 171 {
yihui 0:13728deac7a7 172 state = 1;
yihui 0:13728deac7a7 173 }
yihui 0:13728deac7a7 174
yihui 0:13728deac7a7 175 void LEDMatrix::off()
yihui 0:13728deac7a7 176 {
yihui 0:13728deac7a7 177 state = 0;
yihui 0:13728deac7a7 178 oe = 1;
yihui 0:13728deac7a7 179 }
yihui 0:13728deac7a7 180
Bobty 1:79cf2e115449 181 void LEDMatrix::scrollReset()
Bobty 1:79cf2e115449 182 {
Bobty 1:79cf2e115449 183 _horizontalScrollPos = 0;
Bobty 1:79cf2e115449 184 }
Bobty 1:79cf2e115449 185
Bobty 1:79cf2e115449 186 void LEDMatrix::scrollLeft()
Bobty 1:79cf2e115449 187 {
Bobty 1:79cf2e115449 188 _horizontalScrollPos++;
Bobty 1:79cf2e115449 189 if (_horizontalScrollPos >= width)
Bobty 1:79cf2e115449 190 _horizontalScrollPos = 0;
Bobty 1:79cf2e115449 191 }
Bobty 1:79cf2e115449 192
Bobty 1:79cf2e115449 193 void LEDMatrix::scrollToPos(int pos)
Bobty 1:79cf2e115449 194 {
Bobty 1:79cf2e115449 195 if ((pos <= 0) || (pos >= width))
Bobty 1:79cf2e115449 196 return;
Bobty 1:79cf2e115449 197 _horizontalScrollPos = pos;
Bobty 1:79cf2e115449 198 }