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SX1210
ADVANCED COMMUNICATIONS & SENSING
5.5.8. Packet Mode Example
Configure all data processing related registers listed below appropriately. In this example we assume CRC is
enabled with autoclear on.
Table 20: Relevant Configuration Registers in Packet Mode (data processing related only)
Description
Data_mode_x
Defines data operation mode ( Packet)
MCParam
IRQParam
RXParam
SYNCParam
PKTParam
Fifo_size
Fifo_thresh
Rx_stby_irq_0
Rx_stby_irq_1
Sync_size
Sync_tol
Sync_value
Manchester_on
Payload_length
Node_adrs
Pkt_format
Whitening_on
CRC_on
Adrs_filt
CRC_autoclr
Defines FIFO size
Defines FIFO threshold
Defines IRQ_0 source in Rx & Stby modes
Defines IRQ_1 source in Rx & Stby modes
Defines Sync word size
Defines the error tolerance on Sync word detection
Defines Sync word value
Enables Manchester decoding
Length in fixed format, max length in variable format
Defines node address for address filtering
Defines packet format (fixed or variable length)
Enables de-whitening process
Enables CRC calculation/check
Enables and defines address filtering
Enables FIFO autoclear if CRC failed
Rx Mode :
Program Rx/Stby interrupts: IRQ_0 mapped to /Fifoempty (Rx_stby_irq_0=10) and IRQ_1 mapped to CRC_OK
(Rx_stby_irq_1=00)
Go to Rx (note that Rx is not ready immediately, see section 7.3.1
Wait for CRC_OK interrupt
Go to Stby
Read payload bytes from FIFO until /Fifoempty goes low.
Go to Sleep mode
5.5.9. Additional Information
It is not possible to receive multiple packets. Once a packet has been received and filled into the FIFO all its
content needs to be read i.e. the FIFO must be empty for a new packet reception to be initiated.
The Payload_ready interrupt goes high when the last payload byte is available in the FIFO and remains high until
all its data are read. Similar behavior is applicable to Adrs_match and CRC_OK interrupts.
The CRC result is available in the CRC_status bit as soon as the CRC_successful and Payload_ready interrupt
sources are triggered. In Rx mode, CRC_status is cleared when the complete payload has been read from the
FIFO. If the payload is read in Stby mode, then CRC_status is cleared when the user goes back to Rx mode and a
new Sync word is detected.
The Fifo_fill_method and Fifo_fill bits don’t have any meaning in the Packet mode and should be set to their default
values only.
Rev 2– Sept 8 , 2008
th
Page 48 of 73
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