LAUNCHXL-F28379D: Implementation of ADC Early sampling with CLA

Anurag Singh

Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: C2000WARE

Hi,

My project involves implementation of a hysteresis controller fro Buck Converter. The problem involves not to use CMPSS but ADCs for this task and achieve high switching frequency.

As I understand CLA can help in that process. There are three steps in achieving the objective -

Get the ADC results fetched inside the CLA (as soon as the conversion is complete).
Executing of some control operations for hysteresis comparisons.
Toggling of GPIO pins which act as gating signals for the buck converter.

The most time critical component seems to be first one which is just in time sampling. Is there any special thing that needs to be done to accomplish the early sampling? Any help is appreciated.

over 2 years ago

0 Veena Kamath over 2 years ago

TI__Mastermind 32425 points

Have you looked at the example cla_ex5_adc_just_in_time available on C2000ware?

Unfortunately, this example is not included in the F2837x driverlib, but is available for other devices. You can use that as a reference

Regards,

Veena

0 Anurag Singh over 2 years ago in reply to Veena Kamath

Prodigy 95 points

Is the function - ADC_setInterruptCycleOffset not available in F28379D?

I couldn't find it in the adc.h header file.

0 Meghavi Tank over 1 year ago in reply to Anurag Singh

TI__Intellectual 1050 points

Hi Anurag,

No, the ADC_setInterruptCycleOffset is not available for F28379D device. You can either generate an interrupt at the end of acquisition window or at the end of voltage conversion.

Regards,

Meghavi

0 Anurag Singh over 1 year ago in reply to Meghavi Tank

Prodigy 95 points

Hi,

The only option then I have is to generate ADC interrupt at the end of conversion because conversion takes around 10.5 ADCCLK cycles which is 42 SYSCLKS with clk divider of 4. I wont be able to align my result fetch code in CLA with new ADC results.

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LAUNCHXL-F28379D: Implementation of ADC Early sampling with CLA