W806 How to configure the interrupt vector and interrupt priority, How do I write an interrupt handler.

This is from the ah in startup. S In the file, I thought that was the interrupt vector table at the beginning, The name inside is the name of the interrupt handler, official demo There are interrupt related examples in the example

From the official group SDK, GPIO interrupted demo
WM_SDK_W806_v0. 6. 0

'''
static void GPIO_Init (void)
{

GPIO_InitTypeDef GPIO_InitStruct = {0}; 

__HAL_RCC_GPIO_CLK_ENABLE () ; 

GPIO_InitStruct. Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2; 
GPIO_InitStruct. Mode = GPIO_MODE_OUTPUT; 
GPIO_InitStruct. Pull = GPIO_NOPULL; 
HAL_GPIO_Init (GPIOB,  &GPIO_InitStruct) ; 
HAL_GPIO_WritePin (GPIOB,  GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2,  GPIO_PIN_SET) ; 

GPIO_InitStruct. Pin = GPIO_PIN_5; 
GPIO_InitStruct. Mode = GPIO_MODE_IT_FALLING; 
GPIO_InitStruct. Pull = GPIO_PULLUP; 
HAL_GPIO_Init (GPIOB,  &GPIO_InitStruct) ; 

HAL_NVIC_SetPriority (GPIOB_IRQn,  0) ; 
HAL_NVIC_EnableIRQ (GPIOB_IRQn) ; 

}
'''