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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
*
* 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 gpio.h
*
* @brief GPIO prototypes, defines, and inlined access functions
*/
#ifndef _GPIO_H
#define _GPIO_H
/* Each of the GPIO port bits can be in the following modes (STM32 138/995):
* Input floating
* Input pull-up
* Input pull-down
* Analog Input
* Output open-drain
* Output push-pull
* Alternate function push-pull
* Alternate function open-drain
*
* - After reset, the alternate functions are not active and IO prts
* are set to Input Floating mode, EXCEPT for the Serial Wire and JTAG
* ports, which are in alternate function mode by default. */
#define AFIO_MAPR ((volatile uint32*)0x40010004)
#define GPIOA_BASE ((GPIO_Port*)0x40010800)
#define GPIOB_BASE ((GPIO_Port*)0x40010C00)
#define GPIOC_BASE ((GPIO_Port*)0x40011000)
#define GPIOD_BASE ((GPIO_Port*)0x40011400)
#define GPIOE_BASE ((GPIO_Port*)0x40011800) // High-density devices only
#define GPIOF_BASE ((GPIO_Port*)0x40011C00) // High-density devices only
#define GPIOG_BASE ((GPIO_Port*)0x40012000) // High-density devices only
#define GPIO_SPEED_50MHZ (0x3)
#define MODE_OUTPUT_PP ((0x00 << 2) | GPIO_SPEED_50MHZ)
#define MODE_OUTPUT_OD ((0x01 << 2) | GPIO_SPEED_50MHZ)
#define MODE_AF_OUTPUT_PP ((0x02 << 2) | GPIO_SPEED_50MHZ)
#define MODE_AF_OUTPUT_OD ((0x03 << 2) | GPIO_SPEED_50MHZ)
#define CNF_INPUT_ANALOG (0x00 << 2)
#define CNF_INPUT_FLOATING (0x01 << 2)
#define CNF_INPUT_PD (0x02 << 2)
#define CNF_INPUT_PU (0x02 << 2)
typedef enum GPIOPinMode {
GPIO_MODE_OUTPUT_PP = MODE_OUTPUT_PP,
GPIO_MODE_OUTPUT_OD = MODE_OUTPUT_OD,
GPIO_MODE_AF_OUTPUT_PP = MODE_AF_OUTPUT_PP,
GPIO_MODE_AF_OUTPUT_OD = MODE_AF_OUTPUT_OD,
GPIO_MODE_INPUT_ANALOG = CNF_INPUT_ANALOG,
GPIO_MODE_INPUT_FLOATING = CNF_INPUT_FLOATING,
GPIO_MODE_INPUT_PD = CNF_INPUT_PD,
GPIO_MODE_INPUT_PU,
} GPIOPinMode;
typedef struct {
volatile uint32 CRL; // Port configuration register low
volatile uint32 CRH; // Port configuration register high
volatile uint32 IDR; // Port input data register
volatile uint32 ODR; // Port output data register
volatile uint32 BSRR; // Port bit set/reset register
volatile uint32 BRR; // Port bit reset register
volatile uint32 LCKR; // Port configuration lock register
} GPIO_Port;
typedef volatile uint32* GPIOReg;
#define POS_MASK(shift) (~(0xF << shift))
#define POS(val) (val << 2)
#ifdef __cplusplus
extern "C"{
#endif
void gpio_init(void);
void gpio_set_mode(GPIO_Port* port, uint8 gpio_pin, GPIOPinMode mode);
static inline void gpio_write_bit(GPIO_Port *port, uint8 gpio_pin, uint8 val) {
if (val){
port->BSRR = BIT(gpio_pin);
} else {
port->BRR = BIT(gpio_pin);
}
}
static inline uint32 gpio_read_bit(GPIO_Port *port, uint8 gpio_pin) {
return (port->IDR & BIT(gpio_pin) ? 1 : 0);
}
/* For pins configured as output push-pull, reading the ODR returns
* the last value written in push-pull mode.
*/
static inline void gpio_toggle_pin(GPIO_Port *port, uint8 gpio_pin) {
port->ODR = port->ODR ^ BIT(gpio_pin);
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif
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