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  1. /**
  2. ******************************************************************************
  3. * @file stm32f0xx_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. /* Includes ------------------------------------------------------------------*/
  37. #include "stm32f0xx_ll_i2c.h"
  38. #include "stm32f0xx_ll_bus.h"
  39. #ifdef USE_FULL_ASSERT
  40. #include "stm32_assert.h"
  41. #else
  42. #define assert_param(expr) ((void)0U)
  43. #endif
  44. /** @addtogroup STM32F0xx_LL_Driver
  45. * @{
  46. */
  47. #if defined (I2C1) || defined (I2C2)
  48. /** @defgroup I2C_LL I2C
  49. * @{
  50. */
  51. /* Private types -------------------------------------------------------------*/
  52. /* Private variables ---------------------------------------------------------*/
  53. /* Private constants ---------------------------------------------------------*/
  54. /* Private macros ------------------------------------------------------------*/
  55. /** @addtogroup I2C_LL_Private_Macros
  56. * @{
  57. */
  58. #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__) (((__VALUE__) == LL_I2C_MODE_I2C) || \
  59. ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST) || \
  60. ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
  61. ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
  62. #define IS_LL_I2C_ANALOG_FILTER(__VALUE__) (((__VALUE__) == LL_I2C_ANALOGFILTER_ENABLE) || \
  63. ((__VALUE__) == LL_I2C_ANALOGFILTER_DISABLE))
  64. #define IS_LL_I2C_DIGITAL_FILTER(__VALUE__) ((__VALUE__) <= 0x0000000FU)
  65. #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU)
  66. #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \
  67. ((__VALUE__) == LL_I2C_NACK))
  68. #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
  69. ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
  70. /**
  71. * @}
  72. */
  73. /* Private function prototypes -----------------------------------------------*/
  74. /* Exported functions --------------------------------------------------------*/
  75. /** @addtogroup I2C_LL_Exported_Functions
  76. * @{
  77. */
  78. /** @addtogroup I2C_LL_EF_Init
  79. * @{
  80. */
  81. /**
  82. * @brief De-initialize the I2C registers to their default reset values.
  83. * @param I2Cx I2C Instance.
  84. * @retval An ErrorStatus enumeration value:
  85. * - SUCCESS: I2C registers are de-initialized
  86. * - ERROR: I2C registers are not de-initialized
  87. */
  88. uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx)
  89. {
  90. ErrorStatus status = SUCCESS;
  91. /* Check the I2C Instance I2Cx */
  92. assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  93. if (I2Cx == I2C1)
  94. {
  95. /* Force reset of I2C clock */
  96. LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
  97. /* Release reset of I2C clock */
  98. LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
  99. }
  100. #if defined(I2C2)
  101. else if (I2Cx == I2C2)
  102. {
  103. /* Force reset of I2C clock */
  104. LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
  105. /* Release reset of I2C clock */
  106. LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
  107. }
  108. #endif
  109. else
  110. {
  111. status = ERROR;
  112. }
  113. return status;
  114. }
  115. /**
  116. * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
  117. * @param I2Cx I2C Instance.
  118. * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
  119. * @retval An ErrorStatus enumeration value:
  120. * - SUCCESS: I2C registers are initialized
  121. * - ERROR: Not applicable
  122. */
  123. uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
  124. {
  125. /* Check the I2C Instance I2Cx */
  126. assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  127. /* Check the I2C parameters from I2C_InitStruct */
  128. assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
  129. assert_param(IS_LL_I2C_ANALOG_FILTER(I2C_InitStruct->AnalogFilter));
  130. assert_param(IS_LL_I2C_DIGITAL_FILTER(I2C_InitStruct->DigitalFilter));
  131. assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
  132. assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
  133. assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
  134. /* Disable the selected I2Cx Peripheral */
  135. LL_I2C_Disable(I2Cx);
  136. /*---------------------------- I2Cx CR1 Configuration ------------------------
  137. * Configure the analog and digital noise filters with parameters :
  138. * - AnalogFilter: I2C_CR1_ANFOFF bit
  139. * - DigitalFilter: I2C_CR1_DNF[3:0] bits
  140. */
  141. LL_I2C_ConfigFilters(I2Cx, I2C_InitStruct->AnalogFilter, I2C_InitStruct->DigitalFilter);
  142. /*---------------------------- I2Cx TIMINGR Configuration --------------------
  143. * Configure the SDA setup, hold time and the SCL high, low period with parameter :
  144. * - Timing: I2C_TIMINGR_PRESC[3:0], I2C_TIMINGR_SCLDEL[3:0], I2C_TIMINGR_SDADEL[3:0],
  145. * I2C_TIMINGR_SCLH[7:0] and I2C_TIMINGR_SCLL[7:0] bits
  146. */
  147. LL_I2C_SetTiming(I2Cx, I2C_InitStruct->Timing);
  148. /* Enable the selected I2Cx Peripheral */
  149. LL_I2C_Enable(I2Cx);
  150. /*---------------------------- I2Cx OAR1 Configuration -----------------------
  151. * Disable, Configure and Enable I2Cx device own address 1 with parameters :
  152. * - OwnAddress1: I2C_OAR1_OA1[9:0] bits
  153. * - OwnAddrSize: I2C_OAR1_OA1MODE bit
  154. */
  155. LL_I2C_DisableOwnAddress1(I2Cx);
  156. LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
  157. /* OwnAdress1 == 0 is reserved for General Call address */
  158. if (I2C_InitStruct->OwnAddress1 != 0U)
  159. {
  160. LL_I2C_EnableOwnAddress1(I2Cx);
  161. }
  162. /*---------------------------- I2Cx MODE Configuration -----------------------
  163. * Configure I2Cx peripheral mode with parameter :
  164. * - PeripheralMode: I2C_CR1_SMBDEN and I2C_CR1_SMBHEN bits
  165. */
  166. LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
  167. /*---------------------------- I2Cx CR2 Configuration ------------------------
  168. * Configure the ACKnowledge or Non ACKnowledge condition
  169. * after the address receive match code or next received byte with parameter :
  170. * - TypeAcknowledge: I2C_CR2_NACK bit
  171. */
  172. LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
  173. return SUCCESS;
  174. }
  175. /**
  176. * @brief Set each @ref LL_I2C_InitTypeDef field to default value.
  177. * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
  178. * @retval None
  179. */
  180. void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
  181. {
  182. /* Set I2C_InitStruct fields to default values */
  183. I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C;
  184. I2C_InitStruct->Timing = 0U;
  185. I2C_InitStruct->AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE;
  186. I2C_InitStruct->DigitalFilter = 0U;
  187. I2C_InitStruct->OwnAddress1 = 0U;
  188. I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
  189. I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
  190. }
  191. /**
  192. * @}
  193. */
  194. /**
  195. * @}
  196. */
  197. /**
  198. * @}
  199. */
  200. #endif /* I2C1 || I2C2 */
  201. /**
  202. * @}
  203. */
  204. #endif /* USE_FULL_LL_DRIVER */
  205. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/