API for the RF22 Transceiver Module. More...

Detailed Description

ID: rf22
Name: ISM Band Radio Transceiver
Other Names: RFM22B
Category: wifi
Manufacturer: sparkfun
Link: https://www.sparkfun.com/products/12030
Connection: spi

This base class provides basic functions for sending and receiving unaddressable, unreliable datagrams of arbitrary length to 255 octets per packet.

Subclasses may use this class to implement reliable, addressed datagrams and streams, mesh routers, repeaters, translators etc.

On transmission, the TO and FROM addresses default to 0x00, unless changed by a subclass. On reception the TO addressed is checked against the node address (defaults to 0x00) or the broadcast address (which is 0xff). The ID and FLAGS are set to 0, and not checked by this class. This permits use of the this base RF22 class as an unaddressable, unreliable datagram service. Subclasses are expected to change this behavior to add node address, ids, retransmission etc.

Naturally, for any 2 radios to communicate that must be configured to use the same frequency and modulation scheme.

RF22 Sensor image provided by SparkFun* under CC BY 2.0.

int
main(int argc, char** argv)
{
    // SPI bus 0, CS pin 10, INTR pin 2
    upm::RF22 rf22(0, 10, 2);
    if (!rf22.init()) {
        std::cout << "RF22 init failed" << std::endl;
        return 0x1;
    }
    uint8_t buf[RF22_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    signal(SIGINT, sig_handler);
    while (amWorking) {
        // rf22.waitAvailable();
        rf22.waitAvailableTimeout(500);
        // Should be a message for us now
        if (rf22.recv(buf, &len)) {
            std::cout << "got request: " << (char*) buf << std::endl;
            // Send a reply
            uint8_t data[] = "And hello back to you";
            rf22.send(data, sizeof(data));
            rf22.waitPacketSent();
        } else {
            // Do whatever you need.
        }
    }
    std::cout << "Exit 'rfm22-server'" << std::endl;
    return 0;
}

int
main(int argc, char** argv)
{
    // SPI bus 0, CS pin 10, INTR pin 2
    upm::RF22 rf22(0, 10, 2);
    if (!rf22.init()) {
        std::cout << "RF22 init failed" << std::endl;
        return 0x1;
    }
    uint8_t data[] = "Hello World!";
    uint8_t buf[RF22_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    signal(SIGINT, sig_handler);
    while (amWorking) {
        std::cout << "Sending to rf22_server" << std::endl;
        // Send a message to rf22_server
        rf22.send(data, sizeof(data));
        rf22.waitPacketSent();
        // Now wait for a reply
        rf22.waitAvailableTimeout(1000000);
        if (rf22.recv(buf, &len)) {
            std::cout << "got response: " << (char*) buf << std::endl;
        } else {
            std::cout << "!!! NO RESPONSE !!!" << std::endl;
        }
    }
    std::cout << "Exit 'rfm22-client'" << std::endl;
    return 0;
}

Data Structures
struct	ModemConfig
	Defines register values for a set of modem configuration registers. More...

Public Member Functions
	RF22 (int spiBus=0, int slaveSelectPin=10, int interruptPin=2)

virtual	~RF22 ()

uint8_t	init ()

void	reset ()

uint8_t	spiRead (uint8_t reg)

void	spiWrite (uint8_t reg, uint8_t val)

void	spiBurstRead (uint8_t reg, uint8_t *dest, uint8_t len)

void	spiBurstWrite (uint8_t reg, const uint8_t *src, uint8_t len)

uint8_t	statusRead ()

uint8_t	adcRead (uint8_t adcsel=RF22_ADCSEL_INTERNAL_TEMPERATURE_SENSOR, uint8_t adcref=RF22_ADCREF_BANDGAP_VOLTAGE, uint8_t adcgain=0, uint8_t adcoffs=0)

uint8_t	temperatureRead (uint8_t tsrange=RF22_TSRANGE_M64_64C, uint8_t tvoffs=0)

uint16_t	wutRead ()

void	setWutPeriod (uint16_t wtm, uint8_t wtr=0, uint8_t wtd=0)

uint8_t	setFrequency (float center, float afcPullInRange=0.05)

uint8_t	setFHStepSize (uint8_t fhs)

uint8_t	setFHChannel (uint8_t fhch)

uint8_t	rssiRead ()

uint8_t	ezmacStatusRead ()

void	setMode (uint8_t mode)

void	setModeIdle ()

void	setModeRx ()

void	setModeTx ()

uint8_t	mode ()

void	setTxPower (uint8_t power)

void	setModemRegisters (const ModemConfig *config)

uint8_t	setModemConfig (ModemConfigChoice index)

uint8_t	available ()

void	waitAvailable ()

bool	waitAvailableTimeout (unsigned long timeout)

uint8_t	recv (uint8_t buf, uint8_t len)

uint8_t	send (const uint8_t *data, uint8_t len)

void	waitPacketSent ()

void	setPromiscuous (uint8_t promiscuous)

uint8_t	headerTo ()

uint8_t	headerFrom ()

uint8_t	headerId ()

uint8_t	headerFlags ()

uint8_t	lastRssi ()

void	setPreambleLength (uint8_t nibbles)

void	setSyncWords (const uint8_t *syncWords, uint8_t len)

Static Public Member Functions
static void	printBuffer (const char prompt, const uint8_t buf, uint8_t len)

Protected Member Functions
void	handleInterrupt ()

void	clearRxBuf ()

void	clearTxBuf ()

uint8_t	fillTxBuf (const uint8_t *data, uint8_t len)

uint8_t	appendTxBuf (const uint8_t *data, uint8_t len)

void	sendNextFragment ()

void	readNextFragment ()

void	resetFifos ()

void	resetRxFifo ()

void	resetTxFifo ()

virtual void	handleExternalInterrupt ()

virtual void	handleWakeupTimerInterrupt ()

void	setHeaderTo (uint8_t to)

void	setHeaderFrom (uint8_t from)

void	setHeaderId (uint8_t id)

void	setHeaderFlags (uint8_t flags)

void	startTransmit ()

void	restartTransmit ()

uint64_t	getTimestamp ()

Member Enumeration Documentation

enum ModemConfigChoice

Choices for setModemConfig() for a selected subset of common modulation types, and data rates. If you need another configuration, use the register calculator. and call setModemRegisters() with your desired settings These are indexes into _modemConfig

Enumerator
UnmodulatedCarrier	Unmodulated carrier for testing.
FSK_PN9_Rb2Fd5	FSK, No Manchester, Rb = 2kbs, Fd = 5kHz, PN9 random modulation for testing.
FSK_Rb2Fd5	FSK, No Manchester, Rb = 2kbs, Fd = 5kHz.
FSK_Rb2_4Fd36	FSK, No Manchester, Rb = 2.4kbs, Fd = 36kHz.
FSK_Rb4_8Fd45	FSK, No Manchester, Rb = 4.8kbs, Fd = 45kHz.
FSK_Rb9_6Fd45	FSK, No Manchester, Rb = 9.6kbs, Fd = 45kHz.
FSK_Rb19_2Fd9_6	FSK, No Manchester, Rb = 19.2kbs, Fd = 9.6kHz.
FSK_Rb38_4Fd19_6	FSK, No Manchester, Rb = 38.4kbs, Fd = 19.6kHz.
FSK_Rb57_6Fd28_8	FSK, No Manchester, Rb = 57.6kbs, Fd = 28.8kHz.
FSK_Rb125Fd125	FSK, No Manchester, Rb = 125kbs, Fd = 125kHz.
GFSK_Rb2Fd5	GFSK, No Manchester, Rb = 2kbs, Fd = 5kHz.
GFSK_Rb2_4Fd36	GFSK, No Manchester, Rb = 2.4kbs, Fd = 36kHz.
GFSK_Rb4_8Fd45	GFSK, No Manchester, Rb = 4.8kbs, Fd = 45kHz.
GFSK_Rb9_6Fd45	GFSK, No Manchester, Rb = 9.6kbs, Fd = 45kHz.
GFSK_Rb19_2Fd9_6	GFSK, No Manchester, Rb = 19.2kbs, Fd = 9.6kHz.
GFSK_Rb38_4Fd19_6	GFSK, No Manchester, Rb = 38.4kbs, Fd = 19.6kHz.
GFSK_Rb57_6Fd28_8	GFSK, No Manchester, Rb = 57.6kbs, Fd = 28.8kHz.
GFSK_Rb125Fd125	GFSK, No Manchester, Rb = 125kbs, Fd = 125kHz.
OOK_Rb1_2Bw75	OOK, No Manchester, Rb = 1.2kbs, Rx Bandwidth = 75kHz.
OOK_Rb2_4Bw335	OOK, No Manchester, Rb = 2.4kbs, Rx Bandwidth = 335kHz.
OOK_Rb4_8Bw335	OOK, No Manchester, Rb = 4.8kbs, Rx Bandwidth = 335kHz.
OOK_Rb9_6Bw335	OOK, No Manchester, Rb = 9.6kbs, Rx Bandwidth = 335kHz.
OOK_Rb19_2Bw335	OOK, No Manchester, Rb = 19.2kbs, Rx Bandwidth = 335kHz.
OOK_Rb38_4Bw335	OOK, No Manchester, Rb = 38.4kbs, Rx Bandwidth = 335kHz.
OOK_Rb40Bw335	OOK, No Manchester, Rb = 40kbs, Rx Bandwidth = 335kHz.

Constructor & Destructor Documentation

RF22	(	int	spiBus = `0`,
		int	slaveSelectPin = `10`,
		int	interruptPin = `2`
	)

Constructor. You can have multiple instances, but each instance must have its own interrupt and slave select pin. After constructing, you must call init() to initialize the interface and the radio module

Parameters

[in]	spiBus	Pointer to the SPI interface object to use. Default 0 or the standard Arduino hardware SPI interface
[in]	slaveSelectPin	the Arduino pin number of the output to use to select the RF22 before accessing it. Default is 10 or the normal SS pin for Arduino
[in]	interruptPin	The interrupt pin number to use. Default is 2

~RF22 ( )

virtual

Destructor.

Member Function Documentation

uint8_t init ( )

Initializes this instance and the radio module connected to it. The following steps are taken:

Software reset the RF22 module
Checks the connected RF22 module is either a RF22_DEVICE_TYPE_RX_TRX or a RF22_DEVICE_TYPE_TX
Configures the RF22 module
Sets the frequency to 434.0 MHz
Sets the modem data rate to FSK_Rb2_4Fd36
Returns
true if everything was successful

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void reset ( )

Issues a software reset to the RF22 module. Blocks for 1ms to ensure the reset is complete.

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uint8_t spiRead ( uint8_t reg )

Reads a single register from the RF22

Parameters

[in] reg Register number, one of RF22_REG_*

Returns: The value of the register

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void spiWrite	(	uint8_t	reg,
		uint8_t	val
	)

Writes a single byte to the RF22

Parameters

[in]	reg	Register number, one of RF22_REG_*
[in]	val	The value to write

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void spiBurstRead	(	uint8_t	reg,
		uint8_t *	dest,
		uint8_t	len
	)

Reads a number of consecutive registers from the RF22 using burst read mode

Parameters

[in]	reg	Register number of the first register, one of RF22_REG_*
[in]	dest	Array to write the register values to. Must be at least len bytes
[in]	len	Number of bytes to read

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void spiBurstWrite	(	uint8_t	reg,
		const uint8_t *	src,
		uint8_t	len
	)

Write a number of consecutive registers using burst write mode

Parameters

[in]	reg	Register number of the first register, one of RF22_REG_*
[in]	src	Array of new register values to write. Must be at least len bytes
[in]	len	Number of bytes to write

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uint8_t statusRead ( )

Reads and returns the device status register RF22_REG_02_DEVICE_STATUS

Returns: The value of the device status register

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uint8_t adcRead	(	uint8_t	adcsel = `RF22_ADCSEL_INTERNAL_TEMPERATURE_SENSOR`,
		uint8_t	adcref = `RF22_ADCREF_BANDGAP_VOLTAGE`,
		uint8_t	adcgain = `0`,
		uint8_t	adcoffs = `0`
	)

Reads a value from the on-chip analog-digital converter

Parameters

[in]	adcsel	Selects the ADC input to measure. One of RF22_ADCSEL_*. Defaults to the internal temperature sensor
[in]	adcref	Specifies the reference voltage to use. One of RF22_ADCREF_*. Defaults to the internal bandgap voltage.
[in]	adcgain	Amplifier gain selection.
[in]	adcoffs	Amplifier offset (0 to 15).

Returns: The analog value. 0 to 255.

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uint8_t temperatureRead	(	uint8_t	tsrange = `RF22_TSRANGE_M64_64C`,
		uint8_t	tvoffs = `0`
	)

Reads the on-chip temperature sensor

Parameters

[in]	tsrange	Specifies the temperature range to use. One of RF22_TSRANGE_*
[in]	tvoffs	Specifies the temperature value offset. This is actually signed value added to the measured temperature value

Returns: The measured temperature.

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uint16_t wutRead ( )

Reads the wakeup timer value in registers RF22_REG_17_WAKEUP_TIMER_VALUE1 and RF22_REG_18_WAKEUP_TIMER_VALUE2

Returns: The wakeup timer value

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void setWutPeriod	(	uint16_t	wtm,
		uint8_t	wtr = `0`,
		uint8_t	wtd = `0`
	)

Sets the wakeup timer period registers RF22_REG_14_WAKEUP_TIMER_PERIOD1, RF22_REG_15_WAKEUP_TIMER_PERIOD2 and RF22_R<EG_16_WAKEUP_TIMER_PERIOD3

Parameters

[in]	wtm	Wakeup timer mantissa value
[in]	wtr	Wakeup timer exponent R value
[in]	wtd	Wakeup timer exponent D value

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uint8_t setFrequency	(	float	center,
		float	afcPullInRange = `0.05`
	)

Sets the transmitter and receiver center frequency

Parameters

[in]	center	Frequency in MHz. 240.0 to 960.0. Caution, some versions of RF22 and derivatives implemented more restricted frequency ranges.
[in]	afcPullInRange	Sets the AF Pull In Range in MHz. Defaults to 0.05MHz (50kHz). Range is 0.0 to 0.159375 for frequencies 240.0 to 480MHz, and 0.0 to 0.318750MHz for frequencies 480.0 to 960MHz,

Returns: true if the selected frequency center + (fhch * fhs) is within range and the afcPullInRange is within range

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uint8_t setFHStepSize ( uint8_t fhs )

Sets the frequency hopping step size.

Parameters

[in] fhs Frequency Hopping step size in 10kHz increments

Returns: true if center + (fhch * fhs) is within limits

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uint8_t setFHChannel ( uint8_t fhch )

Sets the frequency hopping channel. Adds fhch * fhs to center frequency

Parameters

[in] fhch The channel number

Returns: true if the selected frequency center + (fhch * fhs) is within range

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uint8_t rssiRead ( )

Reads and returns the current RSSI value from register RF22_REG_26_RSSI. If you want to find the RSSI of the last received message, use lastRssi() instead.

Returns: The current RSSI value

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uint8_t ezmacStatusRead ( )

Reads and returns the current EZMAC value from register RF22_REG_31_EZMAC_STATUS

Returns: The current EZMAC value

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void setMode ( uint8_t mode )

Sets the parameters for the RF22 Idle mode in register RF22_REG_07_OPERATING_MODE. Idle mode is the mode the RF22 will be in when not transmitting or receiving. The default idle mode is RF22_XTON i.e. READY mode.

Parameters

[in] mode Mask of mode bits, using RF22_SWRES, RF22_ENLBD, RF22_ENWT, RF22_X32KSEL, RF22_PLLON, RF22_XTON.

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void setModeIdle ( )

If current mode is Rx or Tx changes it to Idle. If the transmitter or receiver is running, disables them.

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void setModeRx ( )

If current mode is Tx or Idle, changes it to Rx. Starts the receiver in the RF22.

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void setModeTx ( )

If current mode is Rx or Idle, changes it to Rx. Starts the transmitter in the RF22.

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uint8_t mode ( )

Returns the operating mode of the library.

Returns: the current mode, one of RF22_MODE_*

void setTxPower ( uint8_t power )

Sets the transmitter power output level in register RF22_REG_6D_TX_POWER. Be a good neighbor and set the lowest power level you need. After init(), the power will be set to RF22_TXPOW_8DBM. Caution: In some countries you may only select RF22_TXPOW_17DBM if you are also using frequency hopping.

Parameters

[in] power Transmitter power level, one of RF22_TXPOW_*

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void setModemRegisters ( const ModemConfig * config )

Sets all the registered required to configure the data modem in the RF22, including the data rate, bandwidths etc. You can use this to configure the modem with custom configurations if none of the canned configurations in ModemConfigChoice suit you.

Parameters

[in] config A ModemConfig structure containing values for the modem configuration registers.

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uint8_t setModemConfig ( ModemConfigChoice index )

Select one of the predefined modem configurations. If you need a modem configuration not provided here, use setModemRegisters() with your own ModemConfig.

Parameters

[in] index The configuration choice.

Returns: true if index is a valid choice.

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uint8_t available ( )

Starts the receiver and checks whether a received message is available. This can be called multiple times in a timeout loop

Returns: true if a complete, valid message has been received and is able to be retrieved by recv()

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void waitAvailable ( )

Starts the receiver and blocks until a valid received message is available.

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bool waitAvailableTimeout ( unsigned long timeout )

Starts the receiver and blocks until a received message is available or a timeout

Parameters

[in] timeout Maximum time to wait in milliseconds.

Returns: true if a message is available

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uint8_t recv	(	uint8_t *	buf,
		uint8_t *	len
	)

Turns the receiver on if it not already on. If there is a valid message available, copy it to buf and return true else return false. If a message is copied, *len is set to the length (Caution, 0 length messages are permitted). You should be sure to call this function frequently enough to not miss any messages It is recommended that you call it in your main loop.

Parameters

[in]	buf	Location to copy the received message
[in,out]	len	Pointer to available space in buf. Set to the actual number of octets copied.

Returns: true if a valid message was copied to buf

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uint8_t send	(	const uint8_t *	data,
		uint8_t	len
	)

Waits until any previous transmit packet is finished being transmitted with waitPacketSent(). Then loads a message into the transmitter and starts the transmitter. Note that a message length of 0 is NOT permitted.

Parameters

[in]	data	Array of data to be sent
[in]	len	Number of bytes of data to send (> 0)

Returns: true if the message length was valid and it was correctly queued for transmit

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void waitPacketSent ( )

Blocks until the RF22 is not in mode RF22_MODE_TX (i.e. until the RF22 is not transmitting). This effectively waits until any previous transmit packet is finished being transmitted.

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void setPromiscuous ( uint8_t promiscuous )

Tells the receiver to accept messages with any TO address, not just messages addressed to this node or the broadcast address

Parameters

[in] promiscuous true if you wish to receive messages with any TO address

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uint8_t headerTo ( )

Returns the TO header of the last received message

Returns: The TO header

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uint8_t headerFrom ( )

Returns the FROM header of the last received message

Returns: The FROM header

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uint8_t headerId ( )

Returns the ID header of the last received message

Returns: The ID header

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uint8_t headerFlags ( )

Returns the FLAGS header of the last received message

Returns: The FLAGS header

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uint8_t lastRssi ( )

Returns the RSSI (Receiver Signal Strength Indicator) of the last received message. This measurement is taken when the preamble has been received. It is a (non-linear) measure of the received signal strength.

Returns: The RSSI

void printBuffer	(	const char *	prompt,
		const uint8_t *	buf,
		uint8_t	len
	)

static

Prints a data buffer in HEX. For diagnostic use

Parameters

[in]	prompt	string to preface the print
[in]	buf	Location of the buffer to print
[in]	len	Length of the buffer in octets.

void setPreambleLength ( uint8_t nibbles )

Sets the length of the preamble in 4-bit nibbles. Caution: this should be set to the same value on all nodes in your network. Default is 8. Sets the message preamble length in RF22_REG_34_PREAMBLE_LENGTH

Parameters

[in] nibbles Preamble length in nibbles of 4 bits each.

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void setSyncWords	(	const uint8_t *	syncWords,
		uint8_t	len
	)

Sets the sync words for transmit and receive in registers RF22_REG_36_SYNC_WORD3 to RF22_REG_39_SYNC_WORD0 Caution: this should be set to the same value on all nodes in your network. Default is { 0x2d, 0xd4 }

Parameters

[in]	syncWords	Array of sync words
[in]	len	Number of sync words to set

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void handleInterrupt ( )

protected

This is a low level function to handle the interrupts for one instance of RF22. Called automatically when interrupt pin goes low, should not need to be called by user.

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void clearRxBuf ( )

protected

Clears the receiver buffer. Internal use only

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void clearTxBuf ( )

protected

Clears the transmitter buffer Internal use only

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uint8_t fillTxBuf	(	const uint8_t *	data,
		uint8_t	len
	)

protected

Fills the transmitter buffer with the data of a message to be sent

Parameters

[in]	data	Array of data bytes to be sent (1 to 255)
[in]	len	Number of data bytes in data (> 0)

Returns: true if the message length is valid

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uint8_t appendTxBuf	(	const uint8_t *	data,
		uint8_t	len
	)

protected

Appends the transmitter buffer with the data of a message to be sent

Parameters

[in]	data	Array of data bytes to be sent (0 to 255)
[in]	len	Number of data bytes in data

Returns: false if the resulting message would exceed RF22_MAX_MESSAGE_LEN, else true

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void sendNextFragment ( )

protected

Internal function to load the next fragment of the current message into the transmitter FIFO Internal use only

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void readNextFragment ( )

protected

Function to copy the next fragment from the receiver FIFO into the receiver buffer

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void resetFifos ( )

protected

Clears the RF22 Rx and Tx FIFOs Internal use only

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void resetRxFifo ( )

protected

Clears the RF22 Rx FIFO Internal use only

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void resetTxFifo ( )

protected

Clears the RF22 Tx FIFO Internal use only

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void handleExternalInterrupt ( )

protectedvirtual

This function will be called by handleInterrupt() if an RF22 external interrupt occurs. This can only happen if external interrupts are enabled in the RF22 (which they are not by default). Subclasses may override this function to get control when an RF22 external interrupt occurs.

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void handleWakeupTimerInterrupt ( )

protectedvirtual

This function will be called by handleInterrupt() if an RF22 wakeup timer interrupt occurs. This can only happen if wakeup timer interrupts are enabled in the RF22 (which they are not by default). Subclasses may override this function to get control when an RF22 wakeup timer interrupt occurs.

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void setHeaderTo ( uint8_t to )

protected

Sets the TO header to be sent in all subsequent messages

Parameters

[in] to The new TO header value

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void setHeaderFrom ( uint8_t from )

protected

Sets the FROM header to be sent in all subsequent messages

Parameters

[in] from The new FROM header value

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void setHeaderId ( uint8_t id )

protected

Sets the ID header to be sent in all subsequent messages

Parameters

[in] id The new ID header value

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void setHeaderFlags ( uint8_t flags )

protected

Sets the FLAGS header to be sent in all subsequent messages

Parameters

[in] flags The new FLAGS header value

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void startTransmit ( )

protected

Start the transmission of the contents of the Tx buffer

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void restartTransmit ( )

protected

ReStart the transmission of the contents of the Tx buffer after a transmission failure

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The documentation for this class was generated from the following files:

src/rf22/rf22.hpp
src/rf22/rf22.cxx

Public Types
enum	ModemConfigChoice { UnmodulatedCarrier = 0, FSK_PN9_Rb2Fd5, FSK_Rb2Fd5, FSK_Rb2_4Fd36, FSK_Rb4_8Fd45, FSK_Rb9_6Fd45, FSK_Rb19_2Fd9_6, FSK_Rb38_4Fd19_6, FSK_Rb57_6Fd28_8, FSK_Rb125Fd125, GFSK_Rb2Fd5, GFSK_Rb2_4Fd36, GFSK_Rb4_8Fd45, GFSK_Rb9_6Fd45, GFSK_Rb19_2Fd9_6, GFSK_Rb38_4Fd19_6, GFSK_Rb57_6Fd28_8, GFSK_Rb125Fd125, OOK_Rb1_2Bw75, OOK_Rb2_4Bw335, OOK_Rb4_8Bw335, OOK_Rb9_6Bw335, OOK_Rb19_2Bw335, OOK_Rb38_4Bw335, OOK_Rb40Bw335 }

Detailed Description

Data Structures

Public Types

Public Member Functions

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Member Enumeration Documentation

Constructor & Destructor Documentation

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