ref: 6f14d3a3a15f85c47b1b146c5b82c21f015a4536
dir: /demos/stm32f429_disco/stm/stm32f4_spl/src/stm32f4xx_gpio.c/
/**
******************************************************************************
* @file stm32f4xx_gpio.c
* @author MCD Application Team
* @version V1.3.0
* @date 08-November-2013
* @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 the following function
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOx, ENABLE);
(#) 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: 2 MHz, 25 MHz, 50 MHz or 100 MHz.
(++) 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 or DAC
output.
(#) Peripherals alternate function:
(++) For ADC and DAC, 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
*
* <h2><center>© COPYRIGHT 2013 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
/** @addtogroup STM32F4xx_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 De-initializes the GPIOx peripheral registers to their default reset values.
* @note By default, The GPIO pins are configured in input floating mode (except JTAG pins).
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @retval None
*/
void GPIO_DeInit(GPIO_TypeDef* GPIOx)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
if (GPIOx == GPIOA)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, DISABLE);
}
else if (GPIOx == GPIOB)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOB, DISABLE);
}
else if (GPIOx == GPIOC)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOC, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOC, DISABLE);
}
else if (GPIOx == GPIOD)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOD, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOD, DISABLE);
}
else if (GPIOx == GPIOE)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOE, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOE, DISABLE);
}
else if (GPIOx == GPIOF)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOF, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOF, DISABLE);
}
else if (GPIOx == GPIOG)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOG, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOG, DISABLE);
}
else if (GPIOx == GPIOH)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOH, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOH, DISABLE);
}
else if (GPIOx == GPIOI)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOI, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOI, DISABLE);
}
else if (GPIOx == GPIOJ)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOJ, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOJ, DISABLE);
}
else
{
if (GPIOx == GPIOK)
{
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOK, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOK, DISABLE);
}
}
}
/**
* @brief Initializes the GPIOx peripheral according to the specified parameters in the GPIO_InitStruct.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @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));
GPIOx->MODER |= (((uint32_t)GPIO_InitStruct->GPIO_Mode) << (pinpos * 2));
if ((GPIO_InitStruct->GPIO_Mode == GPIO_Mode_OUT) || (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_AF))
{
/* Check Speed mode parameters */
assert_param(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));
/* Speed mode configuration */
GPIOx->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEEDR0 << (pinpos * 2));
GPIOx->OSPEEDR |= ((uint32_t)(GPIO_InitStruct->GPIO_Speed) << (pinpos * 2));
/* Check Output mode parameters */
assert_param(IS_GPIO_OTYPE(GPIO_InitStruct->GPIO_OType));
/* Output mode configuration*/
GPIOx->OTYPER &= ~((GPIO_OTYPER_OT_0) << ((uint16_t)pinpos)) ;
GPIOx->OTYPER |= (uint16_t)(((uint16_t)GPIO_InitStruct->GPIO_OType) << ((uint16_t)pinpos));
}
/* Pull-up Pull down resistor configuration*/
GPIOx->PUPDR &= ~(GPIO_PUPDR_PUPDR0 << ((uint16_t)pinpos * 2));
GPIOx->PUPDR |= (((uint32_t)GPIO_InitStruct->GPIO_PuPd) << (pinpos * 2));
}
}
}
/**
* @brief Fills each GPIO_InitStruct member with its default value.
* @param GPIO_InitStruct : pointer to a GPIO_InitTypeDef structure which will be initialized.
* @retval None
*/
void GPIO_StructInit(GPIO_InitTypeDef* GPIO_InitStruct)
{
/* Reset GPIO init structure parameters values */
GPIO_InitStruct->GPIO_Pin = GPIO_Pin_All;
GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct->GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStruct->GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct->GPIO_PuPd = GPIO_PuPd_NOPULL;
}
/**
* @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..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx 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).
* @retval None
*/
void GPIO_PinLockConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
__IO uint32_t tmp = 0x00010000;
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GPIO_PIN(GPIO_Pin));
tmp |= GPIO_Pin;
/* Set LCKK bit */
GPIOx->LCKR = tmp;
/* Reset LCKK bit */
GPIOx->LCKR = GPIO_Pin;
/* Set LCKK bit */
GPIOx->LCKR = tmp;
/* Read LCKK bit*/
tmp = GPIOx->LCKR;
/* Read LCKK bit*/
tmp = GPIOx->LCKR;
}
/**
* @}
*/
/** @defgroup GPIO_Group2 GPIO Read and Write
* @brief GPIO Read and Write
*
@verbatim
===============================================================================
##### GPIO Read and Write #####
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Reads the specified input port pin.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @param GPIO_Pin: specifies the port bit to read.
* This parameter can be GPIO_Pin_x where x can be (0..15).
* @retval The input port pin value.
*/
uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
uint8_t bitstatus = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)Bit_RESET)
{
bitstatus = (uint8_t)Bit_SET;
}
else
{
bitstatus = (uint8_t)Bit_RESET;
}
return bitstatus;
}
/**
* @brief Reads the specified GPIO input data port.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @retval GPIO input data port value.
*/
uint16_t GPIO_ReadInputData(GPIO_TypeDef* GPIOx)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
return ((uint16_t)GPIOx->IDR);
}
/**
* @brief Reads the specified output data port bit.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @param GPIO_Pin: specifies the port bit to read.
* This parameter can be GPIO_Pin_x where x can be (0..15).
* @retval The output port pin value.
*/
uint8_t GPIO_ReadOutputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
uint8_t bitstatus = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
if (((GPIOx->ODR) & GPIO_Pin) != (uint32_t)Bit_RESET)
{
bitstatus = (uint8_t)Bit_SET;
}
else
{
bitstatus = (uint8_t)Bit_RESET;
}
return bitstatus;
}
/**
* @brief Reads the specified GPIO output data port.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @retval GPIO output data port value.
*/
uint16_t GPIO_ReadOutputData(GPIO_TypeDef* GPIOx)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
return ((uint16_t)GPIOx->ODR);
}
/**
* @brief Sets the selected data port bits.
* @note This functions 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..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @param GPIO_Pin: specifies the port bits to be written.
* This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
* @retval None
*/
void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GPIO_PIN(GPIO_Pin));
GPIOx->BSRRL = GPIO_Pin;
}
/**
* @brief Clears the selected data port bits.
* @note This functions 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..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @param GPIO_Pin: specifies the port bits to be written.
* This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
* @retval None
*/
void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GPIO_PIN(GPIO_Pin));
GPIOx->BSRRH = GPIO_Pin;
}
/**
* @brief Sets or clears the selected data port bit.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx 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).
* @param BitVal: specifies the value to be written to the selected bit.
* This parameter can be one of the BitAction enum values:
* @arg Bit_RESET: to clear the port pin
* @arg Bit_SET: to set the port pin
* @retval None
*/
void GPIO_WriteBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin, BitAction BitVal)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
assert_param(IS_GPIO_BIT_ACTION(BitVal));
if (BitVal != Bit_RESET)
{
GPIOx->BSRRL = GPIO_Pin;
}
else
{
GPIOx->BSRRH = GPIO_Pin ;
}
}
/**
* @brief Writes data to the specified GPIO data port.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @param PortVal: specifies the value to be written to the port output data register.
* @retval None
*/
void GPIO_Write(GPIO_TypeDef* GPIOx, uint16_t PortVal)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
GPIOx->ODR = PortVal;
}
/**
* @brief Toggles the specified GPIO pins..
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @param GPIO_Pin: Specifies the pins to be toggled.
* @retval None
*/
void GPIO_ToggleBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
GPIOx->ODR ^= GPIO_Pin;
}
/**
* @}
*/
/** @defgroup GPIO_Group3 GPIO Alternate functions configuration function
* @brief GPIO Alternate functions configuration function
*
@verbatim
===============================================================================
##### GPIO Alternate functions configuration function #####
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Changes the mapping of the specified pin.
* @param GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
* x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
* x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
* @param GPIO_PinSource: specifies the pin for the Alternate function.
* This parameter can be GPIO_PinSourcex where x can be (0..15).
* @param GPIO_AFSelection: selects the pin to used as Alternate function.
* This parameter can be one of the following values:
* @arg GPIO_AF_RTC_50Hz: Connect RTC_50Hz pin to AF0 (default after reset)
* @arg GPIO_AF_MCO: Connect MCO pin (MCO1 and MCO2) to AF0 (default after reset)
* @arg GPIO_AF_TAMPER: Connect TAMPER pins (TAMPER_1 and TAMPER_2) to AF0 (default after reset)
* @arg GPIO_AF_SWJ: Connect SWJ pins (SWD and JTAG)to AF0 (default after reset)
* @arg GPIO_AF_TRACE: Connect TRACE pins to AF0 (default after reset)
* @arg GPIO_AF_TIM1: Connect TIM1 pins to AF1
* @arg GPIO_AF_TIM2: Connect TIM2 pins to AF1
* @arg GPIO_AF_TIM3: Connect TIM3 pins to AF2
* @arg GPIO_AF_TIM4: Connect TIM4 pins to AF2
* @arg GPIO_AF_TIM5: Connect TIM5 pins to AF2
* @arg GPIO_AF_TIM8: Connect TIM8 pins to AF3
* @arg GPIO_AF_TIM9: Connect TIM9 pins to AF3
* @arg GPIO_AF_TIM10: Connect TIM10 pins to AF3
* @arg GPIO_AF_TIM11: Connect TIM11 pins to AF3
* @arg GPIO_AF_I2C1: Connect I2C1 pins to AF4
* @arg GPIO_AF_I2C2: Connect I2C2 pins to AF4
* @arg GPIO_AF_I2C3: Connect I2C3 pins to AF4
* @arg GPIO_AF_SPI1: Connect SPI1 pins to AF5
* @arg GPIO_AF_SPI2: Connect SPI2/I2S2 pins to AF5
* @arg GPIO_AF_SPI4: Connect SPI4 pins to AF5
* @arg GPIO_AF_SPI5: Connect SPI5 pins to AF5
* @arg GPIO_AF_SPI6: Connect SPI6 pins to AF5
* @arg GPIO_AF_SAI1: Connect SAI1 pins to AF6 for STM32F42xxx/43xxx devices.
* @arg GPIO_AF_SPI3: Connect SPI3/I2S3 pins to AF6
* @arg GPIO_AF_I2S3ext: Connect I2S3ext pins to AF7
* @arg GPIO_AF_USART1: Connect USART1 pins to AF7
* @arg GPIO_AF_USART2: Connect USART2 pins to AF7
* @arg GPIO_AF_USART3: Connect USART3 pins to AF7
* @arg GPIO_AF_UART4: Connect UART4 pins to AF8
* @arg GPIO_AF_UART5: Connect UART5 pins to AF8
* @arg GPIO_AF_USART6: Connect USART6 pins to AF8
* @arg GPIO_AF_UART7: Connect UART7 pins to AF8
* @arg GPIO_AF_UART8: Connect UART8 pins to AF8
* @arg GPIO_AF_CAN1: Connect CAN1 pins to AF9
* @arg GPIO_AF_CAN2: Connect CAN2 pins to AF9
* @arg GPIO_AF_TIM12: Connect TIM12 pins to AF9
* @arg GPIO_AF_TIM13: Connect TIM13 pins to AF9
* @arg GPIO_AF_TIM14: Connect TIM14 pins to AF9
* @arg GPIO_AF_OTG_FS: Connect OTG_FS pins to AF10
* @arg GPIO_AF_OTG_HS: Connect OTG_HS pins to AF10
* @arg GPIO_AF_ETH: Connect ETHERNET pins to AF11
* @arg GPIO_AF_FSMC: Connect FSMC pins to AF12
* @arg GPIO_AF_FMC: Connect FMC pins to AF12 for STM32F42xxx/43xxx devices.
* @arg GPIO_AF_OTG_HS_FS: Connect OTG HS (configured in FS) pins to AF12
* @arg GPIO_AF_SDIO: Connect SDIO pins to AF12
* @arg GPIO_AF_DCMI: Connect DCMI pins to AF13
* @arg GPIO_AF_LTDC: Connect LTDC pins to AF14 for STM32F429xx/439xx devices.
* @arg GPIO_AF_EVENTOUT: Connect EVENTOUT pins to AF15
* @retval None
*/
void GPIO_PinAFConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_PinSource, uint8_t GPIO_AF)
{
uint32_t temp = 0x00;
uint32_t temp_2 = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));
assert_param(IS_GPIO_AF(GPIO_AF));
temp = ((uint32_t)(GPIO_AF) << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;
GPIOx->AFR[GPIO_PinSource >> 0x03] &= ~((uint32_t)0xF << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;
temp_2 = GPIOx->AFR[GPIO_PinSource >> 0x03] | temp;
GPIOx->AFR[GPIO_PinSource >> 0x03] = temp_2;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/