Layton Balliet
Updated version of Jim Hamblen's Nokia LCD weather App. Updated to suport Yahoo!'s weather API instead of the Google API. Also removed extraneous Libraries.
Dependencies: NetServices mbed spxml
Fork of
weather_Nokia_LCD_display
by 
jim hamblen
main.cpp@0:4a917644acc4, 2012-05-25 (annotated)
- Committer:
- 4180_1
- Date:
- Fri May 25 00:57:24 2012 +0000
- Revision:
- 0:4a917644acc4
- Child:
- 1:c96f140b5710
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| 4180_1 | 0:4a917644acc4 | 1 | #include "mbed.h" |
| 4180_1 | 0:4a917644acc4 | 2 | #include "EthernetNetIf.h" |
| 4180_1 | 0:4a917644acc4 | 3 | #include "HTTPClient.h" |
| 4180_1 | 0:4a917644acc4 | 4 | #include "spdomparser.hpp" |
| 4180_1 | 0:4a917644acc4 | 5 | #include "spxmlnode.hpp" |
| 4180_1 | 0:4a917644acc4 | 6 | #include "spxmlhandle.hpp" |
| 4180_1 | 0:4a917644acc4 | 7 | #include "NokiaLCD.h" |
| 4180_1 | 0:4a917644acc4 | 8 | // Internet of Things weather display example: LCD displays LA current weather via internet Google API |
| 4180_1 | 0:4a917644acc4 | 9 | // Adapted for LCD from http://mbed.org/users/hlipka/programs/spxmltest_weather/lif782 |
| 4180_1 | 0:4a917644acc4 | 10 | |
| 4180_1 | 0:4a917644acc4 | 11 | NokiaLCD lcd(p5, p7, p8, p9, NokiaLCD::LCD6610); // mosi, sclk, cs, rst, type |
| 4180_1 | 0:4a917644acc4 | 12 | EthernetNetIf eth; |
| 4180_1 | 0:4a917644acc4 | 13 | HTTPClient http; |
| 4180_1 | 0:4a917644acc4 | 14 | HTTPResult result; |
| 4180_1 | 0:4a917644acc4 | 15 | bool completed = false; |
| 4180_1 | 0:4a917644acc4 | 16 | void request_callback(HTTPResult r) { |
| 4180_1 | 0:4a917644acc4 | 17 | result = r; |
| 4180_1 | 0:4a917644acc4 | 18 | completed = true; |
| 4180_1 | 0:4a917644acc4 | 19 | } |
| 4180_1 | 0:4a917644acc4 | 20 | |
| 4180_1 | 0:4a917644acc4 | 21 | void parseWeather(SP_XmlElementNode *node) { |
| 4180_1 | 0:4a917644acc4 | 22 | //extracts current weather XML data fields for LCD |
| 4180_1 | 0:4a917644acc4 | 23 | SP_XmlHandle handle(node); |
| 4180_1 | 0:4a917644acc4 | 24 | SP_XmlElementNode * condition = handle.getChild( "condition" ).toElement(); |
| 4180_1 | 0:4a917644acc4 | 25 | lcd.cls(); |
| 4180_1 | 0:4a917644acc4 | 26 | lcd.locate(0,2); |
| 4180_1 | 0:4a917644acc4 | 27 | lcd.printf("LA:"); |
| 4180_1 | 0:4a917644acc4 | 28 | if (condition) { |
| 4180_1 | 0:4a917644acc4 | 29 | lcd.printf("%s ",condition->getAttrValue("data")); |
| 4180_1 | 0:4a917644acc4 | 30 | } |
| 4180_1 | 0:4a917644acc4 | 31 | SP_XmlElementNode * tempf = handle.getChild( "temp_f" ).toElement(); |
| 4180_1 | 0:4a917644acc4 | 32 | if (tempf) { |
| 4180_1 | 0:4a917644acc4 | 33 | lcd.printf(" %sF",tempf->getAttrValue("data")); |
| 4180_1 | 0:4a917644acc4 | 34 | } |
| 4180_1 | 0:4a917644acc4 | 35 | SP_XmlElementNode * humidity = handle.getChild( "humidity" ).toElement(); |
| 4180_1 | 0:4a917644acc4 | 36 | if (humidity) { |
| 4180_1 | 0:4a917644acc4 | 37 | lcd.locate(0,3); |
| 4180_1 | 0:4a917644acc4 | 38 | lcd.printf("%s",humidity->getAttrValue("data")); |
| 4180_1 | 0:4a917644acc4 | 39 | } |
| 4180_1 | 0:4a917644acc4 | 40 | } |
| 4180_1 | 0:4a917644acc4 | 41 | |
| 4180_1 | 0:4a917644acc4 | 42 | int main() { |
| 4180_1 | 0:4a917644acc4 | 43 | // the eth and HTTP code has be taken directly from the HTTPStream documentation page |
| 4180_1 | 0:4a917644acc4 | 44 | // see http://mbed.org/cookbook/HTTP-Client-Data-Containers |
| 4180_1 | 0:4a917644acc4 | 45 | lcd.cls(); |
| 4180_1 | 0:4a917644acc4 | 46 | lcd.locate(0,2); |
| 4180_1 | 0:4a917644acc4 | 47 | lcd.printf("net setup"); |
| 4180_1 | 0:4a917644acc4 | 48 | lcd.locate(0,3); |
| 4180_1 | 0:4a917644acc4 | 49 | EthernetErr ethErr = eth.setup(); |
| 4180_1 | 0:4a917644acc4 | 50 | if (ethErr) { |
| 4180_1 | 0:4a917644acc4 | 51 | lcd.printf("Error in setup"); |
| 4180_1 | 0:4a917644acc4 | 52 | return -1; |
| 4180_1 | 0:4a917644acc4 | 53 | } |
| 4180_1 | 0:4a917644acc4 | 54 | lcd.printf("net ok"); |
| 4180_1 | 0:4a917644acc4 | 55 | |
| 4180_1 | 0:4a917644acc4 | 56 | SP_XmlDomParser parser; |
| 4180_1 | 0:4a917644acc4 | 57 | HTTPStream stream; |
| 4180_1 | 0:4a917644acc4 | 58 | |
| 4180_1 | 0:4a917644acc4 | 59 | char BigBuf[512 + 1] = {0}; |
| 4180_1 | 0:4a917644acc4 | 60 | stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read |
| 4180_1 | 0:4a917644acc4 | 61 | //Google Weather API for Los Angeles - get web page with XML |
| 4180_1 | 0:4a917644acc4 | 62 | HTTPResult r = http.get("http://www.google.com/ig/api?weather=Los+Angeles", &stream, request_callback); |
| 4180_1 | 0:4a917644acc4 | 63 | while (!completed) { |
| 4180_1 | 0:4a917644acc4 | 64 | Net::poll(); //Polls the Networking stack |
| 4180_1 | 0:4a917644acc4 | 65 | if (stream.readable()) { |
| 4180_1 | 0:4a917644acc4 | 66 | BigBuf[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string |
| 4180_1 | 0:4a917644acc4 | 67 | parser.append( BigBuf, strlen(BigBuf)); // stream current buffer data to the XML parser |
| 4180_1 | 0:4a917644acc4 | 68 | stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it |
| 4180_1 | 0:4a917644acc4 | 69 | } |
| 4180_1 | 0:4a917644acc4 | 70 | } |
| 4180_1 | 0:4a917644acc4 | 71 | lcd.cls(); |
| 4180_1 | 0:4a917644acc4 | 72 | lcd.locate(0,2); |
| 4180_1 | 0:4a917644acc4 | 73 | if (result == HTTP_OK) { |
| 4180_1 | 0:4a917644acc4 | 74 | lcd.printf(" Read complete"); |
| 4180_1 | 0:4a917644acc4 | 75 | } else { |
| 4180_1 | 0:4a917644acc4 | 76 | lcd. printf(" Error %d", result); |
| 4180_1 | 0:4a917644acc4 | 77 | return -1; |
| 4180_1 | 0:4a917644acc4 | 78 | } |
| 4180_1 | 0:4a917644acc4 | 79 | |
| 4180_1 | 0:4a917644acc4 | 80 | SP_XmlHandle rootHandle( parser.getDocument()->getRootElement() ); |
| 4180_1 | 0:4a917644acc4 | 81 | SP_XmlElementNode * child2 = rootHandle.getChild( "weather" ) |
| 4180_1 | 0:4a917644acc4 | 82 | .getChild( "current_conditions").toElement(); |
| 4180_1 | 0:4a917644acc4 | 83 | if ( child2 ) { |
| 4180_1 | 0:4a917644acc4 | 84 | parseWeather(child2); //parses XML "current-conditions" info |
| 4180_1 | 0:4a917644acc4 | 85 | } |
| 4180_1 | 0:4a917644acc4 | 86 | |
| 4180_1 | 0:4a917644acc4 | 87 | if ( NULL != parser.getError() ) { |
| 4180_1 | 0:4a917644acc4 | 88 | lcd.printf( "\n error: %s\n", parser.getError() ); |
| 4180_1 | 0:4a917644acc4 | 89 | } |
| 4180_1 | 0:4a917644acc4 | 90 | } |