Physical Layer Mode

The radio transceiver supports BPSK and O-QPSK modulation at different data rates, described in section 7.1 (Physical Layer Modes) and table 7-5 (Register 0x0C (TRX_CTRL_2) Bit Alignment) of the AT86RF212 datasheet.

Note:

In order to change the physical layer mode, the radio transceiver has to be in state TRX_OFF (see also section Transitions to State TRX_OFF).

Parameters:

	useoqpsk	values {0,1}, see table below.
	submode	values {0,1}, see table below.
	oqpskrate	values {0,1,2}, see table below.
	scramen	scrambler configuration for O-QPSK_{400,1000}; values { 0: disabled, 1: enabled (default)}.
	rcen	transmit signal pulse shaping for O-QPSK_{250,500,1000}; values {0 : half-sine filtering (default), 1 : RC-0.8 filtering}.
	gctxoffset	offset value for the TX output power. Since this transmit power configuration parameter depends on the selected modulation, it is set in this sequence to the values {3} for BPSK and {2} for O-QPSK. For more details refer to table 7-16 (Mode-dependent setting of GC_TX_OFFS) in the AT86RF212 datasheet.

Note:

The parameters scramen and rcen shall be set according to table 7-5 (Register 0x0C (TRX_CTRL_2) Bit Alignment) of the AT86RF212 datasheet in order to configure standard compliant modes.

Combinations of PHY Layer Mode Parameters

(see also table 7-5 (Register 0x0C (TRX_CTRL_2) Bit Alignment) of the AT86RF212 datasheet)

Mode	useoqpsk	submode	oqpskrate
BPSK_20	0	0	X
BPSK_40	0	1	X
O-QPSK_100	1	0	0
O-QPSK_200	1	0	1
O-QPSK_400	1	0	2
O-QPSK_250	1	1	0
O-QPSK_500	1	1	1
O-QPSK_1000	1	1	2

Use Cases:

• SET_PHY_MODE
• GET_PHY_MODE
• see also SET_HRM_MODE and GET_HRM_MODE

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SET_PHY_MODE

The modulation and PSDU data rate of the radio transceiver can be set using the following sequence.

Code example

    /* AT86RF212::TRX_OFF */
    trx_bit_write(SR_BPSK_OQPSK, useoqpsk);
    trx_bit_write(SR_SUB_MODE, submode);
    trx_bit_write(SR_OQPSK_DATA_RATE, oqpskrate);
    trx_bit_write(SR_OQPSK_SCRAM_EN, scramen);
    trx_bit_write(SR_OQPSK_SUB1_RC_EN, rcen);
    trx_bit_write(SR_GC_TX_OFFS, gctxoffset);

GET_PHY_MODE

Code example

    /* AT86RF212::[ACTIVE] */
    useoqpsk = trx_bit_read(SR_BPSK_OQPSK);
    submode = trx_bit_read(SR_SUB_MODE);
    oqpskrate = trx_bit_read(SR_OQPSK_DATA_RATE);
    scramen = trx_bit_read(SR_OQPSK_SCRAM_EN);
    rcen = trx_bit_read(SR_OQPSK_SUB1_RC_EN);
    gctxoffset = trx_bit_read(SR_GC_TX_OFFS);