AWR1642: Does Capture demo support minus FM slope rate?

juan cai

Part Number: AWR1642

I want to generate a triangle-like wave form in Capture demo of AWR1642.

So I did a test by changing the radar config script like this:

flushCfg
dfeDataOutputMode 1
channelCfg 2 1 0
adcCfg 2 1
adcbufCfg 0 0 1 1
profileCfg 0 79 20 5 80 0 0 -40 1 256 8000 0 0 30
chirpCfg 0 0 0 0 0 0 0 1
frameCfg 0 0 128 1 20 1 0
lowPower 0 0
sensorStart

The numbers marked in red is different from script in User Guide.

However there is no object can be observed in captured ADC data.

When I changed the script of profile config back to "profileCfg 0 77 20 5 80 0 0 40 1 256 8000 0 0 30", it worked well.

I noticed that the PF_FREQ_SLOPE_CONST can be set between -2072 to 2072 kHz/us in "AWR1xx_Radar_Interface_Control.pdf".

Does Capture demo support minus FM slope rate?

Thank you.

over 8 years ago

0 Vivek Dham over 8 years ago

TI__Guru 58035 points

Hello Juan,
The present capture demo application does not support negative slopes, we would be enabling this in the next release. But you can easily modify the code to enable negative slops.
In the "Cli_mwave.c" file the typ def of the slope const is kept as unit32 and hence only positive values are taken at present. If you change the type def to int then negative slop would also work.

profileCfg.freqSlopeConst = (uint32_t)(atof (argv[8]) * (1U << 26) / (3.6*1e3*900)); //2^26 * 1e6/((3.6*1e9)*900)

Regards,
Vivek

0 juan cai over 8 years ago in reply to Vivek Dham

Prodigy 195 points

Hi Vivek
Thanks a lot for your help.
I would try your advice.
Regards,
Caijuan

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AWR1642: Does Capture demo support minus FM slope rate?