Further tweaks per #9

- moved radio.flush_tx(); to public
- adjusted call_response example to use tx_flush();
- adjusted write_payload, read_payload

RPi/RF24/RF24.cpp

@@ -129,7 +129,8 @@ uint8_t RF24::write_payload(const void* buf, uint8_t len, const uint8_t writeTyp
   while ( blank_len-- )
 		*ptx++ =  0;
 
-	bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
+
+	bcm2835_spi_transfernbd( (char *) spi_txbuff, (char *) spi_rxbuff, size);
 
 	status = *prx; // status is 1st byte of receive buffer
 
@@ -163,8 +164,11 @@ uint8_t RF24::read_payload(void* buf, uint8_t len)
 	// Size has been lost during while, re affect
 	size = data_len + blank_len + 1; // Add register value to transmit buffer
 
+	if(dynamic_payloads_enabled){
+		bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
+	}else{
 		bcm2835_spi_transfernbd( (char *) spi_txbuff, (char *) spi_rxbuff, size);
-
+	}
 	// 1st byte is status
 	status = *prx++;
 

RPi/RF24/RF24.h

@@ -144,13 +144,6 @@ protected:
    */
   uint8_t flush_rx(void);
 
-  /**
-   * Empty the transmit buffer
-   *
-   * @return Current value of status register
-   */
-  uint8_t flush_tx(void);
-
   /**
    * Retrieve the current status of the chip
    *
@@ -346,6 +339,13 @@ public:
 
   void openReadingPipe(uint8_t number, const uint8_t *address);
 
+  /**
+   * Empty the transmit buffer
+   *
+   * @return Current value of status register
+   */
+  uint8_t flush_tx(void);
+
   /**@}*/
   /**
    * @name Optional Configurators

RPi/RF24/examples/gettingstarted_call_response.cpp

@@ -116,6 +116,7 @@ while (1){
     }else{        printf("Sending failed.\n\r"); }          // If no ack response, sending failed
 
     sleep(1);  // Try again later
+    //delay(250);
   }
 
 /****************** Pong Back Role ***************************/
@@ -123,11 +124,14 @@ while (1){
   if ( role == role_pong_back ) {
     uint8_t pipeNo, gotByte;                       // Declare variables for the pipe and the byte received
     while( radio.available(&pipeNo)){              // Read all available payloads
+      radio.flush_tx();				   // Clear any unused ACK payloads
       radio.read( &gotByte, 1 );
                                                    // Since this is a call-response. Respond directly with an ack payload.
       						   // Ack payloads are much more efficient than switching to transmit mode to respond to a call
       radio.writeAckPayload(pipeNo,&gotByte, 1 );  // This can be commented out to send empty payloads.
+      
       printf("Sent response %d \n\r", gotByte);
+      
    }
  }