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RF24.h
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RF24.h
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/*
Copyright (C) 2011 J. Coliz <[email protected]>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
*/
/**
* @file RF24.h
*
* Class declaration for RF24 and helper enums
*/
#ifndef __RF24_H__
#define __RF24_H__
#include "RF24_config.h"
#if defined (RF24_LINUX) || defined (LITTLEWIRE)
#include "utility/includes.h"
#elif defined SOFTSPI
#include <DigitalIO.h>
#endif
/**
* Power Amplifier level.
*
* For use with setPALevel()
*/
typedef enum { RF24_PA_MIN = 0,RF24_PA_LOW, RF24_PA_HIGH, RF24_PA_MAX, RF24_PA_ERROR } rf24_pa_dbm_e ;
/**
* Data rate. How fast data moves through the air.
*
* For use with setDataRate()
*/
typedef enum { RF24_1MBPS = 0, RF24_2MBPS, RF24_250KBPS } rf24_datarate_e;
/**
* CRC Length. How big (if any) of a CRC is included.
*
* For use with setCRCLength()
*/
typedef enum { RF24_CRC_DISABLED = 0, RF24_CRC_8, RF24_CRC_16 } rf24_crclength_e;
/**
* Driver for nRF24L01(+) 2.4GHz Wireless Transceiver
*/
class RF24
{
private:
#ifdef SOFTSPI
SoftSPI<SOFT_SPI_MISO_PIN, SOFT_SPI_MOSI_PIN, SOFT_SPI_SCK_PIN, SPI_MODE> spi;
#elif defined (SPI_UART)
SPIUARTClass uspi;
#endif
#if defined (RF24_LINUX) || defined (XMEGA_D3) /* XMEGA can use SPI class */
SPI spi;
#endif
#if defined (MRAA)
GPIO gpio;
#endif
uint8_t ce_pin; /**< "Chip Enable" pin, activates the RX or TX role */
uint8_t csn_pin; /**< SPI Chip select */
uint16_t spi_speed; /**< SPI Bus Speed */
#if defined (RF24_LINUX) || defined (XMEGA_D3)
uint8_t spi_rxbuff[32+1] ; //SPI receive buffer (payload max 32 bytes)
uint8_t spi_txbuff[32+1] ; //SPI transmit buffer (payload max 32 bytes + 1 byte for the command)
#endif
bool p_variant; /* False for RF24L01 and true for RF24L01P */
uint8_t payload_size; /**< Fixed size of payloads */
bool dynamic_payloads_enabled; /**< Whether dynamic payloads are enabled. */
uint8_t pipe0_reading_address[5]; /**< Last address set on pipe 0 for reading. */
uint8_t addr_width; /**< The address width to use - 3,4 or 5 bytes. */
protected:
/**
* SPI transactions
*
* Common code for SPI transactions including CSN toggle
*
*/
inline void beginTransaction();
inline void endTransaction();
public:
/**
* @name Primary public interface
*
* These are the main methods you need to operate the chip
*/
/**@{*/
/**
* Arduino Constructor
*
* Creates a new instance of this driver. Before using, you create an instance
* and send in the unique pins that this chip is connected to.
*
* @param _cepin The pin attached to Chip Enable on the RF module
* @param _cspin The pin attached to Chip Select
*/
RF24(uint8_t _cepin, uint8_t _cspin);
//#if defined (RF24_LINUX)
/**
* Optional Linux Constructor
*
* Creates a new instance of this driver. Before using, you create an instance
* and send in the unique pins that this chip is connected to.
*
* @param _cepin The pin attached to Chip Enable on the RF module
* @param _cspin The pin attached to Chip Select
* @param spispeed For RPi, the SPI speed in MHZ ie: BCM2835_SPI_SPEED_8MHZ
*/
RF24(uint8_t _cepin, uint8_t _cspin, uint32_t spispeed );
//#endif
#if defined (RF24_LINUX)
virtual ~RF24() {};
#endif
/**
* Begin operation of the chip
*
* Call this in setup(), before calling any other methods.
* @code radio.begin() @endcode
*/
bool begin(void);
/**
* Start listening on the pipes opened for reading.
*
* 1. Be sure to call openReadingPipe() first.
* 2. Do not call write() while in this mode, without first calling stopListening().
* 3. Call available() to check for incoming traffic, and read() to get it.
*
* @code
* Open reading pipe 1 using address CCCECCCECC
*
* byte address[] = { 0xCC,0xCE,0xCC,0xCE,0xCC };
* radio.openReadingPipe(1,address);
* radio.startListening();
* @endcode
*/
void startListening(void);
/**
* Stop listening for incoming messages, and switch to transmit mode.
*
* Do this before calling write().
* @code
* radio.stopListening();
* radio.write(&data,sizeof(data));
* @endcode
*/
void stopListening(void);
/**
* Check whether there are bytes available to be read
* @code
* if(radio.available()){
* radio.read(&data,sizeof(data));
* }
* @endcode
* @return True if there is a payload available, false if none is
*/
bool available(void);
/**
* Read the available payload
*
* The size of data read is the fixed payload size, see getPayloadSize()
*
* @note I specifically chose 'void*' as a data type to make it easier
* for beginners to use. No casting needed.
*
* @note No longer boolean. Use available to determine if packets are
* available. Interrupt flags are now cleared during reads instead of
* when calling available().
*
* @param buf Pointer to a buffer where the data should be written
* @param len Maximum number of bytes to read into the buffer
*
* @code
* if(radio.available()){
* radio.read(&data,sizeof(data));
* }
* @endcode
* @return No return value. Use available().
*/
uint8_t read( void* buf, uint8_t len );
/**
* Be sure to call openWritingPipe() first to set the destination
* of where to write to.
*
* This blocks until the message is successfully acknowledged by
* the receiver or the timeout/retransmit maxima are reached. In
* the current configuration, the max delay here is 60-70ms.
*
* The maximum size of data written is the fixed payload size, see
* getPayloadSize(). However, you can write less, and the remainder
* will just be filled with zeroes.
*
* TX/RX/RT interrupt flags will be cleared every time write is called
*
* @param buf Pointer to the data to be sent
* @param len Number of bytes to be sent
*
* @code
* radio.stopListening();
* radio.write(&data,sizeof(data));
* @endcode
* @return True if the payload was delivered successfully false if not
*/
bool write( const void* buf, uint8_t len );
/**
* New: Open a pipe for writing via byte array. Old addressing format retained
* for compatibility.
*
* Only one writing pipe can be open at once, but you can change the address
* you'll write to. Call stopListening() first.
*
* Addresses are assigned via a byte array, default is 5 byte address length
s *
* @code
* uint8_t addresses[][6] = {"1Node","2Node"};
* radio.openWritingPipe(addresses[0]);
* @endcode
* @code
* uint8_t address[] = { 0xCC,0xCE,0xCC,0xCE,0xCC };
* radio.openWritingPipe(address);
* address[0] = 0x33;
* radio.openReadingPipe(1,address);
* @endcode
* @see setAddressWidth
*
* @param address The address of the pipe to open. Coordinate these pipe
* addresses amongst nodes on the network.
*/
void openWritingPipe(const uint8_t *address);
/**
* Open a pipe for reading
*
* Up to 6 pipes can be open for reading at once. Open all the required
* reading pipes, and then call startListening().
*
* @see openWritingPipe
* @see setAddressWidth
*
* @note Pipes 0 and 1 will store a full 5-byte address. Pipes 2-5 will technically
* only store a single byte, borrowing up to 4 additional bytes from pipe #1 per the
* assigned address width.
* @warning Pipes 1-5 should share the same address, except the first byte.
* Only the first byte in the array should be unique, e.g.
* @code
* uint8_t addresses[][6] = {"1Node","2Node"};
* openReadingPipe(1,addresses[0]);
* openReadingPipe(2,addresses[1]);
* @endcode
*
* @warning Pipe 0 is also used by the writing pipe. So if you open
* pipe 0 for reading, and then startListening(), it will overwrite the
* writing pipe. Ergo, do an openWritingPipe() again before write().
*
* @param number Which pipe# to open, 0-5.
* @param address The 24, 32 or 40 bit address of the pipe to open.
*/
void openReadingPipe(uint8_t number, const uint8_t *address);
/**@}*/
/**
* @name Advanced Operation
*
* Methods you can use to drive the chip in more advanced ways
*/
/**@{*/
/**
* Print a giant block of debugging information to stdout
*
* @warning Does nothing if stdout is not defined. See fdevopen in stdio.h
* The printf.h file is included with the library for Arduino.
* @code
* #include <printf.h>
* setup(){
* Serial.begin(115200);
* printf_begin();
* ...
* }
* @endcode
*/
void printDetails(void);
/**
* Test whether there are bytes available to be read in the
* FIFO buffers.
*
* @param[out] pipe_num Which pipe has the payload available
*
* @code
* uint8_t pipeNum;
* if(radio.available(&pipeNum)){
* radio.read(&data,sizeof(data));
* Serial.print("Got data on pipe");
* Serial.println(pipeNum);
* }
* @endcode
* @return True if there is a payload available, false if none is
*/
bool available(uint8_t* pipe_num);
/**
* Check if the radio needs to be read. Can be used to prevent data loss
* @return True if all three 32-byte radio buffers are full
*/
bool rxFifoFull();
/**
* Enter low-power mode
*
* To return to normal power mode, call powerUp().
*
* @note After calling startListening(), a basic radio will consume about 13.5mA
* at max PA level.
* During active transmission, the radio will consume about 11.5mA, but this will
* be reduced to 26uA (.026mA) between sending.
* In full powerDown mode, the radio will consume approximately 900nA (.0009mA)
*
* @code
* radio.powerDown();
* avr_enter_sleep_mode(); // Custom function to sleep the device
* radio.powerUp();
* @endcode
*/
void powerDown(void);
/**
* Leave low-power mode - required for normal radio operation after calling powerDown()
*
* To return to low power mode, call powerDown().
* @note This will take up to 5ms for maximum compatibility
*/
void powerUp(void) ;
/**
* Write for single NOACK writes. Optionally 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 );
/**
* This will not block until the 3 FIFO buffers are filled with data.
* Once the FIFOs are full, writeFast will simply wait for success or
* timeout, and return 1 or 0 respectively. From a user perspective, just
* keep trying to send the same data. The library will keep auto retrying
* the current payload using the built in functionality.
* @warning It is important to never keep the nRF24L01 in TX mode and FIFO full for more than 4ms at a time. If the auto
* retransmit is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
* to clear by issuing txStandBy() or ensure appropriate time between transmissions.
*
* @code
* Example (Partial blocking):
*
* radio.writeFast(&buf,32); // Writes 1 payload to the buffers
* txStandBy(); // Returns 0 if failed. 1 if success. Blocks only until MAX_RT timeout or success. Data flushed on fail.
*
* radio.writeFast(&buf,32); // Writes 1 payload to the buffers
* txStandBy(1000); // Using extended timeouts, returns 1 if success. Retries failed payloads for 1 seconds before returning 0.
* @endcode
*
* @see txStandBy()
* @see write()
* @see writeBlocking()
*
* @param buf Pointer to the data to be sent
* @param len Number of bytes to be sent
* @return True if the payload was delivered successfully false if not
*/
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 );
/**
* This function extends the auto-retry mechanism to any specified duration.
* It will not block until the 3 FIFO buffers are filled with data.
* If so the library will auto retry until a new payload is written
* or the user specified timeout period is reached.
* @warning It is important to never keep the nRF24L01 in TX mode and FIFO full for more than 4ms at a time. If the auto
* retransmit is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
* to clear by issuing txStandBy() or ensure appropriate time between transmissions.
*
* @code
* Example (Full blocking):
*
* radio.writeBlocking(&buf,32,1000); //Wait up to 1 second to write 1 payload to the buffers
* txStandBy(1000); //Wait up to 1 second for the payload to send. Return 1 if ok, 0 if failed.
* //Blocks only until user timeout or success. Data flushed on fail.
* @endcode
* @note If used from within an interrupt, the interrupt should be disabled until completion, and sei(); called to enable millis().
* @see txStandBy()
* @see write()
* @see writeFast()
*
* @param buf Pointer to the data to be sent
* @param len Number of bytes to be sent
* @param timeout User defined timeout in milliseconds.
* @return True if the payload was loaded into the buffer successfully false if not
*/
bool writeBlocking( const void* buf, uint8_t len, uint32_t timeout );
/**
* This function should be called as soon as transmission is finished to
* drop the radio back to STANDBY-I mode. If not issued, the radio will
* remain in STANDBY-II mode which, per the data sheet, is not a recommended
* operating mode.
*
* @note When transmitting data in rapid succession, it is still recommended by
* the manufacturer to drop the radio out of TX or STANDBY-II mode if there is
* time enough between sends for the FIFOs to empty. This is not required if auto-ack
* is enabled.
*
* Relies on built-in auto retry functionality.
*
* @code
* Example (Partial blocking):
*
* radio.writeFast(&buf,32);
* radio.writeFast(&buf,32);
* radio.writeFast(&buf,32); //Fills the FIFO buffers up
* bool ok = txStandBy(); //Returns 0 if failed. 1 if success.
* //Blocks only until MAX_RT timeout or success. Data flushed on fail.
* @endcode
* @see txStandBy(unsigned long timeout)
* @return True if transmission is successful
*
*/
bool txStandBy();
/**
* This function allows extended blocking and auto-retries per a user defined timeout
* @code
* Fully Blocking Example:
*
* radio.writeFast(&buf,32);
* radio.writeFast(&buf,32);
* radio.writeFast(&buf,32); //Fills the FIFO buffers up
* bool ok = txStandBy(1000); //Returns 0 if failed after 1 second of retries. 1 if success.
* //Blocks only until user defined timeout or success. Data flushed on fail.
* @endcode
* @note If used from within an interrupt, the interrupt should be disabled until completion, and sei(); called to enable millis().
* @param timeout Number of milliseconds to retry failed payloads
* @return True if transmission is successful
*
*/
bool txStandBy(uint32_t timeout, bool startTx = 0);
/**
* Write an ack payload for the specified pipe
*
* The next time a message is received on @p pipe, the data in @p buf will
* be sent back in the acknowledgement.
* @see enableAckPayload()
* @see enableDynamicPayloads()
* @warning Only three of these can be pending at any time as there are only 3 FIFO buffers.<br> Dynamic payloads must be enabled.
* @note Ack payloads are handled automatically by the radio chip when a payload is received. Users should generally
* write an ack payload as soon as startListening() is called, so one is available when a regular payload is received.
* @note Ack payloads are dynamic payloads. This only works on pipes 0&1 by default. Call
* enableDynamicPayloads() to enable on all pipes.
*
* @param pipe Which pipe# (typically 1-5) will get this response.
* @param buf Pointer to data that is sent
* @param len Length of the data to send, up to 32 bytes max. Not affected
* by the static payload set by setPayloadSize().
*/
void writeAckPayload(uint8_t pipe, const void* buf, uint8_t len);
/**
* Determine if an ack payload was received in the most recent call to
* write(). The regular available() can also be used.
*
* Call read() to retrieve the ack payload.
*
* @return True if an ack payload is available.
*/
bool isAckPayloadAvailable(void);
/**
* Call this when you get an interrupt to find out why
*
* Tells you what caused the interrupt, and clears the state of
* interrupts.
*
* @param[out] tx_ok The send was successful (TX_DS)
* @param[out] tx_fail The send failed, too many retries (MAX_RT)
* @param[out] rx_ready There is a message waiting to be read (RX_DS)
*/
void whatHappened(bool& tx_ok,bool& tx_fail,bool& rx_ready);
/**
* Non-blocking write to the open writing pipe used for buffered writes
*
* @note Optimization: This function now leaves the CE pin high, so the radio
* will remain in TX or STANDBY-II Mode until a txStandBy() command is issued. Can be used as an alternative to startWrite()
* if writing multiple payloads at once.
* @warning It is important to never keep the nRF24L01 in TX mode with FIFO full for more than 4ms at a time. If the auto
* retransmit/autoAck is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
* to clear by issuing txStandBy() or ensure appropriate time between transmissions.
*
* @see write()
* @see writeFast()
* @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, const bool multicast, bool startTx = 1 );
/**
* Non-blocking write to the open writing pipe
*
* Just like write(), but it returns immediately. To find out what happened
* to the send, catch the IRQ and then call whatHappened().
*
* @see write()
* @see writeFast()
* @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, const bool multicast );
/**
* This function is mainly used internally to take advantage of the auto payload
* re-use functionality of the chip, but can be beneficial to users as well.
*
* The function will instruct the radio to re-use the data in the FIFO buffers,
* and instructs the radio to re-send once the timeout limit has been reached.
* Used by writeFast and writeBlocking to initiate retries when a TX failure
* occurs. Retries are automatically initiated except with the standard write().
* This way, data is not flushed from the buffer until switching between modes.
*
* @note This is to be used AFTER auto-retry fails if wanting to resend
* using the built-in payload reuse features.
* After issuing reUseTX(), it will keep reending the same payload forever or until
* a payload is written to the FIFO, or a flush_tx command is given.
*/
void reUseTX();
/**
* Empty the transmit buffer. This is generally not required in standard operation.
* May be required in specific cases after stopListening() , if operating at 250KBPS data rate.
*
* @return Current value of status register
*/
uint8_t flush_tx(void);
/**
* Test whether there was a carrier on the line for the
* previous listening period.
*
* Useful to check for interference on the current channel.
*
* @return true if was carrier, false if not
*/
bool testCarrier(void);
/**
* Test whether a signal (carrier or otherwise) greater than
* or equal to -64dBm is present on the channel. Valid only
* on nRF24L01P (+) hardware. On nRF24L01, use testCarrier().
*
* Useful to check for interference on the current channel and
* channel hopping strategies.
*
* @code
* bool goodSignal = radio.testRPD();
* if(radio.available()){
* Serial.println(goodSignal ? "Strong signal > 64dBm" : "Weak signal < 64dBm" );
* radio.read(0,0);
* }
* @endcode
* @return true if signal => -64dBm, false if not
*/
bool testRPD(void) ;
/**
* Test whether this is a real radio, or a mock shim for
* debugging. Setting either pin to 0xff is the way to
* indicate that this is not a real radio.
*
* @return true if this is a legitimate radio
*/
bool isValid() { return ce_pin != 0xff && csn_pin != 0xff; }
/**
* Close a pipe after it has been previously opened.
* Can be safely called without having previously opened a pipe.
* @param pipe Which pipe # to close, 0-5.
*/
void closeReadingPipe( uint8_t pipe ) ;
/**
* Enable error detection by un-commenting #define FAILURE_HANDLING in RF24_config.h
* If a failure has been detected, it usually indicates a hardware issue. By default the library
* will cease operation when a failure is detected.
* This should allow advanced users to detect and resolve intermittent hardware issues.
*
* In most cases, the radio must be re-enabled via radio.begin(); and the appropriate settings
* applied after a failure occurs, if wanting to re-enable the device immediately.
*
* Usage: (Failure handling must be enabled per above)
* @code
* if(radio.failureDetected){
* radio.begin(); // Attempt to re-configure the radio with defaults
* radio.failureDetected = 0; // Reset the detection value
* radio.openWritingPipe(addresses[1]); // Re-configure pipe addresses
* radio.openReadingPipe(1,addresses[0]);
* report_failure(); // Blink leds, send a message, etc. to indicate failure
* }
* @endcode
*/
//#if defined (FAILURE_HANDLING)
bool failureDetected;
//#endif
/**@}*/
/**@}*/
/**
* @name Optional Configurators
*
* Methods you can use to get or set the configuration of the chip.
* None are required. Calling begin() sets up a reasonable set of
* defaults.
*/
/**@{*/
/**
* Set the address width from 3 to 5 bytes (24, 32 or 40 bit)
*
* @param a_width The address width to use: 3,4 or 5
*/
void setAddressWidth(uint8_t a_width);
/**
* Set the number and delay of retries upon failed submit
*
* @param delay How long to wait between each retry, in multiples of 250us,
* max is 15. 0 means 250us, 15 means 4000us.
* @param count How many retries before giving up, max 15
*/
void setRetries(uint8_t delay, uint8_t count);
/**
* Set RF communication channel
*
* @param channel Which RF channel to communicate on, 0-125
*/
void setChannel(uint8_t channel);
/**
* Get RF communication channel
*
* @return The currently configured RF Channel
*/
uint8_t getChannel(void);
/**
* Set Static Payload Size
*
* This implementation uses a pre-stablished fixed payload size for all
* transmissions. If this method is never called, the driver will always
* transmit the maximum payload size (32 bytes), no matter how much
* was sent to write().
*
* @todo Implement variable-sized payloads feature
*
* @param size The number of bytes in the payload
*/
void setPayloadSize(uint8_t size);
/**
* Get Static Payload Size
*
* @see setPayloadSize()
*
* @return The number of bytes in the payload
*/
uint8_t getPayloadSize(void);
/**
* Get Dynamic Payload Size
*
* For dynamic payloads, this pulls the size of the payload off
* the chip
*
* @note Corrupt packets are now detected and flushed per the
* manufacturer.
* @code
* if(radio.available()){
* if(radio.getDynamicPayloadSize() < 1){
* // Corrupt payload has been flushed
* return;
* }
* radio.read(&data,sizeof(data));
* }
* @endcode
*
* @return Payload length of last-received dynamic payload
*/
uint8_t getDynamicPayloadSize(void);
/**
* Enable custom payloads on the acknowledge packets
*
* Ack payloads are a handy way to return data back to senders without
* manually changing the radio modes on both units.
*
* @note Ack payloads are dynamic payloads. This only works on pipes 0&1 by default. Call
* enableDynamicPayloads() to enable on all pipes.
*/
void enableAckPayload(void);
/**
* Enable dynamically-sized payloads
*
* This way you don't always have to send large packets just to send them
* once in a while. This enables dynamic payloads on ALL pipes.
*
*/
void enableDynamicPayloads(void);
/**
* Enable dynamic ACKs (single write multicast or unicast) for chosen messages
*
* @note To enable full multicast 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 whether the hardware is an nRF24L01+ or not.
*
* @return true if the hardware is nRF24L01+ (or compatible) and false
* if its not.
*/
bool isPVariant(void) ;
/**
* Enable or disable auto-acknowlede packets
*
* This is enabled by default, so it's only needed if you want to turn
* it off for some reason.
*
* @param enable Whether to enable (true) or disable (false) auto-acks
*/
void setAutoAck(bool enable);
/**
* Enable or disable auto-acknowlede packets on a per pipeline basis.
*
* AA is enabled by default, so it's only needed if you want to turn
* it off/on for some reason on a per pipeline basis.
*
* @param pipe Which pipeline to modify
* @param enable Whether to enable (true) or disable (false) auto-acks
*/
void setAutoAck( uint8_t pipe, bool enable ) ;
/**
* Set Power Amplifier (PA) level to one of four levels:
* RF24_PA_MIN, RF24_PA_LOW, RF24_PA_HIGH and RF24_PA_MAX
*
* The power levels correspond to the following output levels respectively:
* NRF24L01: -18dBm, -12dBm,-6dBM, and 0dBm
*
* SI24R1: -6dBm, 0dBm, 3dBM, and 7dBm.
*
* @param level Desired PA level.
*/
void setPALevel ( uint8_t level );
/**
* Fetches the current PA level.
*
* NRF24L01: -18dBm, -12dBm, -6dBm and 0dBm
* SI24R1: -6dBm, 0dBm, 3dBm, 7dBm
*
* @return Returns values 0 to 3 representing the PA Level.
*/
uint8_t getPALevel( void );
/**
* Set the transmission data rate
*
* @warning setting RF24_250KBPS will fail for non-plus units
*
* @param speed RF24_250KBPS for 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS for 2Mbps
* @return true if the change was successful
*/
bool setDataRate(rf24_datarate_e speed);
/**
* Fetches the transmission data rate
*
* @return Returns the hardware's currently configured datarate. The value
* is one of 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS, as defined in the
* rf24_datarate_e enum.
*/
rf24_datarate_e getDataRate( void ) ;
/**
* Set the CRC length
* <br>CRC checking cannot be disabled if auto-ack is enabled
* @param length RF24_CRC_8 for 8-bit or RF24_CRC_16 for 16-bit
*/
void setCRCLength(rf24_crclength_e length);
/**
* Get the CRC length
* <br>CRC checking cannot be disabled if auto-ack is enabled
* @return RF24_CRC_DISABLED if disabled or RF24_CRC_8 for 8-bit or RF24_CRC_16 for 16-bit
*/
rf24_crclength_e getCRCLength(void);
/**
* Disable CRC validation
*
* @warning CRC cannot be disabled if auto-ack/ESB is enabled.
*/
void disableCRC( void ) ;
/**
* The radio will generate interrupt signals when a transmission is complete,
* a transmission fails, or a payload is received. This allows users to mask
* those interrupts to prevent them from generating a signal on the interrupt
* pin. Interrupts are enabled on the radio chip by default.
*
* @code
* Mask all interrupts except the receive interrupt:
*
* radio.maskIRQ(1,1,0);
* @endcode
*
* @param tx_ok Mask transmission complete interrupts
* @param tx_fail Mask transmit failure interrupts
* @param rx_ready Mask payload received interrupts
*/
void maskIRQ(bool tx_ok,bool tx_fail,bool rx_ready);
/**
*
* The driver will delay for this duration when stopListening() is called
*
* When responding to payloads, faster devices like ARM(RPi) are much faster than Arduino:
* 1. Arduino sends data to RPi, switches to RX mode
* 2. The RPi receives the data, switches to TX mode and sends before the Arduino radio is in RX mode
* 3. If AutoACK is disabled, this can be set as low as 0. If AA/ESB enabled, set to 100uS minimum on RPi
*
* @warning If set to 0, ensure 130uS delay after stopListening() and before any sends
*/
uint32_t txDelay;
/**
*
* On all devices but Linux and ATTiny, a small delay is added to the CSN toggling function
*
* This is intended to minimise the speed of SPI polling due to radio commands
*
* If using interrupts or timed requests, this can be set to 0 Default:5
*/
uint32_t csDelay;
/**@}*/
/**
* @name Deprecated
*
* Methods provided for backwards compabibility.
*/
/**@{*/
/**
* Open a pipe for reading
* @note For compatibility with old code only, see new function
*
* @warning Pipes 1-5 should share the first 32 bits.
* Only the least significant byte should be unique, e.g.
* @code
* openReadingPipe(1,0xF0F0F0F0AA);
* openReadingPipe(2,0xF0F0F0F066);
* @endcode
*
* @warning Pipe 0 is also used by the writing pipe. So if you open
* pipe 0 for reading, and then startListening(), it will overwrite the
* writing pipe. Ergo, do an openWritingPipe() again before write().
*
* @param number Which pipe# to open, 0-5.
* @param address The 40-bit address of the pipe to open.
*/
void openReadingPipe(uint8_t number, uint64_t address);
/**
* Open a pipe for writing
* @note For compatibility with old code only, see new function
*
* Addresses are 40-bit hex values, e.g.:
*
* @code
* openWritingPipe(0xF0F0F0F0F0);
* @endcode
*
* @param address The 40-bit address of the pipe to open.
*/
void openWritingPipe(uint64_t address);
/**
* Empty the receive buffer
*
* @return Current value of status register
*/
uint8_t flush_rx(void);
private:
/**
* @name Low-level internal interface.
*
* Protected methods that address the chip directly. Regular users cannot
* ever call these. They are documented for completeness and for developers who
* may want to extend this class.
*/
/**@{*/
/**
* Set chip select pin
*
* Running SPI bus at PI_CLOCK_DIV2 so we don't waste time transferring data
* and best of all, we make use of the radio's FIFO buffers. A lower speed
* means we're less likely to effectively leverage our FIFOs and pay a higher
* AVR runtime cost as toll.