/* (c) Daniele Lacamera 2019
 * GPL
 */


#include <stdint.h>
#include <stdlib.h>
#include "system.h"
#include "button.h"
#include "unicore-mx/stm32/gpio.h"
#include "unicore-mx/stm32/exti.h"
#include "unicore-mx/stm32/rcc.h"
#include <unicore-mx/cm3/nvic.h>




volatile int button_press_pending = 0;

#define KEYA_PIN 13 // pc13
#define KEYB_PIN 2  // pb2


void button_setup(void)
{
    int i;
    uint32_t exti_irq;
    rcc_periph_clock_enable(RCC_GPIOB);
    rcc_periph_clock_enable(RCC_GPIOC);
    rcc_periph_clock_enable(RCC_AFIO);

    gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, KEYB_PIN);
    gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, KEYA_PIN);
    gpio_clear(GPIOB, KEYB_PIN);
    gpio_clear(GPIOC, KEYA_PIN);

    nvic_enable_irq(NVIC_EXTI15_10_IRQ);
    nvic_enable_irq(NVIC_EXTI2_IRQ);

    nvic_set_priority(NVIC_EXTI15_10_IRQ, 1);
    nvic_set_priority(NVIC_EXTI2_IRQ, 1);
    gpio_set_mode(GPIOC, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, KEYA_PIN);
    gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, KEYB_PIN);

    exti_select_source(KEYA_PIN, GPIOC);
    exti_select_source(KEYB_PIN, GPIOB);
}

void button_start_read(void)
{
    exti_set_trigger(KEYA_PIN, EXTI_TRIGGER_FALLING);
    exti_set_trigger(KEYB_PIN, EXTI_TRIGGER_RISING);
    exti_enable_request(KEYA_PIN);
}

void isr_exti15_10(void)
{
    exti_reset_request(KEYA_PIN);
    button_press_pending++;
}

void isr_exti2(void)
{
    exti_reset_request(KEYB_PIN);
    button_press_pending++;
}