Severe weather alert using NOAA RSS feed
Dependencies: NetServices TextLCD mbed spxml
Fork of News_LCD_display by
main.cpp
- Committer:
- 4180_1
- Date:
- 2012-04-24
- Revision:
- 0:582c6436e759
- Child:
- 1:182ff6aef029
File content as of revision 0:582c6436e759:
#include "mbed.h" #include "EthernetNetIf.h" #include "HTTPClient.h" #include "TextLCD.h" //CNN Tech News RSS Feed - get web page with XML // displays titles on LCD from XML "<title>....title text...</title>" TextLCD lcd(p15, p16, p17, p18, p19, p20); // rs, e, d0-d3 EthernetNetIf eth; HTTPClient http; HTTPResult result; bool completed = false; void request_callback(HTTPResult r) { result = r; completed = true; } int main() { char *tstartXML = "<title>"; //RSS XML start title char *tendXML ="</title>"; //RSS XML end title char *tsptr; char *teptr; int i=0,j=0; // the eth and HTTP code has be taken directly from the HTTPStream documentation page // see http://mbed.org/cookbook/HTTP-Client-Data-Containers lcd.cls(); lcd.printf("net setup"); EthernetErr ethErr = eth.setup(); if (ethErr) { lcd.printf("\n\r net error"); return -1; } lcd.printf("\n\r net ok"); HTTPStream stream; char BigBuf[2048 + 1] = {0}; stream.readNext((byte*)BigBuf, 2048); //Point to buffer for the first read //CNN Tech News RSS Feed - get web page with XML HTTPResult r = http.get("HTTP://rss.cnn.com/rss/cnn_tech.rss", &stream, request_callback); while (!completed) { Net::poll(); // Polls the Networking stack if (stream.readable()) { // check for end of file BigBuf[stream.readLen()] = 0; // Transform this buffer in a zero-terminated char* string tsptr = BigBuf; // displays titles on LCD from XML "<title>....title text...</title>" do { 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)) { 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); } } while (tsptr!=NULL); // No more "<title>"s in BigBuf to display stream.readNext((byte*)BigBuf, 2048); //Buffer has been read, now we can put more data in it } } lcd.cls(); if (result == HTTP_OK) { lcd.cls(); lcd.printf(" Read complete\n\r"); } else { lcd. printf(" Error %d\n", result); return -1; } }