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/**
* @file gpio.h
* Abstracts gpio access, makes things easier
*/
#ifndef GPIO_H_
#define GPIO_H_
#include <stm32l476xx.h>
/**
* Helps simplify gpio calls.
* @param p port, e.g. GPIOA
* @param b pin, e.g. 4
*/
#define GPIO_PORT(p, b) GPIO##p, b
/**
* Defines possible modes for a gpio pin
*/
enum GPIO_MODE
{
INPUT = 0, /**< digital input */
OUTPUT, /**< digital output */
ALTERNATE, /**< alternate function */
ANALOG /**< analog function */
};
/**
* Defines whether to use push-pull or open drain.
*/
enum GPIO_TYPE
{
PUSHPULL = 0, /**< push-pull */
OPENDRAIN /**< open drain */
};
/**
* Defines the pin's speed
*/
enum GPIO_SPEED
{
LOW = 0, /**< low */
MEDIUM, /**< medium */
HIGH, /**< high */
VERYHIGH /**< very high/maximum */
};
/**
* Defines if a pullup or pulldown should be used.
*/
enum GPIO_PUPD
{
NOPUPD, /**< no pullup/pulldown */
PULLUP, /**< use pullup */
PULLDOWN /**< use pulldown */
};
/**
* Initializes the gpio.
*/
void gpio_init(void);
/**
* Enables or disables pullup/pulldown for the given pin.
* @param port the port, e.g. GPIOA
* @param pin the pin
* @param pupd pullup/pulldown enable
* @see GPIO_PUPD
*/
void gpio_pupd(GPIO_TypeDef *port, uint8_t pin, uint8_t pupd);
/**
* Sets whether to use push-pull or open drain for the given pin.
* @param port the port
* @param pin the pin
* @param type what to use
* @see GPIO_TYPE
*/
void gpio_type(GPIO_TypeDef *port, uint8_t pin, uint8_t type);
/**
* Sets the pin's speed.
* @param port the port
* @param pin the pin
* @param speed the speed to use
* @see GPIO_SPEED
*/
void gpio_speed(GPIO_TypeDef *port, uint8_t pin, uint8_t speed);
/**
* Sets the pin's i/o mode.
* @param port the port
* @param pin the pin
* @param mode the mode to use
* @see GPIO_MODE
*/
void gpio_mode(GPIO_TypeDef *port, uint8_t pin, uint8_t mode);
/**
* Sets the state of a digital output pin.
* @param port the port
* @param pin the pin
* @param val non-zero for high, zero for low
*/
void gpio_dout(GPIO_TypeDef *port, uint8_t pin, uint8_t val);
/**
* Reads a digital input pin.
* @param port the port
* @param pin the pin
* @return non-zero for high, zero for low
*/
uint8_t gpio_din(GPIO_TypeDef *port, uint8_t pin);
#endif // GPIO_H_
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