ADAR1000 SPI

Source code emailed.

Please also send me the source code, this would help a lot.

Thanks

Hi, just one question, the code you sent me for the GPIOs...it´s for the interface SDP, right? I want to control the ADAR via SPI and Raspberry Pi...

No, we don't have anything similar in python.

It looks like you could make your own based off of the one done for the AD9850?

Yes, all code including the GPIO control, is to control the SDP.

Yes thank you very much, I think its possible and not difficult to implement it....my only question is, that I dont know how to write the adresses...for example there is the following function to send a byte:

A few things:

• You need to clock in the 16 preceding address bits, so you need to change the range function
• You also need to keep the CSB high, unless you are writing bits to the SPI

So, I think you'd want to change the tfr_byte2() to something like this (changed in bold):

def tfr_byte2(data):

    GPIO.output(CSB, false)  #Pull the CSB low to enable the SPI port
    for i in range (0,24):
        GPIO.output(DATA, data & 0x01)
        pulseHigh(W_CLK)
        data=data>>1
    GPIO.output(CSB, true)  #Pull the CSB high to disable the SPI port

     return

You will need to take care of the CSB-to-GPIO pin number mapping in your code.

Also, in your initialization code of the GPIO lines, you'll want to start the CSB pulled high with:

#Initialization Code

GPIO.output(CSB, true)  #Pull the CSB high to disable the SPI port

No guarantees that this works, but it should give you a pretty good start.  Hope this helps.

A few things:

• You need to clock in the 16 preceding address bits, so you need to change the range function
• You also need to keep the CSB high, unless you are writing bits to the SPI

So, I think you'd want to change the tfr_byte2() to something like this (changed in bold):

def tfr_byte2(data):

    GPIO.output(CSB, false)  #Pull the CSB low to enable the SPI port
    for i in range (0,24):
        GPIO.output(DATA, data & 0x01)
        pulseHigh(W_CLK)
        data=data>>1
    GPIO.output(CSB, true)  #Pull the CSB high to disable the SPI port

     return

You will need to take care of the CSB-to-GPIO pin number mapping in your code.

Also, in your initialization code of the GPIO lines, you'll want to start the CSB pulled high with:

#Initialization Code

GPIO.output(CSB, true)  #Pull the CSB high to disable the SPI port

No guarantees that this works, but it should give you a pretty good start.  Hope this helps.

hi jdobler, I have one question...with the ADAR1000 you also can set up the phase assignment. With the phase assignment you can choose your maxima of azimut and elevation angle...

Could you give me an advice how I can realize an elevation angle of 20 degrees for example with the phase assignment?

Thanks in Advance

This is very system dependent.  I would recommend taking a look at: https://en.wikipedia.org/wiki/Phased_array