Component: RF ISM (EB063, MRF49XA) (Wireless)

Author	Matrix Ltd.
Version	2.0
Category	Wireless

RF ISM (EB063, MRF49XA) component

A simple RF-ISM communications module based on the Microchip Alpha MRF49XA device. Also available in the form of the EB063 RF E-block.

Detailed description

No detailed description exists yet for this component

Examples

The example attempts to send and receive data from a remote board. You will need two RF modules to allow the communications to work.

The example can be used to drive both ends of the RF communications as it will send out data but also print out any data received onto the LCD. Pins RA0 and RA1 can be used for diagnostics on the program. RF Example

Downloadable macro reference

	SetSyncPattern
Allows the sync pattern to be modified during runtime to allow for switching between several different RF connections.
- BYTE	Mode
Switches on or off the extended sync functionality
- BYTE	Pattern
The bit pattern used for the standard sync mode
- VOID	Return

	ReceiveByte
Puts the RF module in data mode and attempts to receive a single byte from the RF connection. Only packets containing a single data byte will be accepted.
- BYTE	Timeout
Specifies how many milliseconds to wait for valid data before returning.
- BYTE	Return

	SendString
Puts the RF module in data mode and transmits a packet containing the data string through the RF connection. A packet consists of Sync information, Data and Checksum.
- STRING	Data
- VOID	Return

	TXTune
Used to specify and adjust the RF transmitter properties during runtime.
- BYTE	Deviation
Specifies the transmit FSK frequency deviation - Range 0 - 15
- BYTE	Power
Specifies the transmitter power - Range 0 - 7
- VOID	Return

	RXTune
Used to specify and adjust the RF receiver properties during runtime.
- BYTE	Bandwidth
Specifies the Rx bandwidth - Range 1- 6
- BYTE	Gain
Specifies the Rx gain - Range 0 - 3
- BYTE	Threshold
Specifies the Rx signal to noise threshold - Range 0 - 5
- VOID	Return

	SetBufferData
Allows a value to be loaded into the transmit buffer,
- BYTE	Index
The current location in the transmit buffer starting from 0
- BYTE	Data
The data value to pass
- VOID	Return

	UpdateCenterFrequency
Allows the RF center frequency to be adjusted during runtime to allow multiple RF channels to be scanned or multiplexed.
- UINT	Frequency
Specifies the new center frequency value - Range 96 - 3903
- VOID	Return

	FSKWrite
Writes to the FSK (frequency shift key) data pin.
- BYTE	State
- VOID	Return

	GetDataCount
Returns the number of bytes in the received data buffer.
- BYTE	Return

	SendBuffer
Sends the contents of the transmit buffer.
- BYTE	Count
Specifies how many bytes to transfer from the transmit buffer
- VOID	Return

	SendByte
Puts the RF module in data mode and transmits a packet containing a single data byte through the RF connection. A packet consists of Sync information, Data and Checksum.
- BYTE	Data
- VOID	Return

	ActivateTXMode
Enables the transmitter interface, allowing data to be sent. The receiver interface is automatically disabled.
- VOID	Return

	SetDataRate
Allows the RF data rate to be adjusted during runtime.
- BYTE	Rate
Specifies the new data rate
- VOID	Return

	ActivateRXMode
Enables the receiver interface, allowing data to be received. The transmitter interface is automatically disabled.
- VOID	Return

	FSKRead
Reads the FSK (frequency shift key) data pin.
- BYTE	Return

	ReadRXSignalStrength
Returns the current received signal strength.
- BYTE	Return

	Uninitialise
Powers down the RF module. The module must be re-initialised before it can be used again.
- VOID	Return

	CheckBuffer
Checks for incoming data for a specific period of time. Returns a value greater then 250 to indicate a failure. Returns the length of the incoming data buffer to indicate success.
- BYTE	Timeout
Time to wait before returning no data available
- BYTE	Return

	GetBufferData
Returns a value from the incoming receive data buffer.
- BYTE	Index
Specifies which position in the buffer to read data from
- BYTE	Return

	ReceiveString
Puts the RF module in data mode and attempts to receive a string of bytes from the RF connection.
- BYTE	Length
Specifies the maximum number of bytes to try and receive
- BYTE	Timeout
Specifies how many milliseconds to wait for valid data before returning.
- STRING	Return

	Initialise
Starts up and configures the RF module ready for use. The macro will return a value greater then 0 if the module has been started correctly, otherwise the macro will return a 0.
- BYTE	Return

Property reference

	Properties
	Module Frequency
Module frequency - must be matched with the specific RF transciever being used.
	Center Frequency (96-3903)
Specifies the default RF center frequency
	Center Frequency (MHz)
Calculation to work out the approx actual frequency
	Data Mode
Specifies if the module will send data packets (Byte) or FSK bits (Bit)
	Data Buffer Size (Max)
Maximum number of bytes that can be loaded into a single data packet
	Rate Divider 1
Data rate prescaler 1 - Coarse control
	Rate Divider 2 (0-127)
Data rate prescaler 2 - Fine control
	Max Throughput (Kb/s)
Calculated max data throughput if the data is 100% active
	Data Rate Value
Actual default value passed to the data rate control
	Sync Pattern
Default sync pattern used by the standard sync in byte data mode.
	Extended Sync
Selects if an additional fixed sync byte is to be used.
	Bandwidth
Controls the receiver bandwidth, the higher the value the bigger the datarate that can be acheived but the fewer channels that can co-exist
	Gain
Controls the receiver gain - the amount to amplify the incoming signal before processing
	Threshold
The signal to noise threshold used to control the sensitivity
	Bandwidth
Controls the transmitter bandwidth, i.e. the frequency either side of the center frequency to use for the RF communications
	Power
The amount of power to use when transmitting
	Connections
	Channel
SPI Channel selector
	MOSI
SPI Data Out Pin SDO - Also Known as Master Out Slave In (MOSI) when used in Master mode.
	MISO
SPI Data In Pin SDI - Also Known as Master In Slave Out (MISO) when used in Master mode.
	CLK
SPI Clock Pin CLK - The Clock signal is driven by the SPI master.
	CS / SS
Chip Select / Slave Select Pin Master Mode: General purpose output pin used to select the remote SPI device. Slave Mode: Hardware chip select pin input used to select the SPI device.
	FSEL Pin
RF Mode selection pin
	Simulations
	Label
Label used to help identify the component on the panel.
	Scope Traces
Selects if the scope traces are automatically generated or not
	Console Data
Selects if the console data is automatically generated or not
	API