The problem that some channels of stm32 TIM output pwm cannot be output-EEWORLD

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I was playing with the servo tonight and looked at the code of the example program. I wanted to change the channel to practice, so I wanted to change the channel of TIM1 from ch1 to ch2, so I changed PA8 to PA9 (it is on the data sheet), and changed TIM_OC1PreloadConfig to TIM_OC2PreloadConfig. I tried it but it didn’t work. Then I looked for where OC1 was not changed to OC2, and found that TIM_OC1Init was not changed, so I changed it to TIM_OC2Init. I tried it but it still didn’t work. I searched for a long time in pwm.c but couldn’t find it. I looked for the answer online and thought that ch2 was closed by default, but found that it was not. Later, I finally found that TIM_SetCompare1 in the main function was not changed to TIM_SetCompare2. This carelessness took me an hour to find the answer. . .

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