LED_Bar.cpp

00001 /*
00002 LED bar library V1.0
00003 2010 Copyright (c) Seeed Technology Inc. All right reserved.
00004 
00005 Original Author: LG
00006 
00007 Modify: Mihail Stoyanov (mihail.stoyanov@arm.com) for ARM mbed, 2014-07-30
00008 User can choose which Io to be used.
00009 This library is free software; you can redistribute it and/or
00010 modify it under the terms of the GNU Lesser General Public
00011 License as published by the Free Software Foundation; either
00012 version 2.1 of the License, or (at your option) any later version.
00013 
00014 This library is distributed in the hope that it will be useful,
00015 but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00017 Lesser General Public License for more details.
00018 
00019 You should have received a copy of the GNU Lesser General Public
00020 License along with this library; if not, write to the Free Software
00021 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
00022 */
00023 
00024 #include "LED_Bar.h"
00025 
00026 LED_Bar::LED_Bar(PinName pinClk, PinName pinDta) : __pinClk(pinClk), __pinDta(pinDta)
00027 {
00028     __led_state = 0x00;
00029 }
00030 
00031 void LED_Bar::latchData()
00032 {
00033     __pinDta = 0;
00034     wait_us(10);
00035 
00036     for(int i=0; i<4; i++) {
00037         __pinDta = 1;
00038         __pinDta = 0;
00039     }
00040 
00041 }
00042 
00043 void LED_Bar::send16bitData(unsigned int data)
00044 {
00045     for(int i=0; i<16; i++) {
00046         unsigned int state = data & 0x8000 ? 1 : 0;
00047         __pinDta = state;
00048 
00049         state = __pinClk ? 0 : 1;
00050         __pinClk = state;
00051 
00052         data <<= 1;
00053     }
00054 }
00055 
00056 void LED_Bar::ledIndexBit(unsigned int index_bits)
00057 {
00058 
00059     send16bitData(CMDMODE);
00060 
00061     for (int i=0; i<12; i++) {
00062         unsigned int state = (index_bits&0x0001) ? ON : SHUT;
00063         send16bitData(state);
00064 
00065         index_bits = index_bits>>1;
00066     }
00067 
00068     latchData();
00069 }
00070 
00071 void LED_Bar::setLevel(int level)
00072 {
00073 
00074     if(level>10)return;
00075 
00076     send16bitData(CMDMODE);
00077 
00078     for(int i=0; i<12; i++) {
00079         unsigned int state1 = (i<level) ? ON : SHUT;
00080 
00081         send16bitData(state1);
00082     }
00083 
00084     latchData();
00085 }
00086 
00087 void LED_Bar::setSingleLed(int num, int st)
00088 {
00089     if(num>10)return;
00090     __led_state = st ? (__led_state | (0x01<<num)) : (__led_state & ~(0x01<<num));
00091     ledIndexBit(__led_state);
00092 
00093 }