sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
96d6bc9376
nuttx/arch/arm/src/stm32/stm32_gpio.c

794 lines
22 KiB
C
Raw Blame History

/****************************************************************************
* arch/arm/src/stm32/stm32_gpio.c
*
* Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2011 Uros Platise. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
* Uros Platise <uros.platise@isotel.eu>
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include "up_arch.h"
#include "chip.h"
#include "stm32_gpio.h"
#if defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F20XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F33XX) || \
defined(CONFIG_STM32_STM32F37XX) || defined(CONFIG_STM32_STM32F4XXX)
# include "chip/stm32_syscfg.h"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/* Base addresses for each GPIO block */
const uint32_t g_gpiobase[STM32_NGPIO_PORTS] =
{
#if STM32_NGPIO_PORTS > 0
STM32_GPIOA_BASE,
#endif
#if STM32_NGPIO_PORTS > 1
STM32_GPIOB_BASE,
#endif
#if STM32_NGPIO_PORTS > 2
STM32_GPIOC_BASE,
#endif
#if STM32_NGPIO_PORTS > 3
STM32_GPIOD_BASE,
#endif
#if STM32_NGPIO_PORTS > 4
STM32_GPIOE_BASE,
#endif
#if defined(CONFIG_STM32_STM32L15XX)
#if STM32_NGPIO_PORTS > 5
STM32_GPIOH_BASE,
#endif
#if STM32_NGPIO_PORTS > 6
STM32_GPIOF_BASE,
#endif
#if STM32_NGPIO_PORTS > 7
STM32_GPIOG_BASE,
#endif
#else
#if STM32_NGPIO_PORTS > 5
STM32_GPIOF_BASE,
#endif
#if STM32_NGPIO_PORTS > 6
STM32_GPIOG_BASE,
#endif
#if STM32_NGPIO_PORTS > 7
STM32_GPIOH_BASE,
#endif
#if STM32_NGPIO_PORTS > 8
STM32_GPIOI_BASE,
#endif
#if STM32_NGPIO_PORTS > 9
STM32_GPIOJ_BASE,
#endif
#if STM32_NGPIO_PORTS > 10
STM32_GPIOK_BASE,
#endif
#endif /* CONFIG_STM32_STM32L15XX */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: stm32_gpioremap
*
* Description:
*
* Based on configuration within the .config file, this function will
* remaps positions of alternative functions.
*
****************************************************************************/
static inline void stm32_gpioremap(void)
{
#if defined(CONFIG_STM32_STM32F10XX)
/* Remap according to the configuration within .config file */
uint32_t val = 0;
#ifdef CONFIG_STM32_SPI1_REMAP
val |= AFIO_MAPR_SPI1_REMAP;
#endif
#ifdef CONFIG_STM32_SPI3_REMAP
val |= AFIO_MAPR_SPI3_REMAP;
#endif
#ifdef CONFIG_STM32_I2C1_REMAP
val |= AFIO_MAPR_I2C1_REMAP;
#endif
#ifdef CONFIG_STM32_USART1_REMAP
val |= AFIO_MAPR_USART1_REMAP;
#endif
#ifdef CONFIG_STM32_USART2_REMAP
val |= AFIO_MAPR_USART2_REMAP;
#endif
#ifdef CONFIG_STM32_USART3_FULL_REMAP
val |= AFIO_MAPR_USART3_FULLREMAP;
#endif
#ifdef CONFIG_STM32_USART3_PARTIAL_REMAP
val |= AFIO_MAPR_USART3_PARTREMAP;
#endif
#ifdef CONFIG_STM32_TIM1_FULL_REMAP
val |= AFIO_MAPR_TIM1_FULLREMAP;
#endif
#ifdef CONFIG_STM32_TIM1_PARTIAL_REMAP
val |= AFIO_MAPR_TIM1_PARTREMAP;
#endif
#ifdef CONFIG_STM32_TIM2_FULL_REMAP
val |= AFIO_MAPR_TIM2_FULLREMAP;
#endif
#ifdef CONFIG_STM32_TIM2_PARTIAL_REMAP_1
val |= AFIO_MAPR_TIM2_PARTREMAP1;
#endif
#ifdef CONFIG_STM32_TIM2_PARTIAL_REMAP_2
val |= AFIO_MAPR_TIM2_PARTREMAP2;
#endif
#ifdef CONFIG_STM32_TIM3_FULL_REMAP
val |= AFIO_MAPR_TIM3_FULLREMAP;
#endif
#ifdef CONFIG_STM32_TIM3_PARTIAL_REMAP
val |= AFIO_MAPR_TIM3_PARTREMAP;
#endif
#ifdef CONFIG_STM32_TIM4_REMAP
val |= AFIO_MAPR_TIM4_REMAP;
#endif
#ifdef CONFIG_STM32_CAN1_REMAP1
val |= AFIO_MAPR_PB89;
#endif
#ifdef CONFIG_STM32_CAN1_REMAP2
val |= AFIO_MAPR_PD01;
#endif
#ifdef CONFIG_STM32_CAN2_REMAP /* Connectivity line only */
val |= AFIO_MAPR_CAN2_REMAP;
#endif
#ifdef CONFIG_STM32_ETH_REMAP /* Connectivity line only */
val |= AFIO_MAPR_ETH_REMAP;
#endif
#ifdef CONFIG_STM32_JTAG_FULL_ENABLE
/* The reset default */
#elif defined(CONFIG_STM32_JTAG_NOJNTRST_ENABLE)
val |= AFIO_MAPR_SWJ; /* enabled but without JNTRST */
#elif defined(CONFIG_STM32_JTAG_SW_ENABLE)
val |= AFIO_MAPR_SWDP; /* set JTAG-DP disabled and SW-DP enabled */
#else
val |= AFIO_MAPR_DISAB; /* set JTAG-DP and SW-DP Disabled */
#endif
putreg32(val, STM32_AFIO_MAPR);
#endif
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: stm32_gpioinit
*
* Description:
* Based on configuration within the .config file, it does:
* - Remaps positions of alternative functions.
*
* Typically called from stm32_start().
*
* Assumptions:
* This function is called early in the initialization sequence so that
* no mutual exlusion is necessary.
*
****************************************************************************/
void stm32_gpioinit(void)
{
/* Remap according to the configuration within .config file */
stm32_gpioremap();
}
/****************************************************************************
* 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.
*
* Returns:
* OK on success
* A negated errono valu on invalid port, or when pin is locked as ALT
* function.
*
* To-Do: Auto Power Enable
****************************************************************************/
/****************************************************************************
* Name: stm32_configgpio (for the STM32F10xxx family)
****************************************************************************/
#if defined(CONFIG_STM32_STM32F10XX)
int stm32_configgpio(uint32_t cfgset)
{
uint32_t base;
uint32_t cr;
uint32_t regval;
uint32_t regaddr;
unsigned int port;
unsigned int pin;
unsigned int pos;
unsigned int modecnf;
irqstate_t flags;
bool input;
/* Verify that this hardware supports the select GPIO port */
port = (cfgset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port >= STM32_NGPIO_PORTS)
{
return -EINVAL;
}
/* Get the port base address */
base = g_gpiobase[port];
/* Get the pin number and select the port configuration register for that
* pin
*/
pin = (cfgset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
if (pin < 8)
{
cr = base + STM32_GPIO_CRL_OFFSET;
pos = pin;
}
else
{
cr = base + STM32_GPIO_CRH_OFFSET;
pos = pin - 8;
}
/* Input or output? */
input = ((cfgset & GPIO_INPUT) != 0);
/* Interrupts must be disabled from here on out so that we have mutually
* exclusive access to all of the GPIO configuration registers.
*/
flags = enter_critical_section();
/* Decode the mode and configuration */
regval = getreg32(cr);
if (input)
{
/* Input.. force mode = INPUT */
modecnf = 0;
}
else
{
/* Output or alternate function */
modecnf = (cfgset & GPIO_MODE_MASK) >> GPIO_MODE_SHIFT;
}
modecnf |= ((cfgset & GPIO_CNF_MASK) >> GPIO_CNF_SHIFT) << 2;
/* Set the port configuration register */
regval &= ~(GPIO_CR_MODECNF_MASK(pos));
regval |= (modecnf << GPIO_CR_MODECNF_SHIFT(pos));
putreg32(regval, cr);
/* Set or reset the corresponding BRR/BSRR bit */
if (!input)
{
/* It is an output or an alternate function. We have to look at the CNF
* bits to know which.
*/
unsigned int cnf = (cfgset & GPIO_CNF_MASK);
if (cnf != GPIO_CNF_OUTPP && cnf != GPIO_CNF_OUTOD)
{
/* Its an alternate function pin... we can return early */
leave_critical_section(flags);
return OK;
}
}
else
{
/* It is an input pin... Should it configured as an EXTI interrupt? */
if ((cfgset & GPIO_EXTI) != 0)
{
int shift;
/* Yes.. Set the bits in the EXTI CR register */
regaddr = STM32_AFIO_EXTICR(pin);
regval = getreg32(regaddr);
shift = AFIO_EXTICR_EXTI_SHIFT(pin);
regval &= ~(AFIO_EXTICR_PORT_MASK << shift);
regval |= (((uint32_t)port) << shift);
putreg32(regval, regaddr);
}
if ((cfgset & GPIO_CNF_MASK) != GPIO_CNF_INPULLUD)
{
/* Neither... we can return early */
leave_critical_section(flags);
return OK;
}
}
/* If it is an output... set the pin to the correct initial state.
* If it is pull-down or pull up, then we need to set the ODR
* appropriately for that function.
*/
if ((cfgset & GPIO_OUTPUT_SET) != 0)
{
/* Use the BSRR register to set the output */
regaddr = base + STM32_GPIO_BSRR_OFFSET;
}
else
{
/* Use the BRR register to clear */
regaddr = base + STM32_GPIO_BRR_OFFSET;
}
regval = getreg32(regaddr);
regval |= (1 << pin);
putreg32(regval, regaddr);
leave_critical_section(flags);
return OK;
}
#endif
/****************************************************************************
* Name: stm32_configgpio (for the STM32L15xxx, STM32F20xxx and STM32F40xxx family)
****************************************************************************/
#if defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F20XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F33XX) || \
defined(CONFIG_STM32_STM32F37XX) || defined(CONFIG_STM32_STM32F4XXX)
int stm32_configgpio(uint32_t cfgset)
{
uintptr_t base;
uint32_t regval;
uint32_t setting;
unsigned int regoffset;
unsigned int port;
unsigned int pin;
unsigned int pos;
unsigned int pinmode;
irqstate_t flags;
/* Verify that this hardware supports the select GPIO port */
port = (cfgset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port >= STM32_NGPIO_PORTS)
{
return -EINVAL;
}
/* Get the port base address */
base = g_gpiobase[port];
/* Get the pin number and select the port configuration register for that
* pin
*/
pin = (cfgset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
/* Set up the mode register (and remember whether the pin mode) */
switch (cfgset & GPIO_MODE_MASK)
{
default:
case GPIO_INPUT: /* Input mode */
pinmode = GPIO_MODER_INPUT;
break;
case GPIO_OUTPUT: /* General purpose output mode */
stm32_gpiowrite(cfgset, (cfgset & GPIO_OUTPUT_SET) != 0); /* Set the initial output value */
pinmode = GPIO_MODER_OUTPUT;
break;
case GPIO_ALT: /* Alternate function mode */
pinmode = GPIO_MODER_ALT;
break;
case GPIO_ANALOG: /* Analog mode */
pinmode = GPIO_MODER_ANALOG;
break;
}
/* Interrupts must be disabled from here on out so that we have mutually
* exclusive access to all of the GPIO configuration registers.
*/
flags = enter_critical_section();
/* Now apply the configuration to the mode register */
regval = getreg32(base + STM32_GPIO_MODER_OFFSET);
regval &= ~GPIO_MODER_MASK(pin);
regval |= ((uint32_t)pinmode << GPIO_MODER_SHIFT(pin));
putreg32(regval, base + STM32_GPIO_MODER_OFFSET);
/* Set up the pull-up/pull-down configuration (all but analog pins) */
setting = GPIO_PUPDR_NONE;
if (pinmode != GPIO_MODER_ANALOG)
{
switch (cfgset & GPIO_PUPD_MASK)
{
default:
case GPIO_FLOAT: /* No pull-up, pull-down */
break;
case GPIO_PULLUP: /* Pull-up */
setting = GPIO_PUPDR_PULLUP;
break;
case GPIO_PULLDOWN: /* Pull-down */
setting = GPIO_PUPDR_PULLDOWN;
break;
}
}
regval = getreg32(base + STM32_GPIO_PUPDR_OFFSET);
regval &= ~GPIO_PUPDR_MASK(pin);
regval |= (setting << GPIO_PUPDR_SHIFT(pin));
putreg32(regval, base + STM32_GPIO_PUPDR_OFFSET);
/* Set the alternate function (Only alternate function pins) */
if (pinmode == GPIO_MODER_ALT)
{
setting = (cfgset & GPIO_AF_MASK) >> GPIO_AF_SHIFT;
}
else
{
setting = 0;
}
if (pin < 8)
{
regoffset = STM32_GPIO_AFRL_OFFSET;
pos = pin;
}
else
{
regoffset = STM32_GPIO_AFRH_OFFSET;
pos = pin - 8;
}
regval = getreg32(base + regoffset);
regval &= ~GPIO_AFR_MASK(pos);
regval |= (setting << GPIO_AFR_SHIFT(pos));
putreg32(regval, base + regoffset);
/* Set speed (Only outputs and alternate function pins) */
if (pinmode == GPIO_MODER_OUTPUT || pinmode == GPIO_MODER_ALT)
{
switch (cfgset & GPIO_SPEED_MASK)
{
#if defined(CONFIG_STM32_STM32L15XX)
default:
case GPIO_SPEED_400KHz: /* 400 kHz Very low speed ouput */
setting = GPIO_OSPEED_400KHz;
break;
case GPIO_SPEED_2MHz: /* 2 MHz Low speed ouput */
setting = GPIO_OSPEED_2MHz;
break;
case GPIO_SPEED_10MHz: /* 10 MHz Medium speed ouput */
setting = GPIO_OSPEED_10MHz;
break;
case GPIO_SPEED_40MHz: /* 40 MHz High speed ouput */
setting = GPIO_OSPEED_40MHz;
break;
#else
default:
case GPIO_SPEED_2MHz: /* 2 MHz Low speed output */
setting = GPIO_OSPEED_2MHz;
break;
case GPIO_SPEED_25MHz: /* 25 MHz Medium speed output */
setting = GPIO_OSPEED_25MHz;
break;
case GPIO_SPEED_50MHz: /* 50 MHz Fast speed output */
setting = GPIO_OSPEED_50MHz;
break;
#if !defined(CONFIG_STM32_STM32F30XX) && !defined(CONFIG_STM32_STM32F33XX) && \
!defined(CONFIG_STM32_STM32F37XX)
case GPIO_SPEED_100MHz: /* 100 MHz High speed output */
setting = GPIO_OSPEED_100MHz;
break;
#endif
#endif
}
}
else
{
setting = 0;
}
regval = getreg32(base + STM32_GPIO_OSPEED_OFFSET);
regval &= ~GPIO_OSPEED_MASK(pin);
regval |= (setting << GPIO_OSPEED_SHIFT(pin));
putreg32(regval, base + STM32_GPIO_OSPEED_OFFSET);
/* Set push-pull/open-drain (Only outputs and alternate function pins) */
regval = getreg32(base + STM32_GPIO_OTYPER_OFFSET);
setting = GPIO_OTYPER_OD(pin);
if ((pinmode == GPIO_MODER_OUTPUT || pinmode == GPIO_MODER_ALT) &&
(cfgset & GPIO_OPENDRAIN) != 0)
{
regval |= setting;
}
else
{
regval &= ~setting;
}
putreg32(regval, base + STM32_GPIO_OTYPER_OFFSET);
/* Otherwise, it is an input pin. Should it configured as an EXTI interrupt? */
if (pinmode != GPIO_MODER_OUTPUT && (cfgset & GPIO_EXTI) != 0)
{
/* "In STM32 F1 the selection of the EXTI line source is performed through
* the EXTIx bits in the AFIO_EXTICRx registers, while in F2 series this
* selection is done through the EXTIx bits in the SYSCFG_EXTICRx registers.
*
* "Only the mapping of the EXTICRx registers has been changed, without any
* changes to the meaning of the EXTIx bits. However, the range of EXTI
* bits values has been extended to 0b1000 to support the two ports added
* in F2, port H and I (in F1 series the maximum value is 0b0110)."
*/
uint32_t regaddr;
int shift;
/* Set the bits in the SYSCFG EXTICR register */
regaddr = STM32_SYSCFG_EXTICR(pin);
regval = getreg32(regaddr);
shift = SYSCFG_EXTICR_EXTI_SHIFT(pin);
regval &= ~(SYSCFG_EXTICR_PORT_MASK << shift);
regval |= (((uint32_t)port) << shift);
putreg32(regval, regaddr);
}
leave_critical_section(flags);
return OK;
}
#endif
/****************************************************************************
* 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 previsouly 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.
*
* Returns:
* OK on success
* A negated errno value on invalid port
*
* To-Do: Auto Power Disable
****************************************************************************/
int stm32_unconfiggpio(uint32_t cfgset)
{
/* Reuse port and pin number and set it to default HiZ INPUT */
cfgset &= GPIO_PORT_MASK | GPIO_PIN_MASK;
#if defined(CONFIG_STM32_STM32F10XX)
cfgset |= GPIO_INPUT | GPIO_CNF_INFLOAT | GPIO_MODE_INPUT;
#elif defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F20XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F33XX) || \
defined(CONFIG_STM32_STM32F37XX) || defined(CONFIG_STM32_STM32F4XXX)
cfgset |= GPIO_INPUT | GPIO_FLOAT;
#else
# error "Unsupported STM32 chip"
#endif
/* To-Do: Mark its unuse for automatic power saving options */
return stm32_configgpio(cfgset);
}
/****************************************************************************
* Name: stm32_gpiowrite
*
* Description:
* Write one or zero to the selected GPIO pin
*
****************************************************************************/
void stm32_gpiowrite(uint32_t pinset, bool value)
{
uint32_t base;
#if defined(CONFIG_STM32_STM32F10XX)
uint32_t offset;
#elif defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F20XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F33XX) || \
defined(CONFIG_STM32_STM32F37XX) || defined(CONFIG_STM32_STM32F4XXX)
uint32_t bit;
#endif
unsigned int port;
unsigned int pin;
port = (pinset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port < STM32_NGPIO_PORTS)
{
/* Get the port base address */
base = g_gpiobase[port];
/* Get the pin number */
pin = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
/* Set or clear the output on the pin */
#if defined(CONFIG_STM32_STM32F10XX)
if (value)
{
offset = STM32_GPIO_BSRR_OFFSET;
}
else
{
offset = STM32_GPIO_BRR_OFFSET;
}
putreg32((1 << pin), base + offset);
#elif defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F20XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F33XX) || \
defined(CONFIG_STM32_STM32F37XX) || defined(CONFIG_STM32_STM32F4XXX)
if (value)
{
bit = GPIO_BSRR_SET(pin);
}
else
{
bit = GPIO_BSRR_RESET(pin);
}
putreg32(bit, base + STM32_GPIO_BSRR_OFFSET);
#else
# error "Unsupported STM32 chip"
#endif
}
}
/****************************************************************************
* Name: stm32_gpioread
*
* Description:
* Read one or zero from the selected GPIO pin
*
****************************************************************************/
bool stm32_gpioread(uint32_t pinset)
{
uint32_t base;
unsigned int port;
unsigned int pin;
port = (pinset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port < STM32_NGPIO_PORTS)
{
/* Get the port base address */
base = g_gpiobase[port];
/* Get the pin number and return the input state of that pin */
pin = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
return ((getreg32(base + STM32_GPIO_IDR_OFFSET) & (1 << pin)) != 0);
}
return 0;
}
Reference in New Issue View Git Blame Copy Permalink