4432-T-B1 B 915【PDF 43/47 页】KIT DEV TEST EZRADIOPRO SI4432

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Si4430/31/32-B1

Rev 1.1

6.3. Packet Handler TX Mode

If the TX packet length is set the packet handler will send the number of bytes in the packet length field before

returning to IDLE mode and asserting the packet sent interrupt. To resume sending data from the FIFO the

microcontroller needs to command the chip to re-enter TX mode. Figure 19 provides an example transaction where

the packet length is set to three bytes.

Figure 19. Multiple Packets in TX Packet Handler

6.4. Packet Handler RX Mode

6.4.1. Packet Handler Disabled

When the packet handler is disabled certain fields in the received packet are still required. Proper modem

operation requires preamble and sync when the FIFO is being used, as shown in Figure 20. Bits after sync will be

treated as raw data with no qualification. This mode allows for the creation of a custom packet handler when the

automatic qualification parameters are not sufficient. Manchester encoding is supported but data whitening, CRC,

and header checks are not.

Figure 20. Required RX Packet Structure with Packet Handler Disabled

6.4.2. Packet Handler Enabled

When the packet handler is enabled, all the fields of the packet structure need to be configured. Register contents

are used to construct the header field and length information encoded into the transmitted packet when

transmitting. The receive FIFO can be configured to handle packets of fixed or variable length with or without a

header. If multiple packets are desired to be stored in the FIFO, then there are options available for the different

fields that will be stored into the FIFO. Figure 21 demonstrates the options and settings available when multiple

packets are enabled. Figure 22 demonstrates the operation of fixed packet length and correct/incorrect packets.

Figure 21. Multiple Packets in RX Packet Handler

ata 1

ata 2

ata 3

ata 4

ata 5

ata 6

ata 7

ata 8

ata 9

}

This will be sent in the first transmission

This will be sent in the second transmission

This will be sent in the third transmission

Preamble

SYNC

DATA

Data

FIFO

Data

Header(s)

Length

rx_multi_pk_en = 1

Data

rx_multi_pk_en = 0

txhdlen = 0

txhdlen > 0

fixpklen

0 1

Data

RX FIFO Contents:

Transmission:

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