I am currently developing a touchgfx GUI for a custom board which is based on the STM32F429-DISCO, therefore I use said board for the fundamental development. While initializing hardware button controll via GPIO_EXTI lines I have run into a strange issue I can workaround for now but not solve.
Initially I planned on using GPIOB EXTI lines 12 to 15 (PB12 - PB15) for external buttons. The procedure is based on the tutorials STM32 Graphics: Using “Hardware button is clicked�? at Interactions, Part 1 and Part 2. But for some reason EXTI line 14 and 15 do not work on GPIO Port B. I have tried the same EXTI lines on different ports and they are working fine, so I figured it has something to do with Port B but I can't wrap my head around the cause for it.
It's not that big of an issue for now as I have a few more pins I can use for said EXTI lines but I would like to know why PB14/15 do not work. So if you have a clue on this I would highly appreciate your help!
Callback function for EXTI where I put a breakpoint to check for correct interrupt event:
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if(GPIO_Pin == GPIO_PIN_15)
{
User_ButtonState= 0x01;
}
}
