Switching Antennas

[Siddharth Venkatesh]

Hi 

This is my code for antenna switching. I've got 8 antennas I want to switch between. 

NRF_RADIO->PSEL.DFEGPIO[0] = 0x00000011; //(P0.17)
NRF_RADIO->PSEL.DFEGPIO[1] = 0x00000013; //(P0.19)
NRF_RADIO->PSEL.DFEGPIO[2] = 0x00000014; //(P0.20)
NRF_RADIO->SWITCHPATTERN = 0x0; // before CTE - antenna 1
NRF_RADIO->SWITCHPATTERN = 0x0; // reference - antenna 1
NRF_RADIO->SWITCHPATTERN = 0x1;
NRF_RADIO->SWITCHPATTERN = 0x2;
NRF_RADIO->SWITCHPATTERN = 0x3;
NRF_RADIO->SWITCHPATTERN = 0x4;
NRF_RADIO->SWITCHPATTERN = 0x5;
NRF_RADIO->SWITCHPATTERN = 0x6;
NRF_RADIO->SWITCHPATTERN = 0x7;

I was just wondering if I have mapped the PSEL.DFEGPIO pins correctly and if i can use the pins 0.17, 0.19 and 0.20 on the nRF52833 DK. 

Also if I have done the right switch pattern for 8 antennas. 

Thanks

[Dmitry]

Hi,

what RF switch IC do you have? It's hard to say whether your config is right without looking at schematics.

Antenna 1 is not used in switching sequence, only for reference period - is it your intention?

P0.19 is marked as "Standard drive, low frequency I/O only", it's better to choose another one.

[Siddharth Venkatesh]

Hi 

I am using the EV1HMC321ALP4E eval board. 

Also what other pins would you suggest. 

I was thinking of using 1.08 and 1.07, but I am not sure about their hexadecimal values. 

Thanks

[Dmitry]

Hi,

Siddharth Venkatesh said:

I am using the EV1HMC321ALP4E eval board. 

Yes, config is right. It's safer to add RADIO->CLEARPATTERN=1 before configuring pattern.

Siddharth Venkatesh said:

Also what other pins would you suggest. 

Look at "Pin assignment" section in product spec, you can choose any pin where "recommended usage" is not "Standard drive, low frequency I/O only".

Siddharth Venkatesh said:

I was thinking of using 1.08 and 1.07, but I am not sure about their hexadecimal values

They're mapped to 0x28 and 0x27, but why do you need "magic" numbers? Use NRF_GPIO_PIN_MAP(1, 8).