MSPM0G3507: ADC Conversion Not Synchronizing with PWM (MSPM0G3507)

Part Number: MSPM0G3507
Other Parts Discussed in Thread: SYSCONFIG

Hi Team,

I am working on the MSPM0G3507 MCU and trying to synchronize ADC conversion with a PWM signal.

My requirement is as follows:

• PWM frequency: 100 kHz

• I need to sample 10 ADC values within one PWM cycle

• This means I need 1 ADC conversion every 1 µs

• All samples must be synchronized to the PWM cycle (same phase every cycle)

What I have tried:

• Configured PWM as event publisher

• Configured Timer as subscriber to PWM

• Configured Timer as publisher

• Configured ADC as subscriber to Timer

So the chain is:

PWM → Timer → ADC

Issues:

1. ADC conversions are not properly synchronized with PWM

   • Samples are drifting across multiple PWM cycles, or

   • Not restarting correctly on every PWM edge

   • I am not getting consistent 10 samples within a single PWM period

2. I am also unable to set PWM duty cycle to exactly 50% at 100 kHz frequency

Expectation:

• On every PWM edge:

  • Timer should start/reset

  • ADC should take exactly 10 samples at 1 µs intervals

  • Sampling should repeat identically every PWM cycle

Questions:

1. What is the correct configuration to achieve this synchronization?

2. Why might PWM duty cycle not be achieving an exact 50% at 100 kHz?

Any example configuration or reference project would be very helpful.

Thanks in advance!

Best regards,