看下函数原型就明白了
/**
* @brief Writes data to the specified GPIO data port.
* @param GPIOx: where x can be (A, B, C, D or F) to select the GPIO peripheral.
* @param PortVal: specifies the value to be written to the port output data register.
* @retval None
*/
void GPIO_Write(GPIO_TypeDef* GPIOx, uint16_t PortVal)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
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