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/******************************************************************************
* The MIT License
*
* Copyright (c) 2011 LeafLabs, LLC.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
/**
* @file libmaple/stm32f2/gpio.h
* @brief STM32F2 General Purpose I/O (GPIO) header.
*/
#ifndef _LIBMAPLE_STM32F2_GPIO_H_
#define _LIBMAPLE_STM32F2_GPIO_H_
#ifdef __cplusplus
extern "C"{
#endif
#include <libmaple/libmaple.h>
#include <libmaple/rcc.h>
/*
* GPIO register maps and devices
*/
/** GPIO register map type */
typedef struct gpio_reg_map {
__io uint32 MODER; /**< Mode register */
__io uint32 OTYPER; /**< Output type register */
__io uint32 OSPEEDR; /**< Output speed register */
__io uint32 PUPDR; /**< Pull-up/pull-down register */
__io uint32 IDR; /**< Input data register */
__io uint32 ODR; /**< Output data register */
__io uint32 BSRR; /**< Bit set/reset register */
__io uint32 LCKR; /**< Configuration lock register */
__io uint32 AFRL; /**< Alternate function low register */
__io uint32 AFRH; /**< Alternate function high register */
} gpio_reg_map;
/** GPIO port A register map base pointer */
#define GPIOA_BASE ((struct gpio_reg_map*)0x40020000)
/** GPIO port B register map base pointer */
#define GPIOB_BASE ((struct gpio_reg_map*)0x40020400)
/** GPIO port C register map base pointer */
#define GPIOC_BASE ((struct gpio_reg_map*)0x40020800)
/** GPIO port D register map base pointer */
#define GPIOD_BASE ((struct gpio_reg_map*)0x40020C00)
/** GPIO port E register map base pointer */
#define GPIOE_BASE ((struct gpio_reg_map*)0x40021000)
/** GPIO port F register map base pointer */
#define GPIOF_BASE ((struct gpio_reg_map*)0x40021400)
/** GPIO port G register map base pointer */
#define GPIOG_BASE ((struct gpio_reg_map*)0x40021800)
/** GPIO port H register map base pointer */
#define GPIOH_BASE ((struct gpio_reg_map*)0x40021C00)
/** GPIO port I register map base pointer */
#define GPIOI_BASE ((struct gpio_reg_map*)0x40022000)
/** GPIO device type */
typedef struct gpio_dev {
gpio_reg_map *regs;
rcc_clk_id clk_id;
} gpio_dev;
extern gpio_dev* const GPIOA;
extern gpio_dev gpioa;
extern gpio_dev* const GPIOB;
extern gpio_dev gpiob;
extern gpio_dev* const GPIOC;
extern gpio_dev gpioc;
extern gpio_dev* const GPIOD;
extern gpio_dev gpiod;
extern gpio_dev* const GPIOE;
extern gpio_dev gpioe;
extern gpio_dev* const GPIOF;
extern gpio_dev gpiof;
extern gpio_dev* const GPIOG;
extern gpio_dev gpiog;
extern gpio_dev* const GPIOH;
extern gpio_dev gpioh;
extern gpio_dev* const GPIOI;
extern gpio_dev gpioi;
/*
* Register bit definitions
*
* Currently, we only provide masks to be used for shifting, rather
* than repeating the same values 16 times.
*/
/* Mode register */
#define GPIO_MODER_INPUT 0x0
#define GPIO_MODER_OUTPUT 0x1
#define GPIO_MODER_AF 0x2
#define GPIO_MODER_ANALOG 0x3
/* Output type register */
#define GPIO_OTYPER_PP 0x0
#define GPIO_OTYPER_OD 0x1
/* Output speed register */
#define GPIO_OSPEEDR_LOW 0x0
#define GPIO_OSPEEDR_MED 0x1
#define GPIO_OSPEEDR_FAST 0x2
#define GPIO_OSPEEDR_HIGH 0x3
/* Pull-up/pull-down register */
#define GPIO_PUPDR_NOPUPD 0x0
#define GPIO_PUPDR_PU 0x1
#define GPIO_PUPDR_PD 0x2
/*
* GPIO routines
*/
/**
* @brief GPIO pin modes
*/
typedef enum gpio_pin_mode {
GPIO_MODE_INPUT = GPIO_MODER_INPUT, /**< Input mode */
GPIO_MODE_OUTPUT = GPIO_MODER_OUTPUT, /**< Output mode */
GPIO_MODE_AF = GPIO_MODER_AF, /**< Alternate function mode */
GPIO_MODE_ANALOG = GPIO_MODER_ANALOG, /**< Analog mode */
} gpio_pin_mode;
/**
* @brief Additional flags to be used when setting a pin's mode.
*
* Beyond the basic modes (input, general purpose output, alternate
* function, and analog), there are three parameters that can affect a
* pin's mode:
*
* 1. Output type: push/pull or open-drain. This only has an effect
* for output modes. Choices are: GPIO_MODEF_TYPE_PP (the default)
* and GPIO_MODEF_TYPE_OD.
*
* 2. Output speed: specifies the frequency at which a pin changes
* state. This only has an effect for output modes. Choices are:
* GPIO_MODEF_SPEED_LOW (default), GPIO_MODEF_SPEED_MED,
* GPIO_MODEF_SPEED_FAST, and GPIO_MODEF_SPEED_HIGH.
*
* 3. Push/pull setting: All GPIO pins have weak pull-up and pull-down
* resistors that can be enabled when the pin's mode is
* set. Choices are: GPIO_MODEF_PUPD_NONE (default),
* GPIO_MODEF_PUPD_PU, and GPIO_MODEF_PUPD_PD.
*/
typedef enum gpio_mode_flags {
/* Output type in bit 0 */
GPIO_MODEF_TYPE_PP = GPIO_OTYPER_PP, /**< Output push/pull (default).
Applies only when the mode
specifies output. */
GPIO_MODEF_TYPE_OD = GPIO_OTYPER_OD, /**< Output open drain.
Applies only when the mode
specifies output. */
/* Speed in bits 2:1 */
GPIO_MODEF_SPEED_LOW = GPIO_OSPEEDR_LOW << 1, /**< Low speed (default):
2 MHz. */
GPIO_MODEF_SPEED_MED = GPIO_OSPEEDR_MED << 1, /**< Medium speed: 25 MHz. */
GPIO_MODEF_SPEED_FAST = GPIO_OSPEEDR_FAST << 1, /**< Fast speed: 50 MHz. */
GPIO_MODEF_SPEED_HIGH = GPIO_OSPEEDR_HIGH << 1, /**< High speed:
100 MHz on 30 pF,
80 MHz on 15 pF. */
/* Pull-up/pull-down in bits 4:3 */
GPIO_MODEF_PUPD_NONE = GPIO_PUPDR_NOPUPD << 3, /**< No pull-up/pull-down
(default). */
GPIO_MODEF_PUPD_PU = GPIO_PUPDR_PU << 3, /**< Pull-up */
GPIO_MODEF_PUPD_PD = GPIO_PUPDR_PD << 3, /**< Pull-down */
} gpio_mode_flags;
void gpio_set_modef(gpio_dev *dev,
uint8 pin,
gpio_pin_mode mode,
unsigned flags);
/**
* @brief Set the mode of a GPIO pin.
*
* Calling this function is equivalent to calling gpio_set_modef(dev,
* pin, mode, GPIO_MODE_SPEED_HIGH). Note that this overrides the
* default speed.
*
* @param dev GPIO device.
* @param pin Pin on the device whose mode to set, 0--15.
* @param mode Mode to set the pin to.
*/
static inline void gpio_set_mode(gpio_dev *dev,
uint8 pin,
gpio_pin_mode mode) {
gpio_set_modef(dev, pin, mode, GPIO_MODEF_SPEED_HIGH);
}
#ifdef __cplusplus
}
#endif
#endif
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