| /** |
| ****************************************************************************** |
| * @file stm32f2xx_ll_i2c.c |
| * @author MCD Application Team |
| * @brief I2C LL module driver. |
| ****************************************************************************** |
| * @attention |
| * |
| * Copyright (c) 2016 STMicroelectronics. |
| * All rights reserved. |
| * |
| * This software is licensed under terms that can be found in the LICENSE file |
| * in the root directory of this software component. |
| * If no LICENSE file comes with this software, it is provided AS-IS. |
| * |
| ****************************************************************************** |
| */ |
| #if defined(USE_FULL_LL_DRIVER) |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32f2xx_ll_i2c.h" |
| #include "stm32f2xx_ll_bus.h" |
| #include "stm32f2xx_ll_rcc.h" |
| #ifdef USE_FULL_ASSERT |
| #include "stm32_assert.h" |
| #else |
| #define assert_param(expr) ((void)0U) |
| #endif |
| |
| /** @addtogroup STM32F2xx_LL_Driver |
| * @{ |
| */ |
| |
| #if defined (I2C1) || defined (I2C2) || defined (I2C3) |
| |
| /** @defgroup I2C_LL I2C |
| * @{ |
| */ |
| |
| /* Private types -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| /* Private constants ---------------------------------------------------------*/ |
| /* Private macros ------------------------------------------------------------*/ |
| /** @addtogroup I2C_LL_Private_Macros |
| * @{ |
| */ |
| |
| #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__) (((__VALUE__) == LL_I2C_MODE_I2C) || \ |
| ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST) || \ |
| ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \ |
| ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP)) |
| |
| #define IS_LL_I2C_CLOCK_SPEED(__VALUE__) (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST)) |
| |
| #define IS_LL_I2C_DUTY_CYCLE(__VALUE__) (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \ |
| ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9)) |
| |
| #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU) |
| |
| #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \ |
| ((__VALUE__) == LL_I2C_NACK)) |
| |
| #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \ |
| ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT)) |
| /** |
| * @} |
| */ |
| |
| /* Private function prototypes -----------------------------------------------*/ |
| |
| /* Exported functions --------------------------------------------------------*/ |
| /** @addtogroup I2C_LL_Exported_Functions |
| * @{ |
| */ |
| |
| /** @addtogroup I2C_LL_EF_Init |
| * @{ |
| */ |
| |
| /** |
| * @brief De-initialize the I2C registers to their default reset values. |
| * @param I2Cx I2C Instance. |
| * @retval An ErrorStatus enumeration value: |
| * - SUCCESS I2C registers are de-initialized |
| * - ERROR I2C registers are not de-initialized |
| */ |
| uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx) |
| { |
| ErrorStatus status = SUCCESS; |
| |
| /* Check the I2C Instance I2Cx */ |
| assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
| |
| if (I2Cx == I2C1) |
| { |
| /* Force reset of I2C clock */ |
| LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1); |
| |
| /* Release reset of I2C clock */ |
| LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1); |
| } |
| else if (I2Cx == I2C2) |
| { |
| /* Force reset of I2C clock */ |
| LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2); |
| |
| /* Release reset of I2C clock */ |
| LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2); |
| |
| } |
| else if (I2Cx == I2C3) |
| { |
| /* Force reset of I2C clock */ |
| LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3); |
| |
| /* Release reset of I2C clock */ |
| LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3); |
| } |
| else |
| { |
| status = ERROR; |
| } |
| |
| return status; |
| } |
| |
| /** |
| * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct. |
| * @param I2Cx I2C Instance. |
| * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure. |
| * @retval An ErrorStatus enumeration value: |
| * - SUCCESS I2C registers are initialized |
| * - ERROR Not applicable |
| */ |
| uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct) |
| { |
| LL_RCC_ClocksTypeDef rcc_clocks; |
| |
| /* Check the I2C Instance I2Cx */ |
| assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
| |
| /* Check the I2C parameters from I2C_InitStruct */ |
| assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode)); |
| assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed)); |
| assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle)); |
| assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1)); |
| assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge)); |
| assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize)); |
| |
| /* Disable the selected I2Cx Peripheral */ |
| LL_I2C_Disable(I2Cx); |
| |
| /* Retrieve Clock frequencies */ |
| LL_RCC_GetSystemClocksFreq(&rcc_clocks); |
| |
| /*---------------------------- I2Cx SCL Clock Speed Configuration ------------ |
| * Configure the SCL speed : |
| * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS, |
| * and I2C_CCR_CCR[11:0] bits |
| * - DutyCycle: I2C_CCR_DUTY[7:0] bits |
| */ |
| LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle); |
| |
| /*---------------------------- I2Cx OAR1 Configuration ----------------------- |
| * Disable, Configure and Enable I2Cx device own address 1 with parameters : |
| * - OwnAddress1: I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits |
| * - OwnAddrSize: I2C_OAR1_ADDMODE bit |
| */ |
| LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize); |
| |
| /*---------------------------- I2Cx MODE Configuration ----------------------- |
| * Configure I2Cx peripheral mode with parameter : |
| * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits |
| */ |
| LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode); |
| |
| /* Enable the selected I2Cx Peripheral */ |
| LL_I2C_Enable(I2Cx); |
| |
| /*---------------------------- I2Cx CR2 Configuration ------------------------ |
| * Configure the ACKnowledge or Non ACKnowledge condition |
| * after the address receive match code or next received byte with parameter : |
| * - TypeAcknowledge: I2C_CR2_NACK bit |
| */ |
| LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge); |
| |
| return SUCCESS; |
| } |
| |
| /** |
| * @brief Set each @ref LL_I2C_InitTypeDef field to default value. |
| * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure. |
| * @retval None |
| */ |
| void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct) |
| { |
| /* Set I2C_InitStruct fields to default values */ |
| I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C; |
| I2C_InitStruct->ClockSpeed = 5000U; |
| I2C_InitStruct->DutyCycle = LL_I2C_DUTYCYCLE_2; |
| I2C_InitStruct->OwnAddress1 = 0U; |
| I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK; |
| I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT; |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| #endif /* I2C1 || I2C2 || I2C3 */ |
| |
| /** |
| * @} |
| */ |
| |
| #endif /* USE_FULL_LL_DRIVER */ |