stm32gpiohal
what's the defualt value of GPIO_InitTypeDef
I have checked stm32f4xx_hal_gpio.c or .h, but I can't find out by Alternate is 0 defualtly
Alternate is not 0 defualtly
Solution
Armandas has explained what the value will be if you do not assign to it.
The legal values that can be assigned to the member Alternate are listed under GPIO_Alternate_function_selection in the file stm32f4xx_hal_gpio_ex.h, for example GPIO_AF9_TIM12.
If you are not using alternate function mode, leave the value undefined or set it to zero.
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