Diff: alpha433.cpp

Revision:

8:08dec9c7d3f6

Parent:

4:52b3e4c5a425

--- a/alpha433.cpp	Sun Feb 02 22:49:19 2014 +0000
+++ b/alpha433.cpp	Mon Feb 03 12:59:51 2014 +0000
@@ -1,6 +1,6 @@
 /*******************************************************************************************
  *
- * University of York Robot Lab Pi Swarm Library: 433MHz Alpha Transceiver
+ * University of York Robot Lab Pi Swarm Library: 433MHz Alpha Transceiver Driver
  *
  * (C) Dr James Hilder, Dept. Electronics & Computer Science, University of York
  *
@@ -15,10 +15,8 @@
 
 // Variables
 
-DigitalOut rf_led(LED1);
 Timeout reset_timeout;
 
-
 char cRFStatus = 0;
 
 signed short ssTransmitCount = 0;
@@ -41,45 +39,39 @@
 
 }
 
-
-
-
-// RF Send Data
-//
-//  Eg:
-//  unsigned char message[32];
-//  unsigned char count;
-//  count = snprintf(message, 32, "Hello: %i", 42);
-//  sendString(count, message);
+// Send data on the Alpha 433 transceiver, cCount = string length, cBuffer = data string
 unsigned long Alpha433::sendString(char cCount, char* cBuffer)
 {
-    // pc.printf("SendString called");
     unsigned char i = 0;
-    if(cRFStatus == ALPHA433_MODE_TRANSMITTING) {// RF already transmitting
+    if(cRFStatus == ALPHA433_MODE_TRANSMITTING) {
+        // RF already transmitting
         if(RF_VERBOSE == 1)pc.printf("RF Error: Already transmitting\n");
         return 1; // Error
 
     }
 
-    if(cCount > 62) {// Amount of data to high
+    if(cCount > 62) {
+        // Amount of data to high
         if(RF_VERBOSE == 1)pc.printf("RF Error: Too much tx data\n");
         return 2; // Error
 
     }
-    if(cCount == 0) {// No Data
+    if(cCount == 0) {
+        // No Data
         if(RF_VERBOSE == 1)pc.printf("RF Error: No tx data\n");
         return 3; // Error
     }
     cTXBuffer[i] = cCount;
-
     unsigned char checksum_byte = 0;
-    for(i=0; i<cCount; i++)   {// make a copy
+    for(i=0; i<cCount; i++)   {
+        // make a copy
         cTXBuffer[i+1] = cBuffer[i];
         checksum_byte ^= cBuffer[i];
     }
     cTXBuffer[cCount+1] = checksum_byte;
     if(RF_VERBOSE == 1)pc.printf("RF Message: \"%s\" Checksum: %2X\n",cBuffer,checksum_byte);
-    ssTransmitCount = cCount+3; // add count and checksum
+    ssTransmitCount = cCount+3; 
+    // add count and checksum
     ssTransmitPointer = -6;
     cRFStatus = ALPHA433_MODE_SWITCHING;
     disableReceiver();
@@ -106,13 +98,36 @@
     return 0;
 }
 
+// Handle new RF Data
+void Alpha433::dataAvailable(char cCount, char* cBuffer)
+{
+    char rstring [cCount+1];
+    char checksum = 0;
+    int i;
+    for(i=0; i<cCount; i++) {
+        rstring[i]=cBuffer[i];
+        checksum ^= rstring[i];
+    }
+    rstring[cCount]=0;
+    if (cBuffer[cCount] != checksum) {
+        if(RF_VERBOSE == 1)pc.printf("RF Received [%d] \"%s\" (checksum failed: expected %02X, received %02X)%02X %02X\n",cCount,rstring,checksum,cBuffer[cCount],cBuffer[cCount-1],cBuffer[cCount+1]);
+    } else {
+        if(RF_VERBOSE == 1)pc.printf("RF Received [%d] \"%s\" (checksum passed)\n",cCount,rstring);
+        if(USE_COMMUNICATION_STACK == 1) {
+            processRadioData(rstring, cCount);
+        } else {
+            processRawRFData(rstring, cCount);
+        }
+    }
+}
+
+
 // Enable RF Transmitter
 void Alpha433::enableTransmitter(void)
 {
     if(RF_VERBOSE == 1)pc.printf("RF Enable TX\n");
     //RFCommand(0x8229);
     _write(0x8229);
-    rf_led = 1;
 }
 
 // Disable RF Transmitter
@@ -121,7 +136,6 @@
     if(RF_VERBOSE == 1)pc.printf("RF Disable TX\n");
     //RFCommand(0x8209);
     _write(0x8209);
-    rf_led = 0;
 }
 
 
@@ -131,7 +145,6 @@
     if(RF_VERBOSE == 1)pc.printf("RF Enable RX\n");
     //RFCommand(0x8288);
     _write(0x8288);
-    //rx_led = 1;
     enableFifoFill();
 }
 
@@ -168,6 +181,7 @@
 
 }
 
+// Timeout interrupt routine - reset chip
 void Alpha433::timeout(void)
 {
     if(RF_VERBOSE == 1)pc.printf("RF Error on read; resetting chip\n");
@@ -196,11 +210,10 @@
 }
 
 
-// RF Interrupt
+// RF Interrupt Called - handle received data
 void Alpha433::interrupt(void)
 {
     if(cRFStatus == ALPHA433_MODE_RECEIVING) {
-        rf_led=1;
         //Add reset timeout
         reset_timeout.detach();
         reset_timeout.attach(this,&Alpha433::timeout,0.5);
@@ -278,8 +291,6 @@
     _write(0xA000 | ulRateCmd);
 }
 
-
-
 // Enable RF Receiver FiFo fill
 void Alpha433::enableFifoFill(void)
 {
@@ -293,29 +304,6 @@
     _write(0xCA00 | ALPHA433_FIFO_LEVEL | ALPHA433_FIFO_FILL | ALPHA433_HI_SENS_RESET);
 }
 
-// Handle new RF Data
-void Alpha433::dataAvailable(char cCount, char* cBuffer)
-{
-    char rstring [cCount+1];
-    char checksum = 0;
-    int i;
-    for(i=0; i<cCount; i++) {
-        rstring[i]=cBuffer[i];
-        checksum ^= rstring[i];
-    }
-    rstring[cCount]=0;
-    if (cBuffer[cCount] != checksum) {
-        if(RF_VERBOSE == 1)pc.printf("RF Received [%d] \"%s\" (checksum failed: expected %02X, received %02X)%02X %02X\n",cCount,rstring,checksum,cBuffer[cCount],cBuffer[cCount-1],cBuffer[cCount+1]);
-    } else {
-        if(RF_VERBOSE == 1)pc.printf("RF Received [%d] \"%s\" (checksum passed)\n",cCount,rstring);
-        if(USE_COMMUNICATION_STACK == 1) {
-            processRadioData(rstring, cCount);
-        } else {
-            processRawRFData(rstring, cCount);
-        }
-    }
-}
-
 
 int Alpha433::readStatusByte()
 {