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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
* Copyright (c) 2011, 2012 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/include/libmaple/gpio.h
* @brief General Purpose I/O (GPIO) interace.
*/
#ifndef _LIBMAPLE_GPIO_H_
#define _LIBMAPLE_GPIO_H_
#ifdef __cplusplus
extern "C"{
#endif
/*
* Note: Series header must define:
* - enum gpio_pin_mode (TODO think harder about portability here)
*/
#include <series/gpio.h>
#include <libmaple/libmaple_types.h>
#include <libmaple/rcc.h>
#include <libmaple/exti.h>
/*
* Device type
*/
/** GPIO device type */
typedef struct gpio_dev {
gpio_reg_map *regs; /**< Register map */
rcc_clk_id clk_id; /**< RCC clock information */
/**
* @brief (Deprecated) External interrupt port.
* Instead of dev->exti_port, use gpio_exti_port(dev).
*/
exti_cfg exti_port;
} gpio_dev;
/*
* Portable routines
*/
void gpio_init(gpio_dev *dev);
void gpio_init_all(void);
/* TODO flags argument version? */
void gpio_set_mode(gpio_dev *dev, uint8 pin, gpio_pin_mode mode);
/**
* @brief Get a GPIO port's corresponding EXTI port configuration.
* @param dev GPIO port whose exti_cfg to return.
*/
static inline exti_cfg gpio_exti_port(gpio_dev *dev) {
return (exti_cfg)(EXTI_PA + (dev->clk_id - RCC_GPIOA));
}
/**
* Set or reset a GPIO pin.
*
* Pin must have previously been configured to output mode.
*
* @param dev GPIO device whose pin to set.
* @param pin Pin on to set or reset
* @param val If true, set the pin. If false, reset the pin.
*/
static inline void gpio_write_bit(gpio_dev *dev, uint8 pin, uint8 val) {
val = !val; /* "set" bits are lower than "reset" bits */
dev->regs->BSRR = (1U << pin) << (16 * val);
}
/**
* Determine whether or not a GPIO pin is set.
*
* Pin must have previously been configured to input mode.
*
* @param dev GPIO device whose pin to test.
* @param pin Pin on dev to test.
* @return True if the pin is set, false otherwise.
*/
static inline uint32 gpio_read_bit(gpio_dev *dev, uint8 pin) {
return dev->regs->IDR & (1U << pin);
}
/**
* Toggle a pin configured as output push-pull.
* @param dev GPIO device.
* @param pin Pin on dev to toggle.
*/
static inline void gpio_toggle_bit(gpio_dev *dev, uint8 pin) {
dev->regs->ODR = dev->regs->ODR ^ (1U << pin);
}
#ifdef __cplusplus
}
#endif
#endif
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