--- /dev/null
+/**\r
+ ******************************************************************************\r
+ * @file stm32l1xx_gpio.c\r
+ * @author MCD Application Team\r
+ * @version V1.0.0\r
+ * @date 31-December-2010\r
+ * @brief This file provides firmware functions to manage the following \r
+ * functionalities of the GPIO peripheral: \r
+ * - Initialization and Configuration\r
+ * - GPIO Read and Write\r
+ * - GPIO Alternate functions configuration\r
+ * \r
+ * @verbatim\r
+ *\r
+ * ===================================================================\r
+ * How to use this driver\r
+ * =================================================================== \r
+ * 1. Enable the GPIO AHB clock using RCC_AHBPeriphClockCmd()\r
+ * \r
+ * 2. Configure the GPIO pin(s) using GPIO_Init()\r
+ * Four possible configuration are available for each pin:\r
+ * - Input: Floating, Pull-up, Pull-down.\r
+ * - Output: Push-Pull (Pull-up, Pull-down or no Pull)\r
+ * Open Drain (Pull-up, Pull-down or no Pull).\r
+ * In output mode, the speed is configurable: Very Low, Low,\r
+ * Medium or High.\r
+ * - Alternate Function: Push-Pull (Pull-up, Pull-down or no Pull)\r
+ * Open Drain (Pull-up, Pull-down or no Pull).\r
+ * - Analog: required mode when a pin is to be used as ADC channel,\r
+ * DAC output or comparator input.\r
+ * \r
+ * 3- Peripherals alternate function:\r
+ * - For ADC, DAC and comparators, configure the desired pin in \r
+ * analog mode using GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AN\r
+ * - For other peripherals (TIM, USART...):\r
+ * - Connect the pin to the desired peripherals' Alternate \r
+ * Function (AF) using GPIO_PinAFConfig() function\r
+ * - Configure the desired pin in alternate function mode using\r
+ * GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF\r
+ * - Select the type, pull-up/pull-down and output speed via \r
+ * GPIO_PuPd, GPIO_OType and GPIO_Speed members\r
+ * - Call GPIO_Init() function\r
+ * \r
+ * 4. To get the level of a pin configured in input mode use GPIO_ReadInputDataBit()\r
+ * \r
+ * 5. To set/reset the level of a pin configured in output mode use\r
+ * GPIO_SetBits()/GPIO_ResetBits()\r
+ * \r
+ * 6. During and just after reset, the alternate functions are not \r
+ * active and the GPIO pins are configured in input floating mode\r
+ * (except JTAG pins).\r
+ *\r
+ * 7. The LSE oscillator pins OSC32_IN and OSC32_OUT can be used as \r
+ * general-purpose (PC14 and PC15, respectively) when the LSE\r
+ * oscillator is off. The LSE has priority over the GPIO function.\r
+ *\r
+ * 8. The HSE oscillator pins OSC_IN/OSC_OUT can be used as \r
+ * general-purpose PH0 and PH1, respectively, when the HSE \r
+ * oscillator is off. The HSE has priority over the GPIO function.\r
+ * \r
+ * @endverbatim \r
+ *\r
+ ******************************************************************************\r
+ * @attention\r
+ *\r
+ * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS\r
+ * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE\r
+ * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY\r
+ * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING\r
+ * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE\r
+ * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.\r
+ *\r
+ * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>\r
+ ****************************************************************************** \r
+ */ \r
+\r
+/* Includes ------------------------------------------------------------------*/\r
+#include "stm32l1xx_gpio.h"\r
+#include "stm32l1xx_rcc.h"\r
+\r
+/** @addtogroup STM32L1xx_StdPeriph_Driver\r
+ * @{\r
+ */\r
+\r
+/** @defgroup GPIO \r
+ * @brief GPIO driver modules\r
+ * @{\r
+ */\r
+\r
+/* Private typedef -----------------------------------------------------------*/\r
+/* Private define ------------------------------------------------------------*/\r
+/* Private macro -------------------------------------------------------------*/\r
+/* Private variables ---------------------------------------------------------*/\r
+/* Private function prototypes -----------------------------------------------*/\r
+/* Private functions ---------------------------------------------------------*/\r
+\r
+/** @defgroup GPIO_Private_Functions\r
+ * @{\r
+ */\r
+\r
+/** @defgroup GPIO_Group1 Initialization and Configuration\r
+ * @brief Initialization and Configuration\r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ Initialization and Configuration\r
+ =============================================================================== \r
+\r
+@endverbatim\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Deinitializes the GPIOx peripheral registers to their default reset \r
+ * values.\r
+ * By default, The GPIO pins are configured in input floating mode\r
+ * (except JTAG pins).\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @retval None\r
+ */\r
+void GPIO_DeInit(GPIO_TypeDef* GPIOx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+\r
+ if(GPIOx == GPIOA)\r
+ {\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOA, ENABLE);\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOA, DISABLE); \r
+ }\r
+ else if(GPIOx == GPIOB)\r
+ {\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOB, ENABLE);\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOB, DISABLE);\r
+ }\r
+ else if(GPIOx == GPIOC)\r
+ {\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOC, ENABLE);\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOC, DISABLE);\r
+ }\r
+ else if(GPIOx == GPIOD)\r
+ {\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOD, ENABLE);\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOD, DISABLE);\r
+ }\r
+ else if(GPIOx == GPIOE)\r
+ {\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOE, ENABLE);\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOE, DISABLE);\r
+ }\r
+ else\r
+ {\r
+ if(GPIOx == GPIOH)\r
+ {\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOH, ENABLE);\r
+ RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOH, DISABLE);\r
+ }\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Initializes the GPIOx peripheral according to the specified \r
+ * parameters in the GPIO_InitStruct.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_InitStruct: pointer to a GPIO_InitTypeDef structure that \r
+ * contains the configuration information for the specified GPIO\r
+ * peripheral.\r
+ * GPIO_Pin: selects the pin to be configured: GPIO_Pin_0 -> GPIO_Pin_15\r
+ * GPIO_Mode: selects the mode of the pin: \r
+ * - Input mode: GPIO_Mode_IN\r
+ * - Output mode: GPIO_Mode_OUT\r
+ * - Alternate Function mode: GPIO_Mode_AF\r
+ * - Analog mode: GPIO_Mode_AN\r
+ * GPIO_Speed: selects the speed of the pin if configured in Output:\r
+ * - Very Low: GPIO_Speed_400KHz\r
+ * - Low: GPIO_Speed_2MHz\r
+ * - Medium: GPIO_Speed_10MHz\r
+ * - High: GPIO_Speed_40MHz\r
+ * GPIO_OType: selects the Output type (if the selected mode is output):\r
+ * - Push-pull: GPIO_OType_PP\r
+ * - Open Drain: GPIO_OType_OD\r
+ * GPIO_PuPd: configures the Pull-up/Pull-down resistor on the pin:\r
+ * - pull-up: GPIO_PuPd_UP\r
+ * - pull-down: GPIO_PuPd_DOWN\r
+ * - Neither pull-up nor Pull-down: GPIO_PuPd_NOPULL\r
+ * @retval None\r
+ */\r
+void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)\r
+{\r
+ uint32_t pinpos = 0x00, pos = 0x00 , currentpin = 0x00;\r
+ \r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GPIO_PIN(GPIO_InitStruct->GPIO_Pin));\r
+ assert_param(IS_GPIO_MODE(GPIO_InitStruct->GPIO_Mode));\r
+ assert_param(IS_GPIO_PUPD(GPIO_InitStruct->GPIO_PuPd));\r
+\r
+ /* -------------------------Configure the port pins---------------- */\r
+ /*-- GPIO Mode Configuration --*/\r
+ for (pinpos = 0x00; pinpos < 0x10; pinpos++)\r
+ {\r
+ pos = ((uint32_t)0x01) << pinpos;\r
+\r
+ /* Get the port pins position */\r
+ currentpin = (GPIO_InitStruct->GPIO_Pin) & pos;\r
+\r
+ if (currentpin == pos)\r
+ {\r
+ GPIOx->MODER &= ~(GPIO_MODER_MODER0 << (pinpos * 2));\r
+\r
+ GPIOx->MODER |= (((uint32_t)GPIO_InitStruct->GPIO_Mode) << (pinpos * 2));\r
+\r
+ if ((GPIO_InitStruct->GPIO_Mode == GPIO_Mode_OUT) || (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_AF))\r
+ {\r
+ /* Check Speed mode parameters */\r
+ assert_param(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));\r
+\r
+ /* Speed mode configuration */\r
+ GPIOx->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEEDR0 << (pinpos * 2));\r
+ GPIOx->OSPEEDR |= ((uint32_t)(GPIO_InitStruct->GPIO_Speed) << (pinpos * 2));\r
+\r
+ /*Check Output mode parameters */\r
+ assert_param(IS_GPIO_OTYPE(GPIO_InitStruct->GPIO_OType));\r
+\r
+ /* Output mode configuration */\r
+ GPIOx->OTYPER &= ~((GPIO_OTYPER_OT_0) << ((uint16_t)pinpos)) ;\r
+ GPIOx->OTYPER |= (uint16_t)(((uint16_t)GPIO_InitStruct->GPIO_OType) << ((uint16_t)pinpos));\r
+ }\r
+\r
+ /* Pull-up Pull down resistor configuration */\r
+ GPIOx->PUPDR &= ~(GPIO_PUPDR_PUPDR0 << ((uint16_t)pinpos * 2));\r
+ GPIOx->PUPDR |= (((uint32_t)GPIO_InitStruct->GPIO_PuPd) << (pinpos * 2));\r
+ }\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Fills each GPIO_InitStruct member with its default value.\r
+ * @param GPIO_InitStruct : pointer to a GPIO_InitTypeDef structure which will \r
+ * be initialized.\r
+ * @retval None\r
+ */\r
+void GPIO_StructInit(GPIO_InitTypeDef* GPIO_InitStruct)\r
+{\r
+ /* Reset GPIO init structure parameters values */\r
+ GPIO_InitStruct->GPIO_Pin = GPIO_Pin_All;\r
+ GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IN;\r
+ GPIO_InitStruct->GPIO_Speed = GPIO_Speed_400KHz;\r
+ GPIO_InitStruct->GPIO_OType = GPIO_OType_PP;\r
+ GPIO_InitStruct->GPIO_PuPd = GPIO_PuPd_NOPULL;\r
+}\r
+\r
+/**\r
+ * @brief Locks GPIO Pins configuration registers.\r
+ * The locked registers are GPIOx_MODER, GPIOx_OTYPER, GPIOx_OSPEEDR,\r
+ * GPIOx_PUPDR, GPIOx_AFRL and GPIOx_AFRH.\r
+ * The configuration of the locked GPIO pins can no longer be modified\r
+ * until the next reset.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_Pin: specifies the port bit to be written.\r
+ * This parameter can be any combination of GPIO_Pin_x where x can be (0..15).\r
+ * @retval None\r
+ */\r
+void GPIO_PinLockConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)\r
+{\r
+ uint32_t tmp = 0x00010000;\r
+ \r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GPIO_PIN(GPIO_Pin));\r
+ \r
+ tmp |= GPIO_Pin;\r
+ /* Set LCKK bit */\r
+ GPIOx->LCKR = tmp;\r
+ /* Reset LCKK bit */\r
+ GPIOx->LCKR = GPIO_Pin;\r
+ /* Set LCKK bit */\r
+ GPIOx->LCKR = tmp;\r
+ /* Read LCKK bit*/\r
+ tmp = GPIOx->LCKR;\r
+ /* Read LCKK bit*/\r
+ tmp = GPIOx->LCKR;\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup GPIO_Group2 GPIO Read and Write\r
+ * @brief GPIO Read and Write\r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ GPIO Read and Write\r
+ =============================================================================== \r
+\r
+@endverbatim\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Reads the specified input port pin.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_Pin: specifies the port bit to read.\r
+ * This parameter can be GPIO_Pin_x where x can be (0..15).\r
+ * @retval The input port pin value.\r
+ */\r
+uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)\r
+{\r
+ uint8_t bitstatus = 0x00;\r
+ \r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GET_GPIO_PIN(GPIO_Pin));\r
+\r
+ if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)Bit_RESET)\r
+ {\r
+ bitstatus = (uint8_t)Bit_SET;\r
+ }\r
+ else\r
+ {\r
+ bitstatus = (uint8_t)Bit_RESET;\r
+ }\r
+ return bitstatus;\r
+}\r
+\r
+/**\r
+ * @brief Reads the specified GPIO input data port.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @retval GPIO input data port value.\r
+ */\r
+uint16_t GPIO_ReadInputData(GPIO_TypeDef* GPIOx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ \r
+ return ((uint16_t)GPIOx->IDR);\r
+}\r
+\r
+/**\r
+ * @brief Reads the specified output data port bit.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_Pin: Specifies the port bit to read.\r
+ * This parameter can be GPIO_Pin_x where x can be (0..15).\r
+ * @retval The output port pin value.\r
+ */\r
+uint8_t GPIO_ReadOutputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)\r
+{\r
+ uint8_t bitstatus = 0x00;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GET_GPIO_PIN(GPIO_Pin));\r
+ \r
+ if ((GPIOx->ODR & GPIO_Pin) != (uint32_t)Bit_RESET)\r
+ {\r
+ bitstatus = (uint8_t)Bit_SET;\r
+ }\r
+ else\r
+ {\r
+ bitstatus = (uint8_t)Bit_RESET;\r
+ }\r
+ return bitstatus;\r
+}\r
+\r
+/**\r
+ * @brief Reads the specified GPIO output data port.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @retval GPIO output data port value.\r
+ */\r
+uint16_t GPIO_ReadOutputData(GPIO_TypeDef* GPIOx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ \r
+ return ((uint16_t)GPIOx->ODR);\r
+}\r
+\r
+/**\r
+ * @brief Sets the selected data port bits.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_Pin: specifies the port bits to be written.\r
+ * This parameter can be any combination of GPIO_Pin_x where x can be (0..15).\r
+ * @note This functions uses GPIOx_BSRR register to allow atomic read/modify \r
+ * accesses. In this way, there is no risk of an IRQ occurring between\r
+ * the read and the modify access.\r
+ * @retval None\r
+ */\r
+void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GPIO_PIN(GPIO_Pin));\r
+ \r
+ GPIOx->BSRRL = GPIO_Pin;\r
+}\r
+\r
+/**\r
+ * @brief Clears the selected data port bits.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_Pin: specifies the port bits to be written.\r
+ * This parameter can be any combination of GPIO_Pin_x where x can be (0..15).\r
+ * @note This functions uses GPIOx_BSRR register to allow atomic read/modify \r
+ * accesses. In this way, there is no risk of an IRQ occurring between\r
+ * the read and the modify access.\r
+ * @retval None\r
+ */\r
+void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GPIO_PIN(GPIO_Pin));\r
+ \r
+ GPIOx->BSRRH = GPIO_Pin;\r
+}\r
+\r
+/**\r
+ * @brief Sets or clears the selected data port bit.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_Pin: specifies the port bit to be written.\r
+ * This parameter can be one of GPIO_Pin_x where x can be (0..15).\r
+ * @param BitVal: specifies the value to be written to the selected bit.\r
+ * This parameter can be one of the BitAction enum values:\r
+ * @arg Bit_RESET: to clear the port pin\r
+ * @arg Bit_SET: to set the port pin\r
+ * @retval None\r
+ */\r
+void GPIO_WriteBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin, BitAction BitVal)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GET_GPIO_PIN(GPIO_Pin));\r
+ assert_param(IS_GPIO_BIT_ACTION(BitVal));\r
+ \r
+ if (BitVal != Bit_RESET)\r
+ {\r
+ GPIOx->BSRRL = GPIO_Pin;\r
+ }\r
+ else\r
+ {\r
+ GPIOx->BSRRH = GPIO_Pin ;\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Writes data to the specified GPIO data port.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param PortVal: specifies the value to be written to the port output data \r
+ * register.\r
+ * @retval None\r
+ */\r
+void GPIO_Write(GPIO_TypeDef* GPIOx, uint16_t PortVal)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ \r
+ GPIOx->ODR = PortVal;\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup GPIO_Group3 GPIO Alternate functions configuration functions\r
+ * @brief GPIO Alternate functions configuration functions\r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ GPIO Alternate functions configuration functions\r
+ =============================================================================== \r
+\r
+@endverbatim\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Changes the mapping of the specified pin.\r
+ * @param GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral.\r
+ * @param GPIO_PinSource: specifies the pin for the Alternate function.\r
+ * This parameter can be GPIO_PinSourcex where x can be (0..15).\r
+ * @param GPIO_AFSelection: selects the pin to used as Alternat function.\r
+ * This parameter can be one of the following values:\r
+ * @arg GPIO_AF_RTC_50Hz: RTC 50/60 Hz synchronization\r
+ * @arg GPIO_AF_MCO: Microcontroller clock output\r
+ * @arg GPIO_AF_RTC_AF1: Time stamp, Tamper, Alarm A out, Alarm B out,\r
+ * 512 Hz clock output (with an LSE oscillator of 32.768 kHz)\r
+ * @arg GPIO_AF_WKUP: wakeup\r
+ * @arg GPIO_AF_SWJ: SWJ (SW and JTAG)\r
+ * @arg GPIO_AF_TRACE\r
+ * @arg GPIO_AF_TIM2\r
+ * @arg GPIO_AF_TIM3\r
+ * @arg GPIO_AF_TIM4\r
+ * @arg GPIO_AF_TIM9\r
+ * @arg GPIO_AF_TIM10\r
+ * @arg GPIO_AF_TIM11\r
+ * @arg GPIO_AF_I2C1\r
+ * @arg GPIO_AF_I2C2\r
+ * @arg GPIO_AF_SPI1\r
+ * @arg GPIO_AF_SPI2\r
+ * @arg GPIO_AF_USART1\r
+ * @arg GPIO_AF_USART2\r
+ * @arg GPIO_AF_USART3\r
+ * @arg GPIO_AF_USB\r
+ * @arg GPIO_AF_LCD\r
+ * @arg GPIO_AF_RI\r
+ * @arg GPIO_AF_EVENTOUT: Cortex-M3 EVENTOUT signal\r
+ * @note: The pin should already been configured in Alternate Function mode(AF)\r
+ * using GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF\r
+ * @note: Please refer to the Alternate function mapping table in the device \r
+ * datasheet for the detailed mapping of the system and peripherals\92\r
+ * alternate function I/O pins. \r
+ * @note: EVENTOUT is not mapped on PH0, PH1 and PH2. \r
+ * @retval None\r
+ */\r
+void GPIO_PinAFConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_PinSource, uint8_t GPIO_AF)\r
+{\r
+ uint32_t temp = 0x00;\r
+ uint32_t temp_2 = 0x00;\r
+ \r
+ /* Check the parameters */\r
+ assert_param(IS_GPIO_ALL_PERIPH(GPIOx));\r
+ assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));\r
+ assert_param(IS_GPIO_AF(GPIO_AF));\r
+ \r
+ temp = ((uint32_t)(GPIO_AF) << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;\r
+ GPIOx->AFR[GPIO_PinSource >> 0x03] &= ~((uint32_t)0xF << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;\r
+ temp_2 = GPIOx->AFR[GPIO_PinSource >> 0x03] | temp;\r
+ GPIOx->AFR[GPIO_PinSource >> 0x03] = temp_2;\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/**\r
+ * @}\r
+ */\r
+/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/\r
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