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