MC100/Applications/bsp/mc_hall_gpio.c

#include "bsp/mc_hall_gpio.h"
static void _gpio_irq_enable(void);

void mc_hall_init(void){
	rcu_periph_clock_enable(HALL_GPOI_CLK);
	gpio_init(HALL_1_GROUP,  GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, HALL_1_PIN);
	gpio_init(HALL_2_GROUP,  GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, HALL_2_PIN);
	gpio_init(HALL_3_GROUP,  GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, HALL_3_PIN);

	_gpio_irq_enable();
}

int get_hall_stat(int samples) {
	samples = 1 + 2 * samples;

	int h1 = 0, h2 = 0, h3 = 0;
	int tres = samples / 2;

	while (samples--) {
		h1 += READ_HALL1();
		h2 += READ_HALL2();
		h3 += READ_HALL3();
	}
	return (h1 > tres) | ((h2 > tres) << 1) | ((h3 > tres) << 2);
}

static void _gpio_irq_enable(void){
	gpio_exti_source_select(GPIO_PORT_SOURCE_GPIOB, GPIO_PIN_SOURCE_6);
	exti_init(EXTI_6, EXTI_INTERRUPT, EXTI_TRIG_BOTH);
	exti_interrupt_flag_clear(EXTI_6);
	exti_interrupt_enable(EXTI_6);

	gpio_exti_source_select(GPIO_PORT_SOURCE_GPIOB, GPIO_PIN_SOURCE_7);
	exti_init(EXTI_7, EXTI_INTERRUPT, EXTI_TRIG_BOTH);
	exti_interrupt_flag_clear(EXTI_7);
	exti_interrupt_enable(EXTI_7);

	gpio_exti_source_select(GPIO_PORT_SOURCE_GPIOB, GPIO_PIN_SOURCE_8);
	exti_init(EXTI_8, EXTI_INTERRUPT, EXTI_TRIG_BOTH);
	exti_interrupt_flag_clear(EXTI_8);
	exti_interrupt_enable(EXTI_8);

	nvic_irq_enable(EXTI5_9_IRQn, 3U, 0U);
}