Revision 4:b3a70cbb7c81, committed 2016-06-06

Comitter:

janhavi

Date:

Mon Jun 06 10:57:33 2016 +0000

Parent:

3:208abcd4751d

Child:

5:c44298b018f4

Commit message:

Single Receiver for multiple sensors connected to different transmitters. Uses NRF logical pipes for communication over same RF channel.

Changed in this revision

--- a/Receiver.cpp	Tue May 24 10:08:51 2016 +0000
+++ b/Receiver.cpp	Mon Jun 06 10:57:33 2016 +0000
@@ -1,55 +1,81 @@
+/*****Multiceiver wireless network*****/
+
 #include "mbed.h"
 #include "nRF24L01P.h"
  
 Serial pc(USBTX, USBRX); // tx, rx
  
 nRF24L01P my_nrf24l01p(PTD2, PTD3, PTD1, PTD0, PTD5, PTD4);    // mosi, miso, sck, csn, ce, irq
-DigitalOut GreenLED(LED2);
-PwmOut RedLed(LED1);
+
+//blue for pipe1 and green for pipe0
+DigitalOut GreenLED(PTA12);
+DigitalOut BlueLED(PTC8);
  
 int main() {
     
-    char count[2];
-    char RxDataCnt;
+    char count[1];
+    char RxDataCnt_PIPE0, RxDataCnt_PIPE1;
     char temp;
     
-    float ldr_val, pot_val;
- 
+    //specifying address same as transmitter for pipe0 and pipe1
+    long long RxAddress_PIPE1 = 0xE2E2E2E2E2;
+    long long RxAddress_PIPE0 = 0xC2C2C2C2C2;
+    
     my_nrf24l01p.powerUp();
     my_nrf24l01p.setRfFrequency(2410);
+    
+    //set rx address with default address and for specified pipe
+    my_nrf24l01p.setRxAddress(RxAddress_PIPE1, DEFAULT_NRF24L01P_ADDRESS_WIDTH, NRF24L01P_PIPE_P1);
+    my_nrf24l01p.setRxAddress(RxAddress_PIPE0, DEFAULT_NRF24L01P_ADDRESS_WIDTH, NRF24L01P_PIPE_P0);
+    
  
     // Display the (default) setup of the nRF24L01+ chip
     pc.printf( "nRF24L01+ Frequency    : %d MHz\r\n",  my_nrf24l01p.getRfFrequency() );
     pc.printf( "nRF24L01+ Output power : %d dBm\r\n",  my_nrf24l01p.getRfOutputPower() );
     pc.printf( "nRF24L01+ Data Rate    : %d kbps\r\n", my_nrf24l01p.getAirDataRate() );
-    pc.printf( "nRF24L01+ TX Address   : 0x%010llX\r\n", my_nrf24l01p.getTxAddress() );
-    pc.printf( "nRF24L01+ RX Address   : 0x%010llX\r\n", my_nrf24l01p.getRxAddress() );
+    
+    //display rx address for both pipes
+    pc.printf( "nRF24L01+ RX Address - PIPE0  : 0x%010llX\r\n", my_nrf24l01p.getRxAddress(NRF24L01P_PIPE_P0) );
+    pc.printf( "nRF24L01+ RX Address - PIPE1  : 0x%010llX\r\n", my_nrf24l01p.getRxAddress(NRF24L01P_PIPE_P1) );
  
-    pc.printf( "Simple 2 Byte Receiver\r\n" );
+    pc.printf( "Wireless Sensor Network - Multiceiver\r\n" );
     
-    RxDataCnt = 2;
-    my_nrf24l01p.setTransferSize( RxDataCnt );
+    RxDataCnt_PIPE0 = 1;
+    RxDataCnt_PIPE1 = 1;
+    
+    //set transfer size explicitly for both pipes
+    my_nrf24l01p.setTransferSize(RxDataCnt_PIPE1, NRF24L01P_PIPE_P1);
+    my_nrf24l01p.setTransferSize(RxDataCnt_PIPE0, NRF24L01P_PIPE_P0);
     
     my_nrf24l01p.setReceiveMode();
     my_nrf24l01p.enable();
  
     while (1) {
- 
-        // If we've received anything in the nRF24L01+...
-        if ( my_nrf24l01p.readable() ) {
+        
+        //check if data is available in pipe0
+        if ( my_nrf24l01p.readable(NRF24L01P_PIPE_P0) ) {
  
             // ...read the data into the receive buffer
-            temp = my_nrf24l01p.read( NRF24L01P_PIPE_P0, count, RxDataCnt );
+            temp = my_nrf24l01p.read( NRF24L01P_PIPE_P0, count, RxDataCnt_PIPE0 );
  
-            ldr_val = count[0]/255.0;
-            pot_val = count[1]/255.0;
-            
-            //change according to need here; Im printing on serial terminal
-            pc.printf("Received: %d bytes ;LDR=%.3f, POT=%.3f\r\n",temp,ldr_val, pot_val);
+            pc.printf("Received: %d bytes from PIPE0; POT=%d\r\n",temp, count[0]);
             
             // Toggle LED2 (to help debug nRF24L01+ -> Host communication)
             GreenLED = !GreenLED;
             wait_ms(10);
         }
+        
+        //check if data is there in pipe1
+        if ( my_nrf24l01p.readable(NRF24L01P_PIPE_P1) ) {
+ 
+            // ...read the data into the receive buffer
+            temp = my_nrf24l01p.read( NRF24L01P_PIPE_P1, count, RxDataCnt_PIPE1 );
+ 
+            pc.printf("Received: %d bytes from PIPE1; POT=%d\r\n",temp, count[0]);
+            
+            // Toggle LED2 (to help debug nRF24L01+ -> Host communication)
+            BlueLED = !BlueLED;
+            wait_ms(10);
+        }
     }
 }
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