I am using the internal oscillator with the KV31F512 Processor.
Our application is a Brushless DC motor controller. (phase u Hi, low, phase v hi, low and phase w hi and low)
I was given a board design that already existed but was never tested.
All 3 of the lo phases are just on and off, All 3 of the hi phases are gated PWM's
Phase U is PortA13 FTM1-CH1
Phase V is PortE25 FTM0-CH1
Phase W is PortE6 FTM3-CH1
Using the FRDM-kv31f and subbing PortC2 for PortE25 The software runs and i get the expected signals.
Our Target board however does not an external crystal and we must use the internal oscillator.
I have an UART2 working at 115200 without issue.
I have a timer running to control the start/stop of the 3 phases.
PhaseW does not work.
Further testing has found that if i comment out code for Phase U and Phase V, and only have Phase W enabled, I get pulses on Phase U.
Since this worked on the FRDM-KV31F board and not our target I am wondering if there is some interaction i am unaware of when using the internal oscillator.
If you need to I can send code snippets to show what i am doing.
I know the preferred method is to use ONE FTM for a motor but the layout was already done.
Thanks in advance.
Peter Hedlund
