Rev 56 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 56 | mjames | 1 | /** |
| 2 | ****************************************************************************** |
||
| 3 | * @file stm32l1xx_ll_i2c.c |
||
| 4 | * @author MCD Application Team |
||
| 5 | * @brief I2C LL module driver. |
||
| 6 | ****************************************************************************** |
||
| 7 | * @attention |
||
| 8 | * |
||
| 9 | * <h2><center>© Copyright (c) 2016 STMicroelectronics. |
||
| 10 | * All rights reserved.</center></h2> |
||
| 11 | * |
||
| 12 | * This software component is licensed by ST under BSD 3-Clause license, |
||
| 13 | * the "License"; You may not use this file except in compliance with the |
||
| 14 | * License. You may obtain a copy of the License at: |
||
| 15 | * opensource.org/licenses/BSD-3-Clause |
||
| 16 | * |
||
| 17 | ****************************************************************************** |
||
| 18 | */ |
||
| 19 | #if defined(USE_FULL_LL_DRIVER) |
||
| 20 | |||
| 21 | /* Includes ------------------------------------------------------------------*/ |
||
| 22 | #include "stm32l1xx_ll_i2c.h" |
||
| 23 | #include "stm32l1xx_ll_bus.h" |
||
| 24 | #include "stm32l1xx_ll_rcc.h" |
||
| 25 | #ifdef USE_FULL_ASSERT |
||
| 26 | #include "stm32_assert.h" |
||
| 27 | #else |
||
| 28 | #define assert_param(expr) ((void)0U) |
||
| 29 | #endif |
||
| 30 | |||
| 31 | /** @addtogroup STM32L1xx_LL_Driver |
||
| 32 | * @{ |
||
| 33 | */ |
||
| 34 | |||
| 35 | #if defined (I2C1) || defined (I2C2) |
||
| 36 | |||
| 37 | /** @defgroup I2C_LL I2C |
||
| 38 | * @{ |
||
| 39 | */ |
||
| 40 | |||
| 41 | /* Private types -------------------------------------------------------------*/ |
||
| 42 | /* Private variables ---------------------------------------------------------*/ |
||
| 43 | /* Private constants ---------------------------------------------------------*/ |
||
| 44 | /* Private macros ------------------------------------------------------------*/ |
||
| 45 | /** @addtogroup I2C_LL_Private_Macros |
||
| 46 | * @{ |
||
| 47 | */ |
||
| 48 | |||
| 49 | #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__) (((__VALUE__) == LL_I2C_MODE_I2C) || \ |
||
| 50 | ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST) || \ |
||
| 51 | ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \ |
||
| 52 | ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP)) |
||
| 53 | |||
| 54 | #define IS_LL_I2C_CLOCK_SPEED(__VALUE__) (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST)) |
||
| 55 | |||
| 56 | #define IS_LL_I2C_DUTY_CYCLE(__VALUE__) (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \ |
||
| 57 | ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9)) |
||
| 58 | |||
| 59 | #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU) |
||
| 60 | |||
| 61 | #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \ |
||
| 62 | ((__VALUE__) == LL_I2C_NACK)) |
||
| 63 | |||
| 64 | #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \ |
||
| 65 | ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT)) |
||
| 66 | /** |
||
| 67 | * @} |
||
| 68 | */ |
||
| 69 | |||
| 70 | /* Private function prototypes -----------------------------------------------*/ |
||
| 71 | |||
| 72 | /* Exported functions --------------------------------------------------------*/ |
||
| 73 | /** @addtogroup I2C_LL_Exported_Functions |
||
| 74 | * @{ |
||
| 75 | */ |
||
| 76 | |||
| 77 | /** @addtogroup I2C_LL_EF_Init |
||
| 78 | * @{ |
||
| 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 | |||
| 92 | /* Check the I2C Instance I2Cx */ |
||
| 93 | assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
||
| 94 | |||
| 95 | if (I2Cx == I2C1) |
||
| 96 | { |
||
| 97 | /* Force reset of I2C clock */ |
||
| 98 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1); |
||
| 99 | |||
| 100 | /* Release reset of I2C clock */ |
||
| 101 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1); |
||
| 102 | } |
||
| 103 | else if (I2Cx == I2C2) |
||
| 104 | { |
||
| 105 | /* Force reset of I2C clock */ |
||
| 106 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2); |
||
| 107 | |||
| 108 | /* Release reset of I2C clock */ |
||
| 109 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2); |
||
| 110 | |||
| 111 | } |
||
| 112 | else |
||
| 113 | { |
||
| 114 | status = ERROR; |
||
| 115 | } |
||
| 116 | |||
| 117 | return status; |
||
| 118 | } |
||
| 119 | |||
| 120 | /** |
||
| 121 | * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct. |
||
| 122 | * @param I2Cx I2C Instance. |
||
| 123 | * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure. |
||
| 124 | * @retval An ErrorStatus enumeration value: |
||
| 125 | * - SUCCESS I2C registers are initialized |
||
| 126 | * - ERROR Not applicable |
||
| 127 | */ |
||
| 128 | uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct) |
||
| 129 | { |
||
| 130 | LL_RCC_ClocksTypeDef rcc_clocks; |
||
| 131 | |||
| 132 | /* Check the I2C Instance I2Cx */ |
||
| 133 | assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
||
| 134 | |||
| 135 | /* Check the I2C parameters from I2C_InitStruct */ |
||
| 136 | assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode)); |
||
| 137 | assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed)); |
||
| 138 | assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle)); |
||
| 139 | assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1)); |
||
| 140 | assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge)); |
||
| 141 | assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize)); |
||
| 142 | |||
| 143 | /* Disable the selected I2Cx Peripheral */ |
||
| 144 | LL_I2C_Disable(I2Cx); |
||
| 145 | |||
| 146 | /* Retrieve Clock frequencies */ |
||
| 147 | LL_RCC_GetSystemClocksFreq(&rcc_clocks); |
||
| 148 | |||
| 149 | /*---------------------------- I2Cx SCL Clock Speed Configuration ------------ |
||
| 150 | * Configure the SCL speed : |
||
| 151 | * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS, |
||
| 152 | * and I2C_CCR_CCR[11:0] bits |
||
| 153 | * - DutyCycle: I2C_CCR_DUTY[7:0] bits |
||
| 154 | */ |
||
| 155 | LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle); |
||
| 156 | |||
| 157 | /*---------------------------- I2Cx OAR1 Configuration ----------------------- |
||
| 158 | * Disable, Configure and Enable I2Cx device own address 1 with parameters : |
||
| 159 | * - OwnAddress1: I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits |
||
| 160 | * - OwnAddrSize: I2C_OAR1_ADDMODE bit |
||
| 161 | */ |
||
| 162 | LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize); |
||
| 163 | |||
| 164 | /*---------------------------- I2Cx MODE Configuration ----------------------- |
||
| 165 | * Configure I2Cx peripheral mode with parameter : |
||
| 166 | * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits |
||
| 167 | */ |
||
| 168 | LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode); |
||
| 169 | |||
| 170 | /* Enable the selected I2Cx Peripheral */ |
||
| 171 | LL_I2C_Enable(I2Cx); |
||
| 172 | |||
| 173 | /*---------------------------- I2Cx CR2 Configuration ------------------------ |
||
| 174 | * Configure the ACKnowledge or Non ACKnowledge condition |
||
| 175 | * after the address receive match code or next received byte with parameter : |
||
| 176 | * - TypeAcknowledge: I2C_CR2_NACK bit |
||
| 177 | */ |
||
| 178 | LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge); |
||
| 179 | |||
| 180 | return SUCCESS; |
||
| 181 | } |
||
| 182 | |||
| 183 | /** |
||
| 184 | * @brief Set each @ref LL_I2C_InitTypeDef field to default value. |
||
| 185 | * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure. |
||
| 186 | * @retval None |
||
| 187 | */ |
||
| 188 | void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct) |
||
| 189 | { |
||
| 190 | /* Set I2C_InitStruct fields to default values */ |
||
| 191 | I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C; |
||
| 192 | I2C_InitStruct->ClockSpeed = 5000U; |
||
| 193 | I2C_InitStruct->DutyCycle = LL_I2C_DUTYCYCLE_2; |
||
| 194 | I2C_InitStruct->OwnAddress1 = 0U; |
||
| 195 | I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK; |
||
| 196 | I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT; |
||
| 197 | } |
||
| 198 | |||
| 199 | /** |
||
| 200 | * @} |
||
| 201 | */ |
||
| 202 | |||
| 203 | /** |
||
| 204 | * @} |
||
| 205 | */ |
||
| 206 | |||
| 207 | /** |
||
| 208 | * @} |
||
| 209 | */ |
||
| 210 | |||
| 211 | #endif /* I2C1 || I2C2 */ |
||
| 212 | |||
| 213 | /** |
||
| 214 | * @} |
||
| 215 | */ |
||
| 216 | |||
| 217 | #endif /* USE_FULL_LL_DRIVER */ |
||
| 218 | |||
| 219 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |