Revision 2:d77298c11128, committed 2017-04-13

Comitter:

simplyellow

Date:

Thu Apr 13 17:31:57 2017 +0000

Parent:

1:5be2682710c6

Child:

3:bb1102948ba5

Commit message:

base station

Changed in this revision

--- a/main.cpp	Wed Jan 19 23:53:19 2011 +0000
+++ b/main.cpp	Thu Apr 13 17:31:57 2017 +0000
@@ -1,75 +1,101 @@
 #include "mbed.h"
 #include "nRF24L01P.h"
 
-Serial pc(USBTX, USBRX); // tx, rx
+#define TRANSFER_SIZE   8
 
+Serial pc(USBTX, USBRX); // tx, rx
 nRF24L01P my_nrf24l01p(p5, p6, p7, p8, p9, p10);    // mosi, miso, sck, csn, ce, irq
-
 DigitalOut myled1(LED1);
 DigitalOut myled2(LED2);
 
-int main() {
+char txData[TRANSFER_SIZE], rxData[TRANSFER_SIZE], acked[TRANSFER_SIZE], 
+    nacked[TRANSFER_SIZE];
+bool ack = false;
+int txDataCnt = 0;
+int rxDataCnt = 0;
+int matched = 0;
 
-// The nRF24L01+ supports transfers from 1 to 32 bytes, but Sparkfun's
-//  "Nordic Serial Interface Board" (http://www.sparkfun.com/products/9019)
-//  only handles 4 byte transfers in the ATMega code.
-#define TRANSFER_SIZE   4
+void send() {
+    //SEND
+    // If we've received anything over the host serial link...
+    if (pc.readable()) {
+        // ...add it to the transmit buffer
+        txData[txDataCnt++] = pc.getc();
+        // If the transmit buffer is full
+        if (txDataCnt >= sizeof(txData)) {
+            // Send the transmitbuffer via the nRF24L01+
+            my_nrf24l01p.write(NRF24L01P_PIPE_P0, txData, txDataCnt);
+            txDataCnt = 0;
+            pc.printf("Sent command\n\r");
+            
+            //wait for valid confirmation
+            checkValid();
+        }
+        // Toggle LED1 (to help debug Host -> nRF24L01+ communication)
+        myled1 = !myled1;
+    }
+}
 
-    char txData[TRANSFER_SIZE], rxData[TRANSFER_SIZE];
-    int txDataCnt = 0;
-    int rxDataCnt = 0;
+void checkValid() {
+    waitForAck();   //other code has SWITCH statement
+    if(ack) {//if valid, wait til next ack
+        pc.printf("valid, please wait to send again\n\r");
+        ack = false;
+        while(!ack) {
+            waitForAck();
+        }
+        pc.printf("ready to send again\r\n");
+        send();
+    } else {//if invalid
+        pc.printf("invalid, send another\n\r");
+        send();
+    }   
+}
 
+void waitForAck() {
+    //RECEIVE ACK
+    if (my_nrf24l01p.readable()) {
+        // ...read the data into the receive buffer
+        rxDataCnt = my_nrf24l01p.read( NRF24L01P_PIPE_P0, rxData, sizeof(rxData ));
+        // match with ack array
+        for ( int i = 0; rxDataCnt > 0; rxDataCnt--, i++ ) {
+            if(rxData[i] == acked[i]) {
+                matched++;
+            }
+        }
+        if(matched == TRANSFER_SIZE) {
+            pc.printf("ACK\n\r");
+            ack = true;
+        } else {
+            pc.printf("NACK\n\r");
+        }
+        // Toggle LED2 (to help debug nRF24L01+ -> Host communication)
+        myled2 = !myled2;
+    }
+}
+
+int main() {
+    //initialize the arrays recognized as ACK and NACK
+    for(int i = 0; i < TRANSFER_SIZE; i++) {
+        acked[i] = '0';
+        nacked[i] = '1';
+    }
     my_nrf24l01p.powerUp();
-
     // 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() );
-
-    pc.printf( "Type keys to test transfers:\r\n  (transfers are grouped into %d characters)\r\n", TRANSFER_SIZE );
-
     my_nrf24l01p.setTransferSize( TRANSFER_SIZE );
-
     my_nrf24l01p.setReceiveMode();
     my_nrf24l01p.enable();
 
     while (1) {
-
-        // If we've received anything over the host serial link...
-        if ( pc.readable() ) {
-
-            // ...add it to the transmit buffer
-            txData[txDataCnt++] = pc.getc();
-
-            // If the transmit buffer is full
-            if ( txDataCnt >= sizeof( txData ) ) {
-
-                // Send the transmitbuffer via the nRF24L01+
-                my_nrf24l01p.write( NRF24L01P_PIPE_P0, txData, txDataCnt );
-
-                txDataCnt = 0;
-            }
-
-            // Toggle LED1 (to help debug Host -> nRF24L01+ communication)
-            myled1 = !myled1;
-        }
-
-        // If we've received anything in the nRF24L01+...
-        if ( my_nrf24l01p.readable() ) {
-
-            // ...read the data into the receive buffer
-            rxDataCnt = my_nrf24l01p.read( NRF24L01P_PIPE_P0, rxData, sizeof( rxData ) );
-
-            // Display the receive buffer contents via the host serial link
-            for ( int i = 0; rxDataCnt > 0; rxDataCnt--, i++ ) {
-
-                pc.putc( rxData[i] );
-            }
-
-            // Toggle LED2 (to help debug nRF24L01+ -> Host communication)
-            myled2 = !myled2;
-        }
+        if(!ack) {
+            waitForAck();
+        } else {
+            send();
+        }  
     }
 }