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#ifndef GPIO_H__
#define GPIO_H__
#include "common.h"
#include <stdint.h>
/*
* Possible GPIO ports.
*/
typedef enum {
GPIO_PORT_A = 0,
GPIO_PORT_B = 1,
GPIO_PORT_C = 2,
GPIO_PORT_D = 3
} gpio_port_number_t;
/*
* Structure defining the layout of the layout of the GPIO registers on the
* stm32l432 development board.
*/
typedef struct GPIO_PORT_STR {
__IO uint32_t mode_r; /* Mode register */
__IO uint32_t pupd_r; /* Pull up/pull down/none register */
__IO uint32_t speed_r; /* Speed register */
__IO uint32_t type_r; /* Type register */
__IO uint32_t input_r; /* Input data register */
__IO uint32_t output_r; /* Output data register */
__IO uint32_t bsr_r; /* Bit set/reset register */
__IO uint32_t lock_r; /* Lock register */
__IO uint32_t altfn_r; /* Alternate function register */
} PACKED gpio_port_t;
/*
* Enum defining the PINs in a GPIO port. Each port has 16 pins to use in
* the stm32l432.
*/
typedef enum GPIO_PIN_ENUM {
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
} gpio_pin_t;
/*
* Enum defining the pin modes that are possible.
*/
typedef enum {
MODE_INPUT = 0,
MODE_OUTPUT = 1,
MODE_ALTERNATE = 2,
MODE_ANALOG = 3
} gpio_pin_mode_t;
/*
* Enum defining the pin speeds that are possible.
*/
typedef enum {
SPEED_2MHZ = 0,
SPEED_10MHZ = 1,
SPEED_50MHZ = 3,
} speed_t;
/*
* Structure defining an OUTPUT pin. Structurally equivalent to the input pin,
* but can be used in a slightly type-safe manner.
*/
typedef struct {
__IO gpio_port_t* gpio_port;
gpio_pin_t pin;
} gpio_output_pin_t;
/*
* Sets the mode on a GPIO pin.
*
* gpio_port: the gpio port to use.
* pin: the pin number to set.
* pin_mode: the mode to set the pin to.
*/
void set_gpio_pin_mode(
__IO gpio_port_t* gpio_port,
gpio_pin_t pin,
gpio_pin_mode_t pin_mode);
/*
* Sets the given GPIO pin to be an output pin. Returns an output_pin struct
* corresponding to
*/
gpio_output_pin_t set_gpio_pin_output(
__IO gpio_port_t* gpio_port,
gpio_pin_t pin);
/*
* Sets an output pin on or off.
*
* pin: the pin to toggle.
* onoff: 0 for off, non-zero of on.
*/
void set_gpio_output_pin(
gpio_output_pin_t pin,
bool onoff);
#define pin_on(p) \
set_gpio_output_pin(p, 1)
#define pin_off(p) \
set_gpio_output_pin(p, 0)
/*
* Enables a GPIO port and returns a reference to the register definition
* of that GPIO port.
*/
__IO gpio_port_t* enable_gpio(gpio_port_number_t number);
#endif /* GPIO_H__ */
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