HAL库的学习方法
如何获得函数使用说明
在HAL库的文件中查找
/**
* @brief Initializes the GPIOx peripheral according to the specified parameters in the GPIO_Init.
* @param GPIOx: where x can be (A..G depending on device used) to select the GPIO peripheral
* @param GPIO_Init: pointer to a GPIO_InitTypeDef structure that contains
* the configuration information for the specified GPIO peripheral.
* @retval None
*/查看使用手册.chm文件
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