Init Button. Interrupt still missing

stm-firmware/button.c

@@ -18,4 +18,28 @@
 * If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <stm32/stm32f4xx.h>
 #include <reflow-controller/button.h>
+#include <stm-periph/clock-enable-manager.h>
+#include <stdint.h>
+
+static volatile uint64_t to_active_timestamp;
+
+void button_init()
+{
+	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(BUTTON_RCC_MASK));
+	BUTTON_PORT->MODER &= MODER_DELETE(BUTTON_PIN);
+	BUTTON_PORT->PUPDR &= PUPDR_DELETE(BUTTON_PIN);
+	BUTTON_PORT->PUPDR |= PULLUP(BUTTON_PIN);
+
+
+}
+
+enum button_state button_read_event();
+
+void button_deinit()
+{
+	BUTTON_PORT->MODER &= MODER_DELETE(BUTTON_PIN);
+	BUTTON_PORT->PUPDR &= PUPDR_DELETE(BUTTON_PIN);
+	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(BUTTON_RCC_MASK));
+}

stm-firmware/include/reflow-controller/button.h

@@ -21,4 +21,21 @@
 #ifndef __BUTTON_H__
 #define __BUTTON_H__
 
+#define BUTTON_ACTIVE_LEVEL 0
+#define BUTTON_PORT GPIOD
+#define BUTTON_RCC_MASK RCC_AHB1ENR_GPIODEN
+#define BUTTON_PIN 4
+
+#define BUTTON_SHORT_ON_TIME_MS 50
+#define BUTTON_LONG_ON_TIME_MS 800
+
+enum button_state {BUTTON_IDLE = 0, BUTTON_SHORT, BUTTON_LONG};
+
+void button_init();
+
+enum button_state button_read_event();
+
+void button_deinit();
+
+
 #endif /* __BUTTON_H__ */

stm-firmware/include/stm-periph/stm32-gpio-macros.h

@@ -22,6 +22,7 @@
 #define __STM32GPIOMACROS_H__
 
 #define MODER_DELETE(pin) ~(0x3U << (pin * 2))
+#define PUPDR_DELETE(pin) ~(0x3U << (pin * 2))
 #define OUTPUT(pin)  (0x01U << (pin * 2))
 #define PULLUP(pin) (0x1U << (pin* 2))
 #define ALTFUNC(pin) ((0x2) << (pin * 2))