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pwm output deviation [Copy link]

Thank you very much eeworld. Ufun provided Ufun board before. Today I used this board to do a PWM output accuracy test and found that when the deviation is 10khz, the PWM output deviation is close to 1%. When the frequency is low, the deviation gradually decreases. The PWM1 on the sampling board, that is, the PWM3 of TIM4 of STM32F103, is divided by 10. After modifying this deviation, it is not fixed. After several standard frequencies are output, there is a deviation. It feels very strange. PWM is hardware output, there should not be such a deviation. Is there something wrong with my sampling?

pwm输出偏差.docx

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pwm偏差

This post is from stm32/stm8
Personal signaturehttp://www.jslaser.com高性价比激光测距传感器
 

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Attached is my screenshot and calculation
This post is from stm32/stm8
 
Personal signaturehttp://www.jslaser.com高性价比激光测距传感器
 

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