TMS320F280025C: Universal Motor lab

Jagbir

Part Number: TMS320F280025C
Other Parts Discussed in Thread: TMS320F28379S, C2000WARE

Hi,

I am porting the code using the section of the lab guide for my custom baord with DrV8323rs and Tms320f28379s.

I am using different ADC pins and ports for my board as shown below.

The lab source code uses ADC C for configuring the interrupts for the ADC as well as PIE since the Isense and Vmotor inputs are on the same ADC channel.

//#define MTR1_ADC_INT_BASE ADCC_BASE // ADCC-C6 -SOC

//#define MTR1_PIE_INT_NUM INT_ADCC1 // ADCC_INT1-SOC6

My motor voltage is on ADC channel D, but my Isense pins are on ADC channel A. Which ADC channel do I use for configuring interrupts, channel A or channelD.

over 1 year ago

0 Yanming Luo over 1 year ago

TI__Guru** 109810 points

Since there are 3 SOCs on ADCA, and is only one on ADCD, you may configure the interrupt for ADCA. You should configure the interrupt to use the maximum using SOC number of ADC module, to ensure that the all of the used ADC channels sampling are compeleted when the interrupt is triggered.

0 Jagbir over 1 year ago in reply to Yanming Luo

Expert 1515 points

If I configure the interrupt for ADCA then I can not read ADC D(Vmotor) value. What could be the reason.

0 Yanming Luo over 1 year ago in reply to Jagbir

TI__Guru** 109810 points

It's not related to the interrupt configuration. It could be that the ADC channel is not assigned or triggered correctly for Vmotor.

0 Jagbir over 1 year ago in reply to Yanming Luo

Expert 1515 points

Hi Yanming,

I was able to read the Vdcbus value. However, I am getting offset on CSA SOx pins. The expected value is ~ 2000 counts (1.65V) but I measure ~2400 counts (1.9V).

Thanks,

Jagbir

0 Yanming Luo over 1 year ago in reply to Jagbir

TI__Guru** 109810 points

You can use a mulitmeter to measure the voltage on this ADC pin, and then check if the ADC result is correct.

Please be noted that the ADC reference voltage of the Tms320f28379s is the same as F280025C. You may refer to the ADC examples in C2000Ware to change the ADC configuration for Tms320f28379s.

0 Jagbir over 1 year ago in reply to Yanming Luo

Expert 1515 points

The ADC results reflect the measured pin value correctly. The SOx pin on the DRV has an offset of 1.9V instead of 1.65V, causing this offset.

I have another question about the lab. I am measuring unusually high current(~40A) values while driving the motor. The nominal current for my motor is 7A and the stall current is 150A.

0 Yanming Luo over 1 year ago in reply to Jagbir

TI__Guru** 109810 points

Try to run the lab in build level 2 and 3 first, make sure that the ADC and PWM are configured correctly, and the hardware parameteres are set correctly as well.

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TMS320F280025C: Universal Motor lab