Does HAL_NVIC_SetPendingIRQ call the ISR to execute? - stm32

Question

I am really new to STM32 world so I came across this while reading:
void HAL_NVIC_SetPendingIRQ(IRQn_Type IRQn);
This will cause the interrupt to fire, as it would be generated by the hardware. A distinctive feature
of Cortex-M processors it that it is possible to programmatically fire an interrupt inside the ISR
routine of another interrupt.
I got this from the book Mastering STM32 (by Carmine Noviello page 208). From this I have understood that If we set this pending bit even from the main function, then the interrupt is generated.
So to try this out, I have written this code:
while (1)
{
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_14, GPIO_PIN_SET);
for(int i = 0; i <10000000; i++);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_14, GPIO_PIN_RESET);
for(int i = 0; i <10000000; i++);
HAL_NVIC_SetPendingIRQ(EXTI0_IRQn);
}
}
along with this call back function
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_PIN){
HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_15);
}
I have programmed GPIO_PIN_0 as source of interrupt and when I press the push button connected to PA0 the Interrupt works perfectly i.e. ISR is executed. To my surprice HAL_NVIC_SetPendingIRQ function doesn't generate interrupt. I don't understand why?
More Info:
I am using STM32F411VET6 DISCO board
I am using STM32CubeIDE to program the board

Answer 1

Thank you #Tagli. I have found the function HAL_GPIO_EXTI_IRQHandler inside stm32f4xx_hal_gpio.c file. Defalult definition was like this:
void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)
{
/* EXTI line interrupt detected */
if(__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != RESET)
{
__HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
HAL_GPIO_EXTI_Callback(GPIO_Pin);
}
}
I got why the GPIO was not being toggled. It was the same reason you have commented above.
I have modified to prove it.
void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)
{
/* EXTI line interrupt detected */
HAL_GPIO_EXTI_Callback(GPIO_Pin);
if(__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != RESET)
{
__HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
HAL_GPIO_EXTI_Callback(GPIO_Pin);
}
}
Now the callback function is called when the HAL_NVIC_SetPendingIRQ(EXTI0_IRQn); is being called