CC1150-RTY1 datasheet(21/67 Pages) TI1

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CC1150

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SWRS037B – JANUARY 2006 – REVISED MARCH 2015

The preamble pattern is an alternating sequence of ones and zeros (01010101…). The number of

preamble bytes is programmed with the MDMCFG1.NUM_PREAMBLE value. When enabling TX, the

modulator will start transmitting the preamble. When the programmed number of preamble bytes has been

transmitted, the modulator will send the sync word and then data from the TX FIFO if data is available. If

the TX FIFO is empty, the modulator will continue to send preamble bytes until the first byte is written to

the TX FIFO. The modulator will then send the sync word and then the data bytes.

The synchronization word is a two-byte value set in the SYNC1 and SYNC0 registers. The sync word

provides byte synchronization of the incoming packet. A one-byte synch word can be emulated by setting

the SYNC1 value to the preamble pattern. It is also possible to emulate a 32 bit sync word by using

MDMCFG2.SYNC_MODE set to 3 or 7. The sync word will then be repeated twice.

C1150 supports both fixed packet length protocols and variable packet length protocols. Variable or fixed

packet length mode can be used for packets up to 255 bytes. For longer packets, infinite packet length

mode must be used.

Fixed packet length mode is selected by setting PKTCTRL0.LENGTH_CONFIG=0. The desired packet

length is set by the PKTLEN register. In variable packet length mode PKTCTRL0.LENGTH_CONFIG=1,

the packet length is configured by the first byte after the sync word. The packet length is defined as the

payload data, excluding the length byte and the optional automatic CRC.

With PKTCTRL0.LENGTH_CONFIG=2, the packet length is set to infinite and transmission will continue

until turned off manually. The infinite mode can be turned off while a packet is being transmitted. As

described in Section 5.8.2.1, this can be used to support packet formats with different length configuration

than natively supported by CC1150. One should make sure that TX mode is not turned off during the

transmission of the first half of any byte. Refer to the CC1150 Errata Notes [8] for more details.

NOTE

The minimum packet length supported (excluding the optional length byte and CRC) is one

byte of payload data.

5.8.2.1

Arbitrary Length Field Configuration

The packet automation control register, PKTCTRL0, can be reprogrammed during TX. This opens the

possibility to transmit packets that are longer than 256 bytes and still be able to use the packet handling

hardware support. At the start of the packet, the infinite mode (PKTCTRL0.LENGTH_CONFIG=2) must be

active. The PKTLEN register is set to mod(length, 256). When less than 256 bytes remains of the packet,

the MCU disables infinite packet length and activates fixed length packets. When the internal byte counter

reaches the PKTLEN value, the transmission ends (the radio enters the state determined by

TXOFF_MODE). Automatic CRC appending can be used (by setting PKTCTRL0.CRC_EN=1).

When, for example, a 600-byte packet is to be transmitted, the MCU should do the following (see also

Figure 5-9):

•

Set PKTCTRL0.LENGTH_CONFIG=2.

•

Pre-program the PKTLEN register to mod(600,256)=88.

•

Transmit at least 345 bytes, for example by filling the 64-byte TX FIFO six times (384 bytes

transmitted).

•

Set PKTCTRL0.LENGTH_CONFIG=0.

•

The transmission ends when the packet counter reaches 88. A total of 600 bytes are transmitted.

Detailed Description

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