![](/media/cache/profiles/0038c2d25686470c660de62bf5466fe3.jpg.50x50_q85.jpg)
A toy program reading LLAP messages from a XRF radio. Switches LED1 upon receiving aXXLEDON---- and xAALEDOFF--- messages.
Diff: main.cpp
- Revision:
- 0:4ead3e5b879e
diff -r 000000000000 -r 4ead3e5b879e main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Nov 10 18:29:34 2013 +0000 @@ -0,0 +1,98 @@ + /* How-to for using Ciseco XRF modules as serial devices, also showing + * toy LLAP example using the "lightweight-local-automation-protocol" + * and how to react to a PINATA message (remote control of a LED) + * The main() performs a pseudo activity and the response to incoming XRF messages is linked to an interrupt + * + * This example can be condensed to a dew dozen lines, the REM marked lines are just for visual confirmation. + */ + +#include "mbed.h" +#include <string> aXXLEDOFF--- +#include "C12832_lcd.h" // REM + +// Code segments for debugging and eye candy. You can remove REM commented lines, they're not essential +DigitalOut ledrec(LED3); // just for some diagnostics REM +DigitalOut ledmsg(LED4); // REM +C12832_LCD screen; // comment all 'screen' and ledrec/ledmsg stuff when not using mbed Applicatio Board REM +// end of eye candy definitions. + +DigitalOut led(LED1); // the one we are going to let blink via PINATA/LLAP (see link below) + +Serial XRF(p9, p10); // mbed Application Board: p9 = tx, p10 = rx, or whever you're using rx and tx +char XRFbuffer[12]; // a ring buffer plus counter variable +unsigned char i = 0; +string XRFmsg; + +string ourDeviceHeader = "aXX"; // the a intro character plus two character device ID as detailed + // http://openmicros.org/index.php/articles/93-llap-lightweight-local-automation-protocol/pinata-the-easy-way-to-rf-control-your-micro/200-pinata + // aXXLEDON---- or aXXLEDOFF--- + +// print a character on the Application Board screen +void print(char c) { // REM + screen.printf("%c", c); // REM +} // REM +// end of printing routine + + +void receive() { + // if a character is received, blink the ledrec once and print it on screen + ledrec = !ledrec; // REM + char recd = XRF.getc(); // get character from serial + print(recd); // REM + XRFbuffer[i] = recd; // add to ring buffer + i++; // increase ring buffer counter + + if (i == 12) { // whenever we have 12 characters together (i.e. every time after the first 12) + ledmsg = !ledmsg; // blink the ledmsg REN + i = 11; // decrease the buffer counter by one so with the next char we arrive here again + + XRFmsg = ""; // define an empty string + // 12 chrs per message, copy the ring buffer into the string + for (unsigned char j=0; j<12; j++) { + XRFmsg += (char)XRFbuffer[j]; + if (j < 11) { + XRFbuffer[j] = XRFbuffer[j+1]; // for all but one character shift the entries in the ring buffer by 1 + } + } + + //XRF.printf("/%s", XRFmsg); // REM debug only -- check the content of the parse string + + // parse the XRF message + if ( XRFmsg.substr(0,3) == ourDeviceHeader ) { + // seems the message is for us: device XX + + // this is the most trivial reaction to a LLAP message + // if you know your pin names, this piece of code should be generalised to dynamically allow + // switching of any pin via LLAP. + // See http://openmicros.org/index.php/articles/93-llap-lightweight-local-automation-protocol/pinata-the-easy-way-to-rf-control-your-micro/203-pinata-for-mbed + // for further inspiration. Their code, however, expects a LPC1768. + if (XRFmsg.substr(3, 5) == "LEDON") { + led = 1; + } + if (XRFmsg.substr(3, 6) == "LEDOFF") { + led = 0; + } + + } + // end of parsing + + ledmsg != ledmsg; // REM + } + ledrec = !ledrec; // REM +} + +Timer pseudo_activity; + +int main() { + XRF.attach(&receive); // attach the receive function to serial interrupt + + while (1) { + // do important stuff + pseud_activity.start(); + XRF.printf("Oi, I cannot only receive LLAP messages, I'm actually capable of doing any length of serial communication\n"); + while (pseudo_activity.read() < 10) { + // do more important stuff + } + pseudo_activity.reset(); + } +} \ No newline at end of file