About MNels.3

MNels.3 · 2021-05-18

I'm using a Nucleo-F746ZG with timer 2 as a quadrature encoder input. I'm feeding it quadrature signals from 2 GPIOs at 250Hz (each phase is 1mS).The CDR value is 0, so FDTS should be CLK_INT (36MHz for APB1). With both inputs' filter set to 8, the...

MNels.3 · 2021-05-19

Thanks! I did not think to look under CAD resources. I had found a Nucleo-F767 schematic a bit ago that was helpful (I suspect they're the same for the 144 pin boards.)Mike

MNels.3 · 2021-05-19

I think I found it. The GPIO signals were flawless until I plugged GPIO_B in to PA1. Suddenly it has a 50MHz, 1.5Vpp signal on it. We had long since removed Ethernet in cubeMX, but the PHY is still attached to pin PA1 via SB13. It's referenced i...

MNels.3 · 2021-05-19

Thanks for the reply. I'm lost, too. Electrically, the digital oversampling is a low pass filter, but the quadrature signal should be orders of magnitude below the cut off. Even overshoot and ringing don't make sense since those are usually in nan...

MNels.3 · 2021-05-18

Yes, the CR1.CKD value is zero. Sorry for the confusion. I'm using the cubeMX generated code, changing the filter value, and recompiling and reflashing. This is from main.c. htim2.Instance = TIM2; htim2.Init.Prescaler = 0; htim2.Init.Counte...

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Odd encoder filter behavior

Re: Odd encoder filter behavior

Re: Odd encoder filter behavior

Re: Odd encoder filter behavior

Re: Odd encoder filter behavior