Revision 1:09e016eea608, committed 2012-02-08

Comitter:

madcowswe

Date:

Wed Feb 08 16:51:49 2012 +0000

Parent:

0:048b717be6c0

Commit message:

Working lib for qq v2

Changed in this revision

diff -r 048b717be6c0 -r 09e016eea608 RF12B.cpp
--- a/RF12B.cpp	Fri Mar 11 18:02:05 2011 +0000
+++ b/RF12B.cpp	Wed Feb 08 16:51:49 2012 +0000
@@ -1,8 +1,7 @@
 #include "RF12B.h"
 
 #include "RF_defs.h"
-
-DigitalOut rfled(LED3);
+#include <algorithm>
 
 RF12B::RF12B(PinName _SDI,
              PinName _SDO,
@@ -58,6 +57,7 @@
 /* Sends a packet of data to the RF module for transmission TODO: Make asych*/
 void RF12B::write(unsigned char *data, unsigned char length) {
     unsigned char crc = 0;
+        
     /* Transmitter mode */
     changeMode(TX);
 
@@ -92,6 +92,48 @@
     write(&data, 1);
 }
 
+void RF12B::write(queue<char> &data, int length) {
+    char crc = 0;
+    char length_byte = 0;
+    
+    /* -1 means try to transmit everything in the queue */
+    if(length == -1) {
+        length = data.size();
+    }
+    
+    /* max length of packet is 255 */
+    length_byte = min(length, 255);
+    
+    /* Transmitter mode */
+    changeMode(TX);
+
+    writeCmd(0x0000);
+    send(0xAA); // PREAMBLE
+    send(0xAA);
+    send(0xAA);
+    send(0x2D); // SYNC
+    send(0xD4);
+    /* Packet Length */
+    send(length_byte);
+    crc = crc8(crc, length_byte);
+    send(crc);
+    crc = crc8(crc, crc);
+    /* Packet Data */
+    for (char i=0; i<length_byte; i++) {
+        send(data.front());
+        crc = crc8(crc, data.front());
+        data.pop();
+    }
+    send(crc);
+    send(0xAA); // DUMMY BYTES
+    send(0xAA);
+    send(0xAA);
+
+    /* Back to receiver mode */
+    changeMode(RX);
+    status();
+}
+
 /**********************************************************************
  *  PRIVATE FUNCTIONS
  *********************************************************************/
@@ -194,6 +236,7 @@
         // I think this will slow down the pll's reaction time. Not sure, check with someone!
     );
 
+    changeMode(RX);
     resetRX();
     status();
 }
@@ -213,8 +256,9 @@
 }
 
 /* Change the mode of the RF module to Transmitting or Receiving */
-void RF12B::changeMode(rfmode_t mode) {
-    if (mode == TX) {
+void RF12B::changeMode(rfmode_t _mode) {
+    mode = _mode;
+    if (_mode == TX) {
         writeCmd(0x8239); //!er,!ebb,ET,ES,EX,!eb,!ew,DC
     } else { /* mode == RX */
         writeCmd(0x8299); //er,!ebb,ET,ES,EX,!eb,!ew,DC
@@ -230,7 +274,7 @@
     static queue<unsigned char> temp;
 
     //Loop while interrupt is asserted
-    while (!NIRQ_in) {
+    while (!NIRQ_in && mode == RX) {
 
         /* Grab the packet's length byte */
         if (i == -2) {

diff -r 048b717be6c0 -r 09e016eea608 RF12B.h
--- a/RF12B.h	Fri Mar 11 18:02:05 2011 +0000
+++ b/RF12B.h	Wed Feb 08 16:51:49 2012 +0000
@@ -4,8 +4,6 @@
 #include "mbed.h"
 #include <queue>
 
-#define PACKET_LEN 16
-
 enum rfmode_t{RX, TX};
 
 class RF12B {
@@ -28,9 +26,8 @@
 
     /* Transmits a packet of data */
     void write(unsigned char* data, unsigned char length);
-    
-    /* Transmits a 1-byte packet of data */
-    void write(unsigned char data);
+    void write(unsigned char data); /* 1-byte packet */
+    void write(queue<char> &data, int length = -1); /* sends a whole queue */
     
     /* Returns the packet length if data is available in the receive buffer, 0 otherwise*/
     unsigned int available();
@@ -47,6 +44,8 @@
     InterruptIn NIRQ;
     DigitalIn NIRQ_in;
     DigitalOut rfled;
+    
+    rfmode_t mode;
 
     /* Initialises the RF12B module */
     void init();