About SZony.1

SZony.1 · 2021-01-04

Hi, I'm testing various PWM scenarios and found that output frequency does not match with expected. I'm using formula Period = (PSC+1)*(ARR+1) / TmerClockFreq in seconds Period = 1000 * (PSC+1)*(ARR+1) / TmerClockFreq in milliseconds. The board is Nu...

SZony.1 · 2021-01-06

I measured a point on the MCO, frequency 7.97 Mhz, that's OK. What is interesting, any changes of clock settings (HSE, HSI, frequency from 80 to 240 Mhz) does not change result : 33.33 Mhz as is close 64 Mhz HSI RC /2. Or the problem is on initializa...

SZony.1 · 2021-01-06

I received Blue Pill from Aliexpress today, I’m not sure even the original chip. But it works as expected.

SZony.1 · 2021-01-05

Do you mean those settings?

SZony.1 · 2021-01-04

It is measured in debug mode, right after command HAL_TIM_PWM_Start(); Well, maybe debug is problem I'll try flashed MCU. Thanks.

SZony.1 · 2021-01-04

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Newbie question about PWM output accuracy

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