Patrick Amrein
Live RSS news feeds are displayed on a basic text LCD See http://mbed.org/users/4180_1/notebook/news-lcd-display/
Dependencies: NetServices TextLCDfor mbed spxml
Fork of
News_LCD_display
by 
jim hamblen
Reads the RSS-Fedd of the ZVV and prints the current state of the public transports on a LCD
Revision 1:27033a7fe75c, committed 2014-02-22
- Comitter:
- 18padx08
- Date:
- Sat Feb 22 22:19:53 2014 +0000
- Parent:
- 0:582c6436e759
- Child:
- 2:6aaaf927e994
- Commit message:
- changed link to ZVV rss feed
Changed in this revision
--- a/HTTPClient.lib Tue Apr 24 02:27:43 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -http://mbed.org/users/donatien/code/HTTPClient/#d0be6af2d1db
--- a/TextLCD.lib Tue Apr 24 02:27:43 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCDfor.lib Sat Feb 22 22:19:53 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/18padx08/code/TextLCDfor/#b0b747a8cb5b
--- a/main.cpp Tue Apr 24 02:27:43 2012 +0000
+++ b/main.cpp Sat Feb 22 22:19:53 2014 +0000
@@ -4,22 +4,21 @@
#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
+TextLCD lcd(p26,p25,p24,p23,p22,p20,p19,TextLCD::LCD20x4); // rs, e, d0-d3
EthernetNetIf eth;
HTTPClient http;
HTTPResult result;
bool completed = false;
-void request_callback(HTTPResult r) {
+void loadZVVNews();
+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;
+int main()
+{
+
// 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();
@@ -30,11 +29,78 @@
return -1;
}
lcd.printf("\n\r net ok");
+ wait(0.5);
+ lcd.cls();
+ /* 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://online.fahrplan.zvv.ch/bin/help.exe/dn?tpl=rss_feed_VBZ", &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<(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]);
+ }
+ lcd.putc(tsptr[j]);
+ //if (j==0) wait(1.2); //add first line delays for scroll timing
+ wait(.1); //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
+ }
+ }*/
+ loadZVVNews();
+ while(true) {
+ completed = false;
+ if (result == HTTP_OK) {
+
+ lcd.printf("Reload in 5 sec\n");
+
+ wait(5);
+ lcd.cls();
+ loadZVVNews();
+
+ //lcd.cls();
+ //lcd.printf(" Read complete\n\r");
+ } else {
+ lcd. printf(" Error %d\n", result);
+ wait(1.2);
+ lcd.cls();
+ loadZVVNews();
+ }
+ }
+}
+
+void loadZVVNews()
+{
+ char *tstartXML = "<title>"; //RSS XML start title
+ char *tendXML ="</title>"; //RSS XML end title
+ char *tsptr;
+ char *teptr;
+ int j=0;
HTTPStream stream;
- char BigBuf[2048 + 1] = {0};
- stream.readNext((byte*)BigBuf, 2048); //Point to buffer for the first read
+ char BigBuf[4096 + 1] = {0};
+ stream.readNext((byte*)BigBuf, 4096); //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);
+ HTTPResult r = http.get("http://online.fahrplan.zvv.ch/bin/help.exe/dn?tpl=rss_feed_VBZ", &stream, request_callback);
while (!completed) {
Net::poll(); // Polls the Networking stack
if (stream.readable()) { // check for end of file
@@ -46,31 +112,25 @@
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;
+ //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
+ for (j=0; j<(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++) {
+ /*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
+ }*/
+ lcd.putc(tsptr[j]);
+ //if (j==0) wait(1.2); //add first line delays for scroll timing
+ //delay for charcter scroll timing
}
- wait(.4);
+ wait(2.5);
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
+ stream.readNext((byte*)BigBuf, 4096); //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;
- }
-}
+}
\ No newline at end of file