InterruptIn rise/fall methods overwrite pullup/pulldown mode for STM32F4 targets #2638
Description
The gpio_irq_set function calls pin_function with GPIO_NOPULL.
The code below was used to generate the issue on an STM32F429i-DISCO board using the DISCO_F429ZI target. If the mode method is called after rise/fall it works as expected.
`
include <stdio.h>
include <string.h>
include "mbed.h"
InterruptIn button(PF_2);
DigitalOut led1(LED1);
DigitalOut led2(LED2);
void handleRise() {
led1 = 1;
led2 = 0;
}
void handleFall() {
led1 = 0;
led2 = 1;
}
int main() {
button.mode(PullUp); // Set PF_2 to pullup. GPIOF->PUPDR=0x00000010 -> OK
button.rise(&handleRise); // Will overwrite the mode. GPIOF->PUPDR=0x00000000 -> Not OK
button.fall(&handleFall); // Will overwrite the mode. GPIOF->PUPDR=0x00000000 -> Not OK
while (1) {
wait(0.25);
}
}
`