Recently I have bought SPIN3202 board and used for bldc controller with 6-step commutation method, but i have some question

Hi, Dear @Laurent Ca...​ , I have the following questiones: for six-step commutation with sixsteplib , I'm suffering from some problems when translating to F429：

1. the TIM1 output pulse is non-uniform when output with high duty cycle 4500 , TIM1’ period 5500. but the pulse is normal when duty cycle below 4000's ; reference @pic.1 for high duty cycle and pic.2 low's.
2. ​ the TIM1 three upper channels' output pulse is strange: CH1 's PWM is incoherent and do not output pulses even its CCR registers have been written right.
3. ​ TIM1 CH2 and CH3's cannot be stop when motor speed is high, however its CCR can be write to 0 to output CHxN's high level pulse. As a result, TWO upper channels will be opened simultaneously and wrongly, ref. at PIC.3 . all of this is OK for low speed at pic. 2.

​the hall signals are well and commutate right when running at low and high speed.

can you tell me why TIM1' PWM channels is out of control when motor working in high speed?

​

thank you.pic1

pic.2pic.3