enableDynamicAck(), Single NOACK, default RT,

- Added new function: enableDynamicAck()  to enable single-write NOACK
payloads (merge closer with gcopeland fork)
- Added single NOACK writes for write(), writeFast(), startWrite() and
startFastWrite()
- powerUp() now checks to see if radio is powered on. No delay if
powered up.
- radio must still be powered up manually if powered down manually
- use setRetries function in begin()
- set CE low on powerDown
- updated readme

README.md

@@ -2,19 +2,22 @@
   
 Design Goals: This library is designed to be...  
   
-* More compliant with the manufacturer specified operation of the chip  
+* More compliant with the manufacturer specified operation of the chip, while allowing advanced users
+* to work outside the reccommended operation. 
+* Utilize the capabilities of the radio to their full potential via Arduino
 * More reliable and feature rich  
-* Easy for beginners to use  
+* Easy for beginners to use, with well documented examples and features 
 * Consumed with a public interface that's similiar to other Arduino standard libraries  
 * Built against the standard SPI library.   
   
-March 2014: Optimization begun  
-April 2014: Optimization nearing completion    
+April 2014: Official Release: Still some work to do, but most benefits have been realized
+
 * The library has been tweaked to allow full use of the FIFO buffers for maximum transfer speeds
-* Changes to read() functionality have increased reliability and response  
+* Changes to read() and available () functionality have increased reliability and response
 * Extended timeout periods have been added to aid in noisy or otherwise unreliable environments
 * Delays have been removed where possible to ensure maximum efficiency
-* Arduino Due fully supported with extended SPI functions
+* Full Due support with extended SPI functions
+* ATTiny 24/44/84 25/45/85 now supported.
 * More! See the links below and class documentation for more info.
   
 Please refer to:  
@@ -28,3 +31,10 @@ Please refer to:
 This chip uses the SPI bus, plus two chip control pins.  Remember that pin 10 must still remain an output, or  
 the SPI hardware will go into 'slave' mode.  
   
+Supported Boards:  
+  
+* Uno, Nano, etc (328 based boards)  
+* Mega Types (2560, 1280, etc)  
+* ARM (Arduino Due) via extended SPI methods 
+* ATTiny 24/44/84 25/45/85  
+* See the [documentation](http://tmrh20.github.io/) for more info
\ No newline at end of file

RF24.cpp

@@ -135,7 +135,7 @@ uint8_t RF24::write_register(uint8_t reg, uint8_t value)
 
 /****************************************************************************/
 
-uint8_t RF24::write_payload(const void* buf, uint8_t data_len)
+uint8_t RF24::write_payload(const void* buf, uint8_t data_len, const uint8_t writeType)
 {
   uint8_t status;
   const uint8_t* current = reinterpret_cast<const uint8_t*>(buf);
@@ -147,7 +147,7 @@ uint8_t RF24::write_payload(const void* buf, uint8_t data_len)
 
  #if defined (__arm__)
 
-  status = SPI.transfer(csn_pin, W_TX_PAYLOAD , SPI_CONTINUE);
+  status = SPI.transfer(csn_pin, writeType , SPI_CONTINUE);
 
   if(blank_len){
     while ( data_len--){
@@ -167,7 +167,7 @@ uint8_t RF24::write_payload(const void* buf, uint8_t data_len)
   #else
 
   csn(LOW);
-  status = SPI.transfer( W_TX_PAYLOAD );
+  status = SPI.transfer( writeType );
   while ( data_len-- ) {
     SPI.transfer(*current++);
   }
@@ -346,7 +346,7 @@ void RF24::print_address_register(const char* name, uint8_t reg, uint8_t qty)
 /****************************************************************************/
 
 RF24::RF24(uint8_t _cepin, uint8_t _cspin):
-  ce_pin(_cepin), csn_pin(_cspin), wide_band(true), p_variant(false),
+  ce_pin(_cepin), csn_pin(_cspin), wide_band(false), p_variant(false),
   payload_size(32), ack_payload_available(false), dynamic_payloads_enabled(false),
   pipe0_reading_address(0)
 {
@@ -466,8 +466,6 @@ void RF24::begin(void)
   	csn(HIGH);
   #endif
 
-
-
   // Must allow the radio time to settle else configuration bits will not necessarily stick.
   // This is actually only required following power up but some settling time also appears to
   // be required after resets too. For full coverage, we'll always assume the worst.
@@ -479,7 +477,7 @@ void RF24::begin(void)
   // Set 1500uS (minimum for 32B payload in ESB@250KBPS) timeouts, to make testing a little easier
   // WARNING: If this is ever lowered, either 250KBS mode with AA is broken or maximum packet
   // sizes must never be used. See documentation for a more complete explanation.
-  write_register(SETUP_RETR,(B0100 << ARD) | (B1111 << ARC));
+  setRetries(5,15);
 
   // Restore our default PA level
   setPALevel( RF24_PA_MAX ) ;
@@ -516,9 +514,10 @@ void RF24::begin(void)
   flush_rx();
   flush_tx();
 
-  powerUp();
-  delay(5);
-  //Enable PTX, do not write CE high so radio will remain in standby I mode ( 130us max to transition to RX or TX instead of 1500us from powerUp )
+  powerUp(); //Power up by default when begin() is called
+
+  // Enable PTX, do not write CE high so radio will remain in standby I mode ( 130us max to transition to RX or TX instead of 1500us from powerUp )
+  // PTX should use only 22uA of power
   write_register(CONFIG, ( read_register(CONFIG) ) & ~_BV(PRIM_RX) );
 
 
@@ -528,7 +527,8 @@ void RF24::begin(void)
 
 void RF24::startListening(void)
 {
-  write_register(CONFIG, read_register(CONFIG) | _BV(PWR_UP) | _BV(PRIM_RX));
+  powerUp();
+  write_register(CONFIG, read_register(CONFIG) | _BV(PRIM_RX));
   write_register(STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT) );
 
   // Restore the pipe0 adddress, if exists
@@ -559,6 +559,7 @@ void RF24::stopListening(void)
 
 void RF24::powerDown(void)
 {
+  ce(LOW); // Guarantee CE is low on powerDown
   write_register(CONFIG,read_register(CONFIG) & ~_BV(PWR_UP));
 }
 
@@ -567,17 +568,23 @@ void RF24::powerDown(void)
 //Power up now. Radio will not power down unless instructed by MCU for config changes etc.
 void RF24::powerUp(void)
 {
+   uint8_t cfg = read_register(CONFIG);
+
+   // if not powered up then power up and wait for the radio to initialize
+   if (!(cfg & _BV(PWR_UP))){
       write_register(CONFIG,read_register(CONFIG) | _BV(PWR_UP));
-  delay(5);
+      delayMicroseconds(1500);
+
+   }
 }
 
 /******************************************************************/
 
 //Similar to the previous write, clears the interrupt flags
-bool RF24::write( const void* buf, uint8_t len )
+bool RF24::write( const void* buf, uint8_t len, const bool multicast )
 {
 	//Start Writing
-    startWrite(buf,len);
+    startWrite(buf,len,multicast);
 
 	//Wait until complete or failed
 	//ACK payloads that are handled improperly will cause this to hang
@@ -595,6 +602,9 @@ bool RF24::write( const void* buf, uint8_t len )
   return 1;
 }
 
+bool RF24::write( const void* buf, uint8_t len ){
+	write(buf,len,0);
+}
 /****************************************************************************/
 
 //For general use, the interrupt flags are not important to clear
@@ -617,7 +627,7 @@ bool RF24::writeBlocking( const void* buf, uint8_t len, uint32_t timeout )
   	}
 
   	//Start Writing
-	startFastWrite(buf,len);								  //Write the payload if a buffer is clear
+	startFastWrite(buf,len,0);								  //Write the payload if a buffer is clear
 
 	return 1;												  //Return 1 to indicate successful transmission
 }
@@ -638,7 +648,7 @@ void RF24::reUseTX(){
 
 /****************************************************************************/
 
-bool RF24::writeFast( const void* buf, uint8_t len )
+bool RF24::writeFast( const void* buf, uint8_t len, const bool multicast )
 {
 	//Block until the FIFO is NOT full.
 	//Keep track of the MAX retries and set auto-retry if seeing failures
@@ -656,12 +666,14 @@ bool RF24::writeFast( const void* buf, uint8_t len )
 
   	}
 		     //Start Writing
-	startFastWrite(buf,len);
+	startFastWrite(buf,len,multicast);
 
 	return 1;
 }
 
-
+bool RF24::writeFast( const void* buf, uint8_t len ){
+	writeFast(buf,len,0);
+}
 
 /****************************************************************************/
 
@@ -670,9 +682,10 @@ bool RF24::writeFast( const void* buf, uint8_t len )
 //Otherwise we enter Standby-II mode, which is still faster than standby mode
 //Also, we remove the need to keep writing the config register over and over and delaying for 150 us each time if sending a stream of data
 
-void RF24::startFastWrite( const void* buf, uint8_t len ){ //TMRh20
+void RF24::startFastWrite( const void* buf, uint8_t len, const bool multicast){ //TMRh20
 
-	write_payload( buf,len);
+	//write_payload( buf,len);
+	write_payload( buf, len,multicast?static_cast<uint8_t>(W_TX_PAYLOAD_NO_ACK):static_cast<uint8_t>(W_TX_PAYLOAD) ) ;
 	ce(HIGH);
 
 }
@@ -680,11 +693,12 @@ void RF24::startFastWrite( const void* buf, uint8_t len ){ //TMRh20
 
 //Added the original startWrite back in so users can still use interrupts, ack payloads, etc
 //Allows the library to pass all tests
-void RF24::startWrite( const void* buf, uint8_t len ){
+void RF24::startWrite( const void* buf, uint8_t len, const bool multicast ){
 
   // Send the payload
 
-  write_payload( buf, len );
+  //write_payload( buf, len );
+  write_payload( buf, len,multicast?static_cast<uint8_t>(W_TX_PAYLOAD_NO_ACK):static_cast<uint8_t>(W_TX_PAYLOAD) ) ;
   ce(HIGH);
   ce(LOW);
 
@@ -933,6 +947,27 @@ void RF24::enableAckPayload(void)
 
 /****************************************************************************/
 
+void RF24::enableDynamicAck(void){
+  //
+  // enable dynamic ack features
+  //
+
+  write_register(FEATURE,read_register(FEATURE) | _BV(EN_DYN_ACK) );
+
+  // If it didn't work, the features are not enabled
+  if ( ! read_register(FEATURE) & _BV(EN_DYN_ACK) ){
+    // So enable them and try again
+    toggle_features();
+    write_register(FEATURE,read_register(FEATURE) | _BV(EN_DYN_ACK) );
+  }
+
+  IF_SERIAL_DEBUG(printf("FEATURE=%i\r\n",read_register(FEATURE)));
+
+
+}
+
+/****************************************************************************/
+
 void RF24::writeAckPayload(uint8_t pipe, const void* buf, uint8_t len)
 {
   const uint8_t* current = reinterpret_cast<const uint8_t*>(buf);

RF24.h

@@ -256,6 +256,22 @@ public:
    */
   void powerUp(void) ;
 
+  /**
+  * Write for single NOACK writes. Disables acknowledgements/autoretries for a single write.
+  *
+  * @note enableDynamicAck() must be called to enable this feature
+  *
+  * Can be used with enableAckPayload() to request a response
+  * @see enableDynamicAck()
+  * @see setAutoAck()
+  * @see write()
+  *
+  * @param buf Pointer to the data to be sent
+  * @param len Number of bytes to be sent
+  * @param multicast Request ACK (0), NOACK (1)
+  */
+  bool write( const void* buf, uint8_t len, const bool multicast );
+
   /**
    * @note Optimization: New Command   *
    * This will not block until the 3 FIFO buffers are filled with data.
@@ -289,6 +305,19 @@ public:
    */
   bool writeFast( const void* buf, uint8_t len );
 
+  /**
+  * WriteFast for single NOACK writes. Disables acknowledgements/autoretries for a single write.
+  *
+  * @note enableDynamicAck() must be called to enable this feature
+  * @see enableDynamicAck()
+  * @see setAutoAck()
+  *
+  * @param buf Pointer to the data to be sent
+  * @param len Number of bytes to be sent
+  * @param multicast Request ACK (0) or NOACK (1)
+  */
+  bool writeFast( const void* buf, uint8_t len, const bool multicast );
+
   /**
    * @note Optimization: New Command
    * This function extends the auto-retry mechanism to any specified duration.
@@ -383,6 +412,20 @@ public:
    */
   void writeAckPayload(uint8_t pipe, const void* buf, uint8_t len);
 
+  /**
+   * Enable dynamic ACKs (single write multicasting) for chosen messages
+   *
+   * @note To enable full multicasting or per-pipe multicast, use setAutoAck()
+   *
+   * @warning This MUST be called prior to attempting single write NOACK calls
+   * @code
+   * radio.enableDynamicAck();
+   * radio.write(&data,32,1);  // Sends a payload with no acknowledgement requested
+   * radio.write(&data,32,0);  // Sends a payload using auto-retry/autoACK
+   * @endcode
+   */
+  void enableDynamicAck();
+
   /**
    * Determine if an ack payload was received in the most recent call to
    * write().
@@ -424,11 +467,16 @@ public:
    * @see startWrite()
    * @see writeBlocking()
    *
+   * For single noAck writes see:
+   * @see enableDynamicAck()
+   * @see setAutoAck()
+   *
    * @param buf Pointer to the data to be sent
    * @param len Number of bytes to be sent
+   * @param multicast Request ACK (0) or NOACK (1)
    * @return True if the payload was delivered successfully false if not
    */
-  void startFastWrite( const void* buf, uint8_t len );
+  void startFastWrite( const void* buf, uint8_t len, const bool multicast );
 
   /**
    * Non-blocking write to the open writing pipe
@@ -445,11 +493,16 @@ public:
    * @see startFastWrite()
    * @see whatHappened()
    *
+   * For single noAck writes see:
+   * @see enableDynamicAck()
+   * @see setAutoAck()
+   *
    * @param buf Pointer to the data to be sent
    * @param len Number of bytes to be sent
+   * @param multicast Request ACK (0) or NOACK (1)
    *
    */
-  void startWrite( const void* buf, uint8_t len );
+  void startWrite( const void* buf, uint8_t len, const bool multicast );
 
   /**
    * Optimization: New Command
@@ -776,7 +829,7 @@ private:
    * @param len Number of bytes to be sent
    * @return Current value of status register
    */
-  uint8_t write_payload(const void* buf, uint8_t len);
+  uint8_t write_payload(const void* buf, uint8_t len, const uint8_t writeType);
 
   /**
    * Read the receive payload
@@ -1003,18 +1056,18 @@ private:
  * @section Goals Design Goals
  *
  * This library fork is designed to be...
- * @li More compliant with the manufacturer specified operation of the chip
+ * @li More compliant with the manufacturer specified operation of the chip, while allowing advanced users
+ * to work outside the reccommended operation.
  * @li Utilize the capabilities of the radio to their full potential via Arduino
  * @li More reliable, responsive and feature rich
- * @li Easy for beginners to use
+ * @li Easy for beginners to use, with well documented examples and features
  * @li Consumed with a public interface that's similiar to other Arduino standard libraries
  *
  * @section News News
  *
- * <b>March 2014: Optimization begun<br>
- * April 2014: Optimization nearing completion </b><br>
+ * <b>April 2014: Official Release: Still some work to do, but most benefits have been realized </b><br>
  * - The library has been tweaked to allow full use of the FIFO buffers for maximum transfer speeds
- * - Changes to read() functionality have increased reliability and response
+ * - Changes to read() and available () functionality have increased reliability and response
  * - Extended timeout periods have been added to aid in noisy or otherwise unreliable environments
  * - Delays have been removed where possible to ensure maximum efficiency
  * - Full Due support with extended SPI functions

nRF24L01.h

 /*
     Copyright (c) 2007 Stefan Engelke <mbox@stefanengelke.de>
+	Portions Copyright (C) 2011 Greg Copeland
 
     Permission is hereby granted, free of charge, to any person
     obtaining a copy of this software and associated documentation
@@ -117,6 +118,7 @@
 
 /* P model memory Map */
 #define RPD         0x09
+#define W_TX_PAYLOAD_NO_ACK  0xB0
 
 /* P model bit Mnemonics */
 #define RF_DR_LOW   5