Diff: WhackAMole.cpp

Revision:

0:ddc820578cb0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WhackAMole.cpp	Wed Mar 20 19:05:36 2013 +0000
@@ -0,0 +1,113 @@
+#include "mbed.h"
+#include "MRF24J40.h"
+
+#include <string>
+
+// RF tranceiver to link with handheld.
+MRF24J40 mrf(p11, p12, p13, p14, p21);
+
+// LEDs you can treat these as variables (led2 = 1 will turn led2 on!)
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+// Timer
+Timer timer;
+
+// Serial port for showing RX data.
+Serial pc(USBTX, USBRX);
+
+// Used for sending and receiving
+char txBuffer[128];
+char rxBuffer[128];
+int rxLen;
+
+//***************** Do not change these methods (please) *****************//
+
+/**
+* Receive data from the MRF24J40.
+*
+* @param data A pointer to a char array to hold the data
+* @param maxLength The max amount of data to read.
+*/
+int rf_receive(char *data, uint8_t maxLength)
+{
+    uint8_t len = mrf.Receive((uint8_t *)data, maxLength);
+    uint8_t header[8]= {1, 8, 0, 0xA1, 0xB2, 0xC3, 0xD4, 0x00};
+
+    if(len > 10) {
+        //Remove the header and footer of the message
+        for(uint8_t i = 0; i < len-2; i++) {
+            if(i<8) {
+                //Make sure our header is valid first
+                if(data[i] != header[i])
+                    return 0;
+            } else {
+                data[i-8] = data[i];
+            }
+        }
+
+        //pc.printf("Received: %s length:%d\r\n", data, ((int)len)-10);
+    }
+    return ((int)len)-10;
+}
+
+/**
+* Send data to another MRF24J40.
+*
+* @param data The string to send
+* @param maxLength The length of the data to send.
+*                  If you are sending a null-terminated string you can pass strlen(data)+1
+*/
+void rf_send(char *data, uint8_t len)
+{
+    //We need to prepend the message with a valid ZigBee header
+    uint8_t header[8]= {1, 8, 0, 0xA1, 0xB2, 0xC3, 0xD4, 0x00};
+    uint8_t *send_buf = (uint8_t *) malloc( sizeof(uint8_t) * (len+8) );
+
+    for(uint8_t i = 0; i < len+8; i++) {
+        //prepend the 8-byte header
+        send_buf[i] = (i<8) ? header[i] : data[i-8];
+    }
+    //pc.printf("Sent: %s\r\n", send_buf+8);
+
+    mrf.Send(send_buf, len+8);
+    free(send_buf);
+}
+
+
+//***************** You can start coding here *****************//
+int main (void)
+{
+    uint8_t channel = 2;
+
+    //Set the Channel. 0 is default, 15 is max
+    mrf.SetChannel(channel);
+
+    //Start the timer
+    timer.start();
+
+    while(true) {
+        //Try to receive some data
+        rxLen = rf_receive(rxBuffer, 128);
+        if(rxLen > 0) {
+            //Toggle the Led
+            led1 = led1^1;
+            pc.printf("Received: %s\r\n", rxBuffer);
+        }
+        
+        //Send some data every second
+        if(timer.read_ms() >= 1000) {
+            //Reset the timer to 0
+            timer.reset();
+            // Toggle LED 2.
+            led2 = led2^1;
+            //Add to the buffer. You may want to check out sprintf
+            strcpy(txBuffer, "Jeff is the best TA!");
+            //Send the buffer
+            rf_send(txBuffer, strlen(txBuffer) + 1);
+            pc.printf("Sent: %s\r\n", txBuffer);
+        }
+    }
+}