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• RF_Init_Service initializes IO lines, set priority of interrupts (only argument to specify
in this function) and programs MICRF506 with default configuration
• RF_RX_Mode and RF_TX_Mode toggles between receive or transmit active modes of the
RF IC
• RF_TX_Power, RF_Powerdown_Mode and RF_Standby_Mode allow power management of
MICRF506
• RF_Set_Local_ID and RF_Set_Local_Address enable changing current default local
parameters (though this is not recommended)
• RF_Get_Sender_Address, RF_Get_Sender_ID and RF_Get_Frame_Type give access to
data extracted after a successful reception
• RF_Get_Buffer_Pointer returns a pointer to access payload with the number of bytes
to read given by RF_Get_Payload_Length
Furthermore, RF_Send_Packet and RF_Receive_Packet are two essential functions to
initiate communication. They are described in next sections.
G.4
T RANSMIT PROCEDURE
To transmit a packet over RF, just call RF_Send_Packet and provide necessary parameters:
• a pointer to the data buffer to be sent
• the number of bytes in this buffer to be sent
• the type of the packet
• the recipient’s address
• last parameter to automatically power down after transmission or not
After all being encoded and put into a buffer, data is sent by activating CN interrupts.
Finally a flag is set to inform user that all data have been sent. A length error code is returned
by RF_Send_Packet if the number of bytes to sent exceeds that defined by frame structure.
G.5
R ECEIVE PROCEDURE
Data can be received simply by calling RF_Receive_Packet. The main problem of a reception
is to know whether there is an incoming signal. This is the role of the RF_CHECK_RSSI option.
If no signal is present, RF_Receive_Packet will be automatically ended. On the other hand,
if the RF_SKIP_RSSI option is used instead and no signal is present, then RF_Receive_Packet
will constantly seek for a SYNC. The only way to force terminating this process is to modify
an argument passed to this function. An example of how to modify this variable is by using a
interrupt source (such a timer period match) that sets the argument to a value different from 0.
As in the transmit packet function, error codes are also output here. Errors include:
90