main.cpp

#include "mbed.h"
#include "EthernetInterface.h"
#include "TextLCD.h"
#include "HTTPClient.h"

TextLCD lcd(p15, p16, p17, p18, p19, p20); // rs, e, d0-d3
DigitalOut led3(LED3); // use for debug
HTTPClient http;

int main() {
    int connection;
    lcd.cls();
    lcd.printf("net setup");
    EthernetInterface eth;
    eth.init(); //Use DHCP
    connection = eth.connect(60000);
    if (connection != 0) {
        lcd.cls();
        lcd.printf("No Connection");
    }
    char buffer[300];
    
    int ret = http.get("http://www.reddit.com/r/todayilearned/hot.xml?limit=1", buffer, 1000);
    
    lcd.cls();
    if (ret == 0) {
        lcd.printf("Success!");
    } else {
        lcd.printf("Failed");
    }
    
    char *tstartXML = "<item><title>"; //XML beginning of string
    char *tendXML ="</title><link>"; //XML end of string
    char *tsptr;
    char *teptr;
    int i=0,j=0;
    printf(buffer);
    while (true) {
        tsptr = buffer;
        tsptr = strstr(tsptr,tstartXML); // find <title> in string - NULL if not
        teptr = strstr(tsptr,tendXML); // find <\title> in string - NULL if not
        if (tsptr!=NULL) tsptr = tsptr + strlen(tstartXML);// move to char after "<title>"
        if ((tsptr!=NULL)&&(teptr!=NULL)) {
            led3 = 1;
            i=0;
            // loop to scroll characters slowly across LCD
            for (j=0; (j+15)<(strlen(tsptr)-strlen(teptr)); j++) {
                lcd.cls(); // clear screen before writing a new line
                // loop to output a line on the LCD
                for (i=0; ((i<16)&&(tsptr[i+j-1] != '<')); i++) {
                    lcd.putc(tsptr[i+j]);
                }
                if (j==0) wait(1.2); //add first line delays for scroll timing
                wait(.2); //delay for charcter scroll timing
            }
            wait(.4);
            //lcd.cls(); //clear LCD between news items
            wait(.2);
        } else {
        }
        if (ret < 0) {
            break;
        }
    }
    eth.disconnect();
}