main.cpp

00001 #include "mbed.h"
00002 
00003 PwmOut myled(p21);
00004 DigitalIn button1(p30);
00005 DigitalIn button2(p29);
00006 DigitalIn switch1(p8);
00007 DigitalOut myled4(LED4);
00008 DigitalOut myled3(LED3);
00009 float intensity = 0.5f;
00010 
00011 
00012 class Watchdog {
00013 public:
00014 // Load timeout value in watchdog timer and enable
00015     void kick(float s) {
00016         LPC_WDT->WDCLKSEL = 0x1;                // Set CLK src to PCLK
00017         uint32_t clk = SystemCoreClock / 16;    // WD has a fixed /4 prescaler, PCLK default is /4
00018         LPC_WDT->WDTC = s * (float)clk;
00019         LPC_WDT->WDMOD = 0x3;                   // Enabled and Reset
00020         kick();
00021     }
00022 // "kick" or "feed" the dog - reset the watchdog timer
00023 // by writing this required bit pattern
00024     void kick() {
00025         LPC_WDT->WDFEED = 0xAA;
00026         LPC_WDT->WDFEED = 0x55;
00027     }
00028 };
00029  
00030 // Setup the watchdog timer
00031 Watchdog wdt;
00032 
00033 
00034 int main() {
00035     
00036     int count = 0;
00037     wdt.kick(5.0);
00038     if ((LPC_WDT->WDMOD >> 2) & 1)
00039         myled4 = 1; else myled3 = 1;
00040         wait(2);
00041         myled4 = 0;
00042         myled3 = 0;
00043 
00044      
00045     
00046     while(1) {
00047         if (button1 == 0)  {
00048             if (intensity <= 1.0f) {
00049                 intensity += 0.07f;
00050             }
00051         }
00052         if (button2 == 0) {
00053             if (intensity >= 0.0f) {
00054                 intensity -= 0.07f;
00055             }
00056         }
00057         if (switch1 == 0) {
00058             myled = intensity;
00059         }
00060         else {
00061             myled = 0.0f;
00062             }
00063         wait(0.1);
00064         count++;
00065         if (count == 70) {
00066             wait(11);
00067             }
00068         wdt.kick(); //kick the watchdog timer
00069     }
00070 }