stm32l1xx_gpio.rar_stm32l1xx

/** ****************************************************************************** * @file stm32l1xx_gpio.c * @author MCD Application Team * @version V1.1.0 * @date 24-January-2012 * @brief This file provides firmware functions to manage the following * functionalities of the GPIO peripheral: * + Initialization and Configuration * + GPIO Read and Write * + GPIO Alternate functions configuration * * @verbatim =========================================================================== ##### How to use this driver ##### =========================================================================== [..] (#) Enable the GPIO AHB clock using RCC_AHBPeriphClockCmd() (#) Configure the GPIO pin(s) using GPIO_Init() Four possible configuration are available for each pin: (++) Input: Floating, Pull-up, Pull-down. (++) Output: Push-Pull (Pull-up, Pull-down or no Pull) Open Drain (Pull-up, Pull-down or no Pull). In output mode, the speed is configurable: Very Low, Low, Medium or High. (++) Alternate Function: Push-Pull (Pull-up, Pull-down or no Pull) Open Drain (Pull-up, Pull-down or no Pull). (++) Analog: required mode when a pin is to be used as ADC channel, DAC output or comparator input. (#) Peripherals alternate function: (++) For ADC, DAC and comparators, configure the desired pin in analog mode using GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AN (++) For other peripherals (TIM, USART...): (+++) Connect the pin to the desired peripherals' Alternate Function (AF) using GPIO_PinAFConfig() function. (+++) Configure the desired pin in alternate function mode using GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF (+++) Select the type, pull-up/pull-down and output speed via GPIO_PuPd, GPIO_OType and GPIO_Speed members. (+++) Call GPIO_Init() function. (#) To get the level of a pin configured in input mode use GPIO_ReadInputDataBit() (#) To set/reset the level of a pin configured in output mode use GPIO_SetBits()/GPIO_ResetBits() (#) 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 * ****************************************************************************** * @attention * * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. * * FOR MORE INFORMATION PLEASE READ CAREFULLY THE LICENSE AGREEMENT FILE * LOCATED IN THE ROOT DIRECTORY OF THIS FIRMWARE PACKAGE. * * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2> ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "stm32l1xx_gpio.h" #include "stm32l1xx_rcc.h" /** @addtogroup STM32L1xx_StdPeriph_Driver * @{ */ /** @defgroup GPIO * @brief GPIO driver modules * @{ */ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ /** @defgroup GPIO_Private_Functions * @{ */ /** @defgroup GPIO_Group1 Initialization and Configuration * @brief Initialization and Configuration * @verbatim =============================================================================== ##### Initialization and Configuration ##### =============================================================================== @endverbatim * @{ */ /** * @brief Deinitializes the GPIOx peripheral registers to their default reset * values. * By default, The GPIO pins are configured in input floating mode * (except JTAG pins). * @param GPIOx: where x can be (A..H) to select the GPIO peripheral. * @retval None */ void GPIO_DeInit(GPIO_TypeDef* GPIOx) { /* Check the parameters */ assert_param(IS_GPIO_ALL_PERIPH(GPIOx)); if(GPIOx == GPIOA) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOA, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOA, DISABLE); } else if(GPIOx == GPIOB) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOB, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOB, DISABLE); } else if(GPIOx == GPIOC) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOC, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOC, DISABLE); } else if(GPIOx == GPIOD) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOD, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOD, DISABLE); } else if(GPIOx == GPIOE) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOE, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOE, DISABLE); } else if(GPIOx == GPIOF) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOF, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOF, DISABLE); } else if(GPIOx == GPIOG) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOG, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOG, DISABLE); } else { if(GPIOx == GPIOH) { RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOH, ENABLE); RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOH, DISABLE); } } } /** * @brief Initializes the GPIOx peripheral according to the specified * parameters in the GPIO_InitStruct. * @param GPIOx: where x can be (A..H) to select the GPIO peripheral. * @param GPIO_InitStruct: pointer to a GPIO_InitTypeDef structure that * contains the configuration information for the specified GPIO * peripheral. * @retval None */ void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct) { uint32_t pinpos = 0x00, pos = 0x00 , currentpin = 0x00; /* Check the parameters */ assert_param(IS_GPIO_ALL_PERIPH(GPIOx)); assert_param(IS_GPIO_PIN(GPIO_InitStruct->GPIO_Pin)); assert_param(IS_GPIO_MODE(GPIO_InitStruct->GPIO_Mode)); assert_param(IS_GPIO_PUPD(GPIO_InitStruct->GPIO_PuPd)); /* -------------------------Configure the port pins---------------- */ /*-- GPIO Mode Configuration --*/ for (pinpos = 0x00; pinpos < 0x10; pinpos++) { pos = ((uint32_t)0x01) << pinpos; /* Get the port pins position */ currentpin = (GPIO_InitStruct->GPIO_Pin) & pos; if (currentpin == pos) { GPIOx->MODER &= ~(GPIO_MODER_MODER0 << (pinpos * 2));