File content as of revision 106:ced8cbb51063:

/**
  ******************************************************************************
  * @file    stm32f0xx_syscfg.c
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    16-January-2014
  * @brief   This file provides firmware functions to manage the following 
  *          functionalities of the SYSCFG peripheral:
  *           + Remapping the memory mapped at 0x00000000  
  *           + Remapping the DMA channels
  *           + Enabling I2C fast mode plus driving capability for I2C pins   
  *           + Configuring the EXTI lines connection to the GPIO port
  *           + Configuring the CFGR2 features (Connecting some internal signal
  *             to the break input of TIM1)
  *   
  *  @verbatim
 ===============================================================================
                     ##### How to use this driver #####
 ===============================================================================
    [..] 
               The SYSCFG registers can be accessed only when the SYSCFG 
               interface APB clock is enabled.
               To enable SYSCFG APB clock use:
               RCC_APBPeriphClockCmd(RCC_APBPeriph_SYSCFG, ENABLE).
  *  @endverbatim
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
  *
  * 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 of STMicroelectronics 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 HOLDER 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.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx_syscfg.h"

/** @addtogroup STM32F0xx_StdPeriph_Driver
  * @{
  */

/** @defgroup SYSCFG 
  * @brief SYSCFG driver modules
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup SYSCFG_Private_Functions
  * @{
  */ 

/** @defgroup SYSCFG_Group1 SYSCFG Initialization and Configuration functions
 *  @brief   SYSCFG Initialization and Configuration functions 
 *
@verbatim
 ===============================================================================
        ##### SYSCFG Initialization and Configuration functions #####
 ===============================================================================

@endverbatim
  * @{
  */

/**
  * @brief  Deinitializes the SYSCFG registers to their default reset values.
  * @param  None
  * @retval None
  * @note   MEM_MODE bits are not affected by APB reset.
  * @note   MEM_MODE bits took the value from the user option bytes.
  * @note   CFGR2 register is not affected by APB reset.
  * @note   CLABBB configuration bits are locked when set.
  * @note   To unlock the configuration, perform a system reset.
  */
void SYSCFG_DeInit(void)
{
  /* Set SYSCFG_CFGR1 register to reset value without affecting MEM_MODE bits */
  SYSCFG->CFGR1 &= SYSCFG_CFGR1_MEM_MODE;
  /* Set EXTICRx registers to reset value */
  SYSCFG->EXTICR[0] = 0;
  SYSCFG->EXTICR[1] = 0;
  SYSCFG->EXTICR[2] = 0;
  SYSCFG->EXTICR[3] = 0;
  /* Set CFGR2 register to reset value: clear SRAM parity error flag */
  SYSCFG->CFGR2 |= (uint32_t) SYSCFG_CFGR2_SRAM_PE;
}

/**
  * @brief  Configures the memory mapping at address 0x00000000.
  * @param  SYSCFG_MemoryRemap: selects the memory remapping.
  *          This parameter can be one of the following values:
  *            @arg SYSCFG_MemoryRemap_Flash: Main Flash memory mapped at 0x00000000  
  *            @arg SYSCFG_MemoryRemap_SystemMemory: System Flash memory mapped at 0x00000000
  *            @arg SYSCFG_MemoryRemap_SRAM: Embedded SRAM mapped at 0x00000000
  * @retval None
  */
void SYSCFG_MemoryRemapConfig(uint32_t SYSCFG_MemoryRemap)
{
  uint32_t tmpctrl = 0;

  /* Check the parameter */
  assert_param(IS_SYSCFG_MEMORY_REMAP(SYSCFG_MemoryRemap));

  /* Get CFGR1 register value */
  tmpctrl = SYSCFG->CFGR1;

  /* Clear MEM_MODE bits */
  tmpctrl &= (uint32_t) (~SYSCFG_CFGR1_MEM_MODE);

  /* Set the new MEM_MODE bits value */
  tmpctrl |= (uint32_t) SYSCFG_MemoryRemap;

  /* Set CFGR1 register with the new memory remap configuration */
  SYSCFG->CFGR1 = tmpctrl;
}

/**
  * @brief  Configure the DMA channels remapping.
  * @param  SYSCFG_DMARemap: selects the DMA channels remap.
  *          This parameter can be one of the following values:
  *            @arg SYSCFG_DMARemap_TIM17: Remap TIM17 DMA requests from channel1 to channel2
  *            @arg SYSCFG_DMARemap_TIM16: Remap TIM16 DMA requests from channel3 to channel4
  *            @arg SYSCFG_DMARemap_USART1Rx: Remap USART1 Rx DMA requests from channel3 to channel5
  *            @arg SYSCFG_DMARemap_USART1Tx: Remap USART1 Tx DMA requests from channel2 to channel4
  *            @arg SYSCFG_DMARemap_ADC1: Remap ADC1 DMA requests from channel1 to channel2
  * @param  NewState: new state of the DMA channel remapping. 
  *         This parameter can be: ENABLE or DISABLE.
  * @note   When enabled, DMA channel of the selected peripheral is remapped
  * @note   When disabled, Default DMA channel is mapped to the selected peripheral
  * @note   By default TIM17 DMA requests is mapped to channel 1, 
  *         use SYSCFG_DMAChannelRemapConfig(SYSCFG_DMARemap_TIM17, Enable) to remap
  *         TIM17 DMA requests to channel 2 and use
  *         SYSCFG_DMAChannelRemapConfig(SYSCFG_DMARemap_TIM17, Disable) to map
  *         TIM17 DMA requests to channel 1 (default mapping)
  * @retval None
  */
void SYSCFG_DMAChannelRemapConfig(uint32_t SYSCFG_DMARemap, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SYSCFG_DMA_REMAP(SYSCFG_DMARemap));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Remap the DMA channel */
    SYSCFG->CFGR1 |= (uint32_t)SYSCFG_DMARemap;
  }
  else
  {
    /* use the default DMA channel mapping */
    SYSCFG->CFGR1 &= (uint32_t)(~SYSCFG_DMARemap);
  }
}

/**
  * @brief  Configure the I2C fast mode plus driving capability.
  * @param  SYSCFG_I2CFastModePlus: selects the pin.
  *          This parameter can be one of the following values:
  *            @arg SYSCFG_I2CFastModePlus_PB6: Configure fast mode plus driving capability for PB6
  *            @arg SYSCFG_I2CFastModePlus_PB7: Configure fast mode plus driving capability for PB7
  *            @arg SYSCFG_I2CFastModePlus_PB8: Configure fast mode plus driving capability for PB8
  *            @arg SYSCFG_I2CFastModePlus_PB9: Configure fast mode plus driving capability for PB9
  *            @arg SYSCFG_I2CFastModePlus_PA9: Configure fast mode plus driving capability for PA9 (only for STM32F031 and STM32F030 devices)
  *            @arg SYSCFG_I2CFastModePlus_PA10: Configure fast mode plus driving capability for PA10 (only for STM32F031 and STM32F030 devices)
  *            @arg SYSCFG_I2CFastModePlus_I2C1: Configure fast mode plus driving capability for PB10, PB11, PF6 and PF7(only for STM32F031 and STM32F030 devices)
  *            @arg SYSCFG_I2CFastModePlus_I2C2: Configure fast mode plus driving capability for I2C2 pins, available only for STM32F072 devices
  *                
  * @param  NewState: new state of the DMA channel remapping. 
  *         This parameter can be:  ENABLE or DISABLE.
  * @note   ENABLE: Enable fast mode plus driving capability for selected I2C pin
  * @note   DISABLE: Disable fast mode plus driving capability for selected I2C pin
  * @note  For I2C1, fast mode plus driving capability can be enabled on all selected
  *        I2C1 pins using SYSCFG_I2CFastModePlus_I2C1 parameter or independently
  *        on each one of the following pins PB6, PB7, PB8 and PB9.
  * @note  For remaing I2C1 pins (PA14, PA15...) fast mode plus driving capability
  *        can be enabled only by using SYSCFG_I2CFastModePlus_I2C1 parameter.
  * @note  For all I2C2 pins fast mode plus driving capability can be enabled
  *        only by using SYSCFG_I2CFastModePlus_I2C2 parameter.
  * @retval None
  */
void SYSCFG_I2CFastModePlusConfig(uint32_t SYSCFG_I2CFastModePlus, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SYSCFG_I2C_FMP(SYSCFG_I2CFastModePlus));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable fast mode plus driving capability for selected pin */
    SYSCFG->CFGR1 |= (uint32_t)SYSCFG_I2CFastModePlus;
  }
  else
  {
    /* Disable fast mode plus driving capability for selected pin */
    SYSCFG->CFGR1 &= (uint32_t)(~SYSCFG_I2CFastModePlus);
  }
}

/**
  * @brief  Selects the GPIO pin used as EXTI Line.
  * @param  EXTI_PortSourceGPIOx: selects the GPIO port to be used as source 
  *                               for EXTI lines where x can be (A, B, C, D, E or F).
  * @note   GPIOE is available only for STM32F072.
  * @note   GPIOD is not available for STM32F031.    
  * @param  EXTI_PinSourcex: specifies the EXTI line to be configured.
  * @note   This parameter can be EXTI_PinSourcex where x can be:
  *         For STM32F051 and STM32F030: (0..15) for GPIOA, GPIOB, GPIOC, (2) for GPIOD and (0..1, 4..7) for GIIOF.
  *         For STM32F072: (0..15) for GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, (0..10) for GPIOF.
  *         For STM32F031: (0..15) for GPIOA, GPIOB, (13..15) for GPIOC and (0..1, 6..7) for GPIOF.
  * @retval None
  */
void SYSCFG_EXTILineConfig(uint8_t EXTI_PortSourceGPIOx, uint8_t EXTI_PinSourcex)
{
  uint32_t tmp = 0x00;

  /* Check the parameters */
  assert_param(IS_EXTI_PORT_SOURCE(EXTI_PortSourceGPIOx));
  assert_param(IS_EXTI_PIN_SOURCE(EXTI_PinSourcex));
  
  tmp = ((uint32_t)0x0F) << (0x04 * (EXTI_PinSourcex & (uint8_t)0x03));
  SYSCFG->EXTICR[EXTI_PinSourcex >> 0x02] &= ~tmp;
  SYSCFG->EXTICR[EXTI_PinSourcex >> 0x02] |= (((uint32_t)EXTI_PortSourceGPIOx) << (0x04 * (EXTI_PinSourcex & (uint8_t)0x03)));
}

/**
  * @brief  Connect the selected parameter to the break input of TIM1.
  * @note   The selected configuration is locked and can be unlocked by system reset
  * @param  SYSCFG_Break: selects the configuration to be connected to break
  *         input of TIM1
  *          This parameter can be any combination of the following values:
  *            @arg SYSCFG_Break_PVD: Connects the PVD event to the Break Input of TIM1,, not avaailable for  STM32F030 devices.
  *            @arg SYSCFG_Break_SRAMParity: Connects the SRAM_PARITY error signal to the Break Input of TIM1 .
  *            @arg SYSCFG_Break_Lockup: Connects Lockup output of CortexM0 to the break input of TIM1.
  * @retval None
  */
void SYSCFG_BreakConfig(uint32_t SYSCFG_Break)
{
  /* Check the parameter */
  assert_param(IS_SYSCFG_LOCK_CONFIG(SYSCFG_Break));

  SYSCFG->CFGR2 |= (uint32_t) SYSCFG_Break;
}

/**
  * @brief  Checks whether the specified SYSCFG flag is set or not.
  * @param  SYSCFG_Flag: specifies the SYSCFG flag to check. 
  *          This parameter can be one of the following values:
  *            @arg SYSCFG_FLAG_PE: SRAM parity error flag.
  * @retval The new state of SYSCFG_Flag (SET or RESET).
  */
FlagStatus SYSCFG_GetFlagStatus(uint32_t SYSCFG_Flag)
{
  FlagStatus bitstatus = RESET;

  /* Check the parameter */
  assert_param(IS_SYSCFG_FLAG(SYSCFG_Flag));

  /* Check the status of the specified SPI flag */
  if ((SYSCFG->CFGR2 & SYSCFG_CFGR2_SRAM_PE) != (uint32_t)RESET)
  {
    /* SYSCFG_Flag is set */
    bitstatus = SET;
  }
  else
  {
    /* SYSCFG_Flag is reset */
    bitstatus = RESET;
  }
  /* Return the SYSCFG_Flag status */
  return  bitstatus;
}

/**
  * @brief  Clear the selected SYSCFG flag.
  * @param  SYSCFG_Flag: selects the flag to be cleared.
  *          This parameter can be any combination of the following values:
  *            @arg SYSCFG_FLAG_PE: SRAM parity error flag.
  * @retval None
  */
void SYSCFG_ClearFlag(uint32_t SYSCFG_Flag)
{
  /* Check the parameter */
  assert_param(IS_SYSCFG_FLAG(SYSCFG_Flag));

  SYSCFG->CFGR2 |= (uint32_t) SYSCFG_Flag;
}

/**
  * @}
  */

/**
  * @}
  */ 

/**
  * @}
  */ 

/**
  * @}
  */ 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/