main.cpp

00001 #include "mbed.h"
00002 #include "TextLCD.h"
00003 
00004 PinName pin_CDS = PB_0;
00005 PinName pin_LEDR = PB_6;
00006 PinName pin_LEDG = PB_5;
00007 PinName pin_LEDB = PB_4;
00008 
00009 AnalogIn adc_CDS(pin_CDS);
00010 
00011 // rs, rw, e, d0-d3
00012 TextLCD lcd(PB_12, PB_13, PB_14, PB_15, PA_9, PA_10, PA_11); 
00013 
00014 PwmOut LEDR(pin_LEDR);
00015 PwmOut LEDG(pin_LEDG);
00016 PwmOut LEDB(pin_LEDB);
00017 
00018 float LED_Ctrl(int value);
00019 
00020 int main() {
00021 
00022     int ADC_Data;
00023     float Brightness;
00024     LEDR = LED_Ctrl(0);
00025     LEDG = LED_Ctrl(0);
00026     LEDB = LED_Ctrl(0);
00027 
00028     lcd.printf(" ADC Data :     \n");
00029     lcd.printf(""); 
00030     while(1) {
00031         ADC_Data = adc_CDS.read()*4095;
00032         lcd.locate(12, 0);
00033         lcd.printf("%4d", ADC_Data);
00034         if(ADC_Data > 3000)
00035             ADC_Data = 3000;
00036         ADC_Data /= 30;
00037         Brightness = (100.0 - ADC_Data) / 100;
00038         LEDR = Brightness;
00039         LEDG = Brightness;
00040         LEDB = Brightness;
00041         wait(0.5);
00042     }
00043 }
00044 
00045 // brightness Control 0 ~ 100(%)
00046 float LED_Ctrl(int value)
00047 {
00048     float brightness = value;
00049     brightness /= 100;
00050     return brightness;
00051 }