Yihui Xiong / LEDMatrix

LED matrix library for http://goo.gl/y6VnO6

Dependents:   led_matrix

LEDMatrix.cpp@1:b528f8e32726, 2014-02-18 (annotated)

Committer:
Yihui Xiong
Date:
Tue Feb 18 10:51:13 2014 +0800
Revision:
1:b528f8e32726
Parent:
0:13728deac7a7 
bug fix

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;
yihui 0:13728deac7a7 44 }
yihui 0:13728deac7a7 45
yihui 0:13728deac7a7 46 void LEDMatrix::begin(uint8_t *displaybuf, uint16_t width, uint16_t height)
yihui 0:13728deac7a7 47 {
yihui 0:13728deac7a7 48 ASSERT(0 == (width % 32));
yihui 0:13728deac7a7 49 ASSERT(0 == (height % 16));
yihui 0:13728deac7a7 50
yihui 0:13728deac7a7 51 this->displaybuf = displaybuf;
yihui 0:13728deac7a7 52 this->width = width;
yihui 0:13728deac7a7 53 this->height = height;
yihui 0:13728deac7a7 54
yihui 0:13728deac7a7 55 state = 1;
yihui 0:13728deac7a7 56 }
yihui 0:13728deac7a7 57
yihui 0:13728deac7a7 58 void LEDMatrix::drawPoint(uint16_t x, uint16_t y, uint8_t pixel)
yihui 0:13728deac7a7 59 {
yihui 0:13728deac7a7 60 ASSERT(width > x);
yihui 0:13728deac7a7 61 ASSERT(height > y);
yihui 0:13728deac7a7 62
Yihui Xiong 1:b528f8e32726 63 uint8_t *byte = displaybuf + x / 8 + y * width / 8;
Yihui Xiong 1:b528f8e32726 64 uint8_t bit = x % 8;
yihui 0:13728deac7a7 65
yihui 0:13728deac7a7 66 if (pixel) {
yihui 0:13728deac7a7 67 *byte |= 0x80 >> bit;
yihui 0:13728deac7a7 68 } else {
yihui 0:13728deac7a7 69 *byte &= ~(0x80 >> bit);
yihui 0:13728deac7a7 70 }
yihui 0:13728deac7a7 71 }
yihui 0:13728deac7a7 72
yihui 0:13728deac7a7 73 void LEDMatrix::drawRect(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint8_t pixel)
yihui 0:13728deac7a7 74 {
yihui 0:13728deac7a7 75 for (uint16_t x = x1; x < x2; x++) {
yihui 0:13728deac7a7 76 for (uint16_t y = y1; y < y2; y++) {
yihui 0:13728deac7a7 77 drawPoint(x, y, pixel);
yihui 0:13728deac7a7 78 }
yihui 0:13728deac7a7 79 }
yihui 0:13728deac7a7 80 }
yihui 0:13728deac7a7 81
Yihui Xiong 1:b528f8e32726 82 void LEDMatrix::drawImage(uint16_t xoffset, uint16_t yoffset, uint16_t width, uint16_t height, const uint8_t *image)
yihui 0:13728deac7a7 83 {
Yihui Xiong 1:b528f8e32726 84 for (uint16_t y = 0; y < height; y++) {
Yihui Xiong 1:b528f8e32726 85 for (uint16_t x = 0; x < width; x++) {
Yihui Xiong 1:b528f8e32726 86 const uint8_t *byte = image + (x + y * width) / 8;
Yihui Xiong 1:b528f8e32726 87 uint8_t bit = 7 - x % 8;
yihui 0:13728deac7a7 88 uint8_t pixel = (*byte >> bit) & 1;
yihui 0:13728deac7a7 89
Yihui Xiong 1:b528f8e32726 90 drawPoint(x + xoffset, y + yoffset, pixel);
yihui 0:13728deac7a7 91 }
yihui 0:13728deac7a7 92 }
yihui 0:13728deac7a7 93 }
yihui 0:13728deac7a7 94
yihui 0:13728deac7a7 95 void LEDMatrix::clear()
yihui 0:13728deac7a7 96 {
yihui 0:13728deac7a7 97 uint8_t *ptr = displaybuf;
yihui 0:13728deac7a7 98 for (uint16_t i = 0; i < (width * height / 8); i++) {
yihui 0:13728deac7a7 99 *ptr = 0x00;
yihui 0:13728deac7a7 100 ptr++;
yihui 0:13728deac7a7 101 }
yihui 0:13728deac7a7 102 }
yihui 0:13728deac7a7 103
yihui 0:13728deac7a7 104 void LEDMatrix::reverse()
yihui 0:13728deac7a7 105 {
yihui 0:13728deac7a7 106 mask = ~mask;
yihui 0:13728deac7a7 107 }
yihui 0:13728deac7a7 108
yihui 0:13728deac7a7 109 uint8_t LEDMatrix::isReversed()
yihui 0:13728deac7a7 110 {
yihui 0:13728deac7a7 111 return mask;
yihui 0:13728deac7a7 112 }
yihui 0:13728deac7a7 113
yihui 0:13728deac7a7 114 void LEDMatrix::scan()
yihui 0:13728deac7a7 115 {
yihui 0:13728deac7a7 116 static uint8_t row = 0;
yihui 0:13728deac7a7 117
yihui 0:13728deac7a7 118 if (!state) {
yihui 0:13728deac7a7 119 return;
yihui 0:13728deac7a7 120 }
yihui 0:13728deac7a7 121
yihui 0:13728deac7a7 122 uint8_t *head = displaybuf + row * (width / 8);
yihui 0:13728deac7a7 123 for (uint8_t line = 0; line < (height / 16); line++) {
yihui 0:13728deac7a7 124 uint8_t *ptr = head;
Yihui Xiong 1:b528f8e32726 125 head += width * 2; // width * 16 / 8
yihui 0:13728deac7a7 126
yihui 0:13728deac7a7 127 for (uint8_t byte = 0; byte < (width / 8); byte++) {
yihui 0:13728deac7a7 128 uint8_t pixels = *ptr;
yihui 0:13728deac7a7 129 ptr++;
yihui 0:13728deac7a7 130 pixels = pixels ^ mask; // reverse: mask = 0xff, normal: mask =0x00
yihui 0:13728deac7a7 131 for (uint8_t bit = 0; bit < 8; bit++) {
yihui 0:13728deac7a7 132 clk = 0;
yihui 0:13728deac7a7 133 r1 = pixels & (0x80 >> bit);
yihui 0:13728deac7a7 134 clk = 1;
yihui 0:13728deac7a7 135 }
yihui 0:13728deac7a7 136 }
yihui 0:13728deac7a7 137 }
yihui 0:13728deac7a7 138
yihui 0:13728deac7a7 139 oe = 1; // disable display
yihui 0:13728deac7a7 140
yihui 0:13728deac7a7 141 // select row
yihui 0:13728deac7a7 142 a = (row & 0x01);
yihui 0:13728deac7a7 143 b = (row & 0x02);
yihui 0:13728deac7a7 144 c = (row & 0x04);
yihui 0:13728deac7a7 145 d = (row & 0x08);
yihui 0:13728deac7a7 146
yihui 0:13728deac7a7 147 // latch data
yihui 0:13728deac7a7 148 stb = 0;
yihui 0:13728deac7a7 149 stb = 1;
yihui 0:13728deac7a7 150
yihui 0:13728deac7a7 151 oe = 0; // enable display
yihui 0:13728deac7a7 152
yihui 0:13728deac7a7 153 row = (row + 1) & 0x0F;
yihui 0:13728deac7a7 154 }
yihui 0:13728deac7a7 155
yihui 0:13728deac7a7 156 void LEDMatrix::on()
yihui 0:13728deac7a7 157 {
yihui 0:13728deac7a7 158 state = 1;
yihui 0:13728deac7a7 159 }
yihui 0:13728deac7a7 160
yihui 0:13728deac7a7 161 void LEDMatrix::off()
yihui 0:13728deac7a7 162 {
yihui 0:13728deac7a7 163 state = 0;
yihui 0:13728deac7a7 164 oe = 1;
yihui 0:13728deac7a7 165 }
yihui 0:13728deac7a7 166