John Bailey / freetronicsLCDShield

A basic library for the Freetronics arduino LCD shield.

Fork of freetronicsLCDShield by Koen Kempeneers

freetronicsLCDShield.cpp@4:3a0c74cef8e8, 2014-12-13 (annotated)

Committer:
KKempeneers
Date:
Sat Dec 13 09:18:36 2014 +0000
Revision:
4:3a0c74cef8e8
Parent:
1:ddcefddda4a7
Child:
6:ac481535732f
The author's mail address is changed.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
KKempeneers 1:ddcefddda4a7 1 /* mbed freetronicsLCDShield Library, written by Koen J.F. Kempeneers
KKempeneers 4:3a0c74cef8e8 2 * kkempeneers(at)skynet.be
KKempeneers 1:ddcefddda4a7 3 *
KKempeneers 1:ddcefddda4a7 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
KKempeneers 1:ddcefddda4a7 5 * of this software and associated documentation files (the "Software"), to deal
KKempeneers 1:ddcefddda4a7 6 * in the Software without restriction, including without limitation the rights
KKempeneers 1:ddcefddda4a7 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
KKempeneers 1:ddcefddda4a7 8 * copies of the Software, and to permit persons to whom the Software is
KKempeneers 1:ddcefddda4a7 9 * furnished to do so, subject to the following conditions:
KKempeneers 1:ddcefddda4a7 10 *
KKempeneers 1:ddcefddda4a7 11 * The above copyright notice and this permission notice shall be included in
KKempeneers 1:ddcefddda4a7 12 * all copies or substantial portions of the Software.
KKempeneers 1:ddcefddda4a7 13 *
KKempeneers 1:ddcefddda4a7 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
KKempeneers 1:ddcefddda4a7 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
KKempeneers 1:ddcefddda4a7 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
KKempeneers 1:ddcefddda4a7 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
KKempeneers 1:ddcefddda4a7 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
KKempeneers 1:ddcefddda4a7 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
KKempeneers 1:ddcefddda4a7 20 * THE SOFTWARE.
KKempeneers 1:ddcefddda4a7 21 */
KKempeneers 1:ddcefddda4a7 22
KKempeneers 0:01f3d38f8b6d 23 #include "mbed.h"
KKempeneers 0:01f3d38f8b6d 24 #include "freetronicsLCDShield.h"
KKempeneers 0:01f3d38f8b6d 25
KKempeneers 0:01f3d38f8b6d 26 #define PULSE_E wait(0.000001f); \
KKempeneers 0:01f3d38f8b6d 27 _e = 0; \
KKempeneers 0:01f3d38f8b6d 28 wait(0.000001f); \
KKempeneers 0:01f3d38f8b6d 29 _e = 1;
KKempeneers 0:01f3d38f8b6d 30
KKempeneers 0:01f3d38f8b6d 31
KKempeneers 0:01f3d38f8b6d 32 freetronicsLCDShield::freetronicsLCDShield (PinName rs, PinName e, PinName d0, PinName d1, PinName d2, PinName d3, PinName bl, PinName a0)
KKempeneers 0:01f3d38f8b6d 33 : _rs(rs), _e(e), _d(d0, d1, d2, d3), _bl(bl), _a0(a0) {
KKempeneers 0:01f3d38f8b6d 34 // Class constructor
KKempeneers 0:01f3d38f8b6d 35 // Init the display, wait 15ms to insure the power is up
KKempeneers 0:01f3d38f8b6d 36 _e = true;
KKempeneers 0:01f3d38f8b6d 37 _rs = false;
KKempeneers 0:01f3d38f8b6d 38 wait(0.015f);
KKempeneers 0:01f3d38f8b6d 39
KKempeneers 0:01f3d38f8b6d 40 for (int i = 0; i < 3; i++){
KKempeneers 0:01f3d38f8b6d 41 writeByte(0x3);
KKempeneers 0:01f3d38f8b6d 42 wait(0.00164f); // this command takes 1.64ms, so wait for it
KKempeneers 0:01f3d38f8b6d 43 }
KKempeneers 0:01f3d38f8b6d 44
KKempeneers 0:01f3d38f8b6d 45 writeByte(0x2); // 4-bit mode
KKempeneers 0:01f3d38f8b6d 46 writeCommand(0x28); // Function set 001 BW N F - -
KKempeneers 0:01f3d38f8b6d 47 writeCommand(0x0C); // Display on/off controll 0000 1 D C B (D(isplay) On/Off C(ursor) On/Off B(link) On/Off
KKempeneers 0:01f3d38f8b6d 48 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
KKempeneers 0:01f3d38f8b6d 49 cls();
KKempeneers 0:01f3d38f8b6d 50
KKempeneers 0:01f3d38f8b6d 51 // Set the PWM period to 20ms
KKempeneers 0:01f3d38f8b6d 52 _bl.period_ms(1);
KKempeneers 0:01f3d38f8b6d 53 _bl.write(0.0);
KKempeneers 0:01f3d38f8b6d 54 }
KKempeneers 0:01f3d38f8b6d 55
KKempeneers 0:01f3d38f8b6d 56 void freetronicsLCDShield::setCursorPosition (int line, int col) {
KKempeneers 0:01f3d38f8b6d 57 // Set the new cursorposition
KKempeneers 0:01f3d38f8b6d 58 writeCommand(0x80 + (line * 0x40) + col);
KKempeneers 0:01f3d38f8b6d 59 }
KKempeneers 0:01f3d38f8b6d 60
KKempeneers 0:01f3d38f8b6d 61 void freetronicsLCDShield::setBackLight (bool blStatus) {
KKempeneers 0:01f3d38f8b6d 62 // Switch the backlight on (true) or off (false)
KKempeneers 0:01f3d38f8b6d 63 _bl = (blStatus) ? 1.0 : 0.0;
KKempeneers 0:01f3d38f8b6d 64 }
KKempeneers 0:01f3d38f8b6d 65
KKempeneers 0:01f3d38f8b6d 66 void freetronicsLCDShield::setBackLight (float blIntensity) {
KKempeneers 0:01f3d38f8b6d 67 // Switch the backlight on (true) or off (false)
KKempeneers 0:01f3d38f8b6d 68 _bl = blIntensity;
KKempeneers 0:01f3d38f8b6d 69 }
KKempeneers 0:01f3d38f8b6d 70
KKempeneers 0:01f3d38f8b6d 71 void freetronicsLCDShield::setCursor (bool cStatus, bool blink) {
KKempeneers 0:01f3d38f8b6d 72 int tmp = 0;
KKempeneers 0:01f3d38f8b6d 73
KKempeneers 0:01f3d38f8b6d 74 if (blink) tmp = 0x01;
KKempeneers 0:01f3d38f8b6d 75 if (cStatus) tmp |= 0x02;
KKempeneers 0:01f3d38f8b6d 76 writeCommand(0x0C + tmp);
KKempeneers 0:01f3d38f8b6d 77 }
KKempeneers 0:01f3d38f8b6d 78
KKempeneers 1:ddcefddda4a7 79 void freetronicsLCDShield::shift(bool direction) {
KKempeneers 1:ddcefddda4a7 80 if(direction == LEFT) shiftLeft();
KKempeneers 1:ddcefddda4a7 81 else shiftRight();
KKempeneers 1:ddcefddda4a7 82 }
KKempeneers 1:ddcefddda4a7 83
KKempeneers 1:ddcefddda4a7 84 void freetronicsLCDShield::shiftLeft(void) {
KKempeneers 1:ddcefddda4a7 85 writeCommand(0x18 + 0x04);
KKempeneers 1:ddcefddda4a7 86 }
KKempeneers 1:ddcefddda4a7 87
KKempeneers 1:ddcefddda4a7 88 void freetronicsLCDShield::shiftRight(void) {
KKempeneers 1:ddcefddda4a7 89 writeCommand(0x18);
KKempeneers 0:01f3d38f8b6d 90 }
KKempeneers 0:01f3d38f8b6d 91
KKempeneers 0:01f3d38f8b6d 92 void freetronicsLCDShield::cls(void) {
KKempeneers 0:01f3d38f8b6d 93 // Clear the display and place the cursor at 0, 0
KKempeneers 0:01f3d38f8b6d 94 writeCommand(0x01);
KKempeneers 0:01f3d38f8b6d 95 wait(0.00164f);
KKempeneers 0:01f3d38f8b6d 96 }
KKempeneers 0:01f3d38f8b6d 97
KKempeneers 0:01f3d38f8b6d 98 void freetronicsLCDShield::home(void) {
KKempeneers 0:01f3d38f8b6d 99 // Undo shift operations and place cursor at 0,0
KKempeneers 0:01f3d38f8b6d 100 writeCommand(0x02);
KKempeneers 0:01f3d38f8b6d 101 wait(0.00164f);
KKempeneers 0:01f3d38f8b6d 102 }
KKempeneers 0:01f3d38f8b6d 103
KKempeneers 1:ddcefddda4a7 104 void freetronicsLCDShield::writeCGRAM (char address, const char *ptr, char nbytes) {
KKempeneers 1:ddcefddda4a7 105 // Write the address only once, it is autoincremented
KKempeneers 1:ddcefddda4a7 106 writeCommand(0x40 | address);
KKempeneers 1:ddcefddda4a7 107
KKempeneers 1:ddcefddda4a7 108 // Write the data
KKempeneers 1:ddcefddda4a7 109 for(int i = 0; i < nbytes; i++) {
KKempeneers 1:ddcefddda4a7 110 writeData(*ptr++);
KKempeneers 1:ddcefddda4a7 111 }
KKempeneers 1:ddcefddda4a7 112 }
KKempeneers 1:ddcefddda4a7 113
KKempeneers 0:01f3d38f8b6d 114 // Low level output functions
KKempeneers 0:01f3d38f8b6d 115 void freetronicsLCDShield::writeByte (int byte) {
KKempeneers 0:01f3d38f8b6d 116 // Split the byte in high and low nibble, write high nibble first
KKempeneers 0:01f3d38f8b6d 117 _d = byte >> 4;
KKempeneers 0:01f3d38f8b6d 118 PULSE_E;
KKempeneers 0:01f3d38f8b6d 119 _d = byte >> 0;
KKempeneers 0:01f3d38f8b6d 120 PULSE_E;
KKempeneers 0:01f3d38f8b6d 121 // Most instructions take 40us
KKempeneers 0:01f3d38f8b6d 122 wait(0.000040f);
KKempeneers 0:01f3d38f8b6d 123 }
KKempeneers 0:01f3d38f8b6d 124
KKempeneers 0:01f3d38f8b6d 125 void freetronicsLCDShield::writeData (int data) {
KKempeneers 0:01f3d38f8b6d 126 _rs = true;
KKempeneers 0:01f3d38f8b6d 127 writeByte(data);
KKempeneers 0:01f3d38f8b6d 128 }
KKempeneers 0:01f3d38f8b6d 129
KKempeneers 0:01f3d38f8b6d 130 void freetronicsLCDShield::writeCommand (int command) {
KKempeneers 0:01f3d38f8b6d 131 _rs = false;
KKempeneers 0:01f3d38f8b6d 132 writeByte(command);
KKempeneers 0:01f3d38f8b6d 133 }
KKempeneers 0:01f3d38f8b6d 134
KKempeneers 0:01f3d38f8b6d 135 float freetronicsLCDShield::readButton(void) {
KKempeneers 0:01f3d38f8b6d 136 return(_a0.read());
KKempeneers 0:01f3d38f8b6d 137 }
KKempeneers 0:01f3d38f8b6d 138
KKempeneers 0:01f3d38f8b6d 139 // Virtual functions for stream
KKempeneers 0:01f3d38f8b6d 140 int freetronicsLCDShield::_putc(int value) {
KKempeneers 0:01f3d38f8b6d 141 writeData(value);
KKempeneers 0:01f3d38f8b6d 142 return value;
KKempeneers 0:01f3d38f8b6d 143 }
KKempeneers 0:01f3d38f8b6d 144
KKempeneers 0:01f3d38f8b6d 145 int freetronicsLCDShield::_getc() {
KKempeneers 0:01f3d38f8b6d 146 return -1;
KKempeneers 0:01f3d38f8b6d 147 }