How can I control RF switches of FMCOMMS5 in Python?

Hi,

One option would be to use https://github.com/analogdevicesinc/linux/blob/master/drivers/iio/addac/one-bit-adc-dac.c (https://github.com/analogdevicesinc/linux/blob/master/Documentation/devicetree/bindings/iio/addac/one-bit-adc-dac.yaml ) to control those GPIOs - the device will be accessible through libiio, so implicitly through pyadi-iio.

Thanks,
Dragos

With pyadi it would be:

sdr = adi.FMComms5()

sdr._ctrl.debug_attrs['calibration_switch_control'].value = str(<switch value>)

-Travis

Thank you for your support.

I used pyadi.
There are two switches CAL_SW_1 and CAL_SW_2 and you suggested one command only.
I read this link:
wiki.analog.com/.../multi-chip-sync

I understood that:
Device A (Tx1B) will route to Device A (Rx1C) and Device B (Rx1C)
or
Device B (Tx1B) will route to Device A (Rx1C) Device B (Rx1C)
What is the <switch value> in both cases?

FMComms5 has two AD9361, and I have to change SPI Register(0x004—Input Select)
during multi-chip-sync to select TxB and enable RxC for both chips as follows:
sdr._ctrl.reg_write(0x004, 0x70)
Is this correct. Does this command work for both chip & chip_b at the same time?
I am trying to do multi-chip-sync. Do you have Python example?

Please help. Thank you very much.

There is a library function that pretty much does this: https://github.com/analogdevicesinc/libad9361-iio/blob/master/ad9361_fmcomms5_phase_sync.c#L577

You could either try to call into this library or just copy the algorithm.

-Travis

I know ad9361_fmcomms5_phase_sync.c

But, I prefer Python.

I understood that:
Device A (Tx1B) will route to Device A (Rx1C) and Device B (Rx1C)
or
Device B (Tx1B) will route to Device A (Rx1C) Device B (Rx1C)

sdr._ctrl.debug_attrs['calibration_switch_control'].value = str(<switch value>)
What is the <switch value> in both cases?

FMComms5 has two AD9361, and I have to change SPI Register(0x004—Input Select)
during multi-chip-sync to select TxB and enable RxC for both chips as follows:
sdr._ctrl.reg_write(0x004, 0x70)
Is this correct. Does this command work for both chip & chip_b at the same time?

Thank you.

I know ad9361_fmcomms5_phase_sync.c

But, I prefer Python.

I understood that:
Device A (Tx1B) will route to Device A (Rx1C) and Device B (Rx1C)
or
Device B (Tx1B) will route to Device A (Rx1C) Device B (Rx1C)

sdr._ctrl.debug_attrs['calibration_switch_control'].value = str(<switch value>)
What is the <switch value> in both cases?

FMComms5 has two AD9361, and I have to change SPI Register(0x004—Input Select)
during multi-chip-sync to select TxB and enable RxC for both chips as follows:
sdr._ctrl.reg_write(0x004, 0x70)
Is this correct. Does this command work for both chip & chip_b at the same time?

Thank you.

Please look at the source of that function, it shows you exactly what to do: https://github.com/analogdevicesinc/libad9361-iio/blob/master/ad9361_fmcomms5_phase_sync.c#L163

Please use the IIO attributes to change the ports as we do not support register control of AD9361. You are on your own if you do.

Changing the ports is done by:

# Chip A

sdr._ctrl.find_channel("voltage0").attrs['rf_port_select'].value = "<Port name>"

# Chip B

sdr._ctrl_b.find_channel("voltage0").attrs['rf_port_select'].value = "<Port name>"

-travis

You advised me to use:
# Chip A

sdr._ctrl.find_channel("voltage0").attrs['rf_port_select'].value = "<Port name>"

# Chip B
sdr._ctrl_b.find_channel("voltage0").attrs['rf_port_select'].value = "<Port name>"

Do you mean that <Port name> has the following values?
A, A_BALANCED, B, B_BALANCED, C, C_BALANCED etc.

In your first answer, you advised me to use:
sdr._ctrl.debug_attrs['calibration_switch_control'].value = str(<switch value>)
What are the values of <switch value> to control both switches (two ADG918 on FMCOMMS5) at the same time?

Thank you,

SDR_lover said:

Do you mean that <Port name> has the following values?
A, A_BALANCED, B, B_BALANCED, C, C_BALANCED etc.

Yes.

SDR_lover said:

In your first answer, you advised me to use:
sdr._ctrl.debug_attrs['calibration_switch_control'].value = str(<switch value>)
What are the values of <switch value> to control both switches (two ADG918 on FMCOMMS5) at the same time?

The switch control will take the first two bits of the input provided to signify switch 1 and switch 2 state: https://github.com/analogdevicesinc/linux/blob/d7c0f7cad3280fdcff25a20443ad82487f2d3921/drivers/iio/adc/ad9361.c#L8267

-Travis

travisfcollins said:

The switch control will take the first two bits of the input provided to signify switch 1 and switch 2 state: https://github.com/analogdevicesinc/linux/blob/d7c0f7cad3280fdcff25a20443ad82487f2d3921/drivers/iio/adc/ad9361.c#L8267

sdr._ctrl.debug_attrs['calibration_switch_control'].value = str(<switch value>)

Does it mean that <switch value> has the value of 12 or 34 (decimal) according to this link?

wiki.analog.com/.../multi-chip-sync

travisfcollins said:

Do you mean that <Port name> has the following values?
A, A_BALANCED, B, B_BALANCED, C, C_BALANCED etc

How can I select the Tx output (RF output ports) A and B (TxA and TXB)?