jim hamblen
Live RSS news feeds are displayed on a basic text LCD See http://mbed.org/users/4180_1/notebook/news-lcd-display/
Dependencies: NetServices TextLCD mbed spxml HTTPClient_ToBeRemoved
Revision 0:582c6436e759, committed 2012-04-24
- Comitter:
- 4180_1
- Date:
- Tue Apr 24 02:27:43 2012 +0000
- Commit message:
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPClient.lib Tue Apr 24 02:27:43 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/HTTPClient/#d0be6af2d1db
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NetServices.lib Tue Apr 24 02:27:43 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/segundo/code/NetServices/#966a0265edfc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Tue Apr 24 02:27:43 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Apr 24 02:27:43 2012 +0000
@@ -0,0 +1,76 @@
+#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;
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Apr 24 02:27:43 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/spxml.lib Tue Apr 24 02:27:43 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/hlipka/code/spxml/#3fa97f2c0505