IWR1443: Max ADC samples

Akshay Patel1

Intellectual 690 points

Part Number: IWR1443
Other Parts Discussed in Thread: IWR1642

Hi,

What is the maximum number of ADC samples that I can get from IWR1443 in one chirp.

Can i use whole 64k memory of HWA for ADC samples.

Regards,

over 5 years ago

0 Akash Gondalia over 5 years ago

TI__Guru 50240 points

Hi Akshay,

I've asked an expert to look into this.

Cheers,

Akash

0 Nitin Sakhuja over 5 years ago in reply to Akash Gondalia

TI__Mastermind 30405 points

Hi Akshay,

Please refer to the following thread and substitute 16KB for the ADC data buffer size (instead of 32KB for IWR1642/6843).

IWR6843ISK-ODS: profileCfg parameters

Please understand this calculation and let us know if you have more questions.

Regards

-Nitin

0 Akshay Patel1 over 5 years ago in reply to Nitin Sakhuja

Intellectual 690 points

Hi Nitin,

I checked calculations and got following result with 16KB ADC buffer size.

MAX_NUM_SAMPLES = 16KB / (1 RX channels x 4 byte per sample) = 4096.

There is total of 32KB ADC buffer size (correct me if wrong) in IWR1443 (16KB each for ping and pong). Can I use whole 32 KB memory to store ADC samples for one chirp.

Also in SWRU526B (Radar Hardware Accelerator User guide) page 14, it is mentioned that the accelerator local memories do not necessarily need to be used in ping-pong mode and can instead be used as larger 32KB input and output memories, if the use case requires.

Thanks,

Akshay

0 Nitin Sakhuja over 5 years ago in reply to Akshay Patel1

TI__Mastermind 30405 points

The hardware buffer is 32KB but the application sees 16KB as the hardware buffer is divided into 16KB Ping and Pong each. The switch between ping / pong is transparent to the application as it always accesses the 16 KB ADC buffer at the same address. When the application is accessing Ping, the DFE is writing to Pong and vice-versa.

0 Akshay Patel1 over 5 years ago in reply to Nitin Sakhuja

Intellectual 690 points

Ping-Pong switch changes after chirp ends, so max ADC buffer size for one chirp will be 16 KB. It will not be possible to use 32 KB buffer in single chirp.

Thanks,

Akshay

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IWR1443: Max ADC samples