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  1. /**
  2.   ******************************************************************************
  3.   * @file    stm32l1xx_ll_i2c.c
  4.   * @author  MCD Application Team
  5.   * @brief   I2C LL module driver.
  6.   ******************************************************************************
  7.   * @attention
  8.   *
  9.   * Copyright (c) 2016 STMicroelectronics.
  10.   * All rights reserved.
  11.   *
  12.   * This software is licensed under terms that can be found in the LICENSE file
  13.   * in the root directory of this software component.
  14.   * If no LICENSE file comes with this software, it is provided AS-IS.
  15.   *
  16.   ******************************************************************************
  17.   */
  18. #if defined(USE_FULL_LL_DRIVER)
  19.  
  20. /* Includes ------------------------------------------------------------------*/
  21. #include "stm32l1xx_ll_i2c.h"
  22. #include "stm32l1xx_ll_bus.h"
  23. #include "stm32l1xx_ll_rcc.h"
  24. #ifdef  USE_FULL_ASSERT
  25. #include "stm32_assert.h"
  26. #else
  27. #define assert_param(expr) ((void)0U)
  28. #endif
  29.  
  30. /** @addtogroup STM32L1xx_LL_Driver
  31.   * @{
  32.   */
  33.  
  34. #if defined (I2C1) || defined (I2C2)
  35.  
  36. /** @defgroup I2C_LL I2C
  37.   * @{
  38.   */
  39.  
  40. /* Private types -------------------------------------------------------------*/
  41. /* Private variables ---------------------------------------------------------*/
  42. /* Private constants ---------------------------------------------------------*/
  43. /* Private macros ------------------------------------------------------------*/
  44. /** @addtogroup I2C_LL_Private_Macros
  45.   * @{
  46.   */
  47.  
  48. #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__)    (((__VALUE__) == LL_I2C_MODE_I2C)          || \
  49.                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST)   || \
  50.                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
  51.                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
  52.  
  53. #define IS_LL_I2C_CLOCK_SPEED(__VALUE__)           (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST))
  54.  
  55. #define IS_LL_I2C_DUTY_CYCLE(__VALUE__)            (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \
  56.                                                  ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9))
  57.  
  58. #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__)       ((__VALUE__) <= 0x000003FFU)
  59.  
  60. #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__)   (((__VALUE__) == LL_I2C_ACK) || \
  61.                                                  ((__VALUE__) == LL_I2C_NACK))
  62.  
  63. #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__)       (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
  64.                                                  ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
  65. /**
  66.   * @}
  67.   */
  68.  
  69. /* Private function prototypes -----------------------------------------------*/
  70.  
  71. /* Exported functions --------------------------------------------------------*/
  72. /** @addtogroup I2C_LL_Exported_Functions
  73.   * @{
  74.   */
  75.  
  76. /** @addtogroup I2C_LL_EF_Init
  77.   * @{
  78.   */
  79.  
  80. /**
  81.   * @brief  De-initialize the I2C registers to their default reset values.
  82.   * @param  I2Cx I2C Instance.
  83.   * @retval An ErrorStatus enumeration value:
  84.   *          - SUCCESS  I2C registers are de-initialized
  85.   *          - ERROR  I2C registers are not de-initialized
  86.   */
  87. uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx)
  88. {
  89.   ErrorStatus status = SUCCESS;
  90.  
  91.   /* Check the I2C Instance I2Cx */
  92.   assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  93.  
  94.   if (I2Cx == I2C1)
  95.   {
  96.     /* Force reset of I2C clock */
  97.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
  98.  
  99.     /* Release reset of I2C clock */
  100.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
  101.   }
  102.   else if (I2Cx == I2C2)
  103.   {
  104.     /* Force reset of I2C clock */
  105.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
  106.  
  107.     /* Release reset of I2C clock */
  108.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
  109.  
  110.   }
  111.   else
  112.   {
  113.     status = ERROR;
  114.   }
  115.  
  116.   return status;
  117. }
  118.  
  119. /**
  120.   * @brief  Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
  121.   * @param  I2Cx I2C Instance.
  122.   * @param  I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
  123.   * @retval An ErrorStatus enumeration value:
  124.   *          - SUCCESS  I2C registers are initialized
  125.   *          - ERROR  Not applicable
  126.   */
  127. uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
  128. {
  129.   LL_RCC_ClocksTypeDef rcc_clocks;
  130.  
  131.   /* Check the I2C Instance I2Cx */
  132.   assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  133.  
  134.   /* Check the I2C parameters from I2C_InitStruct */
  135.   assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
  136.   assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed));
  137.   assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle));
  138.   assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
  139.   assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
  140.   assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
  141.  
  142.   /* Disable the selected I2Cx Peripheral */
  143.   LL_I2C_Disable(I2Cx);
  144.  
  145.   /* Retrieve Clock frequencies */
  146.   LL_RCC_GetSystemClocksFreq(&rcc_clocks);
  147.  
  148.   /*---------------------------- I2Cx SCL Clock Speed Configuration ------------
  149.    * Configure the SCL speed :
  150.    * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS,
  151.    *           and I2C_CCR_CCR[11:0] bits
  152.    * - DutyCycle: I2C_CCR_DUTY[7:0] bits
  153.    */
  154.   LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle);
  155.  
  156.   /*---------------------------- I2Cx OAR1 Configuration -----------------------
  157.    * Disable, Configure and Enable I2Cx device own address 1 with parameters :
  158.    * - OwnAddress1:  I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits
  159.    * - OwnAddrSize:  I2C_OAR1_ADDMODE bit
  160.    */
  161.   LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
  162.  
  163.   /*---------------------------- I2Cx MODE Configuration -----------------------
  164.   * Configure I2Cx peripheral mode with parameter :
  165.    * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits
  166.    */
  167.   LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
  168.  
  169.   /* Enable the selected I2Cx Peripheral */
  170.   LL_I2C_Enable(I2Cx);
  171.  
  172.   /*---------------------------- I2Cx CR2 Configuration ------------------------
  173.    * Configure the ACKnowledge or Non ACKnowledge condition
  174.    * after the address receive match code or next received byte with parameter :
  175.    * - TypeAcknowledge: I2C_CR2_NACK bit
  176.    */
  177.   LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
  178.  
  179.   return SUCCESS;
  180. }
  181.  
  182. /**
  183.   * @brief  Set each @ref LL_I2C_InitTypeDef field to default value.
  184.   * @param  I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
  185.   * @retval None
  186.   */
  187. void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
  188. {
  189.   /* Set I2C_InitStruct fields to default values */
  190.   I2C_InitStruct->PeripheralMode  = LL_I2C_MODE_I2C;
  191.   I2C_InitStruct->ClockSpeed      = 5000U;
  192.   I2C_InitStruct->DutyCycle       = LL_I2C_DUTYCYCLE_2;
  193.   I2C_InitStruct->OwnAddress1     = 0U;
  194.   I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
  195.   I2C_InitStruct->OwnAddrSize     = LL_I2C_OWNADDRESS1_7BIT;
  196. }
  197.  
  198. /**
  199.   * @}
  200.   */
  201.  
  202. /**
  203.   * @}
  204.   */
  205.  
  206. /**
  207.   * @}
  208.   */
  209.  
  210. #endif /* I2C1 || I2C2 */
  211.  
  212. /**
  213.   * @}
  214.   */
  215.  
  216. #endif /* USE_FULL_LL_DRIVER */
  217.  
  218.