CC1101: GDO2 dont work

Javier Vargas Garcia

Part Number: CC1101

Hi,

I am using the chip in asynchronous mode for OOK communication, I need to check that the Carrier Sense signal is ok to avoid erroneous readings when the transmitter is disconnected, until now I was looking at the PKTSTATUS register however I can not do it fast enough. I use GDO0 for the asynchronous signal, and I want to put GDO2 as Carrier Sense but it does not work, if I use GDO0 for Carrier Sense it works but in GDO2 nothing works for me. I have tried reading the value of GDO2 in PKTSTATUS to verify that it is not a digital read failure, but it is always kept at 0.

These are the register for GDOx im using:

SpiWriteReg(CC1101_IOCFG2, 0x0E);
SpiWriteReg(CC1101_IOCFG1, 0x2E);
SpiWriteReg(CC1101_IOCFG0, 0x0D);

I have

Thank you

over 6 years ago

0 Sverre over 6 years ago

TI__Mastermind 39860 points

Did a simple test in our lab where I used the defalt OOK setup in SmartRF Studio to configure the CC1101. Used asynchronous mode. An RF generator was connected to the SMA connector. Selected continuous RX and then pressed "start"
1) IOCFG0 = 0xE. With the generator off the GDO0 signal was low. With the generator on (-50 dBm) the GDO0 signal was high.
2) IOCFG2 = 0xE. With the generator off the GDO0 signal was low. With the generator on (-50 dBm) the GDO0 signal was high.

The measurements show that the CS flag is set correctly on both GDO0 and GDO2. Are you sure the IOCFGx signals are set correctly prior to going to active mode (RX)?

0 Javier Vargas Garcia over 6 years ago in reply to Sverre

Prodigy 110 points

Thank you sverre, I configure them at start, but I dont need to reconfigure them when I go from IDLE or TX to RX or yes? I send the register value at start, GDO2 is the first register I send. I dont know why dont work, in GD0 works properly.

0 Sverre over 6 years ago in reply to Javier Vargas Garcia

TI__Mastermind 39860 points

The chip configuration is done at the start in IDLE mode. This is perfectly fine, and there should be no need to re-write GDO2 when going to RX or TX. As a check, can you read back the register content of IOCFG2 when in RX?

0 Javier Vargas Garcia over 6 years ago in reply to Sverre

Prodigy 110 points

Ill test it and report the result, thanks!

0 Javier Vargas Garcia over 6 years ago in reply to Sverre

Prodigy 110 points

Ok I found the problem, there wasn´t time enought between the reset and setting the register value, I have used a delay and now works great, thank you very much.

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CC1101: GDO2 dont work