main.cpp

00001 #include "mbed.h"
00002 
00003 //Function prototype
00004 void doSample1Hz();
00005 
00006 //Global objects
00007 Serial pc(USBTX, USBRX);
00008 AnalogIn POT_ADC_In(A0);
00009 DigitalOut led1(LED1);
00010 DigitalOut led2(LED2);
00011 
00012 //Shared variables
00013 volatile static unsigned short sample16 = 0;
00014 
00015 //The ticker, used to sample data at a fixed rate
00016 Ticker t;
00017 
00018 //Main function
00019 int main()
00020 {
00021     //Set baud rate to 115200
00022     pc.baud(115200);
00023 
00024     //Power on self test
00025     led1 = 1; led2 = 1;
00026     pc.printf("TESTING\n\r");
00027     wait(1.0);
00028     led1 = 1; led2 = 1;
00029     pc.printf("DONE\n\r");
00030     wait(1.0);
00031 
00032     //Set up the ticker - 1Hz
00033     t.attach(doSample1Hz, 1.0);
00034 
00035     while(1) {
00036 
00037         //Sleep
00038         sleep();
00039 
00040         //READ ADC as an unsigned integer.
00041         //Shift right 4 bits (this is a 12bit ADC) & store in static global variable
00042         sample16 = POT_ADC_In.read_u16() >> 4;
00043         
00044         //Hardware debug to verify this is working
00045         led2 = !led2;
00046         
00047         //Display the sample in HEX
00048         pc.printf("ADC Value: %X\n", sample16);
00049         //Wait for 20 characters to clear 
00050         wait(0.0014);
00051  
00052     } //end while(1)
00053 } //end main
00054 
00055 //ISR for the ticker - simply there to perform sampling
00056 void doSample1Hz() {
00057     //Toggle on board led
00058     led1 = !led1;
00059 }
00060