to prevent data reception during cca, follow the procedure shown below at the time of initial setting. [procedure] (1) setting to prevent bit synchronization from being established during cca bank3: 0x2d = 0x01 (default: 0x00) *there is no need to dynamically switch the setting according to cca.
to prevent data reception during cca, follow the steps shown below. to restore data reception after cca, be sure to return to the original setting before reception. [procedure] (1) setting to prevent bit synchronization from being established bank1: 0x5c = 0x00 bank3: 0x03 = 0x00 (2) cca started (3) waiting for cca completion (4) after completion of cca, trx_off (1) setting to establish bit synchronization bank1: 0x5c = original value bank3: 0x03 = original value
to prevent data reception during cca, follow the steps shown below. to restore data reception after cca, be sure to return to the original setting before reception. [procedure] (1) setting to prevent bit synchronization from being established bank2: 0x03 = 0x00 bank2: 0x0e = 0x00 (2) cca started (3) waiting for cca completion (4) after completion of cca, trx_off (1) setting to establish bit synchronization bank2: 0x03 = original value bank2: 0x0e = original value
to adjust the transmission power in tx_on state, set pa_reg_adj_sel ([pa_reg_adj: b0 0x67 (7)]) = 1. other than transmission power adjustment, set pa_reg_adj_sel = 0. for details, refer to the data sheet "lsi adjustment items and adjustment methods"-"pa adjustment".
when the following dio mode is used, it is recognized that reception is in progress, so the action will continue even if the trx_off instruction is executed. therefore, in this mode, use the force_trx_off instruction to switch the state to trx_off. - constant output mode (rxdio_ctrl = 0b01) "constant reception in progress" is determined. to stop reception, issue the force_trx_off instruction. - data output mode 1 (rxdio_ctrl = 0b10) "reception in progress after detecting syncword" is determined. to stop reception, issue the force_trx_off instruction.
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the receiver changes channels until it receives radio waves from the sender. for this reason, the transmission side must keep sending the preamble until the receiver detects the transmitted channel. therefore, taking into account the number of channels to search for radio waves, a long preamble is required. also, if there is only a radio wave, the receiving side may make an erroneous channel determination based on radio waves from other systems. for this reason, it is necessary to consider the "criterion for presence of radio waves (bit synchronization information, etc.)" that uses signals other than radio waves.
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if data is transmitted simultaneously on the same channel, it may become unable to receive the data due to the rf interference characteristics. however, arib std t-108 requires cca to be performed before transmission. for this reason, there is a mechanism to avoid interference due to simultaneous transmission from nearby transmitters.
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the following two methods can be considered. (1) identifying by changing syncword (when transmitter⇔receiver is one-to-one) the setting can be up to 4byte (2^32) of syncword setting. except patterns with extremely large number of 1's or 0's, it is assumed that approximately 2^24 patterns can be used. (2) managing addresses when one transmitter (master) and multiple receivers (slaves) exist, set the addresses of the slaves. the slave units receive only packets destined to themselves (addresses) (using field check function). addresses can be assigned for up to 2^48-1 units (6 bytes).
after completion of register settings, the control signal is sent to the pa without time lags. therefore, the time taken for them to be reflected is almost equivalent to the response time of pa. since pa provides quick response, they are reflected within 100 us.
