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  1. /**
  2.   ******************************************************************************
  3.   * @file    stm32f1xx_ll_i2c.c
  4.   * @author  MCD Application Team
  5.   * @brief   I2C LL module driver.
  6.   ******************************************************************************
  7.   * @attention
  8.   *
  9.   * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  10.   *
  11.   * Redistribution and use in source and binary forms, with or without modification,
  12.   * are permitted provided that the following conditions are met:
  13.   *   1. Redistributions of source code must retain the above copyright notice,
  14.   *      this list of conditions and the following disclaimer.
  15.   *   2. Redistributions in binary form must reproduce the above copyright notice,
  16.   *      this list of conditions and the following disclaimer in the documentation
  17.   *      and/or other materials provided with the distribution.
  18.   *   3. Neither the name of STMicroelectronics nor the names of its contributors
  19.   *      may be used to endorse or promote products derived from this software
  20.   *      without specific prior written permission.
  21.   *
  22.   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23.   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24.   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  25.   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  26.   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27.   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  28.   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  29.   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30.   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31.   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32.   *
  33.   ******************************************************************************
  34.   */
  35. #if defined(USE_FULL_LL_DRIVER)
  36.  
  37. /* Includes ------------------------------------------------------------------*/
  38. #include "stm32f1xx_ll_i2c.h"
  39. #include "stm32f1xx_ll_bus.h"
  40. #include "stm32f1xx_ll_rcc.h"
  41. #ifdef  USE_FULL_ASSERT
  42. #include "stm32_assert.h"
  43. #else
  44. #define assert_param(expr) ((void)0U)
  45. #endif
  46.  
  47. /** @addtogroup STM32F1xx_LL_Driver
  48.   * @{
  49.   */
  50.  
  51. #if defined (I2C1) || defined (I2C2)
  52.  
  53. /** @defgroup I2C_LL I2C
  54.   * @{
  55.   */
  56.  
  57. /* Private types -------------------------------------------------------------*/
  58. /* Private variables ---------------------------------------------------------*/
  59. /* Private constants ---------------------------------------------------------*/
  60. /* Private macros ------------------------------------------------------------*/
  61. /** @addtogroup I2C_LL_Private_Macros
  62.   * @{
  63.   */
  64.  
  65. #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__)    (((__VALUE__) == LL_I2C_MODE_I2C)          || \
  66.                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST)   || \
  67.                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
  68.                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
  69.  
  70. #define IS_LL_I2C_CLOCK_SPEED(__VALUE__)           (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST))
  71.  
  72. #define IS_LL_I2C_DUTY_CYCLE(__VALUE__)            (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \
  73.                                                  ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9))
  74.  
  75. #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__)       ((__VALUE__) <= 0x000003FFU)
  76.  
  77. #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__)   (((__VALUE__) == LL_I2C_ACK) || \
  78.                                                  ((__VALUE__) == LL_I2C_NACK))
  79.  
  80. #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__)       (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
  81.                                                  ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
  82. /**
  83.   * @}
  84.   */
  85.  
  86. /* Private function prototypes -----------------------------------------------*/
  87.  
  88. /* Exported functions --------------------------------------------------------*/
  89. /** @addtogroup I2C_LL_Exported_Functions
  90.   * @{
  91.   */
  92.  
  93. /** @addtogroup I2C_LL_EF_Init
  94.   * @{
  95.   */
  96.  
  97. /**
  98.   * @brief  De-initialize the I2C registers to their default reset values.
  99.   * @param  I2Cx I2C Instance.
  100.   * @retval An ErrorStatus enumeration value:
  101.   *          - SUCCESS  I2C registers are de-initialized
  102.   *          - ERROR  I2C registers are not de-initialized
  103.   */
  104. uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx)
  105. {
  106.   ErrorStatus status = SUCCESS;
  107.  
  108.   /* Check the I2C Instance I2Cx */
  109.   assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  110.  
  111.   if (I2Cx == I2C1)
  112.   {
  113.     /* Force reset of I2C clock */
  114.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
  115.  
  116.     /* Release reset of I2C clock */
  117.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
  118.   }
  119. #if defined(I2C2)
  120.   else if (I2Cx == I2C2)
  121.   {
  122.     /* Force reset of I2C clock */
  123.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
  124.  
  125.     /* Release reset of I2C clock */
  126.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
  127.  
  128.   }
  129. #endif /* I2C2 */
  130.   else
  131.   {
  132.     status = ERROR;
  133.   }
  134.  
  135.   return status;
  136. }
  137.  
  138. /**
  139.   * @brief  Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
  140.   * @param  I2Cx I2C Instance.
  141.   * @param  I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
  142.   * @retval An ErrorStatus enumeration value:
  143.   *          - SUCCESS  I2C registers are initialized
  144.   *          - ERROR  Not applicable
  145.   */
  146. uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
  147. {
  148.   LL_RCC_ClocksTypeDef rcc_clocks;
  149.  
  150.   /* Check the I2C Instance I2Cx */
  151.   assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  152.  
  153.   /* Check the I2C parameters from I2C_InitStruct */
  154.   assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
  155.   assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed));
  156.   assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle));
  157.   assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
  158.   assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
  159.   assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
  160.  
  161.   /* Disable the selected I2Cx Peripheral */
  162.   LL_I2C_Disable(I2Cx);
  163.  
  164.   /* Retrieve Clock frequencies */
  165.   LL_RCC_GetSystemClocksFreq(&rcc_clocks);
  166.  
  167.   /*---------------------------- I2Cx SCL Clock Speed Configuration ------------
  168.    * Configure the SCL speed :
  169.    * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS,
  170.    *           and I2C_CCR_CCR[11:0] bits
  171.    * - DutyCycle: I2C_CCR_DUTY[7:0] bits
  172.    */
  173.   LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle);
  174.  
  175.   /*---------------------------- I2Cx OAR1 Configuration -----------------------
  176.    * Disable, Configure and Enable I2Cx device own address 1 with parameters :
  177.    * - OwnAddress1:  I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits
  178.    * - OwnAddrSize:  I2C_OAR1_ADDMODE bit
  179.    */
  180.   LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
  181.  
  182.   /*---------------------------- I2Cx MODE Configuration -----------------------
  183.   * Configure I2Cx peripheral mode with parameter :
  184.    * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits
  185.    */
  186.   LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
  187.  
  188.   /* Enable the selected I2Cx Peripheral */
  189.   LL_I2C_Enable(I2Cx);
  190.  
  191.   /*---------------------------- I2Cx CR2 Configuration ------------------------
  192.    * Configure the ACKnowledge or Non ACKnowledge condition
  193.    * after the address receive match code or next received byte with parameter :
  194.    * - TypeAcknowledge: I2C_CR2_NACK bit
  195.    */
  196.   LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
  197.  
  198.   return SUCCESS;
  199. }
  200.  
  201. /**
  202.   * @brief  Set each @ref LL_I2C_InitTypeDef field to default value.
  203.   * @param  I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
  204.   * @retval None
  205.   */
  206. void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
  207. {
  208.   /* Set I2C_InitStruct fields to default values */
  209.   I2C_InitStruct->PeripheralMode  = LL_I2C_MODE_I2C;
  210.   I2C_InitStruct->ClockSpeed      = 5000U;
  211.   I2C_InitStruct->DutyCycle       = LL_I2C_DUTYCYCLE_2;
  212.   I2C_InitStruct->OwnAddress1     = 0U;
  213.   I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
  214.   I2C_InitStruct->OwnAddrSize     = LL_I2C_OWNADDRESS1_7BIT;
  215. }
  216.  
  217. /**
  218.   * @}
  219.   */
  220.  
  221. /**
  222.   * @}
  223.   */
  224.  
  225. /**
  226.   * @}
  227.   */
  228.  
  229. #endif /* I2C1 || I2C2 */
  230.  
  231. /**
  232.   * @}
  233.   */
  234.  
  235. #endif /* USE_FULL_LL_DRIVER */
  236.  
  237. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  238.