#ifndef GPIO_H
#define GPIO_H

#include "types.h"

/* GPIO pins used for the LCD display */
#define PIN_DISPLAY_SPI_CLOCK PIN_2
#define PIN_DISPLAY_SPI_MOSI PIN_3
#define PIN_DISPLAY_COMMAND_DATA PIN_18
#define PIN_DISPLAY_CHIP_SELECT PIN_25
#define PIN_DISPLAY_RESET PIN_26

/* GPIO pins used for the touch panel */
#define PIN_TOUCH_PANEL_RESET PIN_10
#define PIN_TOUCH_PANEL_IRQ PIN_28
#define PIN_TOUCH_PANEL_I2C_SDA PIN_06
#define PIN_TOUCH_PANEL_I2C_SCL PIN_07

/* GPIO pins used for the battery management */
#define PIN_BATTERY_CHARGE_INDICATOR PIN_12
#define PIN_BATTERY_VOLTAGE PIN_31

/* GPIO pins used for the button */
#define PIN_BUTTON_ENABLE PIN_15
#define PIN_BUTTON_PRESS PIN_13

/* GPIO pins used for the accelerometer */
#define PIN_ACCEL_I2C_SDA PIN_06
#define PIN_ACCEL_I2C_SCL PIN_07
#define PIN_ACCEL_IRQ PIN_08

/**
 * The signal level of a GPIO line.
 */
enum gpio_level {
	LOW = 0,
	HIGH = 1,
};

/**
 * The availables GPIO pins on the NRF82832.
 */
enum gpio_pin {
	PIN_0 = 0,
	PIN_1 = 1,
	PIN_2 = 2,
	PIN_3 = 3,
	PIN_4 = 4,
	PIN_5 = 5,
	PIN_6 = 6,
	PIN_7 = 7,
	PIN_8 = 8,
	PIN_9 = 9,
	PIN_10 = 10,
	PIN_11 = 11,
	PIN_12 = 12,
	PIN_13 = 13,
	PIN_14 = 14,
	PIN_15 = 15,
	PIN_16 = 16,
	PIN_17 = 17,
	PIN_18 = 18,
	PIN_19 = 19,
	PIN_20 = 20,
	PIN_21 = 21,
	PIN_22 = 22,
	PIN_23 = 23,
	PIN_24 = 24,
	PIN_25 = 25,
	PIN_26 = 26,
	PIN_27 = 27,
	PIN_28 = 28,
	PIN_29 = 29,
	PIN_30 = 30,
	PIN_31 = 31,
};

/**
 * Init the given pin.
 * Note that each pin configuration is hardcoded to fit the peripheral it is connected to.
 */
void gpio_init_pin(enum gpio_pin pin);

/**
 * Disable a GPIO pin.
 */
u8 gpio_disable_pin(enum gpio_pin pin);

/**
 * Read the current signal level of the given GPIO pin.
 */
enum gpio_level gpio_read_pin(enum gpio_pin pin);

/**
 * Set the given GPIO pin to the given level.
 * Returns 0 if the given pin is not an output pin.
 * Returns 1 if written successfully
 */
u8 gpio_write_pin(enum gpio_pin pin, enum gpio_level level);

#endif