| /** |
| ****************************************************************************** |
| * @file stm32l0xx_hal_gpio.c |
| * @author MCD Application Team |
| * @brief GPIO HAL module driver. |
| * This file provides firmware functions to manage the following |
| * functionalities of the General Purpose Input/Output (GPIO) peripheral: |
| * + Initialization and de-initialization functions |
| * + IO operation functions |
| * |
| ****************************************************************************** |
| * @attention |
| * |
| * Copyright (c) 2016 STMicroelectronics. |
| * All rights reserved. |
| * |
| * This software is licensed under terms that can be found in the LICENSE file |
| * in the root directory of this software component. |
| * If no LICENSE file comes with this software, it is provided AS-IS. |
| * |
| ****************************************************************************** |
| @verbatim |
| ============================================================================== |
| ##### GPIO Peripheral features ##### |
| ============================================================================== |
| [..] |
| (+) Each port bit of the general-purpose I/O (GPIO) ports can be individually |
| configured by software in several modes: |
| (++) Input mode |
| (++) Analog mode |
| (++) Output mode |
| (++) Alternate function mode |
| (++) External interrupt/event lines |
| |
| (+) During and just after reset, the alternate functions and external interrupt |
| lines are not active and the I/O ports are configured in input floating mode. |
| |
| (+) All GPIO pins have weak internal pull-up and pull-down resistors, which can be |
| activated or not. |
| |
| (+) In Output or Alternate mode, each IO can be configured on open-drain or push-pull |
| type and the IO speed can be selected depending on the VDD value. |
| |
| (+) The microcontroller IO pins are connected to onboard peripherals/modules through a |
| multiplexer that allows only one peripheral alternate function (AF) connected |
| to an IO pin at a time. In this way, there can be no conflict between peripherals |
| sharing the same IO pin. |
| |
| (+) All ports have external interrupt/event capability. To use external interrupt |
| lines, the port must be configured in input mode. All available GPIO pins are |
| connected to the 16 external interrupt/event lines from EXTI0 to EXTI15. |
| |
| (+) The external interrupt/event controller consists of up to 28 edge detectors |
| (16 lines are connected to GPIO) for generating event/interrupt requests (each |
| input line can be independently configured to select the type (interrupt or event) |
| and the corresponding trigger event (rising or falling or both). Each line can |
| also be masked independently. |
| |
| ##### How to use this driver ##### |
| ============================================================================== |
| [..] |
| (#) Enable the GPIO IOPORT clock using the following function: __HAL_RCC_GPIOx_CLK_ENABLE(). |
| |
| (#) Configure the GPIO pin(s) using HAL_GPIO_Init(). |
| (++) Configure the IO mode using "Mode" member from GPIO_InitTypeDef structure |
| (++) Activate Pull-up, Pull-down resistor using "Pull" member from GPIO_InitTypeDef |
| structure. |
| (++) In case of Output or alternate function mode selection: the speed is |
| configured through "Speed" member from GPIO_InitTypeDef structure. |
| (++) In alternate mode is selection, the alternate function connected to the IO |
| is configured through "Alternate" member from GPIO_InitTypeDef structure. |
| (++) Analog mode is required when a pin is to be used as ADC channel |
| or DAC output. |
| (++) In case of external interrupt/event selection the "Mode" member from |
| GPIO_InitTypeDef structure select the type (interrupt or event) and |
| the corresponding trigger event (rising or falling or both). |
| |
| (#) In case of external interrupt/event mode selection, configure NVIC IRQ priority |
| mapped to the EXTI line using HAL_NVIC_SetPriority() and enable it using |
| HAL_NVIC_EnableIRQ(). |
| |
| (#) HAL_GPIO_DeInit allows to set register values to their reset value. This function |
| is also to be used when unconfiguring pin which was used as an external interrupt |
| or in event mode. That is the only way to reset the corresponding bit in |
| EXTI & SYSCFG registers. |
| |
| (#) To get the level of a pin configured in input mode use HAL_GPIO_ReadPin(). |
| |
| (#) To set/reset the level of a pin configured in output mode use |
| HAL_GPIO_WritePin()/HAL_GPIO_TogglePin(). |
| |
| (#) To lock pin configuration until next reset use HAL_GPIO_LockPin(). |
| |
| (#) During and just after reset, the alternate functions are not |
| active and the GPIO pins are configured in input floating mode (except JTAG |
| pins). |
| |
| (#) The LSE oscillator pins OSC32_IN and OSC32_OUT can be used as general purpose |
| (PC14 and PC15, respectively) when the LSE oscillator is off. The LSE has |
| priority over the GPIO function. |
| |
| (#) The HSE oscillator pins OSC_IN/OSC_OUT can be used as |
| general purpose PH0 and PH1, respectively, when the HSE oscillator is off. |
| The HSE has priority over the GPIO function. |
| |
| @endverbatim |
| ****************************************************************************** |
| */ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32l0xx_hal.h" |
| |
| /** @addtogroup STM32L0xx_HAL_Driver |
| * @{ |
| */ |
| |
| #ifdef HAL_GPIO_MODULE_ENABLED |
| |
| /** @addtogroup GPIO |
| * @brief GPIO HAL module driver |
| * @{ |
| */ |
| |
| /* Private define ------------------------------------------------------------*/ |
| /** @addtogroup GPIO_Private |
| * @{ |
| */ |
| #define GPIO_NUMBER (16U) |
| /** |
| * @} |
| */ |
| /** @addtogroup GPIO_Exported_Functions |
| * @{ |
| */ |
| |
| /** @addtogroup GPIO_Exported_Functions_Group1 |
| * @brief Initialization and de-initialization functions |
| * |
| @verbatim |
| =============================================================================== |
| ##### Initialization and de-initialization functions ##### |
| =============================================================================== |
| |
| @endverbatim |
| * @{ |
| */ |
| |
| /** |
| * @brief Initializes the GPIOx peripheral according to the specified parameters in the GPIO_Init. |
| * @param GPIOx where x can be (A..E and H) to select the GPIO peripheral for STM32L0XX family devices. |
| * Note that GPIOE is not available on all devices. |
| * @param GPIO_Init pointer to a GPIO_InitTypeDef structure that contains |
| * the configuration information for the specified GPIO peripheral. |
| * @retval None |
| */ |
| void HAL_GPIO_Init(GPIO_TypeDef *GPIOx, GPIO_InitTypeDef *GPIO_Init) |
| { |
| uint32_t position = 0x00U; |
| uint32_t iocurrent = 0x00U; |
| uint32_t temp = 0x00U; |
| |
| /* Check the parameters */ |
| assert_param(IS_GPIO_MODE(GPIO_Init->Mode)); |
| assert_param(IS_GPIO_PIN_AVAILABLE(GPIOx, (GPIO_Init->Pin))); |
| |
| /* Configure the port pins */ |
| while (((GPIO_Init->Pin) >> position) != 0) |
| { |
| /* Get the IO position */ |
| iocurrent = (GPIO_Init->Pin) & (1U << position); |
| |
| if (iocurrent) |
| { |
| /*--------------------- GPIO Mode Configuration ------------------------*/ |
| /* In case of Output or Alternate function mode selection */ |
| if (((GPIO_Init->Mode & GPIO_MODE) == MODE_OUTPUT) || |
| ((GPIO_Init->Mode & GPIO_MODE) == MODE_AF)) |
| { |
| /* Check the Speed parameter */ |
| assert_param(IS_GPIO_SPEED(GPIO_Init->Speed)); |
| /* Configure the IO Speed */ |
| temp = GPIOx->OSPEEDR; |
| temp &= ~(GPIO_OSPEEDER_OSPEED0 << (position * 2U)); |
| temp |= (GPIO_Init->Speed << (position * 2U)); |
| GPIOx->OSPEEDR = temp; |
| |
| /* Configure the IO Output Type */ |
| temp = GPIOx->OTYPER; |
| temp &= ~(GPIO_OTYPER_OT_0 << position) ; |
| temp |= (((GPIO_Init->Mode & OUTPUT_TYPE) >> OUTPUT_TYPE_Pos) << position); |
| GPIOx->OTYPER = temp; |
| } |
| |
| if ((GPIO_Init->Mode & GPIO_MODE) != MODE_ANALOG) |
| { |
| /* Check the Pull parameter */ |
| assert_param(IS_GPIO_PULL(GPIO_Init->Pull)); |
| |
| /* Activate the Pull-up or Pull down resistor for the current IO */ |
| temp = GPIOx->PUPDR; |
| temp &= ~(GPIO_PUPDR_PUPD0 << (position * 2U)); |
| temp |= ((GPIO_Init->Pull) << (position * 2U)); |
| GPIOx->PUPDR = temp; |
| } |
| |
| /* In case of Alternate function mode selection */ |
| if ((GPIO_Init->Mode & GPIO_MODE) == MODE_AF) |
| { |
| /* Check the Alternate function parameters */ |
| assert_param(IS_GPIO_AF_INSTANCE(GPIOx)); |
| assert_param(IS_GPIO_AF(GPIO_Init->Alternate)); |
| |
| /* Configure Alternate function mapped with the current IO */ |
| temp = GPIOx->AFR[position >> 3U]; |
| temp &= ~(0xFUL << ((uint32_t)(position & 0x07UL) * 4U)); |
| temp |= ((uint32_t)(GPIO_Init->Alternate) << (((uint32_t)position & (uint32_t)0x07U) * 4U)); |
| GPIOx->AFR[position >> 3U] = temp; |
| } |
| |
| /* Configure IO Direction mode (Input, Output, Alternate or Analog) */ |
| temp = GPIOx->MODER; |
| temp &= ~(GPIO_MODER_MODE0 << (position * 2U)); |
| temp |= ((GPIO_Init->Mode & GPIO_MODE) << (position * 2U)); |
| GPIOx->MODER = temp; |
| |
| /*--------------------- EXTI Mode Configuration ------------------------*/ |
| /* Configure the External Interrupt or event for the current IO */ |
| if ((GPIO_Init->Mode & EXTI_MODE) != 0x00U) |
| { |
| /* Enable SYSCFG Clock */ |
| __HAL_RCC_SYSCFG_CLK_ENABLE(); |
| |
| temp = SYSCFG->EXTICR[position >> 2U]; |
| CLEAR_BIT(temp, (0x0FUL) << (4U * (position & 0x03U))); |
| SET_BIT(temp, (GPIO_GET_INDEX(GPIOx)) << (4 * (position & 0x03U))); |
| SYSCFG->EXTICR[position >> 2U] = temp; |
| |
| /* Clear Rising Falling edge configuration */ |
| temp = EXTI->RTSR; |
| temp &= ~((uint32_t)iocurrent); |
| if ((GPIO_Init->Mode & TRIGGER_RISING) != 0x00U) |
| { |
| temp |= iocurrent; |
| } |
| EXTI->RTSR = temp; |
| |
| temp = EXTI->FTSR; |
| temp &= ~((uint32_t)iocurrent); |
| if ((GPIO_Init->Mode & TRIGGER_FALLING) != 0x00U) |
| { |
| temp |= iocurrent; |
| } |
| EXTI->FTSR = temp; |
| |
| temp = EXTI->EMR; |
| temp &= ~((uint32_t)iocurrent); |
| if ((GPIO_Init->Mode & EXTI_EVT) != 0x00U) |
| { |
| temp |= iocurrent; |
| } |
| EXTI->EMR = temp; |
| |
| /* Clear EXTI line configuration */ |
| temp = EXTI->IMR; |
| temp &= ~((uint32_t)iocurrent); |
| if ((GPIO_Init->Mode & EXTI_IT) != 0x00U) |
| { |
| temp |= iocurrent; |
| } |
| EXTI->IMR = temp; |
| } |
| } |
| position++; |
| } |
| } |
| |
| /** |
| * @brief De-initializes the GPIOx peripheral registers to their default reset values. |
| * @param GPIOx where x can be (A..E and H) to select the GPIO peripheral for STM32L0XX family devices. |
| * Note that GPIOE is not available on all devices. |
| * @param GPIO_Pin specifies the port bit to be written. |
| * This parameter can be one of GPIO_PIN_x where x can be (0..15). |
| * All port bits are not necessarily available on all GPIOs. |
| * @retval None |
| */ |
| void HAL_GPIO_DeInit(GPIO_TypeDef *GPIOx, uint32_t GPIO_Pin) |
| { |
| uint32_t position = 0x00U; |
| uint32_t iocurrent = 0x00U; |
| uint32_t tmp = 0x00U; |
| |
| /* Check the parameters */ |
| assert_param(IS_GPIO_PIN_AVAILABLE(GPIOx, GPIO_Pin)); |
| |
| /* Configure the port pins */ |
| while ((GPIO_Pin >> position) != 0) |
| { |
| /* Get the IO position */ |
| iocurrent = (GPIO_Pin) & (1U << position); |
| |
| if (iocurrent) |
| { |
| /*------------------------- EXTI Mode Configuration --------------------*/ |
| /* Clear the External Interrupt or Event for the current IO */ |
| |
| tmp = SYSCFG->EXTICR[position >> 2U]; |
| tmp &= ((0x0FUL) << (4U * (position & 0x03U))); |
| if (tmp == (GPIO_GET_INDEX(GPIOx) << (4U * (position & 0x03U)))) |
| { |
| /* Clear EXTI line configuration */ |
| EXTI->IMR &= ~((uint32_t)iocurrent); |
| EXTI->EMR &= ~((uint32_t)iocurrent); |
| |
| /* Clear Rising Falling edge configuration */ |
| EXTI->FTSR &= ~((uint32_t)iocurrent); |
| EXTI->RTSR &= ~((uint32_t)iocurrent); |
| |
| tmp = (0x0FUL) << (4U * (position & 0x03U)); |
| SYSCFG->EXTICR[position >> 2U] &= ~tmp; |
| } |
| |
| /*------------------------- GPIO Mode Configuration --------------------*/ |
| /* Configure IO Direction in Analog Mode (reset state) */ |
| GPIOx->MODER |= (GPIO_MODE_ANALOG << (position * 2U)); |
| |
| /* Configure the default Alternate Function in current IO */ |
| GPIOx->AFR[position >> 3U] &= ~(0xFUL << ((uint32_t)(position & 0x07UL) * 4U)); |
| |
| /* Deactivate the Pull-up oand Pull-down resistor for the current IO */ |
| GPIOx->PUPDR &= ~(GPIO_PUPDR_PUPD0 << (position * 2U)); |
| |
| /* Configure the default value IO Output Type */ |
| GPIOx->OTYPER &= ~(GPIO_OTYPER_OT_0 << position); |
| |
| /* Configure the default value for IO Speed */ |
| GPIOx->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEED0 << (position * 2U)); |
| } |
| position++; |
| } |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup GPIO_Exported_Functions_Group2 |
| * @brief GPIO Read and Write |
| * |
| @verbatim |
| =============================================================================== |
| ##### IO operation functions ##### |
| =============================================================================== |
| |
| @endverbatim |
| * @{ |
| */ |
| |
| /** |
| * @brief Reads the specified input port pin. |
| * @param GPIOx where x can be (A..E and H) to select the GPIO peripheral for STM32L0xx family devices. |
| * Note that GPIOE is not available on all devices. |
| * @param GPIO_Pin specifies the port bit to read. |
| * This parameter can be GPIO_PIN_x where x can be (0..15). |
| * All port bits are not necessarily available on all GPIOs. |
| * @retval The input port pin value. |
| */ |
| GPIO_PinState HAL_GPIO_ReadPin(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin) |
| { |
| GPIO_PinState bitstatus; |
| |
| /* Check the parameters */ |
| assert_param(IS_GPIO_PIN_AVAILABLE(GPIOx, GPIO_Pin)); |
| |
| if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)GPIO_PIN_RESET) |
| { |
| bitstatus = GPIO_PIN_SET; |
| } |
| else |
| { |
| bitstatus = GPIO_PIN_RESET; |
| } |
| return bitstatus; |
| } |
| |
| /** |
| * @brief Sets or clears the selected data port bit. |
| * |
| * @note This function uses GPIOx_BSRR register to allow atomic read/modify |
| * accesses. In this way, there is no risk of an IRQ occurring between |
| * the read and the modify access. |
| * |
| * @param GPIOx where x can be (A..E and H) to select the GPIO peripheral for STM32L0xx family devices. |
| * Note that GPIOE is not available on all devices. |
| * @param GPIO_Pin specifies the port bit to be written. |
| * This parameter can be one of GPIO_PIN_x where x can be (0..15). |
| * All port bits are not necessarily available on all GPIOs. |
| * @param PinState specifies the value to be written to the selected bit. |
| * This parameter can be one of the GPIO_PinState enum values: |
| * GPIO_PIN_RESET: to clear the port pin |
| * GPIO_PIN_SET: to set the port pin |
| * @retval None |
| */ |
| void HAL_GPIO_WritePin(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, GPIO_PinState PinState) |
| { |
| /* Check the parameters */ |
| assert_param(IS_GPIO_PIN_AVAILABLE(GPIOx, GPIO_Pin)); |
| assert_param(IS_GPIO_PIN_ACTION(PinState)); |
| |
| if (PinState != GPIO_PIN_RESET) |
| { |
| GPIOx->BSRR = GPIO_Pin; |
| } |
| else |
| { |
| GPIOx->BRR = GPIO_Pin ; |
| } |
| } |
| |
| /** |
| * @brief Toggles the specified GPIO pins. |
| * @param GPIOx Where x can be (A..E and H) to select the GPIO peripheral for STM32L0xx family devices. |
| * Note that GPIOE is not available on all devices. |
| * All port bits are not necessarily available on all GPIOs. |
| * @param GPIO_Pin Specifies the pins to be toggled. |
| * @retval None |
| */ |
| void HAL_GPIO_TogglePin(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin) |
| { |
| uint32_t odr; |
| |
| /* Check the parameters */ |
| assert_param(IS_GPIO_PIN_AVAILABLE(GPIOx, GPIO_Pin)); |
| |
| /* get current Output Data Register value */ |
| odr = GPIOx->ODR; |
| |
| /* Set selected pins that were at low level, and reset ones that were high */ |
| GPIOx->BSRR = ((odr & GPIO_Pin) << GPIO_NUMBER) | (~odr & GPIO_Pin); |
| } |
| |
| /** |
| * @brief Locks GPIO Pins configuration registers. |
| * @note The locked registers are GPIOx_MODER, GPIOx_OTYPER, GPIOx_OSPEEDR, |
| * GPIOx_PUPDR, GPIOx_AFRL and GPIOx_AFRH. |
| * @note The configuration of the locked GPIO pins can no longer be modified |
| * until the next reset. |
| * @param GPIOx where x can be (A..E and H) to select the GPIO peripheral for STM32L0xx family. |
| * Note that GPIOE is not available on all devices. |
| * @param GPIO_Pin specifies the port bit to be locked. |
| * This parameter can be any combination of GPIO_Pin_x where x can be (0..15). |
| * All port bits are not necessarily available on all GPIOs. |
| * @retval None |
| */ |
| HAL_StatusTypeDef HAL_GPIO_LockPin(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin) |
| { |
| __IO uint32_t tmp = GPIO_LCKR_LCKK; |
| |
| /* Check the parameters */ |
| assert_param(IS_GPIO_PIN_AVAILABLE(GPIOx, GPIO_Pin)); |
| |
| /* Apply lock key write sequence */ |
| tmp |= GPIO_Pin; |
| /* Set LCKx bit(s): LCKK='1' + LCK[15-0] */ |
| GPIOx->LCKR = tmp; |
| /* Reset LCKx bit(s): LCKK='0' + LCK[15-0] */ |
| GPIOx->LCKR = GPIO_Pin; |
| /* Set LCKx bit(s): LCKK='1' + LCK[15-0] */ |
| GPIOx->LCKR = tmp; |
| /* Read LCKK register. This read is mandatory to complete key lock sequence */ |
| tmp = GPIOx->LCKR; |
| |
| /* read again in order to confirm lock is active */ |
| if ((GPIOx->LCKR & GPIO_LCKR_LCKK) != RESET) |
| { |
| return HAL_OK; |
| } |
| else |
| { |
| return HAL_ERROR; |
| } |
| } |
| /** |
| * @brief This function handles EXTI interrupt request. |
| * @param GPIO_Pin Specifies the pins connected to the EXTI line. |
| * @retval None |
| */ |
| void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin) |
| { |
| /* EXTI line interrupt detected */ |
| if (__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != RESET) |
| { |
| __HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin); |
| HAL_GPIO_EXTI_Callback(GPIO_Pin); |
| } |
| } |
| |
| /** |
| * @brief EXTI line detection callbacks. |
| * @param GPIO_Pin Specifies the pins connected to the EXTI line. |
| * @retval None |
| */ |
| __weak void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) |
| { |
| /* Prevent unused argument(s) compilation warning */ |
| UNUSED(GPIO_Pin); |
| |
| /* NOTE: This function Should not be modified, when the callback is needed, |
| the HAL_GPIO_EXTI_Callback could be implemented in the user file |
| */ |
| } |
| |
| /** |
| * @} |
| */ |
| |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| #endif /* HAL_GPIO_MODULE_ENABLED */ |
| |
| /** |
| * @} |
| */ |
| |
| |
