CC112x fast RX/TX switching: howto ?

GGA

Hello,

optimizing our circuit I'm trying to get down switching time from e.g. TX to RX.
Usually I issue an IDLE strobe command, followed by SRX. But if I don't put a 2 ms delay in between, RX mode doesn't come up again (current remains as in Idle mode).

So today my switching time is 2.5ms, which is much to high. As remark: SPI is done 'by hand' with just port pins I/O, not usiang a uC build in SPI).
What might be wrong, what's typical?

Thx.

over 12 years ago

0 Sverre over 12 years ago

TI__Mastermind 39860 points

You find the RX/TX switching times in the data sheet. See "Wake Up and Timing" section

0 GGA over 12 years ago in reply to Sverre

Genius 3985 points

I know about the timing specs, which are far below of what I have today.
But: working in transparent mode, do I need to IDLE before switching RX <-> TX ?

0 Sverre over 12 years ago in reply to GGA

TI__Mastermind 39860 points

You can strobe TX (RX) wile in RX (TX). No need to go through IDLE

0 GGA over 12 years ago in reply to Sverre

Genius 3985 points

Now I change direct from TX to RX without IDLE.

But it still takesl 2ms until I have a valid output signal (see curve, where the blue line is a port pin set after issuing SRX to CC11xx and the red one is the output signal. CC is receiving a 2kHz sample rectangle from generator).

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CC112x fast RX/TX switching: howto ?