Rainbow Electronics ATmega128RFA1 - Manual (Page 97)

97
8266A-MCU Wireless-12/09
ATmega128RFA1
The transmission is started by enabling the PLL (TRX_CMD = PLL_ON) and writing the
TX_START command to register TRX_STATE.
Even for CW signal transmission it is required to write valid PSDU data to the Frame
Buffer. For PRBS mode it is recommended to write a frame of maximum length.
The detailed programming sequence is shown in Table 9-26 below . The column R/W
informs about writing (W) or reading (R) a register or the Frame Buffer.
Table 9-26. Continuous Transmission Programming Sequence
Step Action Register R/
W Value Description
1 RESET Reset the transceiver
2 Register Access IRQ_MASK W 0x01 Set IRQ mask register, enable
PLL_LOCK interrupt and set
global AVR IRQ enable
3 Register Access TRX_CTRL_1 W 0x00 Disable TX_AUTO_CRC_ON
4 Register Access TRX_STATE W 0x03 Set radio transceiver state
TRX_OFF
5 Register Access PHY_CC_CCA W 0x33 Set IEEE 802.15.4 CHANNEL,
e.g. 19
6 Register Access PHY_TX_PWR W 0x00 Set TX output power, e.g. to P
max
7 Register Access TRX_STATUS R 0x08 Verify TRX_OFF state
8 Register Access TST_CTRL_DIGI W 0x0F Enable Continuous Transmission
Test Mode – step # 1
9 (1) Register Access TRX_CTRL_2 W 0x03 Enable High Data Rate Mode, 2
Mb/s
10
(1)
Register Access RX_CTRL W 0xA7 Configure High Data Rate Mode
11
(2)
Frame Buffer
Write Access W Write PSDU data (even for CW
mode), refer to
Table 9-27 on
page 98
12 Register Access PART_NUM W 0x54 Enable Continuous Transmission
Test Mode – step # 2
13 Register Access PART_NUM W 0x46 Enable Continuous Transmission
Test Mode – step # 3
14 Register Access TRX_STATE W 0x09 Enable PLL_ON state
15 Interrupt event R 0x01 Wait for PLL_LOCK interrupt
16 Register Access TRX_STATE W 0x02 Initiate Transmission,
enter BUSY_TX state
17 Measurement Perform measurement
18 Register Access TRX_CTRL_2 W 0x00 Disable Continuous
Transmission Test Mode
19 RESET Reset the transceiver
Notes: 1. Only required for CW mode, do not configure for PRBS mode.
2. Frame Buffer content varies for different modulation schemes.
The content of the Frame Buffer has to be defined for Continuous Transmission PRBS
mode or CW mode. To measure the power spectral density (PSD) mask of the
transmitter it is recommended to use a random sequence of maximum length for the
PSDU data.