Ameya Ainapure
Live RSS feeds from ethernet on a 16X2 LCD
Dependencies: EthernetNetIf mbed
Revision 0:92d9235b910a, committed 2010-10-12
- Comitter:
- amli1016
- Date:
- Tue Oct 12 14:19:29 2010 +0000
- Commit message:
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EthernetNetIf.lib Tue Oct 12 14:19:29 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/EthernetNetIf/#bc7df6da7589
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPClient.lib Tue Oct 12 14:19:29 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/HTTPClient/#d97a4fc01c86
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Tue Oct 12 14:19:29 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/TextLCD/#a53b3e2d6f1e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Oct 12 14:19:29 2010 +0000
@@ -0,0 +1,215 @@
+#include "mbed.h"
+#include "EthernetNetIf.h"
+#include "HTTPClient.h"
+#include "TextLCD.h"
+//#include "TextLCD_SlideMessage.cpp"
+TextLCD lcd(p10, p12, p15, p16, p29, p30);
+EthernetNetIf eth;
+HTTPClient http;
+int p=0;
+int c=0;
+int gl=0;
+HTTPResult result;
+bool completed = false;
+
+void request_callback(HTTPResult r)
+{
+ result = r;
+ completed = true;
+}
+
+int checks(char *a) // parsing function returns the startin poshition of the RSS feed in the current buffer
+{
+
+ int i=gl;
+ // printf("%d\n\r",i);
+ if(p==1)
+ {
+ p=0;
+ if(a[0]=='t')
+ {
+ //c=1;
+ gl=i+8;
+ return i+7;
+ }
+ }
+ for(;i<512;i++)
+ {
+ // printf("%d",i);
+ if(i==511)
+ {
+ if(a[i]=='<')
+ {
+ p=1;
+ gl=0;
+ return -1;
+ }
+ else
+ {
+ gl=0;
+ return -1;
+ }
+ }
+ if (a[i]=='<') // check if "<t" appears
+ {
+ if(a[i+1]=='t')
+ {
+ //if(a[i+2]=='i')
+ {
+ //c=1;
+
+ // printf("%c",a[i+2]);
+ if(i+7>511)
+ {
+ c=(i+7-511);
+ gl=0;
+ return -1;
+ }
+ else
+ {
+ gl=i+8;
+ return i+7; // return the starting position of the feed
+ }
+ }
+ }
+ }
+ }
+ }
+int main() {
+
+ int i=0;
+ printf("Start\n");
+
+ printf("Setting up...\n");
+ EthernetErr ethErr = eth.setup();
+ if(ethErr)
+ {
+ printf("Error %d in setup.\n", ethErr);
+ return -1;
+ }
+ printf("Setup OK\n");
+
+ HTTPStream stream;
+ while(1)
+ {
+ completed=false;
+ char BigBuf[512 + 1] = {0};
+ stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read
+
+ HTTPResult r = http.get("HTTP://rss.cnn.com/rss/cnn_tech.rss", &stream, request_callback); //Load a very large page, such as the hackaday RSS feed
+
+ while(!completed)
+ {
+ Net::poll(); //Polls the Networking stack
+ //printf("a");
+ if(stream.readable())
+ {
+
+
+ int cnt=0;
+ while(cnt!=-1) // cnt = -1 if the current buffer is fully read
+ {
+ if (c!=0)
+ {
+ i=c-1;
+ c=0;
+ goto abcd;
+ }
+
+ cnt=checks(BigBuf);
+ if(cnt==-1)
+ {
+ break;
+ }
+ printf("\n\r");
+ // printf("%d",cnt );
+ i =cnt;
+abcd:
+ {
+
+ // Print on LCD in rolling fashion
+ {
+ for (j = 15 ; j>=0 ; j-- ){
+
+ for (int k = j ; k <= 15 ; k++ ){
+ if((i+k-j)==512)
+ {
+ i=-10;
+ goto efgh;
+
+ }
+ lcd.locate(k,0);
+ if ( BigBuf[i+k-j]!='<' ) // Checks for the end of RSS feed
+ lcd.printf("%c",BigBuf[i+k-j]) ;
+ else
+ {
+ lcd.cls();
+ goto efgh;
+ }
+ }
+ wait(0.18) ;
+ }
+
+ for ( int j = 1 ; BigBuf[i+j] != '<' ; j++ ){
+ for ( int k = 0; k < 16 ; k++ ){
+ if((i+k+j)==512)
+ {
+ i=-10;
+ goto efgh;
+
+ }
+ lcd.locate(k,0) ;
+
+ if( BigBuf[i+k + j]!='<' )
+ {
+ lcd.printf("%c",BigBuf[i+k+j]) ;
+ }
+ else
+ {
+ lcd.printf(" ") ;
+ lcd.cls();
+ goto efgh;
+ }
+ }
+ wait(0.18) ;
+ }
+ }
+
+
+
+efgh: if(i==-10) // If the buffer is full and the entire feed is not gisplayed
+ {
+
+ c=1;
+ goto xyz;
+ }
+ }
+
+ }
+
+
+
+xyz: stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it
+ }
+ }
+
+
+ printf("\n--------------\n");
+ if(result == HTTP_OK)
+ {
+ printf("Read completely\n");
+ }
+ else
+ {
+ printf("Error %d\n", result);
+ }
+ wait(5); // Continuously receive feeds
+ }
+ while(1)
+ {
+
+ }
+
+ return 0;
+
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Oct 12 14:19:29 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e