/* This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
/** @brief global definitions and methods
 *  @file global.h
 *  @author King Kévin <kingkevin@cuvoodoo.info>
 *  @date 2016
 */
#pragma once
#include <libopencm3/stm32/gpio.h> // GPIO defines
#include <libopencm3/cm3/nvic.h> // interrupt defines
#include <libopencm3/stm32/exti.h> // external interrupt defines

/** get the length of an array */
#define LENGTH(x) (sizeof(x) / sizeof((x)[0]))

/* board LED GPIO */
#if defined(SYSTEM_BOARD)
/** on system board LED is on pin 11/PA1 */
#define LED_RCC RCC_GPIOA 
#define LED_PORT GPIOA
#define LED_PIN	GPIO1
#elif defined(BLUE_PILL)
/** on minimum system LED is on pin 2/PC13 */
#define LED_RCC RCC_GPIOC
#define LED_PORT GPIOC
#define LED_PIN GPIO13
#elif defined (MAPLE_MINI)
/** on maple mini LED is on pin 19/PB1 */
#define LED_RCC RCC_GPIOB
#define LED_PORT GPIOB
#define LED_PIN GPIO1
#endif

/* board user button GPIO */
#if defined(MAPLE_MINI)
/** on maple mini user button is on 32/PB8 */
#define BUTTON_RCC RCC_GPIOB
#define BUTTON_PORT GPIOB
#define BUTTON_PIN GPIO8
#define BUTTON_EXTI EXTI8
#define BUTTON_IRQ NVIC_EXTI9_5_IRQ
#define BUTTON_ISR exti9_5_isr
#endif

/** @brief switch on board LED */
void led_on(void);
/** @brief switch off board LED */
void led_off(void);
/** @brief toggle board LED */
void led_toggle(void);
/** @brief default printf output */
int _write(int file, char *ptr, int len);
/** @brief get binary representation of a number
 *  @param[in] binary number to represent in binary
 *  @param[in] rjust justify representation with leading zeros
 *  @return string with binary representation of the number
 */
char* b2s(uint32_t binary, uint8_t rjust);