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stm32_gpio.h
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stm32_gpio.h
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/************************************************************************************
* arch/arm/src/stm32h7/stm32_gpio.h
*
* Copyright (C) 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <[email protected]>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
#ifndef __ARCH_ARM_SRC_STM32H7_STM32_GPIO_H
#define __ARCH_ARM_SRC_STM32H7_STM32_GPIO_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
# include <stdbool.h>
#endif
#include <nuttx/irq.h>
#include "chip.h"
#include "chip/stm32_gpio.h"
/************************************************************************************
* Pre-Processor Declarations
************************************************************************************/
/* Bit-encoded input to stm32_configgpio() */
/* Each port bit of the general-purpose I/O (GPIO) ports can be individually configured
* by software in several modes:
*
* - Input floating
* - Input pull-up
* - Input-pull-down
* - Output open-drain with pull-up or pull-down capability
* - Output push-pull with pull-up or pull-down capability
* - Alternate function push-pull with pull-up or pull-down capability
* - Alternate function open-drain with pull-up or pull-down capability
* - Analog
*
* 20-bit Encoding: 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* Inputs: MMUU .... ...X PPPP BBBB
* Outputs: MMUU .... FFOV PPPP BBBB
* Alternate Functions: MMUU AAAA FFO. PPPP BBBB
* Analog: MM.. .... .... PPPP BBBB
*/
/* Mode:
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* MM.. .... .... .... ....
*/
#define GPIO_MODE_SHIFT (18) /* Bits 18-19: GPIO port mode */
#define GPIO_MODE_MASK (3 << GPIO_MODE_SHIFT)
# define GPIO_INPUT (0 << GPIO_MODE_SHIFT) /* Input mode */
# define GPIO_OUTPUT (1 << GPIO_MODE_SHIFT) /* General purpose output mode */
# define GPIO_ALT (2 << GPIO_MODE_SHIFT) /* Alternate function mode */
# define GPIO_ANALOG (3 << GPIO_MODE_SHIFT) /* Analog mode */
/* Input/output pull-ups/downs (not used with analog):
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* ..UU .... .... .... ....
*/
#define GPIO_PUPD_SHIFT (16) /* Bits 16-17: Pull-up/pull down */
#define GPIO_PUPD_MASK (3 << GPIO_PUPD_SHIFT)
# define GPIO_FLOAT (0 << GPIO_PUPD_SHIFT) /* No pull-up, pull-down */
# define GPIO_PULLUP (1 << GPIO_PUPD_SHIFT) /* Pull-up */
# define GPIO_PULLDOWN (2 << GPIO_PUPD_SHIFT) /* Pull-down */
/* Alternate Functions:
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* .... AAAA .... .... ....
*/
#define GPIO_AF_SHIFT (12) /* Bits 12-15: Alternate function */
#define GPIO_AF_MASK (15 << GPIO_AF_SHIFT)
# define GPIO_AF(n) ((n) << GPIO_AF_SHIFT)
# define GPIO_AF0 (0 << GPIO_AF_SHIFT)
# define GPIO_AF1 (1 << GPIO_AF_SHIFT)
# define GPIO_AF2 (2 << GPIO_AF_SHIFT)
# define GPIO_AF3 (3 << GPIO_AF_SHIFT)
# define GPIO_AF4 (4 << GPIO_AF_SHIFT)
# define GPIO_AF5 (5 << GPIO_AF_SHIFT)
# define GPIO_AF6 (6 << GPIO_AF_SHIFT)
# define GPIO_AF7 (7 << GPIO_AF_SHIFT)
# define GPIO_AF8 (8 << GPIO_AF_SHIFT)
# define GPIO_AF9 (9 << GPIO_AF_SHIFT)
# define GPIO_AF10 (10 << GPIO_AF_SHIFT)
# define GPIO_AF11 (11 << GPIO_AF_SHIFT)
# define GPIO_AF12 (12 << GPIO_AF_SHIFT)
# define GPIO_AF13 (13 << GPIO_AF_SHIFT)
# define GPIO_AF14 (14 << GPIO_AF_SHIFT)
# define GPIO_AF15 (15 << GPIO_AF_SHIFT)
/* Output/Alt function frequency selection:
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* .... .... FF.. .... ....
*/
#define GPIO_SPEED_SHIFT (10) /* Bits 10-11: GPIO frequency selection */
#define GPIO_SPEED_MASK (3 << GPIO_SPEED_SHIFT)
# define GPIO_SPEED_2MHz (0 << GPIO_SPEED_SHIFT) /* 2 MHz Low speed output */
# define GPIO_SPEED_25MHz (1 << GPIO_SPEED_SHIFT) /* 25 MHz Medium speed output */
# define GPIO_SPEED_50MHz (2 << GPIO_SPEED_SHIFT) /* 50 MHz Fast speed output */
# define GPIO_SPEED_100MHz (3 << GPIO_SPEED_SHIFT) /* 100 MHz High speed output */
/* Output/Alt function type selection:
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* .... .... ..O. .... ....
*/
#define GPIO_OPENDRAIN (1 << 9) /* Bit9: 1=Open-drain output */
#define GPIO_PUSHPULL (0) /* Bit9: 0=Push-pull output */
/* If the pin is a GPIO digital output, then this identifies the initial output value.
* If the pin is an input, this bit is overloaded to provide the qualifier to
* distinquish input pull-up and -down:
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* .... .... ...V .... ....
*/
#define GPIO_OUTPUT_SET (1 << 8) /* Bit 8: If output, inital value of output */
#define GPIO_OUTPUT_CLEAR (0)
/* External interrupt selection (GPIO inputs only):
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* .... .... ...X .... ....
*/
#define GPIO_EXTI (1 << 8) /* Bit 8: Configure as EXTI interrupt */
/* This identifies the GPIO port:
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* .... .... .... PPPP ....
*/
#define GPIO_PORT_SHIFT (4) /* Bit 4-7: Port number */
#define GPIO_PORT_MASK (15 << GPIO_PORT_SHIFT)
# define GPIO_PORTA (0 << GPIO_PORT_SHIFT) /* GPIOA */
# define GPIO_PORTB (1 << GPIO_PORT_SHIFT) /* GPIOB */
# define GPIO_PORTC (2 << GPIO_PORT_SHIFT) /* GPIOC */
# define GPIO_PORTD (3 << GPIO_PORT_SHIFT) /* GPIOD */
# define GPIO_PORTE (4 << GPIO_PORT_SHIFT) /* GPIOE */
# define GPIO_PORTF (5 << GPIO_PORT_SHIFT) /* GPIOF */
# define GPIO_PORTG (6 << GPIO_PORT_SHIFT) /* GPIOG */
# define GPIO_PORTH (7 << GPIO_PORT_SHIFT) /* GPIOH */
# define GPIO_PORTI (8 << GPIO_PORT_SHIFT) /* GPIOI */
# define GPIO_PORTJ (9 << GPIO_PORT_SHIFT) /* GPIOJ */
# define GPIO_PORTK (10 << GPIO_PORT_SHIFT) /* GPIOK */
/* This identifies the bit in the port:
*
* 1111 1111 1100 0000 0000
* 9876 5432 1098 7654 3210
* ---- ---- ---- ---- ----
* .... .... .... .... BBBB
*/
#define GPIO_PIN_SHIFT (0) /* Bits 0-3: GPIO number: 0-15 */
#define GPIO_PIN_MASK (15 << GPIO_PIN_SHIFT)
# define GPIO_PIN0 (0 << GPIO_PIN_SHIFT)
# define GPIO_PIN1 (1 << GPIO_PIN_SHIFT)
# define GPIO_PIN2 (2 << GPIO_PIN_SHIFT)
# define GPIO_PIN3 (3 << GPIO_PIN_SHIFT)
# define GPIO_PIN4 (4 << GPIO_PIN_SHIFT)
# define GPIO_PIN5 (5 << GPIO_PIN_SHIFT)
# define GPIO_PIN6 (6 << GPIO_PIN_SHIFT)
# define GPIO_PIN7 (7 << GPIO_PIN_SHIFT)
# define GPIO_PIN8 (8 << GPIO_PIN_SHIFT)
# define GPIO_PIN9 (9 << GPIO_PIN_SHIFT)
# define GPIO_PIN10 (10 << GPIO_PIN_SHIFT)
# define GPIO_PIN11 (11 << GPIO_PIN_SHIFT)
# define GPIO_PIN12 (12 << GPIO_PIN_SHIFT)
# define GPIO_PIN13 (13 << GPIO_PIN_SHIFT)
# define GPIO_PIN14 (14 << GPIO_PIN_SHIFT)
# define GPIO_PIN15 (15 << GPIO_PIN_SHIFT)
/************************************************************************************
* Public Data
************************************************************************************/
#ifndef __ASSEMBLY__
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/* Base addresses for each GPIO block */
EXTERN const uint32_t g_gpiobase[STM32H7_NGPIO];
/************************************************************************************
* Public Function Prototypes
************************************************************************************/
/************************************************************************************
* Name: stm32_configgpio
*
* Description:
* Configure a GPIO pin based on bit-encoded description of the pin.
* Once it is configured as Alternative (GPIO_ALT|GPIO_CNF_AFPP|...)
* function, it must be unconfigured with stm32_unconfiggpio() with
* the same cfgset first before it can be set to non-alternative function.
*
* Returned Value:
* OK on success
* ERROR on invalid port, or when pin is locked as ALT function.
*
************************************************************************************/
int stm32_configgpio(uint32_t cfgset);
/************************************************************************************
* Name: stm32_unconfiggpio
*
* Description:
* Unconfigure a GPIO pin based on bit-encoded description of the pin, set it
* into default HiZ state (and possibly mark it's unused) and unlock it whether
* it was previously selected as alternative function (GPIO_ALT|GPIO_CNF_AFPP|...).
*
* This is a safety function and prevents hardware from schocks, as unexpected
* write to the Timer Channel Output GPIO to fixed '1' or '0' while it should
* operate in PWM mode could produce excessive on-board currents and trigger
* over-current/alarm function.
*
* Returned Value:
* OK on success
* ERROR on invalid port
*
************************************************************************************/
int stm32_unconfiggpio(uint32_t cfgset);
/************************************************************************************
* Name: stm32_gpiowrite
*
* Description:
* Write one or zero to the selected GPIO pin
*
************************************************************************************/
void stm32_gpiowrite(uint32_t pinset, bool value);
/************************************************************************************
* Name: stm32_gpioread
*
* Description:
* Read one or zero from the selected GPIO pin
*
************************************************************************************/
bool stm32_gpioread(uint32_t pinset);
/****************************************************************************
* Name: stm32_gpiosetevent
*
* Description:
* Sets/clears GPIO based event and interrupt triggers.
*
* Input Parameters:
* - pinset: GPIO pin configuration
* - risingedge: Enables interrupt on rising edges
* - fallingedge: Enables interrupt on falling edges
* - event: Generate event when set
* - func: When non-NULL, generate interrupt
* - arg: Argument passed to the interrupt callback
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure indicating the
* nature of the failure.
*
************************************************************************************/
int stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge,
bool event, xcpt_t func, void *arg);
/************************************************************************************
* Function: stm32_dumpgpio
*
* Description:
* Dump all GPIO registers associated with the provided base address
*
************************************************************************************/
#ifdef CONFIG_DEBUG_GPIO_INFO
int stm32_dumpgpio(uint32_t pinset, const char *msg);
#else
# define stm32_dumpgpio(p,m)
#endif
/************************************************************************************
* Function: stm32_gpioinit
*
* Description:
* Based on configuration within the .config file, it does:
* - Remaps positions of alternative functions.
*
* Typically called from stm32_start().
*
************************************************************************************/
void stm32_gpioinit(void);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_SRC_STM32H7_STM32_GPIO_H */